| AUTOR | TYTUŁ | KATEGORIA | ABSTRAKT | SŁOWA KLUCZOWE | ROK | VOL | ISSUE | STRONY | DOI | TYTUŁ CZASOPISMA |
|---|---|---|---|---|---|---|---|---|---|---|
| Daniel Filipiak, Robert Szczepaniak, Tomasz Zahorski, Robert Bąbel, Sebastian Stabryn, Wit Stryczniewicz | Flow visualization over an airfoil with flight control surfaces in a water tunnel | Aerodynamics | This paper demonstrates the feasibility of using-a water tunnel for the visualisation of flow in airfoils with flight control systems in the form of slots and flaps. Furthermore, the issue of using water tunnels for scientific and training purposes was explained. The technology of 3D printed models for practical tests in a water tunnel was also presented. The experiment included conducting flow visualisation tests for three airfoil models: with the Clark Y 11.7% as the base airfoil and the same airfoil with a slot and a flap. Moreover, a modification to dye injection system was introduced. The presented results of flow visualisation around models with the use of dye, confirmed the effectiveness of the applied methodology. The results and conclusions may be utilized to verify most flow-related issues in hydrodynamic tunnels and can also be used as a training element. | water tunnel testing airfoil flaps slots | 2017 | 1 | 246 | 63-78 | 10.2478/TAR-2017-0007 | Transactions on Aerospace Research |
| Dawid Zadura | Importance of personal data protection law for commercial air transport | Air transportation | In the review below the author presents a general overview of the selected contemporary legal issues related to the present growth of the aviation industry and the development of aviation technologies. The review is focused on the questions at the intersection of aviation law and personal data protection law. Massive processing of passenger data (Passenger Name Record, PNR) in IT systems is a daily activity for the contemporary aviation industry. Simultaneously, since the mid- 1990s we can observe the rapid growth of personal data protection law as a very new branch of the law. The importance of this new branch of the law for the aviation industry is however still questionable and unclear. This article includes the summary of the author’s own research conducted between 2011 and 2017, in particular his audits in LOT Polish Airlines (June 2011-April 2013) and Lublin Airport (July - September 2013) and the author’s analyses of public information shared by International Civil Aviation Organization (ICAO), International Air Transport Association (IATA), Association of European Airlines (AEA), Civil Aviation Authority (ULC) and (GIODO). The purpose of the author’s research was to determine the applicability of the implementation of technical and organizational measures established by personal data protection law in aviation industry entities. | aviation industry aviation law aviation security | 2017 | 1 | 246 | 35-44 | 10.2478/TAR-2017-0004 | Transactions on Aerospace Research |
| Marcelina Bobrowska, Michał Barcikowski, Radosław Rybczyński | Research of Dependence of the Damage Area on Tow Width on Filament-Wound Composite Tubes | Aircraft structures | This paper explores the effect of tow width on the damage area produced by high velocity impacts on glass fiber/epoxy composite structures made by filament winding. The subject of the research were a four-layered composite tubes that have been designed using matrix method. The method was used to select mosaic patterns with different rest of the winding stroke and number of interlaces, which are places of stress concentration and which affect the strength of the composite. The narrowest (5 mm) and the widest (17 mm) tow width available was chosen. Composite filament-wound structures were subjected to a high velocity impact by a 2.0 g spherical hardened steel impactor propelled to a velocity of 140 ÷ 170 m/s using a gas gun. It was observed that dependence of the damage area on tow width on filament-wound composite tubes is possible. | Filament-wound composite structures impact damage ballistic impact filament winding | 2017 | 1 | 246 | 7-14 | 10.2478/TAR-2017-0001 | Transactions on Aerospace Research |
| Marcelina Bobrowska, Michał Barcikowski, Radosław Rybczyński | Research of Dependence of the Damage Area on Tow Width on Filament-Wound Composite Tubes | Aircraft structures | This paper explores the effect of tow width on the damage area produced by high velocity impacts on glass fiber/epoxy composite structures made by filament winding. The subject of the research were a four-layered composite tubes that have been designed using matrix method. The method was used to select mosaic patterns with different rest of the winding stroke and number of interlaces, which are places of stress concentration and which affect the strength of the composite. The narrowest (5 mm) and the widest (17 mm) tow width available was chosen. Composite filament-wound structures were subjected to a high velocity impact by a 2.0 g spherical hardened steel impactor propelled to a velocity of 140 ÷ 170 m/s using a gas gun. It was observed that dependence of the damage area on tow width on filament-wound composite tubes is possible. | Filament-wound composite structures impact damage ballistic impact filament winding | 2017 | 1 | 246 | 7-14 | 10.2478/TAR-2017-0001 | Transactions on Aerospace Research |
| Wiesław Krzymień | Mechanical properties of the package of ferromagnetic sheets | Aircraft structures | The paper presents the measurement method and results as well as the results of comparative calculations aimed at determination of material data for the package of ferromagnetic sheets insulated with epoxy lacquer. During the test, the package of sheets was treated as a 3D orthotropic material. The values of Young’s and Kirchhoff’s moduli for a pre-compressed package of sheets, in accordance with the used manufacturing technology of the medium and high power electric motors’ rotors, were detennined. The carried out FEM comparative calculations confirmed that the determined mechanical parameters of the package of sheets as a 3D orthotropic material, i.e. Young’s and Kirchhoff’s moduli, for the compressive stress range of 1.0÷2.5 MPa, are included in the linear range. It was assumed that the determined mechanical properties of the package of sheets are necessary at the design stage for FEM simulation calculations of the electric motors’ vibration and strength properties. As a result of the tests, it was found that they should be repeated in order to determine the properties of other sheets or those coated with different insulating lacquer. | asynchronous motor package of sheets FEM vibration | 2017 | 1 | 246 | 54-62 | 10.2478/TAR-2017-0006 | Transactions on Aerospace Research |
| Michał Sokołowski | Process of Preparing and Laying Carbon Prepregs | COMPOSITE MATERIALS | This article contains information on the technological process involved in the production of a composite structure with carbon-epoxy prepregs including critical parameters of the process. The information in the publication shows respectively: 1. Using composite components for constructing the airframe, 2. ways of storing and preserving carbon prepregs on a matrix of thermosetting resins, 3. specific types of varying weave fabrics used in the prepregs, 4. way of preparing material for the process, 5. cutting tools, 6. preparing swage, 7. list of the most popular materials, their characteristics, pros and cons of their applications, 8. issues related to types of release agent, 9. parameters of selecting release agents in the process of manufacturing structures with carbon prepregs, 10. process of laying plies in a layered structure, 11. defects which result from improper material laying in swage, 12. preparing the structure for heating and technical parameters of the process. | carbon prepreg composite material release agents swage | 2017 | 1 | 246 | 27-34 | 10.2478/TAR-2017-0003 | Transactions on Aerospace Research |
| Maciej Karny | The influence of the fastener hole preparation method on the fastener pull-through process in a carbon composite | COMPOSITE MATERIALS | This article studies the pull-through resistance of a titanium carbon fibre-epoxy resin laminate fastener. Coupons with fastener holes made with different methods were compared – drilled, milled on a CNC plotter and special fibre application during laminate production. The tests were conducted according to the ASTM D7332 test standard. The studies showed that the fastener hole preparation method impacts the laminate’s resistance to fastener pull-through. Coupons with holes made with standard (drilling and milling) methods showed fastener pull-through resistance higher, on average, by 6.5% than in coupons with holes placed during plate production. Fastener work to rupture was also higher for coupons with milled and drilled holes. Microscopic observations in UV-light, using a fluorescent penetrant, showed differences in failure mechanisms between individual coupons, especially the lack of fibres in the 0° direction, in immediate vicinity to a hole prepared during laminate application. | composites fastener pull-through ASTM D7332 standard drilling | 2017 | 1 | 246 | 45-53 | 10.2478/TAR-2017-0005 | Transactions on Aerospace Research |
| Rafał Szymański | Quality control process of manufactured composite structures | COMPOSITE MATERIALS | The paper includes a description of the composite material used in the aviation industry. It presents the technological development of composites in terms of their use in the most important elements of the aircraft structures, such as a spar and aircraft wing sheathing, which are subjected to high loads during operation. The type of the material implemented for production was listed and the most commonly occurred incompatibilities during the carbon pre-impregnate manufacture and transport were described. The manufacture diagram of composite elements with a polymer matrix was presented and the quality control system carried out at each mentioned stage (material storage, defrosting, cutting of dies, structure forming, polymerisation) was discussed. The methods of non-destructive tests of carbon laminates in a polymer matrix were also listed, describing the most effective of them, i.e. a method of ultrasonic tests. The conclusions were drawn and the development possibilities of ultrasonic tests both in terms of quality improvement and reduction of time for detecting incompatibilities in composite structures were described. | pre-impregnate composite technology non-destructive tests with the use of an ultrasonic method | 2017 | 1 | 246 | 95-103 | 10.2478/TAR-2017-0009 | Transactions on Aerospace Research |
| Marcelina Bobrowska, Michał Barcikowski, Radosław Rybczyński | Research of Dependence of the Damage Area on Tow Width on Filament-Wound Composite Tubes | COMPOSITE MATERIALS | This paper explores the effect of tow width on the damage area produced by high velocity impacts on glass fiber/epoxy composite structures made by filament winding. The subject of the research were a four-layered composite tubes that have been designed using matrix method. The method was used to select mosaic patterns with different rest of the winding stroke and number of interlaces, which are places of stress concentration and which affect the strength of the composite. The narrowest (5 mm) and the widest (17 mm) tow width available was chosen. Composite filament-wound structures were subjected to a high velocity impact by a 2.0 g spherical hardened steel impactor propelled to a velocity of 140 ÷ 170 m/s using a gas gun. It was observed that dependence of the damage area on tow width on filament-wound composite tubes is possible. | Filament-wound composite structures impact damage ballistic impact filament winding | 2017 | 1 | 246 | 7-14 | 10.2478/TAR-2017-0001 | Transactions on Aerospace Research |
| Michał Sokołowski | Process of Preparing and Laying Carbon Prepregs | COMPOSITE STRUCTURES | This article contains information on the technological process involved in the production of a composite structure with carbon-epoxy prepregs including critical parameters of the process. The information in the publication shows respectively: 1. Using composite components for constructing the airframe, 2. ways of storing and preserving carbon prepregs on a matrix of thermosetting resins, 3. specific types of varying weave fabrics used in the prepregs, 4. way of preparing material for the process, 5. cutting tools, 6. preparing swage, 7. list of the most popular materials, their characteristics, pros and cons of their applications, 8. issues related to types of release agent, 9. parameters of selecting release agents in the process of manufacturing structures with carbon prepregs, 10. process of laying plies in a layered structure, 11. defects which result from improper material laying in swage, 12. preparing the structure for heating and technical parameters of the process. | carbon prepreg composite material release agents swage | 2017 | 1 | 246 | 27-34 | 10.2478/TAR-2017-0003 | Transactions on Aerospace Research |
| Maciej Karny | The influence of the fastener hole preparation method on the fastener pull-through process in a carbon composite | COMPOSITE STRUCTURES | This article studies the pull-through resistance of a titanium carbon fibre-epoxy resin laminate fastener. Coupons with fastener holes made with different methods were compared – drilled, milled on a CNC plotter and special fibre application during laminate production. The tests were conducted according to the ASTM D7332 test standard. The studies showed that the fastener hole preparation method impacts the laminate’s resistance to fastener pull-through. Coupons with holes made with standard (drilling and milling) methods showed fastener pull-through resistance higher, on average, by 6.5% than in coupons with holes placed during plate production. Fastener work to rupture was also higher for coupons with milled and drilled holes. Microscopic observations in UV-light, using a fluorescent penetrant, showed differences in failure mechanisms between individual coupons, especially the lack of fibres in the 0° direction, in immediate vicinity to a hole prepared during laminate application. | composites fastener pull-through ASTM D7332 standard drilling | 2017 | 1 | 246 | 45-53 | 10.2478/TAR-2017-0005 | Transactions on Aerospace Research |
| Rafał Szymański | Quality control process of manufactured composite structures | COMPOSITE STRUCTURES | The paper includes a description of the composite material used in the aviation industry. It presents the technological development of composites in terms of their use in the most important elements of the aircraft structures, such as a spar and aircraft wing sheathing, which are subjected to high loads during operation. The type of the material implemented for production was listed and the most commonly occurred incompatibilities during the carbon pre-impregnate manufacture and transport were described. The manufacture diagram of composite elements with a polymer matrix was presented and the quality control system carried out at each mentioned stage (material storage, defrosting, cutting of dies, structure forming, polymerisation) was discussed. The methods of non-destructive tests of carbon laminates in a polymer matrix were also listed, describing the most effective of them, i.e. a method of ultrasonic tests. The conclusions were drawn and the development possibilities of ultrasonic tests both in terms of quality improvement and reduction of time for detecting incompatibilities in composite structures were described. | pre-impregnate composite technology non-destructive tests with the use of an ultrasonic method | 2017 | 1 | 246 | 95-103 | 10.2478/TAR-2017-0009 | Transactions on Aerospace Research |
| Michał Sokołowski | Process of Preparing and Laying Carbon Prepregs | COMPOSITES | This article contains information on the technological process involved in the production of a composite structure with carbon-epoxy prepregs including critical parameters of the process. The information in the publication shows respectively: 1. Using composite components for constructing the airframe, 2. ways of storing and preserving carbon prepregs on a matrix of thermosetting resins, 3. specific types of varying weave fabrics used in the prepregs, 4. way of preparing material for the process, 5. cutting tools, 6. preparing swage, 7. list of the most popular materials, their characteristics, pros and cons of their applications, 8. issues related to types of release agent, 9. parameters of selecting release agents in the process of manufacturing structures with carbon prepregs, 10. process of laying plies in a layered structure, 11. defects which result from improper material laying in swage, 12. preparing the structure for heating and technical parameters of the process. | carbon prepreg composite material release agents swage | 2017 | 1 | 246 | 27-34 | 10.2478/TAR-2017-0003 | Transactions on Aerospace Research |
| Maciej Karny | The influence of the fastener hole preparation method on the fastener pull-through process in a carbon composite | COMPOSITES | This article studies the pull-through resistance of a titanium carbon fibre-epoxy resin laminate fastener. Coupons with fastener holes made with different methods were compared – drilled, milled on a CNC plotter and special fibre application during laminate production. The tests were conducted according to the ASTM D7332 test standard. The studies showed that the fastener hole preparation method impacts the laminate’s resistance to fastener pull-through. Coupons with holes made with standard (drilling and milling) methods showed fastener pull-through resistance higher, on average, by 6.5% than in coupons with holes placed during plate production. Fastener work to rupture was also higher for coupons with milled and drilled holes. Microscopic observations in UV-light, using a fluorescent penetrant, showed differences in failure mechanisms between individual coupons, especially the lack of fibres in the 0° direction, in immediate vicinity to a hole prepared during laminate application. | composites fastener pull-through ASTM D7332 standard drilling | 2017 | 1 | 246 | 45-53 | 10.2478/TAR-2017-0005 | Transactions on Aerospace Research |
| Rafał Szymański | Quality control process of manufactured composite structures | COMPOSITES | The paper includes a description of the composite material used in the aviation industry. It presents the technological development of composites in terms of their use in the most important elements of the aircraft structures, such as a spar and aircraft wing sheathing, which are subjected to high loads during operation. The type of the material implemented for production was listed and the most commonly occurred incompatibilities during the carbon pre-impregnate manufacture and transport were described. The manufacture diagram of composite elements with a polymer matrix was presented and the quality control system carried out at each mentioned stage (material storage, defrosting, cutting of dies, structure forming, polymerisation) was discussed. The methods of non-destructive tests of carbon laminates in a polymer matrix were also listed, describing the most effective of them, i.e. a method of ultrasonic tests. The conclusions were drawn and the development possibilities of ultrasonic tests both in terms of quality improvement and reduction of time for detecting incompatibilities in composite structures were described. | pre-impregnate composite technology non-destructive tests with the use of an ultrasonic method | 2017 | 1 | 246 | 95-103 | 10.2478/TAR-2017-0009 | Transactions on Aerospace Research |
| Marcelina Bobrowska, Michał Barcikowski, Radosław Rybczyński | Research of Dependence of the Damage Area on Tow Width on Filament-Wound Composite Tubes | COMPOSITES | This paper explores the effect of tow width on the damage area produced by high velocity impacts on glass fiber/epoxy composite structures made by filament winding. The subject of the research were a four-layered composite tubes that have been designed using matrix method. The method was used to select mosaic patterns with different rest of the winding stroke and number of interlaces, which are places of stress concentration and which affect the strength of the composite. The narrowest (5 mm) and the widest (17 mm) tow width available was chosen. Composite filament-wound structures were subjected to a high velocity impact by a 2.0 g spherical hardened steel impactor propelled to a velocity of 140 ÷ 170 m/s using a gas gun. It was observed that dependence of the damage area on tow width on filament-wound composite tubes is possible. | Filament-wound composite structures impact damage ballistic impact filament winding | 2017 | 1 | 246 | 7-14 | 10.2478/TAR-2017-0001 | Transactions on Aerospace Research |
| Józef Krysztofik, Grzegorz Socha | Test of damage to Inconel 718 alloy used in aviation | Materials | Inconel 718 alloy was tested. A new type of specimens of variable cross-sectional area measuring part was used for the tests. This provided a continuous distribution of plastic strain in that part of the sample. The proposed method enables to replace a series of specimens by one specimen. The degradation of the material was obtained by static tensile test and the creep test. The permanent deformation that varies along the specimen axis allows for an analysis of damage induced by a plastic deformation. The degradation of the alloy corresponds with the changes of acoustics properties of the material - attenuation of ultrasonic waves. It allows to detennine the degree of damage to the material using a non-invasive - ultrasonic method. Using the damage parameter proposed by Johnson allows to obtain correlation between the non-destructive results and a damage degree of the material. The presented testing method delivers information about changes in the material structure caused by permanent deformation. | material degradation ultrasonic wave attenuation factor damage parameter non-destructive testing | 2017 | 1 | 246 | 104-116 | 10.2478/TAR-2017-0010 | Transactions on Aerospace Research |
| Wiesław Krzymień | Mechanical properties of the package of ferromagnetic sheets | Materials | The paper presents the measurement method and results as well as the results of comparative calculations aimed at determination of material data for the package of ferromagnetic sheets insulated with epoxy lacquer. During the test, the package of sheets was treated as a 3D orthotropic material. The values of Young’s and Kirchhoff’s moduli for a pre-compressed package of sheets, in accordance with the used manufacturing technology of the medium and high power electric motors’ rotors, were detennined. The carried out FEM comparative calculations confirmed that the determined mechanical parameters of the package of sheets as a 3D orthotropic material, i.e. Young’s and Kirchhoff’s moduli, for the compressive stress range of 1.0÷2.5 MPa, are included in the linear range. It was assumed that the determined mechanical properties of the package of sheets are necessary at the design stage for FEM simulation calculations of the electric motors’ vibration and strength properties. As a result of the tests, it was found that they should be repeated in order to determine the properties of other sheets or those coated with different insulating lacquer. | asynchronous motor package of sheets FEM vibration | 2017 | 1 | 246 | 54-62 | 10.2478/TAR-2017-0006 | Transactions on Aerospace Research |
| Joanna Hess | The Life Cycle of a Training Project in a Research and Development Unit | Researchers training | The article describes the life cycle of a training project in a research and development unit, from setting the training target, through analyzing the needs of the group, establishing workshops’ programs and logistics, up to the evaluation and implementation support. The role of human capital has been presented in the article, thus the need for training organization has been demonstrated to improve quality of work. The article also describes characteristics of the training market, defining types of projects addressed to representatives of the most often trained groups in the research and development unit, like professionals, managers and research workers. Methods and tools aiding the training system analysis and monitoring have also been introduced in the text with a goal to reflect customer, employer, and trainee satisfaction. A process of raising qualifications of employees was described at the Institute of Aviation. It has been found that internal trainings from the subject matter of “project management” are the best solution for research and development centers. | training project life cycle research and development unit | 2017 | 1 | 246 | 15-26 | 10.2478/TAR-2017-0002 | Transactions on Aerospace Research |
| Adam Rosłowicz, Paweł Bednarczyk | Analysis of heat transfer in a supersonic rocket head | ROCKET TECHNOLOGY | Design of supersonic H1 rocket by the Rocketry Group of Students’ Space Association (SR SKA) requires an analysis of thermal phenomena occurring in the elements particularly exposed to the high temperature gas. This paper contains a description of the methodology and the results of numerical simulation of heat transfer in the elements of the rocket head. The starting points were the flight conditions (3 characteristic points defined by altitude and Mach number) and independently calculated adiabatic temperature field of the gas. ANSYS Fluent code was used to determine the temperature field on the surface of the rocket. Computed cases were viscous and inviscid flow (for comparison). Based on the results formulated for the viscous case heat transfer boundary conditions, the numerical model and the thermophysical properties of materials were defined. The model was limited to a brass top part of the head and a part of a composite dome. Analytical and empirical method of “intermediate enthalpy” determined distribution of the heat transfer coefficient on the rocket surface. Then the transient heat transfer was calculated with the ANSYS system. It included the range from the rocket launch, moment of maximum Mach number to sufficient structure cooling. The results of the analyses were conclusions relevant to the further development work. Excessive heating of composite structures during the flight has been shown. | rocket technology computational fluid mechanics unsteady heat transfer ANSYS software | 2017 | 1 | 246 | 79-94 | 10.2478/TAR-2017-0008 | Transactions on Aerospace Research |
| Adam Rosłowicz, Paweł Bednarczyk | Analysis of heat transfer in a supersonic rocket head | Space technology | Design of supersonic H1 rocket by the Rocketry Group of Students’ Space Association (SR SKA) requires an analysis of thermal phenomena occurring in the elements particularly exposed to the high temperature gas. This paper contains a description of the methodology and the results of numerical simulation of heat transfer in the elements of the rocket head. The starting points were the flight conditions (3 characteristic points defined by altitude and Mach number) and independently calculated adiabatic temperature field of the gas. ANSYS Fluent code was used to determine the temperature field on the surface of the rocket. Computed cases were viscous and inviscid flow (for comparison). Based on the results formulated for the viscous case heat transfer boundary conditions, the numerical model and the thermophysical properties of materials were defined. The model was limited to a brass top part of the head and a part of a composite dome. Analytical and empirical method of “intermediate enthalpy” determined distribution of the heat transfer coefficient on the rocket surface. Then the transient heat transfer was calculated with the ANSYS system. It included the range from the rocket launch, moment of maximum Mach number to sufficient structure cooling. The results of the analyses were conclusions relevant to the further development work. Excessive heating of composite structures during the flight has been shown. | rocket technology computational fluid mechanics unsteady heat transfer ANSYS software | 2017 | 1 | 246 | 79-94 | 10.2478/TAR-2017-0008 | Transactions on Aerospace Research |
| Bartosz Brzozowski, Karol Kawka, Krzysztof Kaźmierczak, Zdzisław Rochala, Konrad Wojtowicz | Supporting the Process of Aircraft Maintenance with Mobile Devices | Aircraft operations | Maintenance of aircraft is a complex process and therefore, in order to optimize the process, integrated information systems are increasingly used. Rapid development and wide availability of mobile devices equipped with powerful processors and with a wide range of modern communication connections suggests their high usability for enterprise IT systems. In the Department of Avionics and Air Armament of the Military University of Technology (WAT) an ERP-class (Enterprise Resource Planning) system, intended to support aircraft maintenance [4] has been designed and developed. The main concept of the system is to store the aircraft related and maintenance information in a central repository, i.e. in databases hosted on a central database server. This solution ensures concurrent availability of the data to a large group of authorized users. The key components of the system include the database server and client applications, which ensure access to centralized information resources, according to assigned user rights. The project involves development of client applications using three technologies: web, desktop and mobile one. Developed client applications have successfully passed integration tests perfomed using sample maintenance data. Currently works on user authorization security and wireless data security are under way. | maintenance system mobile application aircraft | 2017 | 2 | 247 | 7-18 | 10.2478/TAR-2017-0011 | Transactions on Aerospace Research |
| Albert Zajdel, Cezary Szczepański, Mariusz Krawczyk, Jerzy Graffstein, Piotr Masłowski | Selected Aspects of the Low Level Automatic Taxi Control System Concept | Aircraft operations | Taxiing of manned and remotely piloted aircraft is still performed by pilots without using a system of automatic control of direction and speed. Several reasons have emerged in recent years that make the automation of taxiing an important design challenge. The reasons are: decreased airport capacity due to the growing number of aircraft, poor ground operation conditions during poor visibility conditions, an increase in workload of pilots and air traffic controllers and the integration of simultaneous ground operations of manned and remotely piloted air vehicles. This paper presents selected aspects of the concept of a Low Level Automatic Taxi Control System. In particular, it emphasizes the means of controlling an aircraft during taxiing, accuracy requirements of the system and proposes control techniques. The resulting controller of the system is adaptable for different aircrafts. The actuators and their mechanical connections to available controls are the aircraft specific part and are designed for the particular type – in this case – a general aviation light airplane. | taxi taxiing automatic taxi taxi control system | 2017 | 2 | 247 | 69-79 | 10.2478/TAR-2017-0016 | Transactions on Aerospace Research |
| Rafał Chatys, Anna Stefańska, Krzysztof Piernik, Konrad Stefański | Estimation of Strength Parameters of Aviation Products Made of Polymer Composites Based on Markov Chain Theory | Aircraft structures | The study investigates the fatigue strength of a component made of a glass composite material with polyester matrix, manufactured using a contact method (I) and by vacuum bagging (II). Modeling was carried out only for composite material II, due to significant spread of the strength of the composite material manufactured by contact lamination I, which means that such a material does not guarantee repeatability of the test results. Estimation of the composite material fatigue strength and residual strength was performed using a mathematical model based on the Markov chain theory. The model assumed that the material failure occurs at certain critical microvolume of the components operating within the plastic range. Observed relationships between the probability values and the distribution parameters for the static strength of the composite components, as well as the load values allow for deriving a fatigue curve equation. Obtained results are presented in the tables. | composite material composite testing fatigue strength residual strength Markov’s theory | 2017 | 2 | 247 | 19-30 | 10.2478/TAR-2017-0012 | Transactions on Aerospace Research |
| Rafał Chatys, Anna Stefańska, Krzysztof Piernik, Konrad Stefański | Estimation of Strength Parameters of Aviation Products Made of Polymer Composites Based on Markov Chain Theory | Aircraft structures | The study investigates the fatigue strength of a component made of a glass composite material with polyester matrix, manufactured using a contact method (I) and by vacuum bagging (II). Modeling was carried out only for composite material II, due to significant spread of the strength of the composite material manufactured by contact lamination I, which means that such a material does not guarantee repeatability of the test results. Estimation of the composite material fatigue strength and residual strength was performed using a mathematical model based on the Markov chain theory. The model assumed that the material failure occurs at certain critical microvolume of the components operating within the plastic range. Observed relationships between the probability values and the distribution parameters for the static strength of the composite components, as well as the load values allow for deriving a fatigue curve equation. Obtained results are presented in the tables. | composite material composite testing fatigue strength residual strength Markov’s theory | 2017 | 2 | 247 | 19-30 | 10.2478/TAR-2017-0012 | Transactions on Aerospace Research |
| Wiesław Masłowski, Tadeusz Opara, Michał Burek | Posturographic Tests of Candidates for Military Pilots | Aviation Medicine | One of the many elements of the process of qualifying the candidates for military aircraft pilots is the assessment of the correct functioning of their body balance system, responsible, inter alia, for spatial orientation during a flight. That system continuously controls the spatial position of the center of body mass. To measure that value directly is a complex metrological task. That is why an equivalent measure is used in tests of standing posture stability, i.e. the position of a projection of the center of mass on a supporting plane. | posturography body mass center position balance system force platform | 2017 | 2 | 247 | 45-56 | 10.2478/TAR-2017-0014 | Transactions on Aerospace Research |
| Jacek Pieniążek, Paulina Ryba | Eddy-Current Sensor for a Tachometer | Avionics | The speed of a rotor or rotors of a turbine engine is important information on its operation. Due to the specific conditions, in which the measurement is taken in a turbine engine, which in particular applies to small engines that are becoming increasingly popular in manned and unmanned aviation, the most universal detector is the detector using the phenomenon of eddy currents. This article presents the developed detector system solution. The correct operation of a detector is conditional upon the possibility to detect the presence of a blade in the detection field in a reliable manner, while maintaining the resistance to interference. The developed system is resistant to changes in parameters due to the use of a differential system consisting of two detector coils connected in a bridge circuit, a rectifier circuit with filters acting as a demodulator and a comparator. The system works with a microprocessor performing data processing functions. The executed functional model was tested in a laboratory, which enabled to determine its characteristics in several configurations and to confirm its correct operation. | rotational speed eddy currents measurement system | 2017 | 2 | 247 | 57-68 | 10.2478/TAR-2017-0015 | Transactions on Aerospace Research |
| Bogusław Dołęga, Grzegorz Kopecki, Andrzej Tomczyk | Analytical Redundancy in Control Systems for Unmanned Aircraft and Optionally Piloted Vehicles | Avionics | The article presents key properties of a module intended to estimate non-measurable state variables of an aircraft (a fixed-wing aircraft). Sample calculations are applicable to the MP-02A Czajka light Optionally Piloted Vehicle (OPV). The quality of flight parameter values’ estimation is illustrated by comparing flight parameters of the MP-02A Czajka aircraft recorded during actual flight with estimated values of respective parameters calculated during simulation of selected sensor faults. This experiment allows to evaluate the usefulness of the analytical redundancy mechanism that determines attitude parameters (roll, pitch and heading angles) and navigational variables (airspeed, altitude and geographic coordinates). | on-board measurement systems analytical redundancy UAV optionally piloted vehicles | 2017 | 2 | 247 | 31-44 | 10.2478/TAR-2017-0013 | Transactions on Aerospace Research |
| Marcin Żugaj | Reconfiguration of Unmanned Aircraft Control System | Avionics | Reliability of unmanned aircraft is a decisive factor for conducting air tasks in controlled airspace. One of the means used to improve unmanned aircraft reliability is reconfiguration of the control system, which will allow to maintain control over the aircraft despite occurring failures. The control system is reconfigured by using operational control surfaces, to compensate for failure consequences and to control the damaged aircraft. Development of effective reconfiguration algorithms involves utilization of a non-linear model of unmanned aircraft dynamics, in which deflection of each control surface can be controlled independently. | control reconfiguration unmanned aircraft | 2017 | 2 | 247 | 80-96 | 10.2478/TAR-2017-0017 | Transactions on Aerospace Research |
| Marcin Żugaj, Przemysław Bibik, Marcin Figat | An Unmanned Aircraft Model for Control System Reconfiguration Analysis and Synthesis | Avionics | Reliability of unmanned aircraft is a decisive factor for conducting air tasks in a controlled airspace. One of the means of improving unmanned aircraft reliability is reconfiguration of the control system, which will allow to maintain control over the aircraft despite an occurring failure. The control system is reconfigured by using still operational control surfaces to compensate for failure consequences and to control the damaged aircraft. Development of effective reconfiguration algorithms involves utilization of a non-linear model of unmanned aircraft dynamics, in which each control surface deflection can be controlled independently. | flight dynamics control reconfiguration | 2017 | 2 | 247 | 97-116 | 10.2478/TAR-2017-0018 | Transactions on Aerospace Research |
| Bogusław Dołęga, Grzegorz Kopecki, Andrzej Tomczyk | Analytical Redundancy in Control Systems for Unmanned Aircraft and Optionally Piloted Vehicles | Avionics | The article presents key properties of a module intended to estimate non-measurable state variables of an aircraft (a fixed-wing aircraft). Sample calculations are applicable to the MP-02A Czajka light Optionally Piloted Vehicle (OPV). The quality of flight parameter values’ estimation is illustrated by comparing flight parameters of the MP-02A Czajka aircraft recorded during actual flight with estimated values of respective parameters calculated during simulation of selected sensor faults. This experiment allows to evaluate the usefulness of the analytical redundancy mechanism that determines attitude parameters (roll, pitch and heading angles) and navigational variables (airspeed, altitude and geographic coordinates). | on-board measurement systems analytical redundancy UAV optionally piloted vehicles | 2017 | 2 | 247 | 31-44 | 10.2478/TAR-2017-0013 | Transactions on Aerospace Research |
| Marcin Żugaj | Reconfiguration of Unmanned Aircraft Control System | Avionics | Reliability of unmanned aircraft is a decisive factor for conducting air tasks in controlled airspace. One of the means used to improve unmanned aircraft reliability is reconfiguration of the control system, which will allow to maintain control over the aircraft despite occurring failures. The control system is reconfigured by using operational control surfaces, to compensate for failure consequences and to control the damaged aircraft. Development of effective reconfiguration algorithms involves utilization of a non-linear model of unmanned aircraft dynamics, in which deflection of each control surface can be controlled independently. | control reconfiguration unmanned aircraft | 2017 | 2 | 247 | 80-96 | 10.2478/TAR-2017-0017 | Transactions on Aerospace Research |
| Marcin Żugaj, Przemysław Bibik, Marcin Figat | An Unmanned Aircraft Model for Control System Reconfiguration Analysis and Synthesis | Avionics | Reliability of unmanned aircraft is a decisive factor for conducting air tasks in a controlled airspace. One of the means of improving unmanned aircraft reliability is reconfiguration of the control system, which will allow to maintain control over the aircraft despite an occurring failure. The control system is reconfigured by using still operational control surfaces to compensate for failure consequences and to control the damaged aircraft. Development of effective reconfiguration algorithms involves utilization of a non-linear model of unmanned aircraft dynamics, in which each control surface deflection can be controlled independently. | flight dynamics control reconfiguration | 2017 | 2 | 247 | 97-116 | 10.2478/TAR-2017-0018 | Transactions on Aerospace Research |
| Rafał Chatys, Anna Stefańska, Krzysztof Piernik, Konrad Stefański | Estimation of Strength Parameters of Aviation Products Made of Polymer Composites Based on Markov Chain Theory | COMPOSITE MATERIALS | The study investigates the fatigue strength of a component made of a glass composite material with polyester matrix, manufactured using a contact method (I) and by vacuum bagging (II). Modeling was carried out only for composite material II, due to significant spread of the strength of the composite material manufactured by contact lamination I, which means that such a material does not guarantee repeatability of the test results. Estimation of the composite material fatigue strength and residual strength was performed using a mathematical model based on the Markov chain theory. The model assumed that the material failure occurs at certain critical microvolume of the components operating within the plastic range. Observed relationships between the probability values and the distribution parameters for the static strength of the composite components, as well as the load values allow for deriving a fatigue curve equation. Obtained results are presented in the tables. | composite material composite testing fatigue strength residual strength Markov’s theory | 2017 | 2 | 247 | 19-30 | 10.2478/TAR-2017-0012 | Transactions on Aerospace Research |
| Rafał Chatys, Anna Stefańska, Krzysztof Piernik, Konrad Stefański | Estimation of Strength Parameters of Aviation Products Made of Polymer Composites Based on Markov Chain Theory | COMPOSITES | The study investigates the fatigue strength of a component made of a glass composite material with polyester matrix, manufactured using a contact method (I) and by vacuum bagging (II). Modeling was carried out only for composite material II, due to significant spread of the strength of the composite material manufactured by contact lamination I, which means that such a material does not guarantee repeatability of the test results. Estimation of the composite material fatigue strength and residual strength was performed using a mathematical model based on the Markov chain theory. The model assumed that the material failure occurs at certain critical microvolume of the components operating within the plastic range. Observed relationships between the probability values and the distribution parameters for the static strength of the composite components, as well as the load values allow for deriving a fatigue curve equation. Obtained results are presented in the tables. | composite material composite testing fatigue strength residual strength Markov’s theory | 2017 | 2 | 247 | 19-30 | 10.2478/TAR-2017-0012 | Transactions on Aerospace Research |
| Albert Zajdel, Cezary Szczepański, Mariusz Krawczyk, Jerzy Graffstein, Piotr Masłowski | Selected Aspects of the Low Level Automatic Taxi Control System Concept | Control systems | Taxiing of manned and remotely piloted aircraft is still performed by pilots without using a system of automatic control of direction and speed. Several reasons have emerged in recent years that make the automation of taxiing an important design challenge. The reasons are: decreased airport capacity due to the growing number of aircraft, poor ground operation conditions during poor visibility conditions, an increase in workload of pilots and air traffic controllers and the integration of simultaneous ground operations of manned and remotely piloted air vehicles. This paper presents selected aspects of the concept of a Low Level Automatic Taxi Control System. In particular, it emphasizes the means of controlling an aircraft during taxiing, accuracy requirements of the system and proposes control techniques. The resulting controller of the system is adaptable for different aircrafts. The actuators and their mechanical connections to available controls are the aircraft specific part and are designed for the particular type – in this case – a general aviation light airplane. | taxi taxiing automatic taxi taxi control system | 2017 | 2 | 247 | 69-79 | 10.2478/TAR-2017-0016 | Transactions on Aerospace Research |
| Bartosz Brzozowski, Karol Kawka, Krzysztof Kaźmierczak, Zdzisław Rochala, Konrad Wojtowicz | Supporting the Process of Aircraft Maintenance with Mobile Devices | Maintenance | Maintenance of aircraft is a complex process and therefore, in order to optimize the process, integrated information systems are increasingly used. Rapid development and wide availability of mobile devices equipped with powerful processors and with a wide range of modern communication connections suggests their high usability for enterprise IT systems. In the Department of Avionics and Air Armament of the Military University of Technology (WAT) an ERP-class (Enterprise Resource Planning) system, intended to support aircraft maintenance [4] has been designed and developed. The main concept of the system is to store the aircraft related and maintenance information in a central repository, i.e. in databases hosted on a central database server. This solution ensures concurrent availability of the data to a large group of authorized users. The key components of the system include the database server and client applications, which ensure access to centralized information resources, according to assigned user rights. The project involves development of client applications using three technologies: web, desktop and mobile one. Developed client applications have successfully passed integration tests perfomed using sample maintenance data. Currently works on user authorization security and wireless data security are under way. | maintenance system mobile application aircraft | 2017 | 2 | 247 | 7-18 | 10.2478/TAR-2017-0011 | Transactions on Aerospace Research |
| Wojciech Konior | Particle-in-cell Electrostatic Numerical Algorithm | Aerodynamics | Existing global models of interaction between the solar wind (SW) and the local interstellar medium (LISM) describe the heliosphere that arises as a result of this interaction. There is a strong motivation to develop a kinetic model using the Particle-in-Cell (PIC) method to describe phenomena which appear in the heliosphere. This is however a long term scientific goal. This paper describes an electrostatic Particle-in-Cell numerical model developed in the Institute of Aviation in Warsaw, which includes mechanical and charge exchange collisions between particles in the probabilistic manner using Direct Simulation Monte Carlo method. This is the first step into developing simulations of the heliosphere incorporating kinetic effects in collisionless plasmas. In this paper we focus only on presenting the work, which have been done on the numerical PIC algorithm. | plasma neutral particles Particle-in-Cell Monte-Carlo Method | 2017 | 3 | 248 | 24-45 | 10.2478/TAR-2017-0020 | Transactions on Aerospace Research |
| Rafał Szymański, Mateusz Zięba | Manufacturing and Testing of Carbon Composite Samples Intended for Aviation | COMPOSITE MATERIALS | The paper presents the manufacturing technology and quality control of samples made of composite materials intended, inter alia, for aircraft elements. The samples are made from carbon fiber reinforced prepreg in a polymer matrix which is commonly used in the aerospace industry. The authors described the dimensional requirements for samples made of composite materials for strength testing, and the main stages of production which have a direct impact on the quality of composite samples. Also presented is the technological process of producing flat carbon composite panels for composite samples, cutting the produced panels with a CNC plotter, cutting the samples on a conventional milling machine, and surface treatment of the samples on a surface grinder. The machining parameters that were experientially found to be optimal for the milling and grinding of carbon samples are specified as well. Finally, the method of quality control of the ready composite samples is described and solutions are presented to improve the production of high-quality samples. | carbon prepregs composite technology vacuum consolidation strength testing | 2017 | 3 | 248 | 107-116 | 10.2478/TAR-2017-0024 | Transactions on Aerospace Research |
| Rafał Szymański, Mateusz Zięba | Manufacturing and Testing of Carbon Composite Samples Intended for Aviation | COMPOSITE STRUCTURES | The paper presents the manufacturing technology and quality control of samples made of composite materials intended, inter alia, for aircraft elements. The samples are made from carbon fiber reinforced prepreg in a polymer matrix which is commonly used in the aerospace industry. The authors described the dimensional requirements for samples made of composite materials for strength testing, and the main stages of production which have a direct impact on the quality of composite samples. Also presented is the technological process of producing flat carbon composite panels for composite samples, cutting the produced panels with a CNC plotter, cutting the samples on a conventional milling machine, and surface treatment of the samples on a surface grinder. The machining parameters that were experientially found to be optimal for the milling and grinding of carbon samples are specified as well. Finally, the method of quality control of the ready composite samples is described and solutions are presented to improve the production of high-quality samples. | carbon prepregs composite technology vacuum consolidation strength testing | 2017 | 3 | 248 | 107-116 | 10.2478/TAR-2017-0024 | Transactions on Aerospace Research |
| Rafał Szymański, Mateusz Zięba | Manufacturing and Testing of Carbon Composite Samples Intended for Aviation | COMPOSITES | The paper presents the manufacturing technology and quality control of samples made of composite materials intended, inter alia, for aircraft elements. The samples are made from carbon fiber reinforced prepreg in a polymer matrix which is commonly used in the aerospace industry. The authors described the dimensional requirements for samples made of composite materials for strength testing, and the main stages of production which have a direct impact on the quality of composite samples. Also presented is the technological process of producing flat carbon composite panels for composite samples, cutting the produced panels with a CNC plotter, cutting the samples on a conventional milling machine, and surface treatment of the samples on a surface grinder. The machining parameters that were experientially found to be optimal for the milling and grinding of carbon samples are specified as well. Finally, the method of quality control of the ready composite samples is described and solutions are presented to improve the production of high-quality samples. | carbon prepregs composite technology vacuum consolidation strength testing | 2017 | 3 | 248 | 107-116 | 10.2478/TAR-2017-0024 | Transactions on Aerospace Research |
| Stanisław Popowski, Witold Dąbrowski | Individual Autonomous Navigation System | Navigation | The article presents the Individual Autonomous System Navigation (IANS) supporting–rescuer or firemen in terms of navigation. Basic assumptions, which such a system has to fulfill in terms of functionality and accuracy, are presented. The concept of the ISAN system is based on the implementation of inertial navigation system which the only one to permit fully autonomous functioning. Measurement sensors of the navigation system with microprocessor board are placed in the rescuer’s shoe. To limit the escalation of the navigation errors value, which in the case of inertial navigation rises exponentially, a procedure of navigation parameters upgrading at every step of the rescuer is introduced to the proposed system. This procedure guarantees the required accuracy of navigation achievement. The article describes a developed and manufactured demonstrator of the technology and presents main results of its research. The research conducted in a building consisted in walking on the same level several hundred meters in less than 10 minutes. A walking test with a change of walking height was also performed in order to estimate the accuracy of the vertical channel. Results of the demonstrator’s tests let us conclude that the error of navigation is below 1% of the travelled distance and the accuracy is linear in respect to time. The achieved accuracy is fully sufficient for a practical IANS application. | rescuer navigation system inertial navigation system ZUPT procedure Individual Autonomous Navigation System IANS | 2017 | 3 | 248 | 84-106 | 10.2478/TAR-2017-0023 | Transactions on Aerospace Research |
| Jan Kindracki | Temperature Measurements in the Detonation Chamber Supplied by Air from Centrifugal Compressor and Gaseous Hydrogen | Propulsion | In this paper, the experimental results of a detonation chamber fed by air from a centrifugal compressor are presented. The detonation chamber was equipped with many different sensors, mostly thermocouples, which were placed in 11 different positions. The distribution of temperature changes along the chamber and radial temperature profile at the outlet are provided. The results here confirm the existence of high mixture stratification. Such mixture stratifications and temperature profiles may be used as an additional chamber wall cooling method. The experiments performed, address key issues regarding the chamber choking problem caused by turbines. The relationship between the turbine performance and detonation chamber are crucial for proper control of turbine jet engine. | rotating detonation RDE engine temperature measurements | 2017 | 3 | 248 | 7-23 | 10.2478/TAR-2017-0019 | Transactions on Aerospace Research |
| Anna M. Mazur, Tomasz Korniluk, Roman Domański | Measuring and Testing the Parameters of a Battery Pack Designed for Powering Unmanned Aircraft Systems at Various Temperatures | Propulsion | This paper describes results of tests dedicated to studying – in simulated environmental conditions – operation of a battery pack designed for powering unmanned aircraft systems. In particular, the tests concerned determining the electrical parameters of battery packs, with and without radiators, during their operation in changing environmental conditions and resistance to large temperature fluctuations. Amicell, a high density lithium polymer battery manufactured by the Israeli Amit Industries ltd., was selected for testing. The test results present characteristics of the batteries tested in different temperatures and allow for designing and trying out proper battery protections against environmental conditions, with the intention to attain continuous and correct operation. The tests have been carried out in the accredited Environmental Test Laboratory which is part of the Department of Avionics of the Institute of Aviation in Poland. | lithium polymer batteries environmental test laboratory UAS Unmanned Aircraft Systems | 2017 | 3 | 248 | 46-62 | 10.2478/TAR-2017-0021 | Transactions on Aerospace Research |
| Mateusz Paszko | Infrared Signature Suppression Systems in Modern Military Helicopters | Rotorcraft technology | Helicopters play an important role in air-to-ground fire covering and the short-distance air-to-air fights, as well as the anti-tank missions and battlefield force transferring. The detection and survivability of helicopters on a battlefield significantly depends on their infrared emissions level, as well as the methods, equipment and systems used by potential enemy. The automatic detection systems, recognition and identification of flying objects use among other the thermo-detection methods, which rely on detecting the infrared radiation emitted by the tracked object. Furthermore, due to low-altitude and relatively low flight speed, today’s combat assets like missile weapons equipped with infrared guidance systems are one of the most important threats to the helicopters performing combat missions. Especially meaningful in a helicopter aviation is infrared emission by exhaust gases, egressed to the surroundings. Due to high temperature, exhaust gases are a major factor in detectability of a helicopter performing air combat operations. In order to increase the combat effectiveness and survivability of military helicopters, several different types of the infrared suppressor (IRS) have been developed. This paper reviews contemporary developments in this discipline, with particular examples of the infrared signature suppression systems. | infrared military helicopter stealth radiation suppression | 2017 | 3 | 248 | 63-83 | 10.2478/TAR-2017-0022 | Transactions on Aerospace Research |
| Wojciech Konior | Particle-in-cell Electrostatic Numerical Algorithm | Space observations | Existing global models of interaction between the solar wind (SW) and the local interstellar medium (LISM) describe the heliosphere that arises as a result of this interaction. There is a strong motivation to develop a kinetic model using the Particle-in-Cell (PIC) method to describe phenomena which appear in the heliosphere. This is however a long term scientific goal. This paper describes an electrostatic Particle-in-Cell numerical model developed in the Institute of Aviation in Warsaw, which includes mechanical and charge exchange collisions between particles in the probabilistic manner using Direct Simulation Monte Carlo method. This is the first step into developing simulations of the heliosphere incorporating kinetic effects in collisionless plasmas. In this paper we focus only on presenting the work, which have been done on the numerical PIC algorithm. | plasma neutral particles Particle-in-Cell Monte-Carlo Method | 2017 | 3 | 248 | 24-45 | 10.2478/TAR-2017-0020 | Transactions on Aerospace Research |
| Paweł Ruchała, Robert Placek, Wit Stryczniewicz, Jan Matyszewski, Dawid Cieśliński, Bartosz Bartkowiak | Wind Tunnel Tests of Influence of Boosters and Fins on Aerodynamic Characteristics of the Experimental Rocket Platform | Aerodynamics | The paper presents results of wind tunnel tests of the Experimental Rocket Platform (ERP), which is developed in Institute of Aviation. It is designed as an easy accessible and affordable platform for microgravity experiments. Proposed design enables to perform experiments in microgravity for almost 150 seconds with apogee of about 100 km. | Aerodynamics of rocket flight mechanics of rocket wind tunnel tests experimental rocket platform ERP sounding rocket | 2017 | 4 | 249 | 82-102 | 10.2478/TAR-2017-0030 | Transactions on Aerospace Research |
| František Löffelmann | Stress Distribution Investigation at the Tapered Sandwich Endings | Aircraft design | One of the typical sandwich ending is tapered transition to a solid laminate, which causes significant stress distribution changes. The reviewed articles show that tapered area causes increase in the shear stress in the core, increase of the axial forces in the facesheets and local bending at the fork point, at points of the tapering angle change, and at ply drop positions. Most of the studies gave attention to the endings without reinforcing. During Erasmus+ internship at KTH 2D model of the tapered ending with reinforcing plies, various geometry and resin filler in the core tip was investigated to see the influence on the stress distribution. It was found that tension load case is not as critical as bending load case. Increasing of the solid laminate thickness, adding plies and inserting a short resin or adhesive filler into the core tip area lead to significant stress reduction, whereas in the transition point, from tapering to constant thickness sandwich, increasing radius is more efficient than reinforcing plies in regard to reduce stress concentration. | Sandwich endings Tapering Ramp Closeout FEM Filler Ply drop | 2017 | 4 | 249 | 64-81 | 10.2478/TAR-2017-0029 | Transactions on Aerospace Research |
| Miłosz Kalinowski | Aero-Structural Optimization of Joined-Wing Aircraft | Aircraft design | Joined-wing aircraft due to its energy characteristics is a suitable configuration for electric aircraft when designed properly. However, because of the specific for this aircraft phenomenons (e.g. static indeterminacy of structure, aerodynamic interference of lifting surfaces) it demands more complicated methods to model its behavior than a traditional aircraft configurations. For these reasons the aero-structural optimization process is proposed for joined-wing aircrafts that is suitable for preliminary design. The process is a global search, modular algorithm based on automatic geometry generator, FEM solver and aerodynamic panel method. The range of aircraft was assumed as an objective function. The algorithm was successfully tested on UAV aircraft. The improvement of 19% of total aircraft range is achieved in comparison to baseline aircraft. Time of evaluation of this global search algorithm is similar to the time characteristic for local optimization methods. It allows to reduce the time and costs of preliminary design of joined-wing. | Joined-wing multidyscyplinary optimization preliminary design | 2017 | 4 | 249 | 48-63 | 10.2478/TAR-2017-0028 | Transactions on Aerospace Research |
| Marco Fioriti, Luca Boggero, Sabrina Corpino | Preliminary Sub-Systems Design Integrated in a Multidisciplinary Design Optimization Framework | Aircraft design | The aircraft design is a complex subject since several and completely different design disciplines are involved in the project. Many efforts are made to harmonize and optimize the design trying to combine all disciplines together at the same level of detail. Within the ongoing AGILE (Horizon 2020) research, an aircraft MDO (Multidisciplinary Design Optimization) process is setting up connecting several design tools and competences together. Each tool covers a different design discipline such as aerodynamics, structure, propulsion and systems. This paper focuses on the integration of the sub-system design discipline with the others in order to obtain a complete and optimized aircraft preliminary design. All design parameters used to integrate the sub-system branch with the others are discussed as for their redefinition within the different detail level of the design. | Multidisciplinary Design Optimization Aircraft Sub-system Design Design Space Parameters | 2017 | 4 | 249 | 9-23 | 10.2478/TAR-2017-0025 | Transactions on Aerospace Research |
| František Löffelmann | Stress Distribution Investigation at the Tapered Sandwich Endings | COMPOSITE MATERIALS | One of the typical sandwich ending is tapered transition to a solid laminate, which causes significant stress distribution changes. The reviewed articles show that tapered area causes increase in the shear stress in the core, increase of the axial forces in the facesheets and local bending at the fork point, at points of the tapering angle change, and at ply drop positions. Most of the studies gave attention to the endings without reinforcing. During Erasmus+ internship at KTH 2D model of the tapered ending with reinforcing plies, various geometry and resin filler in the core tip was investigated to see the influence on the stress distribution. It was found that tension load case is not as critical as bending load case. Increasing of the solid laminate thickness, adding plies and inserting a short resin or adhesive filler into the core tip area lead to significant stress reduction, whereas in the transition point, from tapering to constant thickness sandwich, increasing radius is more efficient than reinforcing plies in regard to reduce stress concentration. | Sandwich endings Tapering Ramp Closeout FEM Filler Ply drop | 2017 | 4 | 249 | 64-81 | 10.2478/TAR-2017-0029 | Transactions on Aerospace Research |
| František Löffelmann | Stress Distribution Investigation at the Tapered Sandwich Endings | COMPOSITE STRUCTURES | One of the typical sandwich ending is tapered transition to a solid laminate, which causes significant stress distribution changes. The reviewed articles show that tapered area causes increase in the shear stress in the core, increase of the axial forces in the facesheets and local bending at the fork point, at points of the tapering angle change, and at ply drop positions. Most of the studies gave attention to the endings without reinforcing. During Erasmus+ internship at KTH 2D model of the tapered ending with reinforcing plies, various geometry and resin filler in the core tip was investigated to see the influence on the stress distribution. It was found that tension load case is not as critical as bending load case. Increasing of the solid laminate thickness, adding plies and inserting a short resin or adhesive filler into the core tip area lead to significant stress reduction, whereas in the transition point, from tapering to constant thickness sandwich, increasing radius is more efficient than reinforcing plies in regard to reduce stress concentration. | Sandwich endings Tapering Ramp Closeout FEM Filler Ply drop | 2017 | 4 | 249 | 64-81 | 10.2478/TAR-2017-0029 | Transactions on Aerospace Research |
| František Löffelmann | Stress Distribution Investigation at the Tapered Sandwich Endings | COMPOSITES | One of the typical sandwich ending is tapered transition to a solid laminate, which causes significant stress distribution changes. The reviewed articles show that tapered area causes increase in the shear stress in the core, increase of the axial forces in the facesheets and local bending at the fork point, at points of the tapering angle change, and at ply drop positions. Most of the studies gave attention to the endings without reinforcing. During Erasmus+ internship at KTH 2D model of the tapered ending with reinforcing plies, various geometry and resin filler in the core tip was investigated to see the influence on the stress distribution. It was found that tension load case is not as critical as bending load case. Increasing of the solid laminate thickness, adding plies and inserting a short resin or adhesive filler into the core tip area lead to significant stress reduction, whereas in the transition point, from tapering to constant thickness sandwich, increasing radius is more efficient than reinforcing plies in regard to reduce stress concentration. | Sandwich endings Tapering Ramp Closeout FEM Filler Ply drop | 2017 | 4 | 249 | 64-81 | 10.2478/TAR-2017-0029 | Transactions on Aerospace Research |
| Miłosz Kalinowski | Aero-Structural Optimization of Joined-Wing Aircraft | Multidisciplinary optimisation | Joined-wing aircraft due to its energy characteristics is a suitable configuration for electric aircraft when designed properly. However, because of the specific for this aircraft phenomenons (e.g. static indeterminacy of structure, aerodynamic interference of lifting surfaces) it demands more complicated methods to model its behavior than a traditional aircraft configurations. For these reasons the aero-structural optimization process is proposed for joined-wing aircrafts that is suitable for preliminary design. The process is a global search, modular algorithm based on automatic geometry generator, FEM solver and aerodynamic panel method. The range of aircraft was assumed as an objective function. The algorithm was successfully tested on UAV aircraft. The improvement of 19% of total aircraft range is achieved in comparison to baseline aircraft. Time of evaluation of this global search algorithm is similar to the time characteristic for local optimization methods. It allows to reduce the time and costs of preliminary design of joined-wing. | Joined-wing multidyscyplinary optimization preliminary design | 2017 | 4 | 249 | 48-63 | 10.2478/TAR-2017-0028 | Transactions on Aerospace Research |
| Marco Fioriti, Luca Boggero, Sabrina Corpino | Preliminary Sub-Systems Design Integrated in a Multidisciplinary Design Optimization Framework | Multidisciplinary optimisation | The aircraft design is a complex subject since several and completely different design disciplines are involved in the project. Many efforts are made to harmonize and optimize the design trying to combine all disciplines together at the same level of detail. Within the ongoing AGILE (Horizon 2020) research, an aircraft MDO (Multidisciplinary Design Optimization) process is setting up connecting several design tools and competences together. Each tool covers a different design discipline such as aerodynamics, structure, propulsion and systems. This paper focuses on the integration of the sub-system design discipline with the others in order to obtain a complete and optimized aircraft preliminary design. All design parameters used to integrate the sub-system branch with the others are discussed as for their redefinition within the different detail level of the design. | Multidisciplinary Design Optimization Aircraft Sub-system Design Design Space Parameters | 2017 | 4 | 249 | 9-23 | 10.2478/TAR-2017-0025 | Transactions on Aerospace Research |
| Mikołaj Górzyński, Przemysław Bibik | Designing and Building Heavy Lifting Modification of a Radio Controlled Helicopter | ROTORCRAFT TECHNOLOGY | The paper presents the heavy lifting modification of radio controlled T-Rex 700 DFC PRO helicopter which was originally designed as acrobatic machine. The purpose of designing machine like this is a need for a cheap and reliable machine specifically designed to carry weights for research and development purposes. Thanks to its design there is a possibility to attach to it a measuring apparatus, modules like auto-pilot, and weights. It can be also used to test wide range of rotors and other components which makes it very universal research tool. To achieve those goals the whole frame and landing gear has been redesigned using NX 11 CAD/CAM/CAE to achieve desired cargo space and weight distribution. Additionally the tail has been lengthened to allow use of the rotors with bigger diagonal. All the applied changes has been made to increase the machine payload. The designed elements were fabricated and the helicopter has been tested in flight. During the test flights several performance parameters were measured. | helicopter rotor modification | 2017 | 4 | 249 | 35-47 | 10.2478/TAR-2017-0027 | Transactions on Aerospace Research |
| Wieńczysław Stalewski | Improvement and Optimisation of Gyroplane Performance | ROTORCRAFT TECHNOLOGY | The aim of this study was to investigate possibilities of improving performance characteristics of light gyroplane, as well to propose new or improved solutions enhancing performance of this type of rotorcraft. The study has been conducted based on computational methods of Computational Fluid Dynamics, Flight Dynamics, Computer Aided Design and Optimisation. Results of the research confirm that using advanced computational methods it is possible to improve significantly the performance characteristics of light gyroplane. It can be achieved both through optimisation of the main rotor design and flight control strategy. An unconventional approach to rotorcraft optimisation has been presented, distinguishing by the fact that the objective was calculated based on computer simulations of selected states of gyroplane flight. One of the optimised main rotors had already been examined during flight tests, which confirmed its good perfonnance-and-exploitation properties and its advantage over classic gyroplane rotors. Developed by the author the family of gyroplane airfoils is a valuable alternative to classic airfoils utilised so far. The same applies to the blades built based on those airfoils. In particular, it concerns the unconventional design of the rotor blade of span-variable: chord and relative thickness. The developed methodology of numerical optimisation of flight-control strategy during the jump takeoff of the gyroplane presents an original approach to those problems and may be valuable tool supporting gyroplane-pilot training. | rotorcraft performance gyroplane jump takeoff main rotor design and optimisation | 2017 | 4 | 249 | 103-122 | 10.2478/TAR-2017-0031 | Transactions on Aerospace Research |
| Joanna Gocłowska-Bolek | Latin American Space Research as a Regional and Supra-Regional Research Cooperation Mechanism | Scientific co-operation | The interest of Latin American countries in space research has been successfully developing for many decades. It has its roots in the first development programmes for the Brazilian and Argentinian defence industry within the import substitution strategy, and then the export-oriented strategy during the period of the military rule. The endogenous development of space technology was treated in those countries as a priority and served as a way to diffuse technology to other industries, and as a model for the other countries in the region (Peru and Venezuela), which wished to develop outer space programme by developing their own technologies within the chosen range or by partaking in broader cooperation programmes on the Latin American continent [1]. The Latin American space agencies, which already existed in many countries in the 1960s and the 1970s, were carrying out relatively costly research, treating development in this area not only as the achievement of the economic development objectives, but also as an attempt to oppose the dominance of Washington [2]. Despite of the vast funding on endogenous research in the field of space engineering being provided, until the end of the last century only the projects conducted together with the Soviet Union (Cuba) or The United States were accomplished successfully. Currently and in the nearest future, the Latin American countries are still forced to rely on external assistance with satellite launching, expertise, more advanced technologies, etc. It should be noticed that countries conducting advanced and costly space programmes: the United States, Russia, China and the European Union (especially France and – but to a substantially lesser degree – Italy) show a growing interest in cooperation with Latin America and appreciation towards their specialists, high quality research and space technologies. | Latin America Brazil space research innovation scientific cooperation | 2017 | 4 | 249 | 24-34 | 10.2478/TAR-2017-0026 | Transactions on Aerospace Research |
| Marco Fioriti, Luca Boggero, Sabrina Corpino | Preliminary Sub-Systems Design Integrated in a Multidisciplinary Design Optimization Framework | Systems | The aircraft design is a complex subject since several and completely different design disciplines are involved in the project. Many efforts are made to harmonize and optimize the design trying to combine all disciplines together at the same level of detail. Within the ongoing AGILE (Horizon 2020) research, an aircraft MDO (Multidisciplinary Design Optimization) process is setting up connecting several design tools and competences together. Each tool covers a different design discipline such as aerodynamics, structure, propulsion and systems. This paper focuses on the integration of the sub-system design discipline with the others in order to obtain a complete and optimized aircraft preliminary design. All design parameters used to integrate the sub-system branch with the others are discussed as for their redefinition within the different detail level of the design. | Multidisciplinary Design Optimization Aircraft Sub-system Design Design Space Parameters | 2017 | 4 | 249 | 9-23 | 10.2478/TAR-2017-0025 | Transactions on Aerospace Research |
| Sławomir Cieślak, Wiesław Krzymień | Drivetrain Noise of the Gyroplane I-28 | Acoustics | Gyroplanes, as ultralight aircraft, are popular transport vehicles recently. Ultralight aircraft flights take place at a low altitude – their noise is not without effect on people and nature. The localization of the sources of noise and a possibility to decrease the noise of an gyroplane are described in this paper. The rules of design and exploitation of gyroplanes do not define the limits of emitted noise. | gyroplane noise acoustic camera beamforming propeller noise | 2018 | 1 | 250 | 7-16 | 10.2478/TAR-2018-0001 | Transactions on Aerospace Research |
| Jan Muchowski, Marek Szumski, Andrzej Krzysiak | Aerodynamic Concept of the UAV in the Gyrodyne Configuration | Aerodynamics | The article presents an aerodynamic concept of UAV in the gyrodyne configuration, as a more efficient one than the currently used UAV airframe configuration applied for monitoring tasks of power lines and railway infrastructure. A sample task which is realised by conceptual gyrodyne based on monitoring aerial power lines was characterised and described. The assumed idea of UAV was shown in comparison to the currently used aircraft configuration presented in the introduction. Referring to momentum theory, hover efficiency of the multicopter and the helicopter was evaluated. In relation to the helicopter, an initial draft of the airframe conception accompanied by a description of advantages of the gyrodyne configuration was exposed. Problems related to the gyrodyne configuration were emphasised in the summary. | aerodynamic concept UAV VTOL gyrodyne airframe configuration | 2018 | 1 | 250 | 49-66 | 10.2478/TAR-2018-0005 | Transactions on Aerospace Research |
| Tomasz Seredyn, Adam Dziubiński, Piotr Jaśkowski | CFD Analysis of the Fluid Particles Distribution by Means of Aviation Technique | Aerodynamics | The article describes a computational study, using CFD models, of droplet spray dispersal in the wake of a ‘Turbo Kruk’ airplane up to 500 m downstream. The CFD Reynolds-averaged Navier-Stokes (RANS) models use a Lagrangian (droplet phase) and Eulerian (fluid phase) procedure to predict the droplet trajectories trough the turbulent aircraft wake. The methods described in the work have the potential to improve current models for aerial spraying and will help in the development of new spraying procedures. In this study, the CFD models are used to describe the phenomenon of sprays released from atomizers mounted on the plane. A parametric study of the aircraft model examines the effects of crosswind on the aircraft’s vortex structures and the resulting droplet trajectories. The study shows, that such influence is underestimated in the current models. A comparison of the present results to AGDISP predictions is provided. | Droplets dispersion modeling Pesticide spraying Agricultural aircraft wake | 2018 | 1 | 250 | 67-97 | 10.2478/TAR-2018-0006 | Transactions on Aerospace Research |
| Łukasz Kędzierski | Compressed Air Supply and Distribution System for Aviation Laboratories and Wind Tunnels | Aerodynamics | The purpose of this text is to demonstrate an operation of a compressed air system designed for high air flow laboratories and wind tunnels. Development of such air system is a challenge due to unusual requirements (simultaneous supply of several users having different requirements and necessity to provide extremely high flows) which have to be address by means of adequate compressed air storage capacity and sophisticated control system. Each stage of the design process is going to be described, focusing on the selection of air compressors, air receivers and air dryers, followed by an insight into a development of the control system. The air system being described in this paper was successfully implemented at the Institute of Aviation in Warsaw improving the quality of the compressed air supply and simplifying the research planning. | compressed air laboratory wind tunnel | 2018 | 1 | 250 | 26-35 | 10.2478/TAR-2018-0003 | Transactions on Aerospace Research |
| Wit Stryczniewicz | Quantitative Visualisation of Compressible Flows | Aerodynamics | The paper demonstrates the feasibility of quantitative flow visualisation methods for investigation of transonic and supersonic flows. Two methods and their application for retrieving compressible flow field properties has been described: Background Oriented Schlieren (BOS) and Particle Image Velocimetry (PIV). Recently introduced BOS technique extends the capabilities of classical Schlieren technique by use of digital image processing and allow to measure density gradients field. In the presented paper a review of applications of BOS technique has been presented. The PIV is well established technique for whole field velocity measurements. This paper presents application of PIV for determination of the shock wave position above airfoil in transonic flow regime. The study showed that application of quantitative flow visualisation techniques allows to gain new insights on the complex phenomenon of supersonic and transonic flow over airfoils like shock-boundary layer interaction and shock induced flow separation. | compressible fluid flow flow visualisation wind tunnel studies Particle Image Velocimetry Background Oriented Schlieren | 2018 | 1 | 250 | 137-145 | 10.2478/TAR-2018-0009 | Transactions on Aerospace Research |
| Wieńczysław Stalewski | Flow Control on Helicopter – Rotor Blades via Active Gurney Flap | Aerodynamics | The Active Gurney Flap (AGF) is a small, flat tab cyclically deployed and retracted at lower surface of the rotor blade near its trailing edge. It is expected that the device may improve performance of modern helicopters. The main goal of presented investigations was to develop research methodology and next to use it in studies on phenomena occurring in the flow around helicopter-rotor blades equipped with AGF. Conducted CFD simulations aimed at validation of the developed methodology as well as at significant supplementing and extension of results of experimental research. Simplified sensitivity analysis has been conducted aiming at determination of geometric and motion-control parameters of the AGF, optimal from point of view of helicopter-performance improvement. Fully three-dimensional simulations of the rotor flight aimed at determination of flight conditions, in which the use of Active Gurney Flaps could significantly improve the rotorcraft performance. | helicopter rotor blades active flow control Active Gurney Flap rotorcraft performance | 2018 | 1 | 250 | 98-118 | 10.2478/TAR-2018-0007 | Transactions on Aerospace Research |
| Marek Idzikowski, Wojciech Miksa | Ground and In-Fligh Testing of Cooling Efficiency of Turboprop Engine Compartment | Aerodynamics | This article presents selected results of I-31T propulsion tests, obtained in the framework of EU project ESPOSA (Efficient Systems and Propulsion for Small Aircraft). I-31T aircraft, as a testbed, was fitted with 180 kW turboprop engine TP100. The scope of the work include results of ground and in-flight tests of engine compartment cooling suitability. The purpose of the cooling tests was to prove that temperatures of the propulsion components are within limits set by the engine manufacturer for the engine type in the most disadvantageous conditions on the ground and in flight up to aircraft maximum altitude, maximum ambient temperature and after standard engine shutdown. Engine oil cooling is beyond the scope of this work. | light aircraft in-flight tests turboprop engine installation turboprop engine integration in airframe engine compartment cooling | 2018 | 1 | 250 | 17-25 | 10.2478/TAR-2018-0002 | Transactions on Aerospace Research |
| Krzysztof Szafran, Marcin Michalczyk | Various Types of the Rotorcraft Design in the Context of Aerospace Regulations | Aircraft design | In the next article on synthesis of regulations, the authors presented the general legal requirements for rotorcraft, which is limited to US regulations, because the vast majority of world regulations are based on them. The Institute of Aviation in Warsaw has developed requirements concerning the construction and operation of rotorcraft in Poland. These requirements constitute an important contribution to the regulations of the Civil Aviation Authority which are in force in the air space of the Republic of Poland. This paper presents the legal situation of rotorcraft and compares the requirements for helicopters and gyroplane. The conclusions highlighted the differences that arise from regulations between helicopters and rotorcraft. The authors have suggested the necessity to separate provisions for the group of windmills, which is implemented in the regulations of the Civil Aviation Authority. The presented work is the second of a planned series of publications in which authors intend to bring some of the issues to the reader about the design aspects of aircraft in selected global aviation regulations. | aviation regulations certification flight safety helicopters rotorcraft gyroplane | 2018 | 1 | 250 | 146-153 | 10.2478/TAR-2018-0010 | Transactions on Aerospace Research |
| Tomasz Seredyn, Adam Dziubiński, Piotr Jaśkowski | CFD Analysis of the Fluid Particles Distribution by Means of Aviation Technique | Aircraft operations | The article describes a computational study, using CFD models, of droplet spray dispersal in the wake of a ‘Turbo Kruk’ airplane up to 500 m downstream. The CFD Reynolds-averaged Navier-Stokes (RANS) models use a Lagrangian (droplet phase) and Eulerian (fluid phase) procedure to predict the droplet trajectories trough the turbulent aircraft wake. The methods described in the work have the potential to improve current models for aerial spraying and will help in the development of new spraying procedures. In this study, the CFD models are used to describe the phenomenon of sprays released from atomizers mounted on the plane. A parametric study of the aircraft model examines the effects of crosswind on the aircraft’s vortex structures and the resulting droplet trajectories. The study shows, that such influence is underestimated in the current models. A comparison of the present results to AGDISP predictions is provided. | Droplets dispersion modeling Pesticide spraying Agricultural aircraft wake | 2018 | 1 | 250 | 67-97 | 10.2478/TAR-2018-0006 | Transactions on Aerospace Research |
| Łukasz Kędzierski | Compressed Air Supply and Distribution System for Aviation Laboratories and Wind Tunnels | Experimental methods | The purpose of this text is to demonstrate an operation of a compressed air system designed for high air flow laboratories and wind tunnels. Development of such air system is a challenge due to unusual requirements (simultaneous supply of several users having different requirements and necessity to provide extremely high flows) which have to be address by means of adequate compressed air storage capacity and sophisticated control system. Each stage of the design process is going to be described, focusing on the selection of air compressors, air receivers and air dryers, followed by an insight into a development of the control system. The air system being described in this paper was successfully implemented at the Institute of Aviation in Warsaw improving the quality of the compressed air supply and simplifying the research planning. | compressed air laboratory wind tunnel | 2018 | 1 | 250 | 26-35 | 10.2478/TAR-2018-0003 | Transactions on Aerospace Research |
| Wit Stryczniewicz | Quantitative Visualisation of Compressible Flows | Experimental methods | The paper demonstrates the feasibility of quantitative flow visualisation methods for investigation of transonic and supersonic flows. Two methods and their application for retrieving compressible flow field properties has been described: Background Oriented Schlieren (BOS) and Particle Image Velocimetry (PIV). Recently introduced BOS technique extends the capabilities of classical Schlieren technique by use of digital image processing and allow to measure density gradients field. In the presented paper a review of applications of BOS technique has been presented. The PIV is well established technique for whole field velocity measurements. This paper presents application of PIV for determination of the shock wave position above airfoil in transonic flow regime. The study showed that application of quantitative flow visualisation techniques allows to gain new insights on the complex phenomenon of supersonic and transonic flow over airfoils like shock-boundary layer interaction and shock induced flow separation. | compressible fluid flow flow visualisation wind tunnel studies Particle Image Velocimetry Background Oriented Schlieren | 2018 | 1 | 250 | 137-145 | 10.2478/TAR-2018-0009 | Transactions on Aerospace Research |
| Marek Idzikowski, Wojciech Miksa | Ground and In-Fligh Testing of Cooling Efficiency of Turboprop Engine Compartment | Flight testing | This article presents selected results of I-31T propulsion tests, obtained in the framework of EU project ESPOSA (Efficient Systems and Propulsion for Small Aircraft). I-31T aircraft, as a testbed, was fitted with 180 kW turboprop engine TP100. The scope of the work include results of ground and in-flight tests of engine compartment cooling suitability. The purpose of the cooling tests was to prove that temperatures of the propulsion components are within limits set by the engine manufacturer for the engine type in the most disadvantageous conditions on the ground and in flight up to aircraft maximum altitude, maximum ambient temperature and after standard engine shutdown. Engine oil cooling is beyond the scope of this work. | light aircraft in-flight tests turboprop engine installation turboprop engine integration in airframe engine compartment cooling | 2018 | 1 | 250 | 17-25 | 10.2478/TAR-2018-0002 | Transactions on Aerospace Research |
| Sławomir Cieślak, Wiesław Krzymień | Drivetrain Noise of the Gyroplane I-28 | Noise | Gyroplanes, as ultralight aircraft, are popular transport vehicles recently. Ultralight aircraft flights take place at a low altitude – their noise is not without effect on people and nature. The localization of the sources of noise and a possibility to decrease the noise of an gyroplane are described in this paper. The rules of design and exploitation of gyroplanes do not define the limits of emitted noise. | gyroplane noise acoustic camera beamforming propeller noise | 2018 | 1 | 250 | 7-16 | 10.2478/TAR-2018-0001 | Transactions on Aerospace Research |
| Paweł Magryta, Konrad Pietrykowski, Michał Gęca | Thermodynamic Model of the ASz-62IR Radial Aircraft Engine | Propulsion | The article presents assumptions of the one-dimensional model of the ASz-62IR aircraft engine. This model was developed in the AVL BOOST software. The ASz-62IR is a nine cylinder, aircraft engine in a radial configuration. It is produced by the Polish company WSK “PZL-Kalisz” S. A. The model is used for calculating parameters of the fuel stream and the air stream in intake system of the engine, as well as for the analyses of the combustion process and the exhaust flow to the external environment. The model is based on the equations describing the isentropic flow. The geometry of the channels and all parts of the model has been mapped on the basis of empirical measurements of the engine elements. The model assumes indirect injection where the gasoline was used as a fuel with the calorific value of 43.5 MJ/kg. The model assumes a mixture of a stoichiometric ratio of 14.5. This model is only part of the overall the ASz-62IR engine model. After the simulation tests on the full model the obtained results confirmed the correctness of the model used to create the mixture. It was found that the AVL BOOST software is good for the implementation of this type of work. | aviation propulsion AVL BOOST engine model charge exchange mixture formation | 2018 | 1 | 250 | 36-48 | 10.2478/TAR-2018-0004 | Transactions on Aerospace Research |
| Marek Idzikowski, Wojciech Miksa | Ground and In-Fligh Testing of Cooling Efficiency of Turboprop Engine Compartment | Propulsion | This article presents selected results of I-31T propulsion tests, obtained in the framework of EU project ESPOSA (Efficient Systems and Propulsion for Small Aircraft). I-31T aircraft, as a testbed, was fitted with 180 kW turboprop engine TP100. The scope of the work include results of ground and in-flight tests of engine compartment cooling suitability. The purpose of the cooling tests was to prove that temperatures of the propulsion components are within limits set by the engine manufacturer for the engine type in the most disadvantageous conditions on the ground and in flight up to aircraft maximum altitude, maximum ambient temperature and after standard engine shutdown. Engine oil cooling is beyond the scope of this work. | light aircraft in-flight tests turboprop engine installation turboprop engine integration in airframe engine compartment cooling | 2018 | 1 | 250 | 17-25 | 10.2478/TAR-2018-0002 | Transactions on Aerospace Research |
| Jarosław Stanisławski | A Comparison of Helicopter Main Rotor Features due to Stiffness of Rotor Blade-Hub Connection | Rotorcraft technology | The paper presents results of simulation calculations concerning an influence of stiffness of blade-hub connection on rotor loads and blades deflections in hover, level flight and pull up maneuver. The three versions of rotor are considered with articulated, elastic and stiff connections of blades and hub. The blades with the same distributions of stiffness, mass and the same aerodynamic characteristics are applied for all rotor cases. The rotor loads are calculated applying Runge-Kutta method to solve the equations of motion of deformable blades. According to the Galerkin method, the parameters of blades motion are treated as combination of considered blade bending and torsion eigen modes. The results of calculations indicate for possibility to generate the greater rotor control moments and to improve helicopter maneuverability in the case of applying the non-changed blade of articulated rotor combined with elastic rotor hub. | helicopter main rotor blade deformations | 2018 | 1 | 250 | 119-136 | 10.2478/TAR-2018-0008 | Transactions on Aerospace Research |
| Krzysztof Szafran, Marcin Michalczyk | Various Types of the Rotorcraft Design in the Context of Aerospace Regulations | Rotorcraft technology | In the next article on synthesis of regulations, the authors presented the general legal requirements for rotorcraft, which is limited to US regulations, because the vast majority of world regulations are based on them. The Institute of Aviation in Warsaw has developed requirements concerning the construction and operation of rotorcraft in Poland. These requirements constitute an important contribution to the regulations of the Civil Aviation Authority which are in force in the air space of the Republic of Poland. This paper presents the legal situation of rotorcraft and compares the requirements for helicopters and gyroplane. The conclusions highlighted the differences that arise from regulations between helicopters and rotorcraft. The authors have suggested the necessity to separate provisions for the group of windmills, which is implemented in the regulations of the Civil Aviation Authority. The presented work is the second of a planned series of publications in which authors intend to bring some of the issues to the reader about the design aspects of aircraft in selected global aviation regulations. | aviation regulations certification flight safety helicopters rotorcraft gyroplane | 2018 | 1 | 250 | 146-153 | 10.2478/TAR-2018-0010 | Transactions on Aerospace Research |
| Sławomir Cieślak, Wiesław Krzymień | Drivetrain Noise of the Gyroplane I-28 | Rotorcraft technology | Gyroplanes, as ultralight aircraft, are popular transport vehicles recently. Ultralight aircraft flights take place at a low altitude – their noise is not without effect on people and nature. The localization of the sources of noise and a possibility to decrease the noise of an gyroplane are described in this paper. The rules of design and exploitation of gyroplanes do not define the limits of emitted noise. | gyroplane noise acoustic camera beamforming propeller noise | 2018 | 1 | 250 | 7-16 | 10.2478/TAR-2018-0001 | Transactions on Aerospace Research |
| Jan Muchowski, Marek Szumski, Andrzej Krzysiak | Aerodynamic Concept of the UAV in the Gyrodyne Configuration | Rotorcraft technology | The article presents an aerodynamic concept of UAV in the gyrodyne configuration, as a more efficient one than the currently used UAV airframe configuration applied for monitoring tasks of power lines and railway infrastructure. A sample task which is realised by conceptual gyrodyne based on monitoring aerial power lines was characterised and described. The assumed idea of UAV was shown in comparison to the currently used aircraft configuration presented in the introduction. Referring to momentum theory, hover efficiency of the multicopter and the helicopter was evaluated. In relation to the helicopter, an initial draft of the airframe conception accompanied by a description of advantages of the gyrodyne configuration was exposed. Problems related to the gyrodyne configuration were emphasised in the summary. | aerodynamic concept UAV VTOL gyrodyne airframe configuration | 2018 | 1 | 250 | 49-66 | 10.2478/TAR-2018-0005 | Transactions on Aerospace Research |
| Wieńczysław Stalewski | Flow Control on Helicopter – Rotor Blades via Active Gurney Flap | Rotorcraft technology | The Active Gurney Flap (AGF) is a small, flat tab cyclically deployed and retracted at lower surface of the rotor blade near its trailing edge. It is expected that the device may improve performance of modern helicopters. The main goal of presented investigations was to develop research methodology and next to use it in studies on phenomena occurring in the flow around helicopter-rotor blades equipped with AGF. Conducted CFD simulations aimed at validation of the developed methodology as well as at significant supplementing and extension of results of experimental research. Simplified sensitivity analysis has been conducted aiming at determination of geometric and motion-control parameters of the AGF, optimal from point of view of helicopter-performance improvement. Fully three-dimensional simulations of the rotor flight aimed at determination of flight conditions, in which the use of Active Gurney Flaps could significantly improve the rotorcraft performance. | helicopter rotor blades active flow control Active Gurney Flap rotorcraft performance | 2018 | 1 | 250 | 98-118 | 10.2478/TAR-2018-0007 | Transactions on Aerospace Research |
| Sławomir Cieślak, Wiesław Krzymień, Krzysztof Szafran | Acoustic Characteristics of the Cabin of the Research Platform on the Airbag IL-PRC-600M | Acoustics | Hovercrafts are a universal means of transport intended for use on flat surfaces such as water, ice, snow, swamp, or sand. They are used in rescue operations and patrolling difficult areas inaccessible to other means of transport. The Institute of Aviation conducted acoustic measurements inside the cabin of the hovercraft to determine the source of the noise and the sound pressure exerted on the pilot and passengers. Assessment of the sources of noise in the cabin is made using the acoustic beamforming method. Assessment of the level of noise to which a pilot is exposed during the operation was prepared on the basis of a standard specifying the requirements and methods of determining occupational noise exposure [1]. | noise acoustics acoustic beamforming hovercraft cabin | 2018 | 2 | 251 | 16-23 | 10.2478/TAR-2018-0012 | Transactions on Aerospace Research |
| Stanisław Popowski, Witold Dąbrowski | Analysis of Methods Used to Eliminate the Propeller Slipstream Effect in Single-Engine Aircraft | Aerodynamics | Propeller-driven single-engine aircraft are affected by unsymmetrical flow of air around the fuse-lage, and especially around the vertical stabilizer [1-3]. This unsymmetrical, propeller-induced slip-stream produces sideslip [4,5] that needs to be compensated by the pilot using the rudder [6]. In order to relieve the pilot from this additional task, automatic rudder deflection systems are used that compensate for sideslip by trimming the rudder accordingly. Such compensation algorithms are based on flight parameter measurements. | single-engine aircraft propeller slipstream sideslip angle | 2018 | 2 | 251 | 51-59 | 10.2478/TAR-2018-0015 | Transactions on Aerospace Research |
| Robert Konieczka | Mi-2 Helicopters Used within the Structures of the Aviation Detachment of the Ministry of Interior | Aircraft operations | In the article, the author presents the wide-scale use of Mi-2 helicopters in the different entities subordinated to the Minister of Interior - from the introduction of the design, until the present. Insights are presented pertaining to the early stages of the helicopter’s service life within the structures of the 103rd NJW MSW Aviation Regiment in the 1960s. The article describes selected aspects related to the introduction of the design, training, operational use and problems encountered. The service life of Mi-2 helicopters operating within the structures of the Ministry of Interior ended upon liquidation of the Ministry’s Aviation Detachment. That is when another chapter in the history of the helicopters was started, this time operated within the structures of the Police and Border Guard forces, where their service life has not been fully used up until this day. The paper describes the reality of every-day use to perform specific tasks, presents the location of aerodromes, touches upon a shift in the philosophy behind the use of the helicopters, and describes their strong and weak points. The PZL-Kania helicopter has been also presented, being a modernized version of the Mi-2, and still used in Poland within the aviation forces of the Ministry of Interior and Administration. | Ministry of Interior and Administration Mi-2 helicopter public safety Nadwiślańskie Jednostki Wojskowe Border Guard Police | 2018 | 2 | 251 | 34-50 | 10.2478/TAR-2018-0014 | Transactions on Aerospace Research |
| Miłosz Rusiecki | Mi-2 Helicopters Operating at Sea | Aircraft operations | The article describes participation of Mi-2 helicopters in both military and civilian operations at sea. Although the multipurpose Mi-2 rotorcraft were not designed to operate in the harsh environment over the sea, they became - in the second half of the 1960s and in the 1970s - a standard type performing a wide array of tasks at sea. Modern turboshaft engines, a favorable weight-to-power ratio and a dual engine configuration were all factors enabling safe flight over the sea, at considerable distances from land. The specialized Mi-2RM variant designed by WSK PZL Świdnik provided the Naval Aviation with an opportunity to establish, in the 1st half of the 1970s, a unique marine air rescue system. The last Mi-2RM used for rescue missions was decommissioned as late as in 2010, although at that stage it was only used for aircrew training purposes. The Navy was also using the Mi-2Ch variant tasked with creating smokescreens to conceal vessels and port facilities. General purpose variants of the helicopter were used to transport people and goods. They also performed well during patrolling missions and while identifying various types of contamination. | helicopters sea operations Mi-2 versions military and civilian use of the Mi-2 helicopter | 2018 | 2 | 251 | 60-76 | 10.2478/TAR-2018-0016 | Transactions on Aerospace Research |
| Piotr Bajurko, Przemysław Dobrzański | Experimental Verification of Numerical Calculations with the Use of Digital Image Correlation | COMPOSITE MATERIALS | The article presents the results of research work performed under the TEBUK project, aiming primarily to develop a reference methodology for assessing the impact of damage on the strength of structures made of carbon epoxy prepregs. The tests described in the paper were concerned with a fragment of the structure (FS) of the TEBUK project demonstrator, made of carbon epoxy composite, with an artificial circular delamination measuring 40 mm in diameter. Numerical and experimental test of FS have been performed under quasi-static compression load. The buckling of the skin observed in the delamination area, as well as the propagation of the latter were investigated. The numerical calculations have been performed with the use of the commercially available MSC Marc/Mentat calculation suite based on the Finite Elements Methods. Results of the numerical calculations have been compared with experimental measurements made with the use of the Digital Image Correlation (DIC) method. The tests performed aimed to provide a preliminary verification of the numerical model. The results obtained have shown a very good correlation between the numerical and experimental results concerned with critical load levels at which stability of the layers separated by delamination is lost (buckling). The lack of convergence of the numerical model’s results after exceeding the critical load values has rendered it impossible to unequivocally compare the results concerned with propagation of the delamination area. | digital image correlation FEM delamination buckling carbon-epoxy laminate | 2018 | 2 | 251 | 1-15 | 10.2478/TAR-2018-0011 | Transactions on Aerospace Research |
| Robert Jaśkiewicz | Implementation of Automatic Sample and Composite Element Cutting Technologies | COMPOSITE MATERIALS | The article presents the methodology of introducing automatic carbon fiber panel cutting technologies at the Composite Testing Laboratory of the Institute of Aviation. It describes the process of implementing the new cutting technology which boosts the efficiency of preparing composite samples for strength testing, with the requirements applicable to edge smoothness and dimension tolerances taken into consideration. It also reviews the literature concerned with three most popular composite material cutting methods: laser cutting, abrasive water jet cutting and machining, presenting the strong and the weak points of each one of them. After selecting the machining technology relying on a disc, cutting tests have been performed. Cutting discs coated with diamond particles, and carbon fiber panels were used during the tests. The tests were performed with the use of the INFOTEC CNC machine, with an adapter enabling the installation of cutting discs with the maximum diameter of 150 mm. | composite cutting automatic cutting CNC cutting carbon fiber machining | 2018 | 2 | 251 | 24-33 | 10.2478/TAR-2018-0013 | Transactions on Aerospace Research |
| Piotr Bajurko, Przemysław Dobrzański | Experimental Verification of Numerical Calculations with the Use of Digital Image Correlation | COMPOSITE STRUCTURES | The article presents the results of research work performed under the TEBUK project, aiming primarily to develop a reference methodology for assessing the impact of damage on the strength of structures made of carbon epoxy prepregs. The tests described in the paper were concerned with a fragment of the structure (FS) of the TEBUK project demonstrator, made of carbon epoxy composite, with an artificial circular delamination measuring 40 mm in diameter. Numerical and experimental test of FS have been performed under quasi-static compression load. The buckling of the skin observed in the delamination area, as well as the propagation of the latter were investigated. The numerical calculations have been performed with the use of the commercially available MSC Marc/Mentat calculation suite based on the Finite Elements Methods. Results of the numerical calculations have been compared with experimental measurements made with the use of the Digital Image Correlation (DIC) method. The tests performed aimed to provide a preliminary verification of the numerical model. The results obtained have shown a very good correlation between the numerical and experimental results concerned with critical load levels at which stability of the layers separated by delamination is lost (buckling). The lack of convergence of the numerical model’s results after exceeding the critical load values has rendered it impossible to unequivocally compare the results concerned with propagation of the delamination area. | digital image correlation FEM delamination buckling carbon-epoxy laminate | 2018 | 2 | 251 | 1-15 | 10.2478/TAR-2018-0011 | Transactions on Aerospace Research |
| Robert Jaśkiewicz | Implementation of Automatic Sample and Composite Element Cutting Technologies | COMPOSITE STRUCTURES | The article presents the methodology of introducing automatic carbon fiber panel cutting technologies at the Composite Testing Laboratory of the Institute of Aviation. It describes the process of implementing the new cutting technology which boosts the efficiency of preparing composite samples for strength testing, with the requirements applicable to edge smoothness and dimension tolerances taken into consideration. It also reviews the literature concerned with three most popular composite material cutting methods: laser cutting, abrasive water jet cutting and machining, presenting the strong and the weak points of each one of them. After selecting the machining technology relying on a disc, cutting tests have been performed. Cutting discs coated with diamond particles, and carbon fiber panels were used during the tests. The tests were performed with the use of the INFOTEC CNC machine, with an adapter enabling the installation of cutting discs with the maximum diameter of 150 mm. | composite cutting automatic cutting CNC cutting carbon fiber machining | 2018 | 2 | 251 | 24-33 | 10.2478/TAR-2018-0013 | Transactions on Aerospace Research |
| Piotr Bajurko, Przemysław Dobrzański | Experimental Verification of Numerical Calculations with the Use of Digital Image Correlation | COMPOSITES | The article presents the results of research work performed under the TEBUK project, aiming primarily to develop a reference methodology for assessing the impact of damage on the strength of structures made of carbon epoxy prepregs. The tests described in the paper were concerned with a fragment of the structure (FS) of the TEBUK project demonstrator, made of carbon epoxy composite, with an artificial circular delamination measuring 40 mm in diameter. Numerical and experimental test of FS have been performed under quasi-static compression load. The buckling of the skin observed in the delamination area, as well as the propagation of the latter were investigated. The numerical calculations have been performed with the use of the commercially available MSC Marc/Mentat calculation suite based on the Finite Elements Methods. Results of the numerical calculations have been compared with experimental measurements made with the use of the Digital Image Correlation (DIC) method. The tests performed aimed to provide a preliminary verification of the numerical model. The results obtained have shown a very good correlation between the numerical and experimental results concerned with critical load levels at which stability of the layers separated by delamination is lost (buckling). The lack of convergence of the numerical model’s results after exceeding the critical load values has rendered it impossible to unequivocally compare the results concerned with propagation of the delamination area. | digital image correlation FEM delamination buckling carbon-epoxy laminate | 2018 | 2 | 251 | 1-15 | 10.2478/TAR-2018-0011 | Transactions on Aerospace Research |
| Robert Jaśkiewicz | Implementation of Automatic Sample and Composite Element Cutting Technologies | COMPOSITES | The article presents the methodology of introducing automatic carbon fiber panel cutting technologies at the Composite Testing Laboratory of the Institute of Aviation. It describes the process of implementing the new cutting technology which boosts the efficiency of preparing composite samples for strength testing, with the requirements applicable to edge smoothness and dimension tolerances taken into consideration. It also reviews the literature concerned with three most popular composite material cutting methods: laser cutting, abrasive water jet cutting and machining, presenting the strong and the weak points of each one of them. After selecting the machining technology relying on a disc, cutting tests have been performed. Cutting discs coated with diamond particles, and carbon fiber panels were used during the tests. The tests were performed with the use of the INFOTEC CNC machine, with an adapter enabling the installation of cutting discs with the maximum diameter of 150 mm. | composite cutting automatic cutting CNC cutting carbon fiber machining | 2018 | 2 | 251 | 24-33 | 10.2478/TAR-2018-0013 | Transactions on Aerospace Research |
| Wojciech Zdrojewski | Measuring Stand Tests of a Michell-Banki Water Turbine Prototype,Performed under Natural Conditions | Hydrodynamics | The article presents the result of tests of a single segment of a prototype water turbine, performed in order to determine its shaft power output as a function of rpm, and to verify the declared performance. The results have been compared with the outcomes of numerical calculations performed, for the same conditions, with the use of FLUENT software. The work presents information of crucial importance for presenting the process of testing the piece in question, such as: test environment, properties of the test piece, testing equipment used, as well as the methodology and the course of hydromechanical measurements, along with the characteristics of the results obtained. Then, the measurement results are discussed and analyzed. Conclusions are presented as well. Analysis of the results, taking into consideration the physical image of phenomena occurring in the case of flow-devices, such as water turbines, has made it possible to define other, important characteristics of the turbine, such as: output, shaft torque and efficiency, as a function of rpm and head of turbine. Test results have confirmed the expected mechanical and power-related properties of the turbine and have proved the numerical flow modeling model used effective. | turbine geometry hydromechanical measurements water head shaft power output flow rate turbine efficiency | 2018 | 2 | 251 | 77-95 | 10.2478/TAR-2018-0017 | Transactions on Aerospace Research |
| Sławomir Cieślak, Wiesław Krzymień, Krzysztof Szafran | Acoustic Characteristics of the Cabin of the Research Platform on the Airbag IL-PRC-600M | Noise | Hovercrafts are a universal means of transport intended for use on flat surfaces such as water, ice, snow, swamp, or sand. They are used in rescue operations and patrolling difficult areas inaccessible to other means of transport. The Institute of Aviation conducted acoustic measurements inside the cabin of the hovercraft to determine the source of the noise and the sound pressure exerted on the pilot and passengers. Assessment of the sources of noise in the cabin is made using the acoustic beamforming method. Assessment of the level of noise to which a pilot is exposed during the operation was prepared on the basis of a standard specifying the requirements and methods of determining occupational noise exposure [1]. | noise acoustics acoustic beamforming hovercraft cabin | 2018 | 2 | 251 | 16-23 | 10.2478/TAR-2018-0012 | Transactions on Aerospace Research |
| Robert Konieczka | Mi-2 Helicopters Used within the Structures of the Aviation Detachment of the Ministry of Interior | Rotorcraft operations | In the article, the author presents the wide-scale use of Mi-2 helicopters in the different entities subordinated to the Minister of Interior - from the introduction of the design, until the present. Insights are presented pertaining to the early stages of the helicopter’s service life within the structures of the 103rd NJW MSW Aviation Regiment in the 1960s. The article describes selected aspects related to the introduction of the design, training, operational use and problems encountered. The service life of Mi-2 helicopters operating within the structures of the Ministry of Interior ended upon liquidation of the Ministry’s Aviation Detachment. That is when another chapter in the history of the helicopters was started, this time operated within the structures of the Police and Border Guard forces, where their service life has not been fully used up until this day. The paper describes the reality of every-day use to perform specific tasks, presents the location of aerodromes, touches upon a shift in the philosophy behind the use of the helicopters, and describes their strong and weak points. The PZL-Kania helicopter has been also presented, being a modernized version of the Mi-2, and still used in Poland within the aviation forces of the Ministry of Interior and Administration. | Ministry of Interior and Administration Mi-2 helicopter public safety Nadwiślańskie Jednostki Wojskowe Border Guard Police | 2018 | 2 | 251 | 34-50 | 10.2478/TAR-2018-0014 | Transactions on Aerospace Research |
| Miłosz Rusiecki | Mi-2 Helicopters Operating at Sea | Rotorcraft operations | The article describes participation of Mi-2 helicopters in both military and civilian operations at sea. Although the multipurpose Mi-2 rotorcraft were not designed to operate in the harsh environment over the sea, they became - in the second half of the 1960s and in the 1970s - a standard type performing a wide array of tasks at sea. Modern turboshaft engines, a favorable weight-to-power ratio and a dual engine configuration were all factors enabling safe flight over the sea, at considerable distances from land. The specialized Mi-2RM variant designed by WSK PZL Świdnik provided the Naval Aviation with an opportunity to establish, in the 1st half of the 1970s, a unique marine air rescue system. The last Mi-2RM used for rescue missions was decommissioned as late as in 2010, although at that stage it was only used for aircrew training purposes. The Navy was also using the Mi-2Ch variant tasked with creating smokescreens to conceal vessels and port facilities. General purpose variants of the helicopter were used to transport people and goods. They also performed well during patrolling missions and while identifying various types of contamination. | helicopters sea operations Mi-2 versions military and civilian use of the Mi-2 helicopter | 2018 | 2 | 251 | 60-76 | 10.2478/TAR-2018-0016 | Transactions on Aerospace Research |
| Ewelina Kluska, Piotr Gruda, Natalia Majca-Nowak | Strain optical analysis of 3d printing elements in different additive technologies in comparison with the finite element method | 3D printing | Research included in this article were conducted with a project: ‘Additive technology used in conduction with optical methods for rapid prototyping of 3D printed models’. In this article intellectualized three various 3D printing technologies: Fused Deposition Modelling (FDM), Selective Laser Sintering (SLS) and Material Jetting (PolyJet). Also, there was presented theory of Digital Image Correlation (DIC) as an optical method for strain analysis. The limitations of DIC system have been tested and detected. The test result for DIC system were shown for each method of additive technologies and the results were compared to Finite Element Method (FEM). Test specimens were printed in selected technologies for reference. DIC system has been used for displacement state in loaded objects. The last paragraph contains both summary and tests results. | Additive technology 3D printing digital image correlation finite element method | 2018 | 3 | 252 | 49-68 | 10.2478/TAR-2018-0022 | Transactions on Aerospace Research |
| Ewelina Kluska, Piotr Gruda, Natalia Majca-Nowak | The accuracy and the printing resolution comparison of different 3D printing technologies | 3D printing | The article presents a research conducted with the project: ‘Additive technology used in conduction with optical methods for rapid prototyping of 3D printed models’ [13]. In this article selected three different 3D printing technologies: Fused Deposition Modeling (FDM), Selective Laser Sintering (SLS) and Material Jetting (MJ). Each of them was tested paying special attention to accuracy and resolution of printed elements. Accuracy tests were conducted on the reference specimens which also showed material texture. These specimens were scanned to verified dimensional deviations of printing methods. Printing resolution was verified on a heat exchanger model which was characterized by complicated structure. The highest accuracy and printing resolution was noticed in the MJ technology, PolyJet method on the Objet Eden 260 VS printing machine and the SUP 707 water soluble support material. | 3D printing accuracy printing resolution complicated shapes | 2018 | 3 | 252 | 69-86 | 10.2478/TAR-2018-0023 | Transactions on Aerospace Research |
| Michał Gęca, Konrad Pietrykowski, Karol Rosiński | The Research of Acoustic Emission of a Low-Power Aircraft Engine | Acoustics | This paper presents the methodology and investigation of the sound power level produced by a radial piston aircraft engine operating at varied speeds. The research model aircraft engine of a maximum power of 5.5 kW with a two-bladed airscrew was placed on a test bend. Its sound power level was calculated from the sound pressure level measured at 9 measurement points distributed on a hemispherical surface in a confined space in line with PN-EN 3744. Mean sound power generated by the ASP FS400AR engine is 96 dB at idle (2,880 rpm) and 105 dB at a cruising speed (4,740 rpm). Accordingly, it can be concluded that a sound level meter registered a higher sound power level at the points in front of the model aircraft engine than at the points behind it, whereas the lowest sound power level was registered directly above the engine. | model aircraft engine aerospace propulsion systems sound power noise | 2018 | 3 | 252 | 14-25 | 10.2478/TAR-2018-0019 | Transactions on Aerospace Research |
| Ewelina Kluska, Piotr Gruda, Natalia Majca-Nowak | Strain optical analysis of 3d printing elements in different additive technologies in comparison with the finite element method | Additive manufacrturing | Research included in this article were conducted with a project: ‘Additive technology used in conduction with optical methods for rapid prototyping of 3D printed models’. In this article intellectualized three various 3D printing technologies: Fused Deposition Modelling (FDM), Selective Laser Sintering (SLS) and Material Jetting (PolyJet). Also, there was presented theory of Digital Image Correlation (DIC) as an optical method for strain analysis. The limitations of DIC system have been tested and detected. The test result for DIC system were shown for each method of additive technologies and the results were compared to Finite Element Method (FEM). Test specimens were printed in selected technologies for reference. DIC system has been used for displacement state in loaded objects. The last paragraph contains both summary and tests results. | Additive technology 3D printing digital image correlation finite element method | 2018 | 3 | 252 | 49-68 | 10.2478/TAR-2018-0022 | Transactions on Aerospace Research |
| Ewelina Kluska, Piotr Gruda, Natalia Majca-Nowak | The accuracy and the printing resolution comparison of different 3D printing technologies | Additive manufacrturing | The article presents a research conducted with the project: ‘Additive technology used in conduction with optical methods for rapid prototyping of 3D printed models’ [13]. In this article selected three different 3D printing technologies: Fused Deposition Modeling (FDM), Selective Laser Sintering (SLS) and Material Jetting (MJ). Each of them was tested paying special attention to accuracy and resolution of printed elements. Accuracy tests were conducted on the reference specimens which also showed material texture. These specimens were scanned to verified dimensional deviations of printing methods. Printing resolution was verified on a heat exchanger model which was characterized by complicated structure. The highest accuracy and printing resolution was noticed in the MJ technology, PolyJet method on the Objet Eden 260 VS printing machine and the SUP 707 water soluble support material. | 3D printing accuracy printing resolution complicated shapes | 2018 | 3 | 252 | 69-86 | 10.2478/TAR-2018-0023 | Transactions on Aerospace Research |
| Łukasz Jeziorek, Patryk Widera | Temperature measurements using thermal sensitive paint | Aerodynamics | Article highlights practical issues concerning temperature measurements using thermal sensitive paint (abbrev. TSP). TSP paint after blue light excitation emits red light with intensity dependent on its temperature. Temperature measurements are preceded with paint calibration, according to exact experiment conditions. Purpose of calibration is to find transfer function between intensity of emitted radiation and surface temperature. To achieve this goal, special computational procedure is implemented. Devices and methodology used for paint calibration are briefly described as well as measuring sample preparation process. Short description is devoted to the procedure for calculation temperature using recorded intensity. Results obtained during calibration are presented. Final conclusions about perspective of using thermal sensitive paint in laboratory are presented, as well as advantages and disadvantages of TSP method versus other methods currently used in temperature measurements. | Thermal sensitive paint TSP temperature measurement | 2018 | 3 | 252 | 37-48 | 10.2478/TAR-2018-0021 | Transactions on Aerospace Research |
| Paweł Skalski | Bionics in aviation | Bioinspiration | In the paper bionics as a field of knowledge and inspiration in the aviation technologies is presented. Bionics is a branch of science on the borderline of art and biology that studies the way living organisms work, as well as their structure, in order to use the results to build technical devices. In the introduction part definition of bionics is described. In the next part of this document the aviation technologies inspired by nature is depicted. Then, technologies inspired by the butterfly wing are presented. The paper ends with conclusions. | bionics aviation butterfly wing | 2018 | 3 | 252 | 103-113 | 10.2478/TAR-2018-0025 | Transactions on Aerospace Research |
| Przemysław Dobrzański | Bonding of High Temperature Thermoplastic Carbon Composites with Resistance Welding Technique | COMPOSITE MATERIALS | The article presents ‘state-of-the art’ on joining fibre reinforced thermoplastic composites with the use of resistance welding technique. Their welding process and potential difficulties connected with the process and quality control of a manufactured element are presented. The structure of a typical thermoplastic composite welding stand was also presented. The main welding technology elements were characterized: structure of the resistance element, implementation of the thermal process and pressure application required for joining materials. The paper also presents the required calibration ranges for a technological process with the use of strength test types SLS, DCB, SBS and nondestructive testing of joint with the ultrasonic method. | thermoplastic composites resistance welding joining thermoplastic composites | 2018 | 3 | 252 | 1-13 | 10.2478/TAR-2018-0018 | Transactions on Aerospace Research |
| Przemysław Dobrzański | Bonding of High Temperature Thermoplastic Carbon Composites with Resistance Welding Technique | COMPOSITE STRUCTURES | The article presents ‘state-of-the art’ on joining fibre reinforced thermoplastic composites with the use of resistance welding technique. Their welding process and potential difficulties connected with the process and quality control of a manufactured element are presented. The structure of a typical thermoplastic composite welding stand was also presented. The main welding technology elements were characterized: structure of the resistance element, implementation of the thermal process and pressure application required for joining materials. The paper also presents the required calibration ranges for a technological process with the use of strength test types SLS, DCB, SBS and nondestructive testing of joint with the ultrasonic method. | thermoplastic composites resistance welding joining thermoplastic composites | 2018 | 3 | 252 | 1-13 | 10.2478/TAR-2018-0018 | Transactions on Aerospace Research |
| Przemysław Dobrzański | Bonding of High Temperature Thermoplastic Carbon Composites with Resistance Welding Technique | COMPOSITES | The article presents ‘state-of-the art’ on joining fibre reinforced thermoplastic composites with the use of resistance welding technique. Their welding process and potential difficulties connected with the process and quality control of a manufactured element are presented. The structure of a typical thermoplastic composite welding stand was also presented. The main welding technology elements were characterized: structure of the resistance element, implementation of the thermal process and pressure application required for joining materials. The paper also presents the required calibration ranges for a technological process with the use of strength test types SLS, DCB, SBS and nondestructive testing of joint with the ultrasonic method. | thermoplastic composites resistance welding joining thermoplastic composites | 2018 | 3 | 252 | 1-13 | 10.2478/TAR-2018-0018 | Transactions on Aerospace Research |
| Łukasz Jeziorek, Patryk Widera | Temperature measurements using thermal sensitive paint | Experimental methods | Article highlights practical issues concerning temperature measurements using thermal sensitive paint (abbrev. TSP). TSP paint after blue light excitation emits red light with intensity dependent on its temperature. Temperature measurements are preceded with paint calibration, according to exact experiment conditions. Purpose of calibration is to find transfer function between intensity of emitted radiation and surface temperature. To achieve this goal, special computational procedure is implemented. Devices and methodology used for paint calibration are briefly described as well as measuring sample preparation process. Short description is devoted to the procedure for calculation temperature using recorded intensity. Results obtained during calibration are presented. Final conclusions about perspective of using thermal sensitive paint in laboratory are presented, as well as advantages and disadvantages of TSP method versus other methods currently used in temperature measurements. | Thermal sensitive paint TSP temperature measurement | 2018 | 3 | 252 | 37-48 | 10.2478/TAR-2018-0021 | Transactions on Aerospace Research |
| Marek Idzikowski, Wojciech Miksa | Flight tests of turboprop engine with reverse air intake system | Flight tests | This work presents selected results of I-31T propulsion flight tests, obtained in the framework of ESPOSA (Efficient Systems and Propulsion for Small Aircraft) project. I-31T test platform was equipped with TP100, a 180 kW turboprop engine. Engine installation design include reverse flow inlet and separator, controlled from the cockpit, that limited ingestion of solid particulates during ground operations. The flight tests verified proper air feed to the engine with the separator turned on and off. The carried out investigation of the intake system excluded possibility of hazardous engine operation, such as compressor stall, surge or flameout and potential airflow disturbance causing damaging vibration of the engine body. Finally, we present evaluation of total power losses associated with engine integration with the airframe. | light aircraft flight tests turboprop engine installation turboprop engine integration reverse air flow to engine | 2018 | 3 | 252 | 26-36 | 10.2478/TAR-2018-0020 | Transactions on Aerospace Research |
| Przemysław Dobrzański | Bonding of High Temperature Thermoplastic Carbon Composites with Resistance Welding Technique | Manufacturing | The article presents ‘state-of-the art’ on joining fibre reinforced thermoplastic composites with the use of resistance welding technique. Their welding process and potential difficulties connected with the process and quality control of a manufactured element are presented. The structure of a typical thermoplastic composite welding stand was also presented. The main welding technology elements were characterized: structure of the resistance element, implementation of the thermal process and pressure application required for joining materials. The paper also presents the required calibration ranges for a technological process with the use of strength test types SLS, DCB, SBS and nondestructive testing of joint with the ultrasonic method. | thermoplastic composites resistance welding joining thermoplastic composites | 2018 | 3 | 252 | 1-13 | 10.2478/TAR-2018-0018 | Transactions on Aerospace Research |
| Michał Gęca, Konrad Pietrykowski, Karol Rosiński | The Research of Acoustic Emission of a Low-Power Aircraft Engine | Noise | This paper presents the methodology and investigation of the sound power level produced by a radial piston aircraft engine operating at varied speeds. The research model aircraft engine of a maximum power of 5.5 kW with a two-bladed airscrew was placed on a test bend. Its sound power level was calculated from the sound pressure level measured at 9 measurement points distributed on a hemispherical surface in a confined space in line with PN-EN 3744. Mean sound power generated by the ASP FS400AR engine is 96 dB at idle (2,880 rpm) and 105 dB at a cruising speed (4,740 rpm). Accordingly, it can be concluded that a sound level meter registered a higher sound power level at the points in front of the model aircraft engine than at the points behind it, whereas the lowest sound power level was registered directly above the engine. | model aircraft engine aerospace propulsion systems sound power noise | 2018 | 3 | 252 | 14-25 | 10.2478/TAR-2018-0019 | Transactions on Aerospace Research |
| Marek Idzikowski, Wojciech Miksa | Flight tests of turboprop engine with reverse air intake system | Propulsion | This work presents selected results of I-31T propulsion flight tests, obtained in the framework of ESPOSA (Efficient Systems and Propulsion for Small Aircraft) project. I-31T test platform was equipped with TP100, a 180 kW turboprop engine. Engine installation design include reverse flow inlet and separator, controlled from the cockpit, that limited ingestion of solid particulates during ground operations. The flight tests verified proper air feed to the engine with the separator turned on and off. The carried out investigation of the intake system excluded possibility of hazardous engine operation, such as compressor stall, surge or flameout and potential airflow disturbance causing damaging vibration of the engine body. Finally, we present evaluation of total power losses associated with engine integration with the airframe. | light aircraft flight tests turboprop engine installation turboprop engine integration reverse air flow to engine | 2018 | 3 | 252 | 26-36 | 10.2478/TAR-2018-0020 | Transactions on Aerospace Research |
| Patryk Palej, Tomasz Palacz | Preliminary design analysis of regenerative cooling for N2O/Alkohol small scale liquid rocket engine | Propulsion | This paper presents a concept of a small scale liquid-propellant rocket engine designed in AGH Space Systems for sounding rocket. During preliminary design of thermal aspects various ways of cooling were evaluated and described. Possible issues and design approaches for ablative, radiation and regenerative cooling are raised. The authors describe available solutions. Regenerative cooling is especially concerned as it is most popular solution in bi-liquid engines, in which alcohol fuel acts as coolant and is preheated before it reaches combustion chamber. To estimate a possible temperature distribution - and thus an applicability of such a system in the engine - a mathematical model of heat transfer was developed. Unique element of said engine is its oxidizer - nitrous oxide, which have been rarely used to date. Comparison between typical LOX bi-liquids is given and major differences that affect cooling arrangement are discussed. The authors compared different combinations of coolants, fuel/oxidizer ratios etc. to optimize the temperature distribution which is a key factor for the engine performance. | liquid rocket engine regenerative cooling nitrous oxide sounding rocket | 2018 | 3 | 252 | 87-102 | 10.2478/TAR-2018-0024 | Transactions on Aerospace Research |
| Patryk Palej, Tomasz Palacz | Preliminary design analysis of regenerative cooling for N2O/Alkohol small scale liquid rocket engine | Regenerative coolinf | This paper presents a concept of a small scale liquid-propellant rocket engine designed in AGH Space Systems for sounding rocket. During preliminary design of thermal aspects various ways of cooling were evaluated and described. Possible issues and design approaches for ablative, radiation and regenerative cooling are raised. The authors describe available solutions. Regenerative cooling is especially concerned as it is most popular solution in bi-liquid engines, in which alcohol fuel acts as coolant and is preheated before it reaches combustion chamber. To estimate a possible temperature distribution - and thus an applicability of such a system in the engine - a mathematical model of heat transfer was developed. Unique element of said engine is its oxidizer - nitrous oxide, which have been rarely used to date. Comparison between typical LOX bi-liquids is given and major differences that affect cooling arrangement are discussed. The authors compared different combinations of coolants, fuel/oxidizer ratios etc. to optimize the temperature distribution which is a key factor for the engine performance. | liquid rocket engine regenerative cooling nitrous oxide sounding rocket | 2018 | 3 | 252 | 87-102 | 10.2478/TAR-2018-0024 | Transactions on Aerospace Research |
| Patryk Palej, Tomasz Palacz | Preliminary design analysis of regenerative cooling for N2O/Alkohol small scale liquid rocket engine | Space technology | This paper presents a concept of a small scale liquid-propellant rocket engine designed in AGH Space Systems for sounding rocket. During preliminary design of thermal aspects various ways of cooling were evaluated and described. Possible issues and design approaches for ablative, radiation and regenerative cooling are raised. The authors describe available solutions. Regenerative cooling is especially concerned as it is most popular solution in bi-liquid engines, in which alcohol fuel acts as coolant and is preheated before it reaches combustion chamber. To estimate a possible temperature distribution - and thus an applicability of such a system in the engine - a mathematical model of heat transfer was developed. Unique element of said engine is its oxidizer - nitrous oxide, which have been rarely used to date. Comparison between typical LOX bi-liquids is given and major differences that affect cooling arrangement are discussed. The authors compared different combinations of coolants, fuel/oxidizer ratios etc. to optimize the temperature distribution which is a key factor for the engine performance. | liquid rocket engine regenerative cooling nitrous oxide sounding rocket | 2018 | 3 | 252 | 87-102 | 10.2478/TAR-2018-0024 | Transactions on Aerospace Research |
| Łukasz Jeziorek, Krzysztof Szafran, Paweł Skalski | Heat Transfer Determined by the Temperature Sensitive Paint Method | Aerodynamics | The paper presents practical aspects of determining the amount of heat flow by measuring the distribution of surface temperature using the Temperature Sensitive Paint (TSP) method. The quantity measured directly with TSP is the intensity of the excited radiation, which is then converted to surface temperature. The article briefly presents three different methods for determining the heat transfer coefficient. Each of these methods is based on a separate set of assumptions and significantly influences the construction of the measuring station. The advantages of each of the presented methods are their individual properties, allowing to improve accuracy, reduce the cost of testing or the possibility of using them in tests of highly complex objects. For each method a mathematical model used to calculate the heat transfer coefficient is presented. For the steady state heat transfer test method that uses a heater of constant and known thermal power, examples of the results of our own research are presented, together with a comparison of the results with available data and a discussion of the accuracy of the results obtained. | temperature sensitive paint TSP temperature measurement heat transfer coefficient HTC | 2018 | 4 | 253 | 45-57 | 10.2478/TAR-2018-0029 | Transactions on Aerospace Research |
| William J. Deitrick, Wit Stryczniewicz | Development and Testing of Data Reduction Software for Measurements Using Pressure Sensitive Paints | Aerodynamics | The paper concentrates on post-processing of data necessary for pressure measurements using Pressure Sensitive Paints (PSP). The purpose of the study was to develop and test procedures for extraction of the surface pressure distribution from the images captured during PSP tests. The core issues addressed were reduction of the influence of model movement and deformation during wind tunnel run and synchronization between conventional pressure tap measurements and PSP data, necessary for in-situ calibration. In the course of the studies, two approaches on image registration were proposed: the first based on geometric transformation of control points pairs with cross-correlation tuning and the second based on similarity finding and estimation of geometric transformation of the images. Performance of the developed algorithm was tested with use of experimental set-up allowing for controlled movement of the imagined target with micrometer resolution. Both of the proposed approaches to PSP image resection proved to perform well. After testing of the software, the PSP system was used for determination of the pressure field on flat plate exposed to impinging jet. The presented procedures and results can be useful for research groups developing in-house PSP measurements systems for wind tunnel tests and internal flow investigations. | Pressure Sensitive Paint image registration impinging jet | 2018 | 4 | 253 | 68-80 | 10.2478/TAR-2018-0031 | Transactions on Aerospace Research |
| Łukasz Jeziorek, Krzysztof Szafran, Paweł Skalski | Heat Transfer Determined by the Temperature Sensitive Paint Method | Experimental methods | The paper presents practical aspects of determining the amount of heat flow by measuring the distribution of surface temperature using the Temperature Sensitive Paint (TSP) method. The quantity measured directly with TSP is the intensity of the excited radiation, which is then converted to surface temperature. The article briefly presents three different methods for determining the heat transfer coefficient. Each of these methods is based on a separate set of assumptions and significantly influences the construction of the measuring station. The advantages of each of the presented methods are their individual properties, allowing to improve accuracy, reduce the cost of testing or the possibility of using them in tests of highly complex objects. For each method a mathematical model used to calculate the heat transfer coefficient is presented. For the steady state heat transfer test method that uses a heater of constant and known thermal power, examples of the results of our own research are presented, together with a comparison of the results with available data and a discussion of the accuracy of the results obtained. | temperature sensitive paint TSP temperature measurement heat transfer coefficient HTC | 2018 | 4 | 253 | 45-57 | 10.2478/TAR-2018-0029 | Transactions on Aerospace Research |
| William J. Deitrick, Wit Stryczniewicz | Development and Testing of Data Reduction Software for Measurements Using Pressure Sensitive Paints | Experimental methods | The paper concentrates on post-processing of data necessary for pressure measurements using Pressure Sensitive Paints (PSP). The purpose of the study was to develop and test procedures for extraction of the surface pressure distribution from the images captured during PSP tests. The core issues addressed were reduction of the influence of model movement and deformation during wind tunnel run and synchronization between conventional pressure tap measurements and PSP data, necessary for in-situ calibration. In the course of the studies, two approaches on image registration were proposed: the first based on geometric transformation of control points pairs with cross-correlation tuning and the second based on similarity finding and estimation of geometric transformation of the images. Performance of the developed algorithm was tested with use of experimental set-up allowing for controlled movement of the imagined target with micrometer resolution. Both of the proposed approaches to PSP image resection proved to perform well. After testing of the software, the PSP system was used for determination of the pressure field on flat plate exposed to impinging jet. The presented procedures and results can be useful for research groups developing in-house PSP measurements systems for wind tunnel tests and internal flow investigations. | Pressure Sensitive Paint image registration impinging jet | 2018 | 4 | 253 | 68-80 | 10.2478/TAR-2018-0031 | Transactions on Aerospace Research |
| Grzegorz Kunikowski | Electricity Storage in Energy Clusters | Propulsion | The article aims to present the results of analysis and evaluation of using energy clusters as a bulk electricity storage. There were developed an analytical model of a sample microgrid (on-grid) and analysed using a software dedicated for optimizing such microgrids. The model of microgrid consist on electricity commercial and residential loads, photovoltaic and wind installations and batteries. | energy clusters electricity storage microgrid | 2018 | 4 | 253 | 25-37 | 10.2478/TAR-2018-0027 | Transactions on Aerospace Research |
| Alfons Mayer, Wolter Wieling | Green Propulsion Research at TNO the Netherlands | Propulsion | This paper describes the recent theoretical and experimental research by the Netherlands Organisation for Applied Scientific Research (TNO) into green replacements for hydrazine, hydrazine derivatives and nitrogen tetroxide, as propellants for in-space propulsion. The goal of the study was to identify propellants that are capable of outperforming the current propellants for space propulsion and are significantly less hazardous for humans and the environment. Two types of propellants were investigated, being monopropellants and bipropellants. The first section of the paper discusses the propellant selection. Nitromethane was found to be the most promising monopropellant. As bipropellant, a combination of hydrogen peroxide (HP) and ethanol was selected, where the ethanol is rendered hypergolic with hydrogen peroxide. The second part of the paper describes the experimental verification of these propellants by means of engine testing. Initiation of the decomposition of nitromethane was found to be problematic, hypergolic ignition of the hydrogen peroxide and ethanol bipropellant however was successfully demonstrated. | Green propulsion monopropellant bipropellant hydrogen peroxide nitromethane | 2018 | 4 | 253 | 1-24 | 10.2478/TAR-2018-0026 | Transactions on Aerospace Research |
| Lyubomyr Sabadosh, Serhii Larkov, Oleg Kravchenko, Vladyslav Sereda | Increasingly Safe, High-Energy Propulsion System for Nano-Satellites | Propulsion | Numerous attempts have been undertaken to develop propulsion systems for nano-satellite-type spacecrafts to enable their maneuvering in orbits. One of the potentially viable chemical propellant propulsion systems is a hybrid system. The present paper studies propellant composition variants with the metal hydride as fuel that can be chosen for a nano-satellite hybrid propulsion system. It defines key requirements for chemical propellant nano-satellite propulsion systems, and specifies potential propellant pairs based on a compact metal hydride. The study describes basic technical characteristics of a 1U CubeSat propulsion system. | satellite propulsion metal hydride hydrogen peroxide | 2018 | 4 | 253 | 38-44 | 10.2478/TAR-2018-0028 | Transactions on Aerospace Research |
| Mateusz Sochacki, Janusz Narkiewicz | Propulsion System Modelling for Multi-Satellite Missions Performed by Nanosatellites | Propulsion | Progress in miniaturization of satellite components allows complex missions to be performed by small spacecraft. Growing interest in the small satellite sector has led to development of standards such as CubeSat, contributing to lower costs of satellite development and increasing their service competitiveness. Small satellites are seen now as a prospective replacement for conventional sized satellites in the future, providing also services for demanding users. New paradigms of multi-satellite missions such as fractionation and federalization also open up new prospects for applications of small platforms. | propulsion nanosatellite formation flying constellations fractionated satellite federated satellite systems | 2018 | 4 | 253 | 58-67 | 10.2478/TAR-2018-0030 | Transactions on Aerospace Research |
| Alfons Mayer, Wolter Wieling | Green Propulsion Research at TNO the Netherlands | Space technology | This paper describes the recent theoretical and experimental research by the Netherlands Organisation for Applied Scientific Research (TNO) into green replacements for hydrazine, hydrazine derivatives and nitrogen tetroxide, as propellants for in-space propulsion. The goal of the study was to identify propellants that are capable of outperforming the current propellants for space propulsion and are significantly less hazardous for humans and the environment. Two types of propellants were investigated, being monopropellants and bipropellants. The first section of the paper discusses the propellant selection. Nitromethane was found to be the most promising monopropellant. As bipropellant, a combination of hydrogen peroxide (HP) and ethanol was selected, where the ethanol is rendered hypergolic with hydrogen peroxide. The second part of the paper describes the experimental verification of these propellants by means of engine testing. Initiation of the decomposition of nitromethane was found to be problematic, hypergolic ignition of the hydrogen peroxide and ethanol bipropellant however was successfully demonstrated. | Green propulsion monopropellant bipropellant hydrogen peroxide nitromethane | 2018 | 4 | 253 | 1-24 | 10.2478/TAR-2018-0026 | Transactions on Aerospace Research |
| Lyubomyr Sabadosh, Serhii Larkov, Oleg Kravchenko, Vladyslav Sereda | Increasingly Safe, High-Energy Propulsion System for Nano-Satellites | Space technology | Numerous attempts have been undertaken to develop propulsion systems for nano-satellite-type spacecrafts to enable their maneuvering in orbits. One of the potentially viable chemical propellant propulsion systems is a hybrid system. The present paper studies propellant composition variants with the metal hydride as fuel that can be chosen for a nano-satellite hybrid propulsion system. It defines key requirements for chemical propellant nano-satellite propulsion systems, and specifies potential propellant pairs based on a compact metal hydride. The study describes basic technical characteristics of a 1U CubeSat propulsion system. | satellite propulsion metal hydride hydrogen peroxide | 2018 | 4 | 253 | 38-44 | 10.2478/TAR-2018-0028 | Transactions on Aerospace Research |
| Mateusz Sochacki, Janusz Narkiewicz | Propulsion System Modelling for Multi-Satellite Missions Performed by Nanosatellites | Space technology | Progress in miniaturization of satellite components allows complex missions to be performed by small spacecraft. Growing interest in the small satellite sector has led to development of standards such as CubeSat, contributing to lower costs of satellite development and increasing their service competitiveness. Small satellites are seen now as a prospective replacement for conventional sized satellites in the future, providing also services for demanding users. New paradigms of multi-satellite missions such as fractionation and federalization also open up new prospects for applications of small platforms. | propulsion nanosatellite formation flying constellations fractionated satellite federated satellite systems | 2018 | 4 | 253 | 58-67 | 10.2478/TAR-2018-0030 | Transactions on Aerospace Research |
| Austin M. Karr, Wit Stryczniewicz | ESTIMATION OF AN AIRFOIL DRAG AT HIGH ANGLES OF ATTACK FROM PIV DATA | Aerodynamics | The paper presents application of Particle Image Velocimetry for determination of an airfoil’s drag coefficient in wind tunnel tests. The purpose of the study was to investigate the feasibility of using PIV as an alternative to pressure rake measurements, especially at high angles of attack. The integral momentum concept was applied for determination of fluid drag from experimental low speed wind tunnel data. The drag coefficient was calculated from velocity and pressure rake data for intermediate angles of attack from 5° to 10°. Additionally, the experimental results were compared to panel method results. After validating the procedures at low angles of attack, the drag coefficient was calculated at close to critical angles of attack. The presented study proved that PIV technique can be considered as an attractive alternative for drag coefficient determination of an airfoil. | fluid drag wind tunnel tests high angles of attack Particle Image Velocimetry | 2019 | 1 | 254 | 28-36 | 10.2478/TAR-2019-0003 | Transactions on Aerospace Research |
| Arkadiusz Rodak | COMPREHENSIVE AVIATON SYSTEM OF FLYING CREW IMPROVING SAFETY IN THE AIRCRAFT OPERATION | AIRCRAFT OPERATIONS | The article describes 10 known programmes of practical flight training in military aviation – specialization: Multi-Mission Tactical Jet Pilot, which is the highest level of military pilot training in all types of military and civil aviation – comparable only to the level of training and experience of the pilot-instructor of the Military Aviation School. The presented comparison was developed on the basis of literature research from the point of view of, among others, an aircraft operation engineer and a pilot-instructor. | TS-11 “Iskra” flight training military pilot flight safety | 2019 | 1 | 254 | 1-16 | 10.2478/TAR-2019-0001 | Transactions on Aerospace Research |
| Piotr Bajurko | MODELLING OF THE AEROSPACE STRUCTURE DEMONSTRATOR SUBCOMPONENT | Composite structures | Carbon-epoxy composite materials, due to their high strength in relation to mass, are increasingly used in the construction of aircraft structures, however, they are susceptible to a number of damages. One of the most common is delamination, which is a serious problem in the context of safe operation of such structures. As part of the TEBUK project, the Institute of Aviation has developed a methodology for forecasting the propagation of delamination. In order to validate the proposed method, an aerial structure demonstrator, modelled on the horizontal stabilizer of the I-23 Manager aircraft, was carried out. However, in order to carry out the validation, it was necessary to "simplify" the demonstrator model. The paper presents a numerical analysis conducted in order to separate from the TEBUK demonstrator model a fragment of the structure, which was used to study the delamination area, as an equivalent of the whole demonstrator. Subcomponent selection was carried out in several stages, narrowing down the analysed area covering delamination in subsequent steps and verifying the compliance of specific parameters with the same parameters obtained in a full demonstrator model. The parameters compared were: energy release rate values on the delamination front line and strain values in the delamination area. The numerical analyses presented in the paper were performed with the use of the MSC.Marc/Mentat calculation package. As a result of the analyses, a fragment of the structure was selected, which allows to significantly reduce the time and labour consumption of the production of the studied object, as well as to facilitate experimental research. | FEM delamination buckling carbon-epoxy composite | 2019 | 1 | 254 | 37-52 | 10.2478/TAR-2019-0004 | Transactions on Aerospace Research |
| Piotr Bajurko | MODELLING OF THE AEROSPACE STRUCTURE DEMONSTRATOR SUBCOMPONENT | Composites | Carbon-epoxy composite materials, due to their high strength in relation to mass, are increasingly used in the construction of aircraft structures, however, they are susceptible to a number of damages. One of the most common is delamination, which is a serious problem in the context of safe operation of such structures. As part of the TEBUK project, the Institute of Aviation has developed a methodology for forecasting the propagation of delamination. In order to validate the proposed method, an aerial structure demonstrator, modelled on the horizontal stabilizer of the I-23 Manager aircraft, was carried out. However, in order to carry out the validation, it was necessary to "simplify" the demonstrator model. The paper presents a numerical analysis conducted in order to separate from the TEBUK demonstrator model a fragment of the structure, which was used to study the delamination area, as an equivalent of the whole demonstrator. Subcomponent selection was carried out in several stages, narrowing down the analysed area covering delamination in subsequent steps and verifying the compliance of specific parameters with the same parameters obtained in a full demonstrator model. The parameters compared were: energy release rate values on the delamination front line and strain values in the delamination area. The numerical analyses presented in the paper were performed with the use of the MSC.Marc/Mentat calculation package. As a result of the analyses, a fragment of the structure was selected, which allows to significantly reduce the time and labour consumption of the production of the studied object, as well as to facilitate experimental research. | FEM delamination buckling carbon-epoxy composite | 2019 | 1 | 254 | 37-52 | 10.2478/TAR-2019-0004 | Transactions on Aerospace Research |
| Jan Kotlarz, Natalia Zalewska | THE POSSIBILITY OF ULTRAVIOLET ENCELADUS’ OBSERVATIONS FROM STRATOSPHERIC BALLOONS | EARTH | Stratospheric balloons are very important sources for space and terrestrial observation experiments in many disciplines. Instruments developed for astrophysical measurements are usually reusable. It is also possible to observe both hemispheres including observations from the polar and equatorial regions for thirty days or even longer. On the other hand the UV atmospheric transmittance window was used for the astrophysical observations less often than visible optical bands. At the end of the 2017 there are a few scientific groups working on near-UV or UV spectrographs and cameras for balloon flights. | stratospheric balloons Enceladus ultraviolet water ice tholin | 2019 | 1 | 254 | 17-27 | 10.2478/TAR-2019-0002 | Transactions on Aerospace Research |
| Andrzej Felner, Robert Konieczka | ROTORCRAFT IN THE PERFORMANCE BASED NAVIGATION INTERNATIONAL CIVIL AVIATION ORGANIZATION IMPLEMENTATION | ROTORCRAFT TECHNOLOGY | European Commision adopted in July new regulations about laying down airspace usage requirements and operating procedures concerning performance based navigation. It is next step in realization of the the global program PBN ICAO. At the 36th General Assembly of ICAO held in 2007, the Republic of Poland agreed to ICAO resolution A36-23 which urges all States to implement PBN. In future aviation concepts the use of Performance Based Navigation (PBN) is considered to be a major Air Traffic Management (ATM) concept element. ICAO has drafted standards and implementation guidance for PBN in the ICAO Doc 9613 “PBN Manual”. The Based Performance Navigation Concept represents and shift from sensor-based to performance based navigation connected with criteria for navigation: accuracy, integrity, availability, continuity and functionality depending on the phase of the flight. Through PBN and changes in the communication, surveillance and ATM domain, many advanced navigation applications are possible to improve airspace efficiency, improve airport sustainability, reduce the environmental impact of air transport in terms of noise and emission, increase safety and improve flight efficiency. | PBN ATM integrity accuracy continuity availability | 2019 | 1 | 254 | 53-64 | 10.2478/TAR-2019-0005 | Transactions on Aerospace Research |
| Jan Kotlarz, Natalia Zalewska | THE POSSIBILITY OF ULTRAVIOLET ENCELADUS’ OBSERVATIONS FROM STRATOSPHERIC BALLOONS | SPACE OBSERVATION | Stratospheric balloons are very important sources for space and terrestrial observation experiments in many disciplines. Instruments developed for astrophysical measurements are usually reusable. It is also possible to observe both hemispheres including observations from the polar and equatorial regions for thirty days or even longer. On the other hand the UV atmospheric transmittance window was used for the astrophysical observations less often than visible optical bands. At the end of the 2017 there are a few scientific groups working on near-UV or UV spectrographs and cameras for balloon flights. | stratospheric balloons Enceladus ultraviolet water ice tholin | 2019 | 1 | 254 | 17-27 | 10.2478/TAR-2019-0002 | Transactions on Aerospace Research |
| Maciej Karny | ON THE AREOSPACE-GRADE ADHESIVES SHEAR STRENGTH TESTING WITH ASTM D5656 TEST AS AN EXAMPLE | Adhesive bonding | This article presents adhesive shearing test methods, focusing especially on the ASTM D5656 method. These methods will be briefly characterized and compared. The most important concerns about the D5656 method are described. With the use of ASTM D1002 and D5656 methods, the influence of adherend surface preparation on shearing properties of the bond is evaluated. Compared to sandblasting only, sandblasting followed by the FPL process (sulfochromate etching of aluminum) increased shear strength of joints by 35 % for ASTM D1002 tests and by 48% for D5656 tests. Comparing these two methods, shear strength obtained in D5656 tests is about two times higher than in D1002 tests. The cause for this phenomena is much larger adherend thickness in the D5656 method, which provides the coupons with increased stiffness. Shear modulus, calculated with 3 different calculation methods, showed differences in obtained results, which points to necessary actualization of D5656 standard. | adhesives shear modulus ASTM D5656 shear strength | 2019 | 2 | 255 | 33-43 | 10.2478/TAR-2019-0008 | Transactions on Aerospace Research |
| Ruben Di Batista, Maria Teresa Scelzo, Maria Rosaria Vetrano | NUMERICAL STUDY OF AN ISOTHERMAL SLUSH FLOW FOR AEROSPACE PROPULSION APPLICATIONS | Aerodynamics | Slushes are two-phase solid-liquid single-species cryogenic fluids that exhibit an increased density and a greater heat capacity with respect to the corresponding normal boiling point liquids. These promising features are of large interest for applications that exploit slush as a thermal fluid, like super magnets refrigeration, cryogenic cooling of bio-materials or air conditioning, and for aerospace systems that use slush fluids as fuel or oxidizer. Several programs in the frame of the research on Slush Hydrogen (SLH2) as a new-generation fuel for aerospace propulsion have been started in the past. This work was carried out in the framework of a VKI research activity promoted by the Predict ESA Technology Research Programme, to investigate experimentally and numerically the behavior of slush flows in a representative upper stage feeding line. In this paper, we present a simulation based on a granular two-fluid model on an isothermal solid liquid mixture (slurry) and a Nitrogen slush (SLN2) fluid flowing in a horizontal pipe. A finite-volumes discretization using the software library OpenFOAM was benchmarked against experimental and numerical literature data, to assess the accuracy of the code in predicting pressure drops along the pipe axis and solid particle distribution across the pipe diameter. Moreover, the effects of concentration and inlet velocity are investigated. We show that the numerical model fairly reproduces the literature data in terms of important aspects as the solid volume fraction distribution and the pressure drops, especially for high flow rates. | fluid dynamics space propulsion multiphase flows CFD cryogenics slush flows | 2019 | 2 | 255 | 82-95 | 10.2478/TAR-2019-0011 | Transactions on Aerospace Research |
| Maciej Karny | ON THE AREOSPACE-GRADE ADHESIVES SHEAR STRENGTH TESTING WITH ASTM D5656 TEST AS AN EXAMPLE | Aerospace structures | This article presents adhesive shearing test methods, focusing especially on the ASTM D5656 method. These methods will be briefly characterized and compared. The most important concerns about the D5656 method are described. With the use of ASTM D1002 and D5656 methods, the influence of adherend surface preparation on shearing properties of the bond is evaluated. Compared to sandblasting only, sandblasting followed by the FPL process (sulfochromate etching of aluminum) increased shear strength of joints by 35 % for ASTM D1002 tests and by 48% for D5656 tests. Comparing these two methods, shear strength obtained in D5656 tests is about two times higher than in D1002 tests. The cause for this phenomena is much larger adherend thickness in the D5656 method, which provides the coupons with increased stiffness. Shear modulus, calculated with 3 different calculation methods, showed differences in obtained results, which points to necessary actualization of D5656 standard. | adhesives shear modulus ASTM D5656 shear strength | 2019 | 2 | 255 | 33-43 | 10.2478/TAR-2019-0008 | Transactions on Aerospace Research |
| Arnold Jędral | REVIEW OF TESTING METHODS DEDICATED FOR SANDWICH STRUCTURES WITH HONEYCOMB CORE | COMPOSITE MATERIALS | This paper is a review of testing methods dedicated for sandwich type composite structures with honeycomb core. First, information about the composition of sandwich materials structures, their properties, types of core materials and applications in the industry is presented. Mechanical properties were compared in the case of different types of the core material. Later, tests methods needed to describe properties of those materials and normalization organizations which create them were mentioned. The testing methods were divided into two groups: mechanical and physicochemical tests. Mechanical properties are: compressive strength (two types of test), edge compressive strength, shear strength (in two directions) and tension strength (two types of test). Physicochemical properties are: material density, water migration, water absorption and thermal conductivity. Testing methods were described according to American Society for Testing and Materials (ASTM) standards. This article is based on professional literature and the author’s experience. | mechanical properties sandwich panel materials honeycomb Kevlar Nomex | 2019 | 2 | 255 | 7-20 | 10.2478/TAR-2019-0006 | Transactions on Aerospace Research |
| Arnold Jędral | REVIEW OF TESTING METHODS DEDICATED FOR SANDWICH STRUCTURES WITH HONEYCOMB CORE | COMPOSITE STRUCTURES | This paper is a review of testing methods dedicated for sandwich type composite structures with honeycomb core. First, information about the composition of sandwich materials structures, their properties, types of core materials and applications in the industry is presented. Mechanical properties were compared in the case of different types of the core material. Later, tests methods needed to describe properties of those materials and normalization organizations which create them were mentioned. The testing methods were divided into two groups: mechanical and physicochemical tests. Mechanical properties are: compressive strength (two types of test), edge compressive strength, shear strength (in two directions) and tension strength (two types of test). Physicochemical properties are: material density, water migration, water absorption and thermal conductivity. Testing methods were described according to American Society for Testing and Materials (ASTM) standards. This article is based on professional literature and the author’s experience. | mechanical properties sandwich panel materials honeycomb Kevlar Nomex | 2019 | 2 | 255 | 7-20 | 10.2478/TAR-2019-0006 | Transactions on Aerospace Research |
| Arnold Jędral | REVIEW OF TESTING METHODS DEDICATED FOR SANDWICH STRUCTURES WITH HONEYCOMB CORE | COMPOSITES | This paper is a review of testing methods dedicated for sandwich type composite structures with honeycomb core. First, information about the composition of sandwich materials structures, their properties, types of core materials and applications in the industry is presented. Mechanical properties were compared in the case of different types of the core material. Later, tests methods needed to describe properties of those materials and normalization organizations which create them were mentioned. The testing methods were divided into two groups: mechanical and physicochemical tests. Mechanical properties are: compressive strength (two types of test), edge compressive strength, shear strength (in two directions) and tension strength (two types of test). Physicochemical properties are: material density, water migration, water absorption and thermal conductivity. Testing methods were described according to American Society for Testing and Materials (ASTM) standards. This article is based on professional literature and the author’s experience. | mechanical properties sandwich panel materials honeycomb Kevlar Nomex | 2019 | 2 | 255 | 7-20 | 10.2478/TAR-2019-0006 | Transactions on Aerospace Research |
| Hubert Skoneczny | PREPARATION AND IMPLEMENTATION OF A TEST FLIGHT OF LIGHTWEIGHT, UNMANNED STRATOSPHERIC BALLOON WITH GOPRO CAMERA MOUNTED AND ANALYSIS OF ACQUIRED MATERIAL | EARTH | Publication contains a description of the preparation and the implementation of a test flight of a stratospheric balloon with a mounted camera GoPro Hero3. Description includes: used equipment, its parameters, role in the success of the mission and the difficulties and limitations that the project team encountered during the preparation and implementation of the flight. The mission was attended by a team of six engineers and scientists from the Remote Sensing Division, who were also involved in the implementation of the HESOFF project. One of the main goals of the HESOFF project was to obtain aerial images on the Krotoszyńska Plate (woj. wielkopolskie) using the Unmanned Aerial Vehicle (UAV) and to carry out remote monitoring of oak stands. The primary goal of an experimental balloon flight was to check the technical operational capability and gain experience in planning and implementing this type of project. During the balloon raising, the video material was acquired in the form of a recording, which later was analyzed. On the basis of the collected information, the conclusions regarding the possibility of implementing a long endurance flight in the stratosphere, illustrating (using a multisensor platform) research surfaces of the HESOFF project were presented. The stages of implementation of the presented mission were divided into following parts: preparation of the flight with the completion of equipment and necessary documents (flight permission), proper flight realization, understood as the release of the balloon and identification of the place where the equipment landed, as well as analysis and presentation of the results. | stratospheric balloon photogrammetric flight GPS Unmanned Aerial Vehicle | 2019 | 2 | 255 | 21-32 | 10.2478/TAR-2019-0007 | Transactions on Aerospace Research |
| Maciej Karny | ON THE AREOSPACE-GRADE ADHESIVES SHEAR STRENGTH TESTING WITH ASTM D5656 TEST AS AN EXAMPLE | Manufacturing | This article presents adhesive shearing test methods, focusing especially on the ASTM D5656 method. These methods will be briefly characterized and compared. The most important concerns about the D5656 method are described. With the use of ASTM D1002 and D5656 methods, the influence of adherend surface preparation on shearing properties of the bond is evaluated. Compared to sandblasting only, sandblasting followed by the FPL process (sulfochromate etching of aluminum) increased shear strength of joints by 35 % for ASTM D1002 tests and by 48% for D5656 tests. Comparing these two methods, shear strength obtained in D5656 tests is about two times higher than in D1002 tests. The cause for this phenomena is much larger adherend thickness in the D5656 method, which provides the coupons with increased stiffness. Shear modulus, calculated with 3 different calculation methods, showed differences in obtained results, which points to necessary actualization of D5656 standard. | adhesives shear modulus ASTM D5656 shear strength | 2019 | 2 | 255 | 33-43 | 10.2478/TAR-2019-0008 | Transactions on Aerospace Research |
| Ruben Di Batista, Maria Teresa Scelzo, Maria Rosaria Vetrano | NUMERICAL STUDY OF AN ISOTHERMAL SLUSH FLOW FOR AEROSPACE PROPULSION APPLICATIONS | PROPULSION | Slushes are two-phase solid-liquid single-species cryogenic fluids that exhibit an increased density and a greater heat capacity with respect to the corresponding normal boiling point liquids. These promising features are of large interest for applications that exploit slush as a thermal fluid, like super magnets refrigeration, cryogenic cooling of bio-materials or air conditioning, and for aerospace systems that use slush fluids as fuel or oxidizer. Several programs in the frame of the research on Slush Hydrogen (SLH2) as a new-generation fuel for aerospace propulsion have been started in the past. This work was carried out in the framework of a VKI research activity promoted by the Predict ESA Technology Research Programme, to investigate experimentally and numerically the behavior of slush flows in a representative upper stage feeding line. In this paper, we present a simulation based on a granular two-fluid model on an isothermal solid liquid mixture (slurry) and a Nitrogen slush (SLN2) fluid flowing in a horizontal pipe. A finite-volumes discretization using the software library OpenFOAM was benchmarked against experimental and numerical literature data, to assess the accuracy of the code in predicting pressure drops along the pipe axis and solid particle distribution across the pipe diameter. Moreover, the effects of concentration and inlet velocity are investigated. We show that the numerical model fairly reproduces the literature data in terms of important aspects as the solid volume fraction distribution and the pressure drops, especially for high flow rates. | fluid dynamics space propulsion multiphase flows CFD cryogenics slush flows | 2019 | 2 | 255 | 82-95 | 10.2478/TAR-2019-0011 | Transactions on Aerospace Research |
| Goncharenko Andriy Viktorovich | HYBRID-OPTIONAL EFFECTIVENESS FUNCTIONS ENTROPY CONDITIONAL EXTREMIZATION DOCTRINE CONTRIBUTIONS INTO ENGINEERING SYSTEMS RELIABILITY ASSESSMENTS | RELIABILITY | In this publication a Doctrine for the Conditional Extremization of the Hybrid-Optional Effectiveness Functions Entropy is discussed as a tool for the Reliability Assessments of Engineering Systems. Traditionally, most of the problems having been dealt with in this area relate with the probabilistic problem settings. Regularly, the optimal solutions are obtained through the probability extremizations. It is shown a possibility of the optimal solutions “derivation”, with the help of a model implementing a variational principle which takes into account objectively existing parameters and components of the Markovian process. The presence of an extremum of the objective state probability is observed and determined on the basis of the proposed Doctrine with taking into account the measure of uncertainty of the hybrid-optional effectiveness functions in the view of their entropy. Such approach resembles the well known Jaynes’ Entropy Maximum Principle from theoretical statistical physics adopted in subjective analysis of active systems as the subjective entropy maximum principle postulating the subjective entropy conditional optimization. The developed herewith Doctrine implies objective characteristics of the process rather than subjective individual’s preferences or choices, as well as the states probabilities maximums are being found without solving a system of ordinary linear differential equations of the first order by Erlang corresponding to the graph of the process. Conducted numerical simulation for the proposed mathematical models is illustrated with the plotted diagrams. | effectiveness functions entropy hybrid-optional effectiveness multi-optionality optimal distribution variational principle probability reliability entropy maximum principle optimal periodicity | 2019 | 2 | 255 | 96-106 | 10.2478/TAR-2019-0012 | Transactions on Aerospace Research |
| Łukasz Czajkowski | MECHANICAL ANALYSIS PROCESS OF A COAXIAL COUNTER ROTOR FOR APPLICATIONS IN UNMANNED ULTRA-LIGHT UNITS | Rotorcraft technology | As the rotor configuration has the most impact on helicopter properties, the process of determination the assumptions for rotor design is a very important factor in the early stage of rotorcraft development. The following paper presents a mechanical analysis process used at the Institute of Aviation to quickly develop a coaxial rotor prototype applicable in ultra-light unmanned helicopter which has the potential for further improvement of its flight parameters. The article describes the rotor analysis process due to its feasibility based on commercially available solutions, the process of formulating assumptions for the entire structure, MES analysis of the rotor parts all leading to creation of the rotor prototype. | rotor analysis coaxial rotor ultra-light | 2019 | 2 | 255 | 44-64 | 10.2478/TAR-2019-0009 | Transactions on Aerospace Research |
| Jarosław Stanisławski | A SIMULATION MODEL FOR COMPUTING THE LOADS GENERATED AT LANDING SITE DURING HELICOPTER TAKE-OFF OR LANDING OPERATION | ROTORCRAFT TECHNOLOGY | The paper presents simulation method and results of calculations determining behavior of helicopter and landing site loads which are generated during phase of the helicopter take-off and landing. For helicopter with whirling rotor standing on ground or touching it, the loads of landing gear depend on the parameters of helicopter movement, occurrence of wind gusts and control of pitch angle of the rotor blades . The considered model of helicopter consists of the fuselage and main transmission treated as rigid bodies connected with elastic elements. The fuselage is supported by landing gear modeled by units of spring and damping elements. The rotor blades are modeled as elastic axes with sets of lumped masses of blade segments distributed along them. The Runge-Kutta method was used to solve the equations of motion of the helicopter model. According to the Galerkin method, it was assumed that the parameters of the elastic blade motion can be treated as a combination of its bending and torsion eigen modes. For calculations, data of a hypothetical light helicopter were applied. Simulation results were presented for the cases of landing helicopter touching ground with different vertical speed and for phase of take-off including influence of rotor speed changes, wind gust and control of blade pitch. The simulation method may help to define the limits of helicopter safe operation on the landing surfaces. | helicopter landing site landing gear loads | 2019 | 2 | 255 | 65-81 | 10.2478/TAR-2019-0010 | Transactions on Aerospace Research |
| Hubert Skoneczny | PREPARATION AND IMPLEMENTATION OF A TEST FLIGHT OF LIGHTWEIGHT, UNMANNED STRATOSPHERIC BALLOON WITH GOPRO CAMERA MOUNTED AND ANALYSIS OF ACQUIRED MATERIAL | SPACE OBSERVATION | Publication contains a description of the preparation and the implementation of a test flight of a stratospheric balloon with a mounted camera GoPro Hero3. Description includes: used equipment, its parameters, role in the success of the mission and the difficulties and limitations that the project team encountered during the preparation and implementation of the flight. The mission was attended by a team of six engineers and scientists from the Remote Sensing Division, who were also involved in the implementation of the HESOFF project. One of the main goals of the HESOFF project was to obtain aerial images on the Krotoszyńska Plate (woj. wielkopolskie) using the Unmanned Aerial Vehicle (UAV) and to carry out remote monitoring of oak stands. The primary goal of an experimental balloon flight was to check the technical operational capability and gain experience in planning and implementing this type of project. During the balloon raising, the video material was acquired in the form of a recording, which later was analyzed. On the basis of the collected information, the conclusions regarding the possibility of implementing a long endurance flight in the stratosphere, illustrating (using a multisensor platform) research surfaces of the HESOFF project were presented. The stages of implementation of the presented mission were divided into following parts: preparation of the flight with the completion of equipment and necessary documents (flight permission), proper flight realization, understood as the release of the balloon and identification of the place where the equipment landed, as well as analysis and presentation of the results. | stratospheric balloon photogrammetric flight GPS Unmanned Aerial Vehicle | 2019 | 2 | 255 | 21-32 | 10.2478/TAR-2019-0007 | Transactions on Aerospace Research |
| Robert S. Rowiński | MATHEMATICAL MODEL SAND COMPUTER SIMULATIONS OF AERIAL SPRAYINGAND DROPLETS DISTRIBUTION IN A TARGET SITE | Aerodynamics | Mathematical models describing aerial spraying and the distribution of liquid droplets on a target were presented. Relationships based on “free models” with Gaussian distribution of droplet concentrations and “bound models” that account for the impact of disturbances in the velocity field behind agricultural aircraft were expanded, and the hybrid model too. The results of experimental studies were presented and compared with theoretical calculations. The “bound model” was found to be the most effective solution for describing the physical phenomena that accompany the aerial spraying process. | agricultural aviation aerial spraying drift | 2019 | 3 | 256 | 24-42 | 10.2478/TAR-2019-0015 | Transactions on Aerospace Research |
| Robert S. Rowiński | MATHEMATICAL MODEL SAND COMPUTER SIMULATIONS OF AERIAL SPRAYINGAND DROPLETS DISTRIBUTION IN A TARGET SITE | Aircraft operations | Mathematical models describing aerial spraying and the distribution of liquid droplets on a target were presented. Relationships based on “free models” with Gaussian distribution of droplet concentrations and “bound models” that account for the impact of disturbances in the velocity field behind agricultural aircraft were expanded, and the hybrid model too. The results of experimental studies were presented and compared with theoretical calculations. The “bound model” was found to be the most effective solution for describing the physical phenomena that accompany the aerial spraying process. | agricultural aviation aerial spraying drift | 2019 | 3 | 256 | 24-42 | 10.2478/TAR-2019-0015 | Transactions on Aerospace Research |
| Mateusz Michalski, Wojciech Krauze | INFLUENCE OF HONEYCOMB CORE STABILIZATION ON COMPOSITE SANDWICH STRUCTURE GEOMETRY | COMPOSITE MATERIALS | Authors showed the influence of stabilization of the honeycomb core on shape of the composite sandwich test panel. Adhesive film laid on core ramps and cured with suitable cure cycle served as core stabilizer. Test panel geometry included different ramp angles (20° and 30°). To verify stabilization process a technology trial was performed. Three test panels were manufactured (3-stage, 1-stage and 1-stage with stabilized core). All test panels were manufactured in OoA process (Out of Autoclave). Panel surfaces were scanned with 3D scanner and compared with the reference CAD model. Both outer skin and inner skin were manufactured in Automated Fiber Placement Laboratory of Warsaw Institute of Aviation. | composite carbon fiber sandwich structure AFP thermoset material | 2019 | 3 | 256 | 1-13 | 10.2478/TAR-2019-0013 | Transactions on Aerospace Research |
| Maciej Karny | DETERMINATION OF IN-PLANE SHEAR PROPERTIESOF LAMINATE WITH V-NOTCH RAIL SHEAR TESTAND DIGITAL IMAGE CORRELATION | COMPOSITE MATERIALS | This article presents the results of the application of Digital Image Correlation (DIC) to measurements of in-plane shear modulus and strength of three different carbon fiber reinforced laminates. Three different approaches to shear strain calculations via DIC are evaluated and compared with standard strain gage measurements. Calculation of shear strain based on averaging DIC strain values of strain gages area in most cases yielded results closest to strain gages, while measurements based on single point strain measuring differed the most from strain gages. These results are attributed to shear strain distribution in the center area of the specimen. Thermoplastic matrix fabric reinforced composite had the lowest shear strength at 5% of shear strain, but the highest ultimate shear strength and strain at failure. Of thermosetting materials, laminate reinforced with unidirectional carbon fiber had shear modulus about 10% lower, than fabric reinforced laminate, but higher ultimate strength and strain at failure. This behavior is attributed to the presence of weaves in fabric reinforcing the laminate, causing shear stiffening of the material, but lowering its ability to deform under shear loading. | Digital Image Correlation in-plane shear thermoplastic laminates v-notch rail shear | 2019 | 3 | 256 | 57-65 | 10.2478/TAR-2019-0017 | Transactions on Aerospace Research |
| Mateusz Michalski, Wojciech Krauze | INFLUENCE OF HONEYCOMB CORE STABILIZATION ON COMPOSITE SANDWICH STRUCTURE GEOMETRY | COMPOSITE STRUCTURES | Authors showed the influence of stabilization of the honeycomb core on shape of the composite sandwich test panel. Adhesive film laid on core ramps and cured with suitable cure cycle served as core stabilizer. Test panel geometry included different ramp angles (20° and 30°). To verify stabilization process a technology trial was performed. Three test panels were manufactured (3-stage, 1-stage and 1-stage with stabilized core). All test panels were manufactured in OoA process (Out of Autoclave). Panel surfaces were scanned with 3D scanner and compared with the reference CAD model. Both outer skin and inner skin were manufactured in Automated Fiber Placement Laboratory of Warsaw Institute of Aviation. | composite carbon fiber sandwich structure AFP thermoset material | 2019 | 3 | 256 | 1-13 | 10.2478/TAR-2019-0013 | Transactions on Aerospace Research |
| Maciej Karny | DETERMINATION OF IN-PLANE SHEAR PROPERTIESOF LAMINATE WITH V-NOTCH RAIL SHEAR TESTAND DIGITAL IMAGE CORRELATION | COMPOSITE STRUCTURES | This article presents the results of the application of Digital Image Correlation (DIC) to measurements of in-plane shear modulus and strength of three different carbon fiber reinforced laminates. Three different approaches to shear strain calculations via DIC are evaluated and compared with standard strain gage measurements. Calculation of shear strain based on averaging DIC strain values of strain gages area in most cases yielded results closest to strain gages, while measurements based on single point strain measuring differed the most from strain gages. These results are attributed to shear strain distribution in the center area of the specimen. Thermoplastic matrix fabric reinforced composite had the lowest shear strength at 5% of shear strain, but the highest ultimate shear strength and strain at failure. Of thermosetting materials, laminate reinforced with unidirectional carbon fiber had shear modulus about 10% lower, than fabric reinforced laminate, but higher ultimate strength and strain at failure. This behavior is attributed to the presence of weaves in fabric reinforcing the laminate, causing shear stiffening of the material, but lowering its ability to deform under shear loading. | Digital Image Correlation in-plane shear thermoplastic laminates v-notch rail shear | 2019 | 3 | 256 | 57-65 | 10.2478/TAR-2019-0017 | Transactions on Aerospace Research |
| Mateusz Michalski, Wojciech Krauze | INFLUENCE OF HONEYCOMB CORE STABILIZATION ON COMPOSITE SANDWICH STRUCTURE GEOMETRY | COMPOSITES | Authors showed the influence of stabilization of the honeycomb core on shape of the composite sandwich test panel. Adhesive film laid on core ramps and cured with suitable cure cycle served as core stabilizer. Test panel geometry included different ramp angles (20° and 30°). To verify stabilization process a technology trial was performed. Three test panels were manufactured (3-stage, 1-stage and 1-stage with stabilized core). All test panels were manufactured in OoA process (Out of Autoclave). Panel surfaces were scanned with 3D scanner and compared with the reference CAD model. Both outer skin and inner skin were manufactured in Automated Fiber Placement Laboratory of Warsaw Institute of Aviation. | composite carbon fiber sandwich structure AFP thermoset material | 2019 | 3 | 256 | 1-13 | 10.2478/TAR-2019-0013 | Transactions on Aerospace Research |
| Maciej Karny | DETERMINATION OF IN-PLANE SHEAR PROPERTIESOF LAMINATE WITH V-NOTCH RAIL SHEAR TESTAND DIGITAL IMAGE CORRELATION | COMPOSITES | This article presents the results of the application of Digital Image Correlation (DIC) to measurements of in-plane shear modulus and strength of three different carbon fiber reinforced laminates. Three different approaches to shear strain calculations via DIC are evaluated and compared with standard strain gage measurements. Calculation of shear strain based on averaging DIC strain values of strain gages area in most cases yielded results closest to strain gages, while measurements based on single point strain measuring differed the most from strain gages. These results are attributed to shear strain distribution in the center area of the specimen. Thermoplastic matrix fabric reinforced composite had the lowest shear strength at 5% of shear strain, but the highest ultimate shear strength and strain at failure. Of thermosetting materials, laminate reinforced with unidirectional carbon fiber had shear modulus about 10% lower, than fabric reinforced laminate, but higher ultimate strength and strain at failure. This behavior is attributed to the presence of weaves in fabric reinforcing the laminate, causing shear stiffening of the material, but lowering its ability to deform under shear loading. | Digital Image Correlation in-plane shear thermoplastic laminates v-notch rail shear | 2019 | 3 | 256 | 57-65 | 10.2478/TAR-2019-0017 | Transactions on Aerospace Research |
| Wiesław Krzymień, Sławomir Cieślak | INITIAL ANALYSIS OF HELICOPTER IMPACTON HOSPITAL HELIPADS | ROTORCRAFT TECHNOLOGY | The need to quickly provide assistance to victims of accidents or seriously ill has created the need for the construction of helipads at selected hospitals. Their operation and the conditions of use are governed by regulation of the Ministry of Health on Hospital Emergency Ward (SOR) and rules required by the Civil Aviation Authority. | Helipads helicopter noise ground tests | 2019 | 3 | 256 | 14-23 | 10.2478/TAR-2019-0014 | Transactions on Aerospace Research |
| Andrzej Chyla, Michał Bukała | THE ANALYSIS OF HOSPITAL HELICOPTER LANDING SITESLOCATION IN TERMS OF THEIR VIBROACOUSTIC IMPACT | ROTORCRAFT TECHNOLOGY | According to the applicable regulations, in the case of a decision on the location of an investment consisting in the construction and commissioning of a helicopter landing field, it is necessary to carry out an environmental impact assessment. At the same time, due to the emission of noise related to the expected change of acoustic climate parameters, the indicators required under the applicable law related to building acoustics and also impact of vibration on the structure of buildings should be taken into account. The article discusses particular groups of issues related to the assessment of the impact of helicopter landing field on the environment and the hospital building. On the basis of the presented results of analyzes, a postulate concerning the necessity of introducing a comprehensive assessment methodology, including specific groups of issues, was formulated. | helicopter aircraft effective persist level building vibration | 2019 | 3 | 256 | 43-56 | 10.2478/TAR-2019-0016 | Transactions on Aerospace Research |
| Andrzej Kotarski | A CONCEPT OF SUBORBITAL SCIENTIFIC MISSIONAND TECHNOLOGY VALIDATION | Space technology | Suborbital platforms are one of alternatives for satellites. They offer cheaper access to space to perform broad range of scientific and technology R&D. One of suborbital platforms are sounding rockets, which are suitable for these applications. A concept of scientific mission utilizing the sounding rocket is presented by author in this paper. The novelty of this mission is the operational responsive launch approach, which presents the example of the mission which responds for payload user needs, not payload contest approach, which is often in scientific community competing for payload space in space agency sounding rocket launch campaigns. The main mission goal is to perform astronomical observation of NEO using IR/VIS telescope. The secondary goal is to qualify the instrument for use on astronomical satellite observatory and raise its technology readiness level from TRL 6 to TRL 8. The expected mission output is to gain scientific data on NEO object and perform new IR/VIS optoelectronic instrument technology validation. | Suborbital platforms sounding rockets space science optoelectronic instrument technology validation | 2019 | 3 | 256 | 66-74 | 10.2478/TAR-2019-0018 | Transactions on Aerospace Research |
| Natalia Majca-Nowak, Ewelina Kluska, Piotr Gruda | Comparative analysis of macro- and microstructure of printed elements in the FDM, SLS and MJ technologies | Additive manufacturing | The article presents research conducted with the project: ‘Additive manufacturing in conduction with optical methods used for optimization of 3D models’’ [2]. The article begins with the description of properties of the materials used in three different additive technologies – Fused Deposition Modelling (FDM), Selective Laser Sintering (SLS) and Material Jetting (MJ). The next part focuses on the comparative analysis of macro- and microstructure of specimens printed in order to test selected materials in additive technologies mentioned above. In this research two types of specimens were used: dumbbell specimens and rectangular prism with hole specimens. In order to observe macrostructure specimens, they were subjected to load test until it broke. In the case of observing microstructure, they were cut in some places. Each of described additive technologies characterizes by both different way of printing and used materials. These variables have a significant influence on macro- and microstructure and fracture appearance. FDM technology specimens printed of ABS material characterized by texture surface appearance. SLS technology specimens printed of PA12 material characterized by amorphous structure. MJ technology specimens printed of VeroWhite Plus material characterized by fracture appearance which had quasi- fatigue features. The microstructure of these specimens was uniform with visible inclusions. | additive manufacturing, 3D printing, macrostructure, microstructure, FDM, SLS, MJ, PolyJet | 2019 | 4 | 257 | 66-80 | 10.2478/TAR-2019-0024 | Transactions on Aerospace Research |
| Georges Bridel, Zdobyslaw Goraj, Lukasz Kiszkowiak, Jean-Georges Brévot, Jean-Pierre Devaux, Cezary Szczepanski | JANUS – A New approach to air combat pilot training | Aircraft design | Advanced jet training still relies on old concepts and solutions that are no longer efficient when considering the current and forthcoming changes in air combat. The cost of those old solutions to develop and maintain combat pilot skills are important, adding even more constraints to the training limitations. The requirement of having a trainer aircraft able to perform also light combat aircraft operational mission is adding unnecessary complexity and cost without any real operational advantages to air combat mission training. Thanks to emerging technologies, the JANUS project will study the feasibility of a brand-new concept of agile manoeuvrable training aircraft and an integrated training system, able to provide a live, virtual and constructive environment. The JANUS concept is based on a lightweight, low-cost, high energy aircraft associated to a ground based Integrated Training System providing simulated and emulated signals, simulated and real opponents, combined with real-time feedback on pilot’s physiological characteristics: traditionally embedded sensors are replaced with emulated signals, simulated opponents are proposed to the pilot, enabling out of sight engagement. JANUS is also providing new cost effective and more realistic solutions for “Red air aircraft” missions, organised in so-called “Aggressor Squadrons”. | air combat; advanced training; red air; training concept; innovation; | 2019 | 4 | 257 | 7-22 | 10.2478/TAR-2019-0019 | Transactions on Aerospace Research |
| Anna Bona | Theoretical and experimental review of applied mechanical tests for carbon composites with thermoplastic polymer matrix | COMPOSITE MATERIALS | This article has a theoretical and experimental character. It presents the characteristics of two main thermoplastics used in the aerospace industry – poly ether ether ketone (PEEK) and poly phenylene sulphide (PPS). The selected materials are compounds for the production of thermoplastic polymer matrix composites. The paper presents a literature review of the application of thermoplastic polymer matrix composite materials in aviation. Additionally, the paper focuses on the characteristics of carbon fibre-reinforced polymer (CFRP) which plays an important role in the production of aerospace components. Testing methods have been chosen on the basis of the type of composite matrix. The article contains the most important mechanical properties and general characteristics of thermoplastics used as a matrix for CFRP type composites used in the aerospace industry. Individual test procedures which allow for the evaluation of mechanical properties of composite materials on a thermoplastic polymer matrix, have been described. Mechanical tests such as static tensile test and bending of short beams were carried out in order to examine CFRP composites | carbon fibre composites, PEEK, PPS, CFRP, thermoplastics, investigations of PEEK and PPS composites. | 2019 | 4 | 257 | 55-79 | 10.2478/TAR-2019-0023 | Transactions on Aerospace Research |
| Robert Jaśkiewicz | Comparison of composite laminates machining methods and its influence on process temperature and edge quality | COMPOSITE MATERIALS | The article presents the description of technological trials and the results of three methods of machining carbon fiber reinforced composites panels. It also reviews the literature concerned heat affected zone in composites and its influence on material properties. As a part of the research, the cutting method using diamond coated saw was tested, as well as the milling method with two different types of carbide milling cutters. The processing of the panels was done using 4-axis CNC machine with special adapter for cutting discs in Composite Testing Laboratory (Center for Composite Technologies, Warsaw Institute of Aviation). The methods were compared in terms of machined edge quality and panel temperature during the processes. For this purpose, thermocouples were mounted into panels. Records from thermocouples were included. Edge quality and surface roughness have been checked by microscopic observation. Additionally, samples machined by each evaluated processing method were tested using differential scanning calorimetry (DSC). The method was used to determine the glass transition temperature of the tested material. The article conclusions contain a comparison of three processing methods in terms of cutting quality, process temperature, processing method productivity as well as DSC tests results. | CFRP machining, composite machining temperature, DSC tests, temperature tests. | 2019 | 4 | 257 | 46-54 | 10.2478/TAR-2019-0022 | Transactions on Aerospace Research |
| Jakub Wilk, Radosław Guzikowski | Validation of numerical models used for designing the composite blade for ILX-27 rotorcraft | COMPOSITE MATERIALS | The paper presents the validation procedure of the model used in the analysis of the composite blade for the rotor of the ILX-27 rotorcraft, designed and manufactured in the Institute of Aviation, by means of numerical analyses and tests of composite elements. Numerical analysis using finite element method and experimental studies of three research objects made of basic materials comprising the blade structure – carbon-epoxy laminate, glass-epoxy composite made of roving and foam filler – were carried out. The elements were in the form of four-point bent beams, and for comparison of the results the deflection arrow values in the middle of the beam and axial deformations on the upper and lower surfaces were selected. The procedure allowed to adjust the discrete model to real objects and to verify and correct the material data used in the strength analysis of the designed blade. | composites, FEM modelling, mechanical tests. | 2019 | 4 | 257 | 23-31 | 10.2478/TAR-2019-0020 | Transactions on Aerospace Research |
| Anna Bona | Theoretical and experimental review of applied mechanical tests for carbon composites with thermoplastic polymer matrix | COMPOSITE STRUCTURES | This article has a theoretical and experimental character. It presents the characteristics of two main thermoplastics used in the aerospace industry – poly ether ether ketone (PEEK) and poly phenylene sulphide (PPS). The selected materials are compounds for the production of thermoplastic polymer matrix composites. The paper presents a literature review of the application of thermoplastic polymer matrix composite materials in aviation. Additionally, the paper focuses on the characteristics of carbon fibre-reinforced polymer (CFRP) which plays an important role in the production of aerospace components. Testing methods have been chosen on the basis of the type of composite matrix. The article contains the most important mechanical properties and general characteristics of thermoplastics used as a matrix for CFRP type composites used in the aerospace industry. Individual test procedures which allow for the evaluation of mechanical properties of composite materials on a thermoplastic polymer matrix, have been described. Mechanical tests such as static tensile test and bending of short beams were carried out in order to examine CFRP composites | carbon fibre composites, PEEK, PPS, CFRP, thermoplastics, investigations of PEEK and PPS composites. | 2019 | 4 | 257 | 55-79 | 10.2478/TAR-2019-0023 | Transactions on Aerospace Research |
| Robert Jaśkiewicz | Comparison of composite laminates machining methods and its influence on process temperature and edge quality | COMPOSITE STRUCTURES | The article presents the description of technological trials and the results of three methods of machining carbon fiber reinforced composites panels. It also reviews the literature concerned heat affected zone in composites and its influence on material properties. As a part of the research, the cutting method using diamond coated saw was tested, as well as the milling method with two different types of carbide milling cutters. The processing of the panels was done using 4-axis CNC machine with special adapter for cutting discs in Composite Testing Laboratory (Center for Composite Technologies, Warsaw Institute of Aviation). The methods were compared in terms of machined edge quality and panel temperature during the processes. For this purpose, thermocouples were mounted into panels. Records from thermocouples were included. Edge quality and surface roughness have been checked by microscopic observation. Additionally, samples machined by each evaluated processing method were tested using differential scanning calorimetry (DSC). The method was used to determine the glass transition temperature of the tested material. The article conclusions contain a comparison of three processing methods in terms of cutting quality, process temperature, processing method productivity as well as DSC tests results. | CFRP machining, composite machining temperature, DSC tests, temperature tests. | 2019 | 4 | 257 | 46-54 | 10.2478/TAR-2019-0022 | Transactions on Aerospace Research |
| Jakub Wilk, Radosław Guzikowski | Validation of numerical models used for designing the composite blade for ILX-27 rotorcraft | COMPOSITE STRUCTURES | The paper presents the validation procedure of the model used in the analysis of the composite blade for the rotor of the ILX-27 rotorcraft, designed and manufactured in the Institute of Aviation, by means of numerical analyses and tests of composite elements. Numerical analysis using finite element method and experimental studies of three research objects made of basic materials comprising the blade structure – carbon-epoxy laminate, glass-epoxy composite made of roving and foam filler – were carried out. The elements were in the form of four-point bent beams, and for comparison of the results the deflection arrow values in the middle of the beam and axial deformations on the upper and lower surfaces were selected. The procedure allowed to adjust the discrete model to real objects and to verify and correct the material data used in the strength analysis of the designed blade. | composites, FEM modelling, mechanical tests. | 2019 | 4 | 257 | 23-31 | 10.2478/TAR-2019-0020 | Transactions on Aerospace Research |
| Anna Bona | Theoretical and experimental review of applied mechanical tests for carbon composites with thermoplastic polymer matrix | COMPOSITES | This article has a theoretical and experimental character. It presents the characteristics of two main thermoplastics used in the aerospace industry – poly ether ether ketone (PEEK) and poly phenylene sulphide (PPS). The selected materials are compounds for the production of thermoplastic polymer matrix composites. The paper presents a literature review of the application of thermoplastic polymer matrix composite materials in aviation. Additionally, the paper focuses on the characteristics of carbon fibre-reinforced polymer (CFRP) which plays an important role in the production of aerospace components. Testing methods have been chosen on the basis of the type of composite matrix. The article contains the most important mechanical properties and general characteristics of thermoplastics used as a matrix for CFRP type composites used in the aerospace industry. Individual test procedures which allow for the evaluation of mechanical properties of composite materials on a thermoplastic polymer matrix, have been described. Mechanical tests such as static tensile test and bending of short beams were carried out in order to examine CFRP composites | carbon fibre composites, PEEK, PPS, CFRP, thermoplastics, investigations of PEEK and PPS composites. | 2019 | 4 | 257 | 55-79 | 10.2478/TAR-2019-0023 | Transactions on Aerospace Research |
| Robert Jaśkiewicz | Comparison of composite laminates machining methods and its influence on process temperature and edge quality | COMPOSITES | The article presents the description of technological trials and the results of three methods of machining carbon fiber reinforced composites panels. It also reviews the literature concerned heat affected zone in composites and its influence on material properties. As a part of the research, the cutting method using diamond coated saw was tested, as well as the milling method with two different types of carbide milling cutters. The processing of the panels was done using 4-axis CNC machine with special adapter for cutting discs in Composite Testing Laboratory (Center for Composite Technologies, Warsaw Institute of Aviation). The methods were compared in terms of machined edge quality and panel temperature during the processes. For this purpose, thermocouples were mounted into panels. Records from thermocouples were included. Edge quality and surface roughness have been checked by microscopic observation. Additionally, samples machined by each evaluated processing method were tested using differential scanning calorimetry (DSC). The method was used to determine the glass transition temperature of the tested material. The article conclusions contain a comparison of three processing methods in terms of cutting quality, process temperature, processing method productivity as well as DSC tests results. | CFRP machining, composite machining temperature, DSC tests, temperature tests. | 2019 | 4 | 257 | 46-54 | 10.2478/TAR-2019-0022 | Transactions on Aerospace Research |
| Jakub Wilk, Radosław Guzikowski | Validation of numerical models used for designing the composite blade for ILX-27 rotorcraft | COMPOSITES | The paper presents the validation procedure of the model used in the analysis of the composite blade for the rotor of the ILX-27 rotorcraft, designed and manufactured in the Institute of Aviation, by means of numerical analyses and tests of composite elements. Numerical analysis using finite element method and experimental studies of three research objects made of basic materials comprising the blade structure – carbon-epoxy laminate, glass-epoxy composite made of roving and foam filler – were carried out. The elements were in the form of four-point bent beams, and for comparison of the results the deflection arrow values in the middle of the beam and axial deformations on the upper and lower surfaces were selected. The procedure allowed to adjust the discrete model to real objects and to verify and correct the material data used in the strength analysis of the designed blade. | composites, FEM modelling, mechanical tests. | 2019 | 4 | 257 | 23-31 | 10.2478/TAR-2019-0020 | Transactions on Aerospace Research |
| Kamila Stryczniewicz, Przemysław Drężek | CFD approach to modelling hydrodynamic characteristics of underwater glider | Hydrodynamics | Autonomous underwater gliders are buoyancy propelled vehicles. Their way of propulsion relies upon changing their buoyancy with internal pumping systems enabling them up and down motions, and their forward gliding motions are generated by hydrodynamic lift forces exerted on a pair of wings attached to a glider hull. In this study lift and drag characteristics of a glider were performed using Computational Fluid Dynamics (CFD) approach and results were compared with the literature. Flow behavior, lift and drag forces distribution at different angles of attack were studied for Reynolds numbers varying around 105 for NACA0012 wing configurations. The variable of the glider was the angle of attack, the velocity was constant. Flow velocity was 0.5 m/s and angle of the body varying from −8° to 8° in steps of 2°. Results from the CFD constituted the basis for the calculation the equations of motions of glider in the vertical plane. Therefore, vehicle motion simulation was achieved through numeric integration of the equations of motion. The equations of motions will be solved in the MatLab software. This work will contribute to dynamic modelling and three-dimensional motion simulation of a torpedo shaped underwater glider. | AUV, CFD, drag, glider, underwater glider. | 2019 | 4 | 257 | 32-45 | 10.2478/TAR-2019-0021 | Transactions on Aerospace Research |
| Robert Jaśkiewicz | Comparison of composite laminates machining methods and its influence on process temperature and edge quality | Manufacturing | The article presents the description of technological trials and the results of three methods of machining carbon fiber reinforced composites panels. It also reviews the literature concerned heat affected zone in composites and its influence on material properties. As a part of the research, the cutting method using diamond coated saw was tested, as well as the milling method with two different types of carbide milling cutters. The processing of the panels was done using 4-axis CNC machine with special adapter for cutting discs in Composite Testing Laboratory (Center for Composite Technologies, Warsaw Institute of Aviation). The methods were compared in terms of machined edge quality and panel temperature during the processes. For this purpose, thermocouples were mounted into panels. Records from thermocouples were included. Edge quality and surface roughness have been checked by microscopic observation. Additionally, samples machined by each evaluated processing method were tested using differential scanning calorimetry (DSC). The method was used to determine the glass transition temperature of the tested material. The article conclusions contain a comparison of three processing methods in terms of cutting quality, process temperature, processing method productivity as well as DSC tests results. | CFRP machining, composite machining temperature, DSC tests, temperature tests. | 2019 | 4 | 257 | 46-54 | 10.2478/TAR-2019-0022 | Transactions on Aerospace Research |
| Georges Bridel, Zdobyslaw Goraj, Lukasz Kiszkowiak, Jean-Georges Brévot, Jean-Pierre Devaux, Cezary Szczepanski | JANUS – A New approach to air combat pilot training | PILOTS TRAINING | Advanced jet training still relies on old concepts and solutions that are no longer efficient when considering the current and forthcoming changes in air combat. The cost of those old solutions to develop and maintain combat pilot skills are important, adding even more constraints to the training limitations. The requirement of having a trainer aircraft able to perform also light combat aircraft operational mission is adding unnecessary complexity and cost without any real operational advantages to air combat mission training. Thanks to emerging technologies, the JANUS project will study the feasibility of a brand-new concept of agile manoeuvrable training aircraft and an integrated training system, able to provide a live, virtual and constructive environment. The JANUS concept is based on a lightweight, low-cost, high energy aircraft associated to a ground based Integrated Training System providing simulated and emulated signals, simulated and real opponents, combined with real-time feedback on pilot’s physiological characteristics: traditionally embedded sensors are replaced with emulated signals, simulated opponents are proposed to the pilot, enabling out of sight engagement. JANUS is also providing new cost effective and more realistic solutions for “Red air aircraft” missions, organised in so-called “Aggressor Squadrons”. | air combat; advanced training; red air; training concept; innovation; | 2019 | 4 | 257 | 7-22 | 10.2478/TAR-2019-0019 | Transactions on Aerospace Research |
| Jakub Wilk, Radosław Guzikowski | Validation of numerical models used for designing the composite blade for ILX-27 rotorcraft | ROTORCRAFT TECHNOLOGY | The paper presents the validation procedure of the model used in the analysis of the composite blade for the rotor of the ILX-27 rotorcraft, designed and manufactured in the Institute of Aviation, by means of numerical analyses and tests of composite elements. Numerical analysis using finite element method and experimental studies of three research objects made of basic materials comprising the blade structure – carbon-epoxy laminate, glass-epoxy composite made of roving and foam filler – were carried out. The elements were in the form of four-point bent beams, and for comparison of the results the deflection arrow values in the middle of the beam and axial deformations on the upper and lower surfaces were selected. The procedure allowed to adjust the discrete model to real objects and to verify and correct the material data used in the strength analysis of the designed blade. | composites, FEM modelling, mechanical tests. | 2019 | 4 | 257 | 23-31 | 10.2478/TAR-2019-0020 | Transactions on Aerospace Research |
| Marcin Spiralski, Karol Bęben, Wojciech Konior, Dawid Cieśliński | High Altitude Ballooning as an Atmospheric Sounding System in the Pre-Flight Procedures of ILR-33 Amber | Atmospheric sounding | The paper presents research on the near real-time atmospheric sounding system. The main objective of the research was the development and testing of the weather sounding system based on a weather balloon. The system contains a redundant system of radiosondes, a lifting platform containing weather balloon and a holding system as well as ground station. Several tests of the system were performed in August and September 2019. Altitude, reliability, resistance to weather conditions and data convergence were tested. During tests, new procedures for such missions were developed. The final test was performed for the ILR-33 Amber Rocket as a part of pre-launch procedures. The test was successful and allowed to use acquired atmospheric data for further processing. Several post-tests conclusions were drawn. The altitude of sounding by a weather balloon depends mostly on weather conditions, the amount of gas pumped and the weight of a payload. The launching place and experience of the crew play an important role in the final success of the mission, as well. | weather balloon, unmanned free balloon, a tmosphere sounding, radiosonde, remote sensing, Earth observation | 2020 | 1 | 258 | 66-77 | 10.2478/TAR-2020-0005 | Transactions on Aerospace Research |
| Rafał Szymański | Non-Destructive Testing of Thermoplastic Carbon Composite Structures | COMPOSITE MATERIALS | The article is in line with the contemporary interests of companies from the aviation industry. It describes thermoplastic material and inspection techniques used in leading aviation companies. The subject matter of non-destructive testing currently used in aircraft inspections of composite structures is approximated and each of the methods used is briefly described. The characteristics of carbon pre-impregnates in thermoplastic matrix are also presented, as well as types of thermoplastic materials and examples of their application in surface ship construction. The advantages, disadvantages and limitations for these materials are listed. The focus was put on the explanation of the ultrasonic method, which is the most commonly used method during the inspection of composite structures at the production and exploitation stage. Describing the ultrasonic method, the focus was put on echo pulse technique and the use of modern Phased Array heads. Incompatibilities most frequently occurring and detected in composite materials with thermosetting and thermoplastic matrix were listed and described. A thermoplastic flat composite panel made of carbon pre-impregnate in a high-temperature matrix (over 300°C), which was the subject of the study, was described. The results of non-destructive testing (ultrasonic method) of thermoplastic panel were presented and conclusions were drawn. | thermoplastic, pre-impregnate, non-destructive testing, ultrasonic method, Phased Array. | 2020 | 1 | 258 | 34-52 | 10.2478/TAR-2020-0003 | Transactions on Aerospace Research |
| Rafał Szymański | Non-Destructive Testing of Thermoplastic Carbon Composite Structures | COMPOSITE STRUCTURES | The article is in line with the contemporary interests of companies from the aviation industry. It describes thermoplastic material and inspection techniques used in leading aviation companies. The subject matter of non-destructive testing currently used in aircraft inspections of composite structures is approximated and each of the methods used is briefly described. The characteristics of carbon pre-impregnates in thermoplastic matrix are also presented, as well as types of thermoplastic materials and examples of their application in surface ship construction. The advantages, disadvantages and limitations for these materials are listed. The focus was put on the explanation of the ultrasonic method, which is the most commonly used method during the inspection of composite structures at the production and exploitation stage. Describing the ultrasonic method, the focus was put on echo pulse technique and the use of modern Phased Array heads. Incompatibilities most frequently occurring and detected in composite materials with thermosetting and thermoplastic matrix were listed and described. A thermoplastic flat composite panel made of carbon pre-impregnate in a high-temperature matrix (over 300°C), which was the subject of the study, was described. The results of non-destructive testing (ultrasonic method) of thermoplastic panel were presented and conclusions were drawn. | thermoplastic, pre-impregnate, non-destructive testing, ultrasonic method, Phased Array. | 2020 | 1 | 258 | 34-52 | 10.2478/TAR-2020-0003 | Transactions on Aerospace Research |
| Rafał Szymański | Non-Destructive Testing of Thermoplastic Carbon Composite Structures | COMPOSITES | The article is in line with the contemporary interests of companies from the aviation industry. It describes thermoplastic material and inspection techniques used in leading aviation companies. The subject matter of non-destructive testing currently used in aircraft inspections of composite structures is approximated and each of the methods used is briefly described. The characteristics of carbon pre-impregnates in thermoplastic matrix are also presented, as well as types of thermoplastic materials and examples of their application in surface ship construction. The advantages, disadvantages and limitations for these materials are listed. The focus was put on the explanation of the ultrasonic method, which is the most commonly used method during the inspection of composite structures at the production and exploitation stage. Describing the ultrasonic method, the focus was put on echo pulse technique and the use of modern Phased Array heads. Incompatibilities most frequently occurring and detected in composite materials with thermosetting and thermoplastic matrix were listed and described. A thermoplastic flat composite panel made of carbon pre-impregnate in a high-temperature matrix (over 300°C), which was the subject of the study, was described. The results of non-destructive testing (ultrasonic method) of thermoplastic panel were presented and conclusions were drawn. | thermoplastic, pre-impregnate, non-destructive testing, ultrasonic method, Phased Array. | 2020 | 1 | 258 | 34-52 | 10.2478/TAR-2020-0003 | Transactions on Aerospace Research |
| Rafał Szymański | Non-Destructive Testing of Thermoplastic Carbon Composite Structures | Diagnostics | The article is in line with the contemporary interests of companies from the aviation industry. It describes thermoplastic material and inspection techniques used in leading aviation companies. The subject matter of non-destructive testing currently used in aircraft inspections of composite structures is approximated and each of the methods used is briefly described. The characteristics of carbon pre-impregnates in thermoplastic matrix are also presented, as well as types of thermoplastic materials and examples of their application in surface ship construction. The advantages, disadvantages and limitations for these materials are listed. The focus was put on the explanation of the ultrasonic method, which is the most commonly used method during the inspection of composite structures at the production and exploitation stage. Describing the ultrasonic method, the focus was put on echo pulse technique and the use of modern Phased Array heads. Incompatibilities most frequently occurring and detected in composite materials with thermosetting and thermoplastic matrix were listed and described. A thermoplastic flat composite panel made of carbon pre-impregnate in a high-temperature matrix (over 300°C), which was the subject of the study, was described. The results of non-destructive testing (ultrasonic method) of thermoplastic panel were presented and conclusions were drawn. | thermoplastic, pre-impregnate, non-destructive testing, ultrasonic method, Phased Array. | 2020 | 1 | 258 | 34-52 | 10.2478/TAR-2020-0003 | Transactions on Aerospace Research |
| Marcin Spiralski, Karol Bęben, Wojciech Konior, Dawid Cieśliński | High Altitude Ballooning as an Atmospheric Sounding System in the Pre-Flight Procedures of ILR-33 Amber | EARTH | The paper presents research on the near real-time atmospheric sounding system. The main objective of the research was the development and testing of the weather sounding system based on a weather balloon. The system contains a redundant system of radiosondes, a lifting platform containing weather balloon and a holding system as well as ground station. Several tests of the system were performed in August and September 2019. Altitude, reliability, resistance to weather conditions and data convergence were tested. During tests, new procedures for such missions were developed. The final test was performed for the ILR-33 Amber Rocket as a part of pre-launch procedures. The test was successful and allowed to use acquired atmospheric data for further processing. Several post-tests conclusions were drawn. The altitude of sounding by a weather balloon depends mostly on weather conditions, the amount of gas pumped and the weight of a payload. The launching place and experience of the crew play an important role in the final success of the mission, as well. | weather balloon, unmanned free balloon, a tmosphere sounding, radiosonde, remote sensing, Earth observation | 2020 | 1 | 258 | 66-77 | 10.2478/TAR-2020-0005 | Transactions on Aerospace Research |
| Goncharenko Andriy Viktorovich | Multi-Optional Hybrid Functions Entropy Doctrine Advantages for a State Maximal Probability Determination | RELIABILITY | The presented paper considers a comparison of the traditional methods for the state maximal probability determination to the proposed hybrid probabilistic and variational concept. It is shown the advantages of the described multi-optional hybrid-effectiveness functions uncertainty measure conditional optimization doctrine in the sense of avoiding the traditional ways analytical complicatedness concerning the maximal probability of the possible state determination. The results of the numerical example are presented. | entropy, dynamic state, risk, Markovian random process | 2020 | 1 | 258 | 53-65 | 10.2478/TAR-2020-0004 | Transactions on Aerospace Research |
| Jarosław Stanisławski | Performance of Quiet Helicopter | ROTORCRAFT TECHNOLOGY | Noise generated by helicopters is one of the main problems associated with the operation of rotorcrafts. Requirements for reduction of helicopter noise were reflected in the regulations introducing lower limits of acceptable rotorcraft noise. A significant source of noise generated by helicopters are the main rotor and tail rotor blades. Radical noise reduction can be obtained by slowing down the blade tips speed of main and tail rotors. Reducing the rotational speed of the blades may decrease rotor thrust and diminish helicopter performance. The problem can be solved by attaching more blades to main rotor. The paper presents results of calculation regarding improvement of the helicopter performance which can be achieved for reduced rotor speed but with increased number of rotor blades. The calculations were performed for data of hypothetical light helicopter. Results of simulation include rotor loads and blade deformations in chosen flight conditions. Equations of motion of flexible rotor blades were solved using the Galerkin method which takes into account selected eigen modes of the blades. The simulation analyzes can help to determine the performance and loads of a quiet helicopter with reduced rotor speed within the operational envelope of helicopter flight states. | helicopter, noise, rotor loads | 2020 | 1 | 258 | 1-17 | 10.2478/TAR-2020-0001 | Transactions on Aerospace Research |
| Marcin Spiralski, Karol Bęben, Wojciech Konior, Dawid Cieśliński | High Altitude Ballooning as an Atmospheric Sounding System in the Pre-Flight Procedures of ILR-33 Amber | SPACE OBSERVATION | The paper presents research on the near real-time atmospheric sounding system. The main objective of the research was the development and testing of the weather sounding system based on a weather balloon. The system contains a redundant system of radiosondes, a lifting platform containing weather balloon and a holding system as well as ground station. Several tests of the system were performed in August and September 2019. Altitude, reliability, resistance to weather conditions and data convergence were tested. During tests, new procedures for such missions were developed. The final test was performed for the ILR-33 Amber Rocket as a part of pre-launch procedures. The test was successful and allowed to use acquired atmospheric data for further processing. Several post-tests conclusions were drawn. The altitude of sounding by a weather balloon depends mostly on weather conditions, the amount of gas pumped and the weight of a payload. The launching place and experience of the crew play an important role in the final success of the mission, as well. | weather balloon, unmanned free balloon, a tmosphere sounding, radiosonde, remote sensing, Earth observation | 2020 | 1 | 258 | 66-77 | 10.2478/TAR-2020-0005 | Transactions on Aerospace Research |
| Zbigniew Gut | Using Electrical Capacitance Tomography System for Determination of Liquids in Rocket and Satellite Tanks | SPACE TECHNOLOGY | One of important problems in aerospace engineering is to determine the amount of fluid in the tank in a microgravity environment. There are several methods for doing it, however, there are no proven methods to quickly gauge the amount of propellant in a tank in low gravity conditions. New and more accurate methods of such a measurement are being continually searched for. One of interesting solutions is using Electrical Capacitance Tomography (ECT) for this purpose. The article presents both numerical analysis and experimental test results using a spherical tank. The main purpose of the simulation was to determine the effect of the number of electrodes and noise signal level on the quality of reconstruction images. In numerical simulations, different models of dielectric permittivity distribution have been reconstructed. On the basis of numerical simulations, a 24-electrode sensor was designed and made. In experimental tests, different distribution of medium inside the spherical tank was investigated. The results show that the method can directly measure the mass of fuel in the tank, as well as it allows for a visualization of fuel distribution, independent of the tank position in space, and the liquid-propellant system will be used. | tomography, satellite, tank. | 2020 | 1 | 258 | 18-33 | 10.2478/TAR-2020-0002 | Transactions on Aerospace Research |
| Adam Dziubiński | CFD Analysis of The Tractor Propulsion Concepts for an Inverted Joined Wing Airplane | Aerodynamics | Efficiency is a crucial parameter for an airplane to reduce both cost of operations and emission of pollutants. There are several airplane concepts that potentially allow for increasing the efficiency. A few of them were not investigated thoroughly enough yet. The inverted joined wing configuration, with the upper wing in front of the lower one is an example of such concept. Therefore, a project consisting of development of an experimental scaled demonstrator, and its wind tunnel and flight testing, was undertaken by consortium: Institute of Aviation, Warsaw University of Technology, Air Force Institute of Technology and a MSP company. Results led to a conclusion, that the inverted joined wing configuration allows to build an airplane with excellent performance, but its advantage against the conventional airplane is marginal because of large trimming drag of the configuration with relatively high position of the thrust vector in pusher configuration. It was applied because the demonstrator was a flying model of manned airplane and the tractor configuration would affect the pilot’s field of observation. However, in case of the UAV, this reason becomes insignificant. Therefore two configurations of tractor propulsion were tested to see, if their performance is better than the performance of original design. | CFD, joined wing, tractor propulsion. | 2020 | 2 | 259 | 13-26 | 10.2478/TAR-2020-0007 | Transactions on Aerospace Research |
| Pawel Zakrzewski, Janusz Narkiewicz, Darren Brenchley | Safety Critical Software Development Methodologies in Avionics | Avionics | This article summarizes avionics safety-critical software development methodologies and implications of the DO-178C standard from an Agile application perspective. We explain the safety-critical software categorization. It also outlines the main differences and advantages of different approaches to the development process, from Waterfall through the V-model to Iterative and Incremental. Agile principles are explained as well as a Scrum – which is a popular framework in the non-safety-critical software industry. The application of Agile, for safety-critical software considerations, is based on the practical knowledge of the authors, and looks at the potential solution from a DO-178C standard, size of the project, scalability, and organizational culture points of view. Definition of the Agile type of framework, consistent with the certification process and existing standards, has been highlighted as a potential game-changer for the avionics industry. | Avionics, Safety Critical Software, Agile, Systems Engineering | 2020 | 2 | 259 | 59-71 | 10.2478/TAR-2020-0011 | Transactions on Aerospace Research |
| Iuliia Lysenko, Volodymyr Eremenko, Yurii Kuts, Anatoliy Protasov, Valentin Uchanin | Advanced Signal Processing Methods for Inspection of Aircraft Structural Materials | Diagnostics | Aircraft, their assemblies, and units must provide high durability and reliability, and maintain mechanical and technological characteristics throughout the life span of the aircraft. Different elements of aircraft structures work under mechanical loads, over a wide temperature range, with varying degrees of exposure to corrosive environments. Aircraft structural materials have a variation in the characteristics values and require the various testing methods for their inspection. In many NDT methods applied in aviation materials testing, signals that could be represented by a narrowband processes model are used. Known methods of their processing are focused on determining and analyzing the signals amplitude characteristics, but the information resource contained in phase characteristics is not used. In the article, the methodology for signal processing and determining phase characteristics in the time domain are discussed. It is based on the combination of the discrete Hilbert transform and the deterministic and statistical methods of the phase measurement. There are given examples of the application of the methodology for pulsed eddy current testing of electrically conductive materials and products, ultrasonic thickness measurement of products made of materials have significant ultrasonic attenuation, the realization impulse variant of acoustic impedance flaw detection of products made of composite materials. The examples have shown that the proposed signal processing methodology enables to determine new information parameters and signal characteristics for the industry, and extend the scope of known NDT methods. | signal processing methodology, signal characteristics, information parameters, aviation materials testing | 2020 | 2 | 259 | 27-35 | 10.2478/TAR-2020-0008 | Transactions on Aerospace Research |
| Valentyn Uchanin | Detection of the Fatigue Cracks Initiated Near the Rivet Holes by Eddy Current Inspection Techniques | Diagnostics | Eddy current (EC) method is considered as most applicable for in-service detection of fatigue subsurface cracks initiated in aircraft multilayer structures near the rivet holes. At the same time, the successful solution of this problem is obstructed by additional noise created by defect-free rivets. All EC inspection techniques for the detection of subsurface cracks around the rivets can be classified into three main groups: 1) static mode – carried out by placing the EC probe concentrically on the rivet head; 2) rotational mode – when the EC probe is rotated around the rivet axle and 2) sliding mode – performed by the movement of EC probe along the rivet line or near it. All these approaches have some advantages and limitations. In this study, known EC techniques for the detection of cracks in multilayer aircraft structures are analyzed. New advanced EC techniques for the detection of fatigue cracks in internal layers of the riveted structures based on different types (ring, sliding, and rotational) probes are presented. The static EC method with developed low-height ring-type probe creates the possibility to detect cracks in the difficult of access areas. The possibility to estimate the length of detected cracks by a ring-type probe is shown. The proposed rotational remote field EC probe can detect as small as 1.0 mm long cracks under the button-head rivet and 2 mm thick upper skin with a high signal-to-noise ratio. Therefore, in many aircraft structures, fatigue cracks will be detected before a critical threshold achieved. New EC sliding techniques based on remote field and double differential probes were proposed for the rapid detection of cracks in internal layers of riveted aircraft structures. Remote-field EC probe for reliable detection of fatigue cracks in third and fourth layers of five-layer units was proposed. Another sliding technique based on a double differential EC probe gives the possibility to detect transverse cracks in the second layer without the rivet row area access. The main advantage of developed techniques is high inspection reliability due to the possibility to discriminate the signals created by cracks and defect-free rivets. Presented inspection procedures include the selective signal analysis in the complex plane diagram. Proposed EC inspection techniques were successfully implemented into the aircraft maintenance practice. | eddy current (EC), EC probe, rivet, multilayer aircraft structure, fatigue crack, operational frequency | 2020 | 2 | 259 | 47-58 | 10.2478/TAR-2020-0010 | Transactions on Aerospace Research |
| Goncharenko Andriy Viktorovich | The User-Preferred Optimal Flight Parameters in an Active Navigational System in a Multi-Alternative Situation | Navigation | The goal of this paper is to investigate the influence of the objectively existing effectiveness functions of an aircraft control system upon the control and managerial decision making process in the framework of the subjective entropy maximum princi-ple. The subjective analysis theory entropy paradigm makes it possible to consider the aircraft control system based upon personal preferences as an active system governed by an individual (active element of the control system) with the help of her/his individual subjective preferences optimal distributions obtained in conditions of operational multi-alternativeness and those operational alternatives the active system active element’s individual subjective preferences uncertainty. The described ap-proach takes into account the simple two-alternative operational situation in regards with the objectively existing effectiveness functions, related to the aircraft control system, in the view of a controlled parameter and a combination of it with its rate as the ratio. The obtained expressions for the objective functional extremal functions of the effectiveness and preferences, as well as the subjective entropy of the alternatives preferences, illustrated in diagrams visualize the situation and allow taking a good choice. The ideas of the required proper governing, managing, and control methods choice optimization with respect to only 2 alternative objective effectiveness functions arguments might be simple; nevertheless, increasing the number of parameters and further complication of the problem setting will not change the principle of the problem solution. | control, navigation, decision making, preferences, entropy theory. | 2020 | 2 | 259 | 1-12 | 10.2478/TAR-2020-0006 | Transactions on Aerospace Research |
| Dagmara Stasiowska | Can We be with Bee on Mars? Evaluating the Impact of a Rocket Flight on the Condition of Honeybees (Apis Mellifera) | SPACE TECHNOLOGY | In paper the issue of a rocket flight impact and overall survivability of such flight by Apis mellifera (western honeybees) specimens is raised. Author claims that it is the key for using them on Mars for pollination in future, as this species is considered as one of the best pollinators, and should be examined before sending first human missions to the Red Planet. Rocket payload ‘BeeO!Logical’ was designed in order to conduct the research, the first of its kind worldwide. Its assumptions are presented along with overall descriptions of the experiments in two sounding rockets. Analysed data included survivability, carbon dioxide concentration values (respiration levels), temperature and humidity. It has been shown that A. mellifera specimens are able to survive the rocket flight. Project development possibilities are described, including widening the scope of the research with bumblebees (Bombus) and implementation of biocybernetic model of bee colony. | honeybees, rocket, payload, Mars terraformation | 2020 | 2 | 259 | 36-46 | 10.2478/TAR-2020-0009 | Transactions on Aerospace Research |
| Goncharenko Andriy Viktorovich | Two entropy theory wings as a new trend for the modern means of air transport operational reliability measure. | Air transportation | The paper deals with the uncertainty of the operated system’s possible states hybrid combined optional functions. Traditionally, the probabilities of the system’s possible states are treated as the reliability measures. However, in the framework of the proposed doctrine, the optimality (for example, the maximal probability of the system’s state) is determined based upon a plausible assumption of the intrinsic objectively existing parameters. The two entropy theory wings consider on one hand the subjective preferences functions in subjective analysis, concerning the multi-alternativeness of the operational situation at an individual’s choice problems, and on the other hand the objectively existing characteristics used in theoretical physics. The discussed in the paper entropy paradigm proceeds with the objectively presented phenomena of the state’s probability and the probability’s maximum. The theoretical speculations and mathematical derivations are illustrated with the necessary plotted diagrams. | entropy, preference, option, optimization, probability, maximum, alternative, functional, condition | 2020 | 3 | 260 | 64-74 | 10.2478/TAR-2020-0017 | Transactions on Aerospace Research |
| Wojciech G. Miksa | Air taxi flight sharing. | AIR TRANSPORTATION | In traditional air taxi model, flight route and timing are assigned to every order individually, resulting in minimum utilization of seats, maximum number of empty legs and elevated price levels. Sharing flights, when possible, allow decreasing number of empty seats and distributing cost of flight among customers. Challenges to overcome are varying timing needs of customers and volatility of demand. This article investigates possibilities of synchronizing passenger orders. The proposed passenger pooling model replaces specific flight timing on order with constraints: latest arrival and earliest departure to provide room for coordination of orders, backed by web-based ICT. Theoretical test cases calculations verify the concept and compare it with traditional full on-demand and scheduled operations. | air taxi; service model; shared service; load factor | 2020 | 3 | 260 | 49-63 | 10.2478/TAR-2020-0016 | Transactions on Aerospace Research |
| Wojciech G. Miksa | Air taxi flight sharing. | Aircraft operations | In traditional air taxi model, flight route and timing are assigned to every order individually, resulting in minimum utilization of seats, maximum number of empty legs and elevated price levels. Sharing flights, when possible, allow decreasing number of empty seats and distributing cost of flight among customers. Challenges to overcome are varying timing needs of customers and volatility of demand. This article investigates possibilities of synchronizing passenger orders. The proposed passenger pooling model replaces specific flight timing on order with constraints: latest arrival and earliest departure to provide room for coordination of orders, backed by web-based ICT. Theoretical test cases calculations verify the concept and compare it with traditional full on-demand and scheduled operations. | air taxi; service model; shared service; load factor | 2020 | 3 | 260 | 49-63 | 10.2478/TAR-2020-0016 | Transactions on Aerospace Research |
| Mycola Chernyak, Vadym Kolesnyk | The accuracy of the navigational accelerometer with a nonlinear metrological model in operating conditions | Avionics | A mathematical model of the error of the navigational accelerometer caused by the nonlinearity of its metrological model, taking into account the influence of vibration, was developed. The method of experimental estimation of the vibration error based on the developed model was proposed. The main idea of the method is to evaluate parameters of the developed model during static tests in the terrestrial gravitational field and to calculate error according to the specific vibration characteristics – the amplitude in the case of harmonic vibration profile or the frequency band and the power spectral density in the case of random vibration. The effectiveness of the proposed method has been tested using three types of navigation accelerometers in comparison with the results of classical dynamic testing in various vibration conditions (harmonic, white noise, etc.). | navigational accelerometer, vibration error, metrological model, conversion function, identification of coefficients, static test. | 2020 | 3 | 260 | 1-10 | 10.2478/TAR-2020-0012 | Transactions on Aerospace Research |
| Yevhen Martseniuk | Steady and transient thermal state of turbine disc estimation for life time monitoring. | Diagnostics | In connection with increasing intensification of the working process in a gas turbine engine and increasing requirements for economy, the problem of defining and monitoring the main parts lifetime is becoming more vital. Modern algorithms of the monitoring systems are based on taking into account the levels of part temperature and total equivalent stress throughout the flight cycle. Thermal and stress-strain states of the critical zones of the main parts are determined on the basis of information received from the sensors installed in the engine gas path. Turbine disks are located in the internal cavities of the engine and are cooled by air from the compressor. However, in some designs, the disk cavity can be separated from the place of cooling air bleed by several stages of non-contact labyrinth seals, which will lead to some delay in changing the parameters of the cooling air flow when changing the engine operating mode. It has been observed that if this situation is not taken into account, it can lead to significant errors (more than 40%) in determining the lifetime for the peripheral zone of the disk. At the same time, this error is minimal for the hub and the middle zone of the disk, and the existing monitoring algorithms can be used. | lifetime, monitoring, thermal-stress state, model. | 2020 | 3 | 260 | 21-29 | 10.2478/TAR-2020-0014 | Transactions on Aerospace Research |
| Mycola Chernyak, Vadym Kolesnyk | The accuracy of the navigational accelerometer with a nonlinear metrological model in operating conditions. | Navigation | A mathematical model of the error of the navigational accelerometer caused by the nonlinearity of its metrological model, taking into account the influence of vibration, was developed. The method of experimental estimation of the vibration error based on the developed model was proposed. The main idea of the method is to evaluate parameters of the developed model during static tests in the terrestrial gravitational field and to calculate error according to the specific vibration characteristics – the amplitude in the case of harmonic vibration profile or the frequency band and the power spectral density in the case of random vibration. The effectiveness of the proposed method has been tested using three types of navigation accelerometers in comparison with the results of classical dynamic testing in various vibration conditions (harmonic, white noise, etc.). | navigational accelerometer, vibration error, metrological model, conversion function, identification of coefficients, static test. | 2020 | 3 | 260 | 1-10 | 10.2478/TAR-2020-0012 | Transactions on Aerospace Research |
| Tae-Hyeong Yi, Jing Lou, Cary Kenny Turangan, Piotr Wolanski | Numerical study of detonation processes in rotating detonation engine and its propulsive performance. | PROPULSION | Numerical studies on detonation wave propagation in rotating detonation engine and its propulsive performance with one- and multi-step chemistries of a hydrogen-based mixture are presented. The computational codes were developed based on the three-dimensional Euler equations coupled with source terms that incorporate high-temperature chemical reactions. The governing equations were discretized using Roe scheme-based finite volume method for spatial terms and second-order Runge-Kutta method for temporal terms. One-dimensional detonation simulations with one- and multi-step chemistries of a hydrogen-air mixture were performed to verify the computational codes and chemical mechanisms. In two-dimensional simulations, detonation waves rotating in a rectangular chamber were investigated to understand its flowfield characteristics, where the detailed flowfield structure observed in the experiments was successfully captured. Three-dimensional simulations of two-waved rotating detonation engine with an annular chamber were performed to evaluate its propulsive performance in the form of thrust and specific impulse. It was shown that rotating detonation engine produced constant thrust after the flowfield in the chamber was stabilized, which is a major difference from pulse detonation engine that generates repetitive and intermittent thrust. | detonation wave, rotating detonation engine, propulsion, chemical kinetics, finite volume method, adaptive mesh refinement. | 2020 | 3 | 260 | 30-48 | 10.2478/TAR-2020-0015 | Transactions on Aerospace Research |
| Yevhen Martseniuk | Steady and transient thermal state of turbine disc estimation for life time monitoring | Propulsion | In connection with increasing intensification of the working process in a gas turbine engine and increasing requirements for economy, the problem of defining and monitoring the main parts lifetime is becoming more vital. Modern algorithms of the monitoring systems are based on taking into account the levels of part temperature and total equivalent stress throughout the flight cycle. Thermal and stress-strain states of the critical zones of the main parts are determined on the basis of information received from the sensors installed in the engine gas path. Turbine disks are located in the internal cavities of the engine and are cooled by air from the compressor. However, in some designs, the disk cavity can be separated from the place of cooling air bleed by several stages of non-contact labyrinth seals, which will lead to some delay in changing the parameters of the cooling air flow when changing the engine operating mode. It has been observed that if this situation is not taken into account, it can lead to significant errors (more than 40%) in determining the lifetime for the peripheral zone of the disk. At the same time, this error is minimal for the hub and the middle zone of the disk, and the existing monitoring algorithms can be used. | lifetime, monitoring, thermal-stress state, model. | 2020 | 3 | 260 | 21-29 | 10.2478/TAR-2020-0014 | Transactions on Aerospace Research |
| Wiesław Krzymień, Michał Szmidt, Sławomir Cieślak | Vibration properties of steel constructed hospital elevated helipads. | ROTORCRAFT TECHNOLOGY | Polish Medical Air Rescue helicopters facilitate the rapid transport of patients to large hospitals. The requirements of the space around the helipad and the safety of flight operations mean that hospitals closer to city centers create more elevated helipads than ground-based helipads. The helipads can vary in the way they are constructed and located - depending on the possibilities offered by hospital buildings and their surroundings. Vibroacoustics Laboratory of the Institute of Aviation measured the vibration properties of some elevated helipads. The goal of this research was to determine the vibration properties of the helipads itself and the transmission of vibrations to the construction of the helipads, the building and its equipment caused by the landing and taking-off of a helicopter. This article presents some of the results of measurements of vibrations of steel constructed elevated helipads with the use of a modal hammer and while landing and taking-off of a helicopter, as well as comparison of the vibration properties concerning various elevated concrete helipads. | elevated helipads, ground vibration tests, vibration measurements | 2020 | 3 | 260 | 11-20 | 10.2478/TAR-2020-0013 | Transactions on Aerospace Research |
| Ohlenforst Barbara, Ligthart Seth, Aalmoes Roalt, Dirk Schreckenberg and Maykel van Miltenburg | Association between short-term annoyance and several physiological parameters during different amounts of nocturnal aircraft noise exposure. | Acoustics | Annoyance is the most prevalent community response to environmental noise. Observational and experimental lab studies have shown that exposure to environmental noise leads to annoyance, sleep disturbance, daytime sleepiness, increased heart rate and increased blood pressure. However, previous literature is preliminary based on controlled settings or experimental design, raising the question of the generalizability and applicability in daily life scenarios. This study aimed to investigate two main research questions. First, what is the relationship between short-term annoyance and different amounts of nocturnal aircraft noise exposure in daily life? Second, what is the relationship between physiological parameters, including heart rate, number of awakenings, sleep efficiency, sleep duration and different amounts of nocturnal aircraft noise exposure in daily life? This study also aimed to explore the suitability of non-invasive commercially available activity trackers to measure physiological metrics in a scientific way. During this field study, participants were wearing Fitbit Charge 3 activity trackers recording heart rate and different sleep-derived metrics (e.g. deep sleep duration, sleep efficiency and awakenings). The used activity trackers were readily available, non-intrusive, relatively cheap and easy to use by the participants. Simultaneously, a logbook was used by the participants to track the subjective perception and situational context of air traffic noise exposure. The noise levels corresponding to the exposure of air traffic of each participant were calculated based on the location of the participant and the corresponding radar track using an aircraft noise monitoring system. We hypothesize that a higher amount of exposure to aircraft noise in real life will be associated with increased annoyance, increased rest heartrate, higher number of awakenings, decreased sleep efficiency and decreased deep sleep duration. Preliminary results on the interactions between aircraft noise exposure, perceived annoyance and physiological metrics suggest increased nocturnal aircraft noise exposure seems to negatively affect sleep efficiency and deep sleep duration. | Aviation, aircraft noise, short-term annoyance, heart rate, deep sleep, sleep efficiency, awakenings, actigraphy. | 2020 | 4 | 261 | 1-12 | 10.2478/TAR-2020-0018 | Transactions on Aerospace Research |
| Ohlenforst Barbara, Ligthart Seth, Aalmoes Roalt, Dirk Schreckenberg and Maykel van Miltenburg | Association between short-term annoyance and several physiological parameters during different amounts of nocturnal aircraft noise exposure. | Aviation noise | Annoyance is the most prevalent community response to environmental noise. Observational and experimental lab studies have shown that exposure to environmental noise leads to annoyance, sleep disturbance, daytime sleepiness, increased heart rate and increased blood pressure. However, previous literature is preliminary based on controlled settings or experimental design, raising the question of the generalizability and applicability in daily life scenarios. This study aimed to investigate two main research questions. First, what is the relationship between short-term annoyance and different amounts of nocturnal aircraft noise exposure in daily life? Second, what is the relationship between physiological parameters, including heart rate, number of awakenings, sleep efficiency, sleep duration and different amounts of nocturnal aircraft noise exposure in daily life? This study also aimed to explore the suitability of non-invasive commercially available activity trackers to measure physiological metrics in a scientific way. During this field study, participants were wearing Fitbit Charge 3 activity trackers recording heart rate and different sleep-derived metrics (e.g. deep sleep duration, sleep efficiency and awakenings). The used activity trackers were readily available, non-intrusive, relatively cheap and easy to use by the participants. Simultaneously, a logbook was used by the participants to track the subjective perception and situational context of air traffic noise exposure. The noise levels corresponding to the exposure of air traffic of each participant were calculated based on the location of the participant and the corresponding radar track using an aircraft noise monitoring system. We hypothesize that a higher amount of exposure to aircraft noise in real life will be associated with increased annoyance, increased rest heartrate, higher number of awakenings, decreased sleep efficiency and decreased deep sleep duration. Preliminary results on the interactions between aircraft noise exposure, perceived annoyance and physiological metrics suggest increased nocturnal aircraft noise exposure seems to negatively affect sleep efficiency and deep sleep duration. | Aviation, aircraft noise, short-term annoyance, heart rate, deep sleep, sleep efficiency, awakenings, actigraphy. | 2020 | 4 | 261 | 1-12 | 10.2478/TAR-2020-0018 | Transactions on Aerospace Research |
| Michal Folusiak, Karol Swiderski, Piotr Wolanski | Numerical modeling of RDE. | PROPULSION | The idea of using the phenomenon of rotating detonation to propulsion has its roots in fifties of the last century in works of Adamson et al. and Nicholls et al. at the University of Michigan. The idea was recently reinvented and experimental research and numerical simulations on the Rotating Detonation Engine (RDE) are carried in numerous institutions worldwide, in Poland at Warsaw University of Technology (WUT) since 2004. Over the period 2010-2014 WUT and Institute of Aviation (IOA) jointly implemented the project under the Innovative Economy Operational Programme entitled ‘Turbine engine with detonation combustion chamber’. The goal of the project was to replace the combustion chamber of turboshaft engine GTD-350 with the annular detonation chamber. This paper is focused on investigation of the influence of a geometry and flow conditions on the structure and propagation stability of the rotating detonation wave. Presented results are in majority an outcome of the aforementioned programme, in particular authors’ works on the development of the in-house code REFLOPS USG and its application to simulation of the rotating detonation propagation in the RDE. | RDE, CFD, modeling, detonation, numerical | 2020 | 4 | 261 | 13-47 | 10.2478/TAR-2020-0019 | Transactions on Aerospace Research |
| Anatoly A. Vasil`ev | Rotating detonation: History, results, problems. | PROPULSION | Among of modern papers devoted to numerical modeling of rotated waves the greater part of papers are based on assumption that such wave propagates with velocity equals to the Chapman-Jouguet velocity of ideal detonation model with plane front. But the experimental velocities of rotated detonation waves, as a rule, are less (and even much less) the velocity of ideal Chapman-Jouguet detonation. Such regimes are named as low-velocity detonation or quasi-detonation and its characteristics are practically not investigated carefully. Moreover, similar to the spinning detonation, the strong connection of velocity of rotated transverse waves with the acoustic waves of reaction products was observed. So the new model with an allowance for the losses of impulse and energy must be used at numerical modeling of RDE and new experimental investigations of regimes with understated velocity must be carried out. In given paper some important aspects of rotated detonation waves and new experimental results are analyzed: the multifront system of rotated waves; correlation of rotation velocity of waves with acoustic characteristics of reaction products; streak-records trajectory of rotated waves on moving film; pressure and temperature profiles of rotating waves; velocity deficit and energy-release. | spinning detonation, rotated detonation wave, self-sustained supersonic regimes and their nature, low-velocity detonation, “quasi-detonation”, energy-release in reactive mixtures, instability of reaction zone, connection of DW instabilities with acoustic vibrations of reaction products, looses of impulse and energy. | 2020 | 4 | 261 | 48-60 | 10.2478/TAR-2020-0020 | Transactions on Aerospace Research |
| Sergiy Yepifanov | Aircraft turbine engine automatic control based on adaptive dynamic models. | PROPULSION | One of the most perspective development directions of the aircraft engine is the application of adaptive digital automatic control systems (ACS). The significant element of the adaptation is the correction of mathematical models of both engine and its executive, measuring devices. These models help to solve tasks of control and are a combination of static models and dynamic models, as static models describe relations between parameters at steady-state modes, and dynamic ones characterize deviations of the parameters from static values. The work considers problems of the models’ correction using parametric identification methods. It is shown that the main problem of the precise engine simulation is the correction of the static model. A robust procedure that is based on a wide application of a priori information about performances of the engine and its measuring system is proposed for this purpose. One of many variants of this procedure provides an application of the non-linear thermodynamic model of the working process and estimation of individual corrections to the engine components’ characteristics with further substitution of the thermodynamic model by approximating on-board static model. Physically grounded estimates are obtained based on a priori information setting about the estimated parameters and engine performances, using fuzzy sets. Executive devices (actuators) and the most inertial temperature sensors require correction to their dynamic models. Researches showed, in case that the data for identification are collected during regular operation of ACS, the estimates of dynamic model parameters can be strongly correlated that reasons inadmissible errors. The reason is inside the substantial limitations on transients’ intensity that contain regular algorithms of acceleration/deceleration control. Therefore, test actions on the engine are required. Their character and minimum composition are determined using the derived relations between errors in model coefficients, measurement process, and control action parameters. | turbine engine, automatic control, model, adaptation | 2020 | 4 | 261 | 61-70 | 10.2478/TAR-2020-0021 | Transactions on Aerospace Research |
| Qiaofeng Xie, Zifei Ji, Haocheng Wen, Zhaoxin Ren, Piotr Wolanski, Bing Wang | Review on the rotating detonation engine and its typical problems. | PROPULSION | Detonation is a promising combustion mode to improve engine performance, increase combustion efficiency, reduce emissions, and enhance thermal cycle efficiency. Over the last decade, significant progress has been made towards the applications of detonation mode in engines, such as standing detonation engine (SDE), Pulse detonation engine (PDE) and rotating detonation engine (RDE), and the understanding of the fundamental chemistry and physics processes in detonation engines via experimental and numerical studies. This article is to provide a comprehensive overview of the progress in the knowledge of rotating detonation engine from the different countries. New observations of injection, ignition, and geometry of combustor, pressure feedback, and combustion modes of RDE have been reported. These findings and advances have provided new opportunities in the development of rotating detonation for practical applications. Finally, we point out the current gaps in knowledge to indicate which areas future research should be directed at. | Detonation, propulsion system, rotating detonation. | 2020 | 4 | 261 | 107-163 | 10.2478/TAR-2020-0024 | Transactions on Aerospace Research |
| Jarosław Stanisławski | Effectiveness of the compound helicopter configuration in rotorcraft performance increase. | ROTORCRAFT TECHNOLOGY | The article presents the results of calculations applied to compare flight envelopes of varying helicopter configurations. Performance of conventional helicopter with the main and tail rotors, in the case of compound helicopter, can be improved by applying wings and pusher propellers which generate an additional lift and horizontal thrust. The simplified model of a helicopter structure, consisting of a stiff fuselage and the main rotor treated as a stiff disk, is applied for evaluation of the rotorcraft performance and the required range of control system deflections. The more detailed model of deformable main rotor blades, applying the Galerkin method, is used to calculate rotor loads and blade deformations in defined flight states. The calculations of simulated flight states are performed considering data of a hypothetical medium class helicopter with the take-off mass of 6,000kg. In the case of both of the helicopter configurations, the articulated main rotor hub is taken under consideration. According to the Galerkin method, the elastic blade model allows to compute blade deformations as a combination of the blade bending and torsional eigen modes. Introduction of additional wing and pusher propellers allows to increase the range of operational speed over 300 km/h. Results of the simulation are presented as time-runs of rotor loads and blade deformations and in a form of disk distribution plots of rotor parameters. The simulation method can be useful in defining requirements for a high speed rotorcraft. | compound helicopter, rotor loads, blade deformations | 2020 | 4 | 261 | 81-106 | 10.2478/TAR-2020-0023 | Transactions on Aerospace Research |
| Anastasiia Shcherban, Volodymyr Ieremenko | UAV flight safety system based on fuzzy logic. | UAV SAFETY | The article proposes a method of deciding on the continuation or termination of the UAV flight on the basis of fuzzy logic to ensure its trouble-free flight, which will be used in the future to build an onboard monitoring system of the power supply of the unmanned aerial vehicle. The developed method of decision-making allows to determine the residual battery life on the basis of data on current voltage, battery temperature, temperature on board the UAV and the direction and strength of the wind, using which the computer system will make recommendations for continuing or terminating the UAV flight task. The method of decision-making using fuzzy logic involves the formation of linguistic variables, which are the input information parameters and the output decision, their linguistic terms and membership functions, as well as a system of rules for decision-making. The voltage at the output of the battery, its surface temperature and the wind direction on board the UAV were used as input variables, and the residual battery life was used as the output linguistic variable | LPAB unmanned aircraft fuzzy logic system method of decision-making | 2020 | 4 | 261 | 71-80 | 10.2478/TAR-2020-0022 | Transactions on Aerospace Research |
| Valentyn Uchanin | Enhanced Eddy Current techniques for detection of surface-breaking cracks in aircraft structures. | Diagnostics | Well-timed detection of the defects (e.g., fatigue cracks and corrosive damages) in aircraft structures is the question of vital importance. Periodic in-service non-destructive inspection (NDI) is necessary to prevent expensive aircraft breakdowns during in-service life. Eddy current (EC) NDI method have many advantages for in-service aircraft inspection due to high mobility and the possibility to detect fatigue cracks without direct contact with the inspected surface (even through a protective coating without removal). Last decades some enhanced EC techniques were developed for aircraft in-service inspection in the Karpenko Physico-Mechanical Institute of National Academy of Sciences (Lviv) in collaboration with Ukrainian and foreign aircraft companies. Proposed earlier EC efficiency coefficient was applied for the selection of the ferrite-core EC probe parameters. Investigations concerned with the crack detectability for single-coil EC probes of different sizes were carried out to improve the inspection procedures. The sensitivity of the developed single-coil EC probe was experimentally investigated. The possibility to distinguish the signals associated with detected defect and lift-off was shown. The new inspection procedure was proposed for full suppression of the noise concerned with the rivet edge influence. The high-frequency EC flaw detector of Leotest VD 3.03 type based on self-generator mode and miniature single-coil EC probes application was developed for detection of the surface-breaking fatigue cracks. The original scheme of double-circuit self-generator with intermittent oscillations was invented and investigated. The pulse-repetition frequency of high-frequency oscillations was used as an informative parameter. The important feature of the developed self-generating scheme is the effective suppression of the lift-off influence (the changes of the clearance between the EC probe and the inspected object surface during the scanning). Developed EC flaw detectors of Leotest VD 3.03 type and inspection procedures were successfully implemented into the maintenance practice for detection of the fatigue cracks initiated in the wing and the fuselage structures and aviation engines in many companies such as ANTONOV AIRCRAFT, Lviv State Aircraft Repair Plant, Konotop aircraft repair plant «AVIAKON», Ukrainian International Airlines, MOTOR-SICH, State Enterprise “IVCHENKO-PROGRESS”, etc. | eddy current (EC) EC flaw detector single-coil EC probe complex plane aircraft structure fatigue crack self-generating scheme lift-off | 2021 | 1 | 262 | 1-14 | 10.2478/TAR-2021-0001 | Transactions on Aerospace Research |
| Jerzy Kozak, Tomasz Zakrzewski, Marta Witt, Martyna Dębowska-Wąsak | Selected problems of additive manufacturing using SLS/SLM processes. | Manufacturing | Additive Manufacturing (AM) based on Selective Laser Sintering (SLS) and Selective Laser Melting (SLM) is relatively widely used to manufacture complex shape parts made from metallic alloys, ceramic and polymers. Although the SLM process has many advantages over the conventional machining, main disadvantages are the relatively poor surface quality and the occurrence of the material structure defect porosity. The paper presents key problems directly related to the implementation of AM, and in particular the selection and optimization of process conditions. The first section examines the issues of dimensional accuracy, the second surface quality and porosity problem determining the mechanical properties of manufactured products. | additive manufacturing metal 3D printing SLS/SLM processes | 2021 | 1 | 262 | 24-44 | 10.2478/TAR-2021-0003 | Transactions on Aerospace Research |
| Przemysław Dobrzański, Witold Oleksiak | Design and analysis methods for composite bonded joints | Manufacturing | A literature review on existing design and analysis methods for composite adhesively bonded joints has been conducted. Methods that might form a basis for development of practical engineering methodology for adhesively bonded joints were selected and described. Starting from the simplest and the fastest analytical methods (closed-form solutions): average shear stress, shear lag model and adhesive beam model through more complex and more time consuming numerical methods supported by finite element analysis: global models, local models, cohesive zone models. Assumptions and applicability of each method was discussed. Simple and fast methods in order to be reliable have to include many conservative assumptions and therefore may lead to over-designed structure (weight penalty). Structural optimization and weight reduction require the usage of more complex and time consuming methods. Therefore, selection of adequate methods should always be balanced against strength, durability, costs and weight. | composites adhesives analytical models numerical models stress analysis | 2021 | 1 | 262 | 45-63 | 10.2478/TAR-2021-0004 | Transactions on Aerospace Research |
| Przemysław Dobrzański, Witold Oleksiak | Design and analysis methods for composite bonded joints | Materials | A literature review on existing design and analysis methods for composite adhesively bonded joints has been conducted. Methods that might form a basis for development of practical engineering methodology for adhesively bonded joints were selected and described. Starting from the simplest and the fastest analytical methods (closed-form solutions): average shear stress, shear lag model and adhesive beam model through more complex and more time consuming numerical methods supported by finite element analysis: global models, local models, cohesive zone models. Assumptions and applicability of each method was discussed. Simple and fast methods in order to be reliable have to include many conservative assumptions and therefore may lead to over-designed structure (weight penalty). Structural optimization and weight reduction require the usage of more complex and time consuming methods. Therefore, selection of adequate methods should always be balanced against strength, durability, costs and weight. | composites adhesives analytical models numerical models stress analysis | 2021 | 1 | 262 | 45-63 | 10.2478/TAR-2021-0004 | Transactions on Aerospace Research |
| Andrzej Felner, Robert Konieczka | Divagations on the appropriate satellite system from GNSS for aviation. | Navigation | American military satellite GPS system is an element of the global GNSS. It emits two codes: the precise and civil one. As late as in 2000, intentional interference that decreased precision of localization was introduced, allowing navigation accuracy of 20 m. GPS was made available to civil users, however, at their own responsibility. So, if we use GPS for our own goals, we must consider the errors that occur and their consequences. Nonetheless, commercial and operational needs determine the necessity of permanent access to satellite signal with appropriate consistency, accessibility, reliability and precision. Hence, natural and intentional errors are compensated for, using appropriate methods, based on a given activity. | GPS reliability precision consistency availability GNNS | 2021 | 1 | 262 | 75-92 | 10.2478/TAR-2021-0006 | Transactions on Aerospace Research |
| Izabela Korzec, Tomasz Łusiak, Martin Bugaj | Tests of selected mechanical properties of welded joints in rotorcraft. | Rotorcraft Diagnostics | The following article presents experimental use of different ways of inguinal connecting of aircraft elements using TIG (Tungsten Inert Gas), MAG (Metal Active Gas) and arched coated electrode. The object of the research were samples of rotorcraft elements, which were connected to each other by TIG, MAG methods and the coated electrode. The main aim of the research was to determine selected mechanical properties in particular hardness and strength of inguinal joints and then, based on the tests carried out, the best methods were selected. | Welding aerospace components TIG MAG coated electrode | 2021 | 1 | 262 | 64-74 | 10.2478/TAR-2021-0005 | Transactions on Aerospace Research |
| Małgorzata Wojtas, Łukasz Czajkowski, Kazimierz Szumański | Ground test stands for testing rotors in insulated conditions. | Rotorcraft technology | The paper generally discusses Whirl Tower research stands. Whirl Tower stands are used to test, among others, rotorcrafts main rotors in hovering. The work presents an overview of similar solutions of test stand presented in the available literature and online data. Beyond these solutions the paper also contains test stands used so far at the Institute of Aviation, these solutions were prepared for testing one type of rotor (for example: only for gyroplane rotors). The article provides information about new (Whirl Tower) test stand fully designed and manufactured in Łukasiewicz Research Network ‒ Institute of Aviation (Ł-ILOT). One of the basic assumptions is that it will be a universal test stand, giving the possibility to test different types of rotors. Moreover, the article discusses the types of tests and research that can be carried out on this type of test stand, tests that are performed to ensure the safety of the rotor design. | main rotor whirl tower tests | 2021 | 1 | 262 | 15-23 | 10.2478/TAR-2021-0002 | Transactions on Aerospace Research |
| Izabela Korzec, Tomasz Łusiak, Martin Bugaj | Tests of selected mechanical properties of welded joints in rotorcraft. | Rotorcraft technology | The following article presents experimental use of different ways of inguinal connecting of aircraft elements using TIG (Tungsten Inert Gas), MAG (Metal Active Gas) and arched coated electrode. The object of the research were samples of rotorcraft elements, which were connected to each other by TIG, MAG methods and the coated electrode. The main aim of the research was to determine selected mechanical properties in particular hardness and strength of inguinal joints and then, based on the tests carried out, the best methods were selected. | Welding aerospace components TIG MAG coated electrode | 2021 | 1 | 262 | 64-74 | 10.2478/TAR-2021-0005 | Transactions on Aerospace Research |
| Igor F. Kravchenko, Vasyl V. Loginov, Yevgene O. Ukrainets and Pavlo A. Hlushchenko | Aerodynamic characteristics of a straight wing with a spiroid wingtip device. | Aerodynamics | Spiroid wingtip devices (WD) offer a promising way of improving the lift drag ratio of UAVs, but may on the other hand lead to negative aerodynamic interference of the wing with the WD and deterioration of the aerodynamic characteristics as compared to a wing without the WD. Determining the influence of the geometric parameters of a spiroid WD on aerodynamic wing characteristics, however, remains an understudied field. In our study, we investigated the influence of the following geometrical parameters on wing aerodynamic characteristics with WD: area, radius, camber angle, constriction, and pitch of the spiroid. We found that the positive effect of the WD is present at a relative radius > 0.05, as well as with an increase in the lift coefficient CL as a result of an increase in the proportion of inductive resistance. For example, with the Reynolds number Re = 2.1×105 for a rectangular wing with an aspect ratio θ = 5.12 equipped with a spiroid WD with =0.15 the quality gain is almost 10% at CL = 0.5, and at CL = 0.7 is almost 20% and at CL = 0.7 – almost 20% compared to a wing without WD. Moreover, we found that a change in the camber angle WD θ provides an increase in the derivative of the lift coefficient with respect to the angle of attack in the range from θ = 0° to θ = 130°. By changing the camber angle, it is possible to increase the lift drag ratio of the layout up to 7.5% at θ = 90° compared to θ = 0° at the Reynolds number Re = 2.1×105. From the point of view of ensuring maximum lift drag ratio and minimum inductive drag, the angle θ = 90° is the most beneficial. | lift drag ratio flight range flight duration unmanned aerial vehicles aerodynamic configuration spiroid wingtip devices | 2021 | 2 | 263 | 46-62 | 10.2478/TAR-2021-0010 | Transactions on Aerospace Research |
| Vasyl Loginov, Oleksandr Grebnikov, Andrii Humennyi, Serhii Eremenko, Oleksandr Soboliev | Preliminary design for a jet training aircraft. | Aircraft design | This paper present the results of our project to develop the preliminary design of a jet trainer plane (JTP) with a two-person crew, the base version of which is intended for cadet training. We first consider the assumptions and requirements for the new aircraft, and review the parameters of existing aircraft designs in the similarly-purposed class. Next we argue for certain design choices, regarding the aircraft layout, cockpit configuration, wing location and wingform, tail scheme, and powerplant. The resulting aircraft design is calculated to have a maximum flight speed of 940 km/h, a ground-level rate of climb of 100 m/s, and a range of 1130 km. The plane’s take-off mass is calculated, in three approximations, at 2264 kg. Lastly we present the training plane’s geometrical parameters, general view, and master geometry. | jet trainer plane performance take-off mass scheme master geometry | 2021 | 2 | 263 | 30-45 | 10.2478/TAR-2021-0009 | Transactions on Aerospace Research |
| Głowacki Paweł, Kalina Piotr, Kawalec Michał | Estimating emissions of harmful exhaust components by aircraft engines during the takeoff and landing cycle in airport space. | Aircraft operations | This article examines, based on the available information and authors’ self-assessments, the environmental impact of turbine engine exhaust gases effect on the environment in the airport space during engines flight phases in the landing and takeoff cycle (LTO). The attention of aviation professionals is drawn to the fact that the amount of exhaust from the turbine engine is so significant that it may adversely change the ambient air at the airport. Consequently, increased emission level of carbon monoxide (CO), hydrocarbons (HC) during engine start-up and idle may pose a threat to the health of ramp staff. Also, high emission levels of nitrogen oxides (NOx) during takeoff, climb, cruise and descent is not without importance for the environment around the airport space. The paper gives CO2, HC, CO and NOx emission estimations based on ICAO Engine Emission Data Bank and the number of passenger operations at a medium-sized airport. It also provides calculation results of aircraft CO2, HC, CO and NOx emission using average times of aircraft maneuvers taken from aircraft Flight Data Recorder (FDR) in the LTO cycle various aircraft types at the airport. The latter, based on actual maneuvering times, lead to significantly reduced estimates of toxic exhaust gas emission volumes. | Ecology aircraft turbine engine engine exhaust toxic exhaust gas components nitrogen oxides carbon monoxide hydrocarbons carbon dioxide | 2021 | 2 | 263 | 63-70 | 10.2478/TAR-2021-0011 | Transactions on Aerospace Research |
| Aleksandrs Bitinš, Juris Maklakovs, Ruta Bogdane, Rafał Chatys, Vladimir Shestakov | Using adverse event pyramids to assess probabilities in airline safety management. | Aircraft operations | This article reviews the methods of safety management using Heinrich’s and Bird’s pyramids. The presence of a causal relationship between pyramid levels, as a result of inconsistencies in the activities of an organization and personnel, lead to incidents, and incidents in turn lead to accidents. The existence of such a relationship makes it possible to predict the risk of “top-level” events by reducing risks at the middle and lower levels. A mathematical description of the development process of an undesired aviation event is presented, which makes it possible to evaluate the probability of the successful (or unsuccessful) completion of a transportation task. Also given is an analysis of the development of an aviation accident, based on the example of the crash of a Lufthansa A-320 aircraft on 14 September 1993 at the airport of Warsaw (Poland) while landing in adverse weather conditions. | Airline safety management risk analysis | 2021 | 2 | 263 | 71-83 | 10.2478/TAR-2021-0012 | Transactions on Aerospace Research |
| Ken Wen, De-ning Di, Xiao-wei Chen | An alternative ballistic limit equation for the Whipple shield in the shatter regime, based on characteristics of the large central fragment. | Spacecraft design | In the shatter regime of a Whipple shield, a large central fragment makes a significant contribution to the damage-causing capacity of the debris cloud. Herein we present a feasible scheme for the identification and measurement of this large central fragment and propose an alternative approach to the ballistic limit equation (BLE) for the Whipple shield, deducing an alternative ballistic limit in the shatter regime based on the large central fragment’s characteristics. This alternative BLE is compared with the phenomenological Whipple BLE, the JSC Whipple BLE and the Ryan curve. Our alternative BLE, modified at the incipient fragmentation and completed fragmentation point, is shown to agree well with experimental results. | Whipple shield debris cloud ballistic limit equation large central fragment fragment identification | 2021 | 2 | 263 | 12-29 | 10.2478/TAR-2021-0008 | Transactions on Aerospace Research |
| Kubiak Katarzyna, Stypułkowska Justyna, Szymański Jakub, Spiralski Marcin | Estimation of bare soil moisture from remote sensing indices in the 0.4–2.5 μm spectral range. | UAV applications | Soil moisture content (SMC) is an important element of the environment, influencing water availability for plants and atmospheric parameters, and its monitoring is important for predicting floods or droughts and for weather and climate modeling. Optical methods for measuring soil moisture use spectral reflection analysis in the 350–2500 nm range. Remote sensing is considered to be an effective tool for monitoring soil parameters over large areas and to be more cost effective than in situ measurements. The aim of this study was to assess the SMC of bare soil on the basis of hyperspectral data from the ASD FieldSpec 4 Hi-Res field spectrometer by determining remote sensing indices and visualization based on multispectral data obtained from UAVs. Remote sensing measurements were validated on the basis of field humidity measurements with the HH2 Moisture Meter and ML3 ThetaProbe Soil Moisture Sensor. A strong correlation between terrestrial and remote sensing data was observed for 7 out of 11 selected indexes and the determination coefficient R2 values ranged from 67%– 87%. The best results were obtained for the NINSON index, with determination coefficient values of 87%, NSMI index (83.5%) and NINSOL (81.7%). We conclude that both hyperspectral and multispectral remote sensing data of bare soil moisture are valuable, providing good temporal and spatial resolution of soil moisture distribution in local areas, which is important for monitoring and forecasting local changes in climate. | soil moisture content remote sensing hyperspectral data bare soil UAV | 2021 | 2 | 263 | 1-11 | 10.2478/TAR-2021-0007 | Transactions on Aerospace Research |
| Iuliia Lysenko, Yurii Kuts, Anatoliy Protasov, Mykhailo Redka and Valentin Uchanin | Enhanced feature extraction algorithms using oscillatory-mode pulsed Eddy Current techniques for aircraft structure inspection. | A review of the existing literature shows that modern pulsed eddy current (PEC) technique for flaw detection in aircraft structure inspection is typically carried out in aperiodic mode. Аt the same time, the unstable characteristic points of the EC signal usually used as informative parameters can restrict the potential of this excitation mode due to significant measurement errors. This article considers an advanced PEC method of NDT based on the oscillatory mode. To obtain the conditions concerned with different modes of EC probe response oscillations, an equivalent scheme of the “testing object – EC probe” system was developed and analyzed. The frequency and attenuation coefficient of natural oscillations are proposed as the informative parameters of the probe signals. The obtained mathematical model of the probe signals allows for the dependence of proposed signal parameters on the characteristics of the testing object to be evaluated. Herein, we first develop algorithmic software for determining and analyzing the discrete amplitude and phase characteristics of PEC NDT signals based on the simulation results. The errors of the natural frequency oscillations and the attenuation coefficient determination as well as the optimal time for its determination are analyzed in order to minimize the possible errors. Next, the proposed informative parameters are experimentally investigated using a set of specimens. The obtained results confirm the possibility of the proposed methodology to enhance the inspection procedures related to the electrical conductivity and geometric parameters measurements as well as the detected defect sizing. | pulsed eddy current, natural oscillation frequency, attenuation, amplitude and phase signal characteristics | 2021 | 3 | 264 | 1-16 | 10.2478/TAR-2021-0013 | ||
| Ashish Vashishtha, Dean Callaghan, Cathal Nolan and Ralf Deiterding | Numerical investigation of detonation propagation through small orifice holes. | Seeking to better understand the physical phenomena underlying detonation wave propagation through small holes (especially the phenomenon of detonation re-initiation or its failure), we investigated the propagation of a detonation wave along a tube filled with a hydrogen-oxygen mixture diluted with argon, in the presence of obstacles with a small orifice hole. Numerical simulations were performed in a two-dimensional domain using adaptive mesh refinement and by solving compressible Euler equations for multiple thermally perfect species with a reactive source term. A premixed mixture of H2:O2:Ar at a ratio 2:1:7 at 10.0 kPa and 298 K was used in a 90 mm diameter tube with a detonation wave travelling from one end. We found that a single orifice placed at 200 mm from one end of the tube, with varying diameters of 6, 10, 14, 16, 18, 30, and 50 mm, showed an initial decoupling of the detonation wave into a shockwave and flame front. The detonation wave fails to propagate along the tube for orifice diameters less than λ, while it propagates by different re-initiation pathways for orifice diameters greater than λ, where λ is the cell-width for regular detonation propagation. | Detonation, propagation, hydrogen-oxygen mixture, numerical simulations, Adaptive Grid Refinement | 2021 | 3 | 264 | 17-33 | 10.2478/TAR-2021-0014 | ||
| Igor F. Kravchenko, Dmytro V. Kozel and Serhii A. Yevsieiev | Numerical simulation of the exit temperature pattern of an engine using a temperature-dependent turbulent Schmidt number. | This paper presents a numerical simulation for predicting the combustor exit temperature pattern of an aircraft engine, developed using the commercial fluid simulation software Ansys Fluent, which assumes a shape probability density function for the instantaneous chemistry in the conserved scalar combustion model and the standard k-ε model for turbulence. We found the compliance of the radial and circumferential non-uniformities of the exit temperature with the experimental data to be insufficient. To achieve much more accurate result, the mixing intensity was enhanced with respect to the initial calculation due to using the reduced value of the turbulent Schmidt number Sc. Numerical simulation was performed for values of the turbulent Schmidt number from Sc = 0.85 (default) up to Sc = 0.2, with results confirming the reduction of radial and circumferential non-uniformities of exit temperature. However, correlation between radial and circumferential non-uniformities is not admissible for these cases. Therefore, we propose to use a temperature-dependent formulation of the turbulent Schmidt number Sc, accounting for the increase in Sc number with increasing gas temperature. A user defined function (UDF) was used to implement the Sc number temperature dependence in Ansys Fluent. The numerical results for the proposed Schmidt number Sc temperature dependence were found to be in acceptable agreement with the experimental data both for radial and circumferential non-uniformities of the exit temperature pattern | Combustion chamber, exit temperature pattern, turbulent Schmidt number, temperature dependence, numerical simulation, UDF, ANSYS Fluent. | 2021 | 3 | 264 | 34-46 | 10.2478/TAR-2021-0015 | ||
| Sergiy Yepifanov and Andrii Brunak | Impact of load retention on aircraft engine parts under real flight cycle conditions in service life monitoring. | One of the major problems in the development of algorithms for monitoring the life of aircraft gas turbine engines is that the character of loading in real flight cycles is crucially different from the character of the static and dynamic loading during the testing of samples. This paper proposes a method for taking into account the effect of retentions at maximum stresses and cycle temperatures on the low-cycle fatigue (LCF) of the heat-resistant alloys used in engine parts. Regularities in repeated-static loading (RSL) are used in combination with the method of linear accumulation of damage due to the LCF and RSL, with retentions of a variable length. A non-linear equation is derived for the summation of these damages, the solution of which determines the durability (life) of the part while taking into account the retention duration. The theoretical results were verified by using the experimental characteristics of the GS-6K and EI-437B nickel-based alloys, previously reported by other researchers. | gas turbine engine, service life, repeated-static loading, low-cycle fatigue, creep, retention of load. | 2021 | 3 | 264 | 47-57 | 10.2478/TAR-2021-0016 | ||
| Rafał Kowalik, Tomasz Łusiak and Andrej Novak | A mathematical model for controlling a quadrotor UAV. | Given the recent surge in interest in UAVs and their potential applications, a great deal of work has lately been done in the field of UAV control. However, UAVs belong to a class of nonlinear systems that are inherently difficult to control. In this study we devised a mathematical model for a PID (proportional integral derivative) control system, designed to control a quadrotor UAV so that it follows a predefined trajectory. After first describing quadrotor flight dynamics, we present the control model adopted in our system (developed in MATLAB Simulink). We then present simulated results for the use of the control system to move a quadrotor UAV to desired locations and along desired trajectories. Positive results of these simulation support the conclusion that a quadrotor UAV spatial orientation control system based on this model will successfully fulfil its task also in real conditions. | UAV control system, dynamics model, quadrotor, linearization | 2021 | 3 | 264 | 58-70 | 10.2478/TAR-2021-0017 | ||
| Andriy Viktorovich Goncharenko | A two-point approximation approach to determining aircraft aerodynamic force coefficients for a maximal-duration horizontal flight. | This paper proposes a two-point approximation approach to determining aircraft aerodynamic force coefficients, and compares it to the traditional methods. A variational concept is used to conduct aircraft flight trials for the maximal duration of quasi-horizontal flights. The advantages of the described optimization theories are demonstrated, in terms of aviation fuel gas savings. The results of a numerical example are presented. | erodynamic force, aerodynamic coefficient, test, trial, aircraft, flight, maximal duration, maximal distance, horizontal flight. | 2021 | 3 | 264 | 71-80 | 10.2478/TAR-2021-0018 | ||
| Taras Yanko and Olexii Dmytrenko | Prospects for the Implementation of New Materials and Technologies in the Aerospace Industry. | This article considers the main materials used to make aircraft, both fuselage and engines. First, the problems that force developers to introduce new materials in aircraft production are identified. We then present features of the introduction of heat-resistant titanium alloys, ways of improving the mechanical properties of parts made of titanium alloys, and methods of manufacturing complex details. Other promising materials for the aviation industry, such as high-entropy alloys, quasicrystals, carbon-carbon materials, and nickel foam, are also considered. | engine, alloy, aerospace industry, powder, material, metal | 2021 | 4 | 265 | 1-10 | 10.2478/TAR-2021-0019 | ||
| Juris Maklakovs, Aleksandrs Bitins, Ruta Bogdane and Vladimir Shestakov | Using Heinrich’s (Bird’s) Pyramid of Adverse Events to Assess the Level of Safety in an Airline. | One of the key concepts in matters of flight safety is that of special (abnormal) situations, with airworthiness regulation and certification of aviation equipment being based on this concept. At the same time, one is forced to admit that today there is no explicit interpretation of the standardized traits of special situations, nor are they not fully elucidated in the scientific literature. In this article we propose a pyramid-based approach to interpreting special (abnormal) in-flight situations, which allows for risk assessment not using risk matrices, but instead relying only on the probabilistic characteristics of the occurrence of events. Using the presence of a causal relationship between the layers of the pyramid, we propose an algorithm for the transition of varying degrees of danger of special situations. This algorithm can be used to develop an on-board device that informs the pilot about the dynamics of transitions from one situation to another, representing each emergency situation in a certain color. | Aviation safety, risks, Heinrich’s (Bird) pyramid, special (abnormal) situations. | 2021 | 4 | 265 | 11-20 | 10.2478/TAR-2021-0020 | ||
| Oleksandr Grebenikov, Vasyl Loginov, Andrii Humennyi, Liliia Buival and Anton Chumak | The KhAI-90 Light Civil Turboprop Airplane Pilot Project. | The pilot project of new light civil turboprop aircraft, called the KhAI-90, featuring a cruising speed of 350km/h, payload of 600 kg at 500 km range, and equipped with two turboprop Rolls-Royce 250-B17F engines each with power of 420 hp (alternatively, two AI-450C engines each with power of 450 hp may be installed) is presented herein. Based on the developed technical task, the concept for creating the KhAI-90 new competitive light civil aircraft, and the analysis of prototypes’ aircraft parameters and characteristics, the main tactical and technical requirements are assigned. The take-off weight of the new aircraft is determined in three approximations at the preliminary design stage of light civil turboprop aircraft, using the iterative software “CLA-TOW”, studying the influence of the wing geometric parameters and lift devices on aerodynamic performance, the power-to-weight ratio and the airplane weight parameters. The following parameters are calculated for the design: minimum take-off weight WTO min = 3,600 kg, optimal wing loading p0 opt = 130 daN/m2, optimal aspect ratio 9.6, taper ratio 2.25, sweep angle at leading edge 3 degrees, airfoil relative thickness 10.6%. A general view and three-dimensional parametric models of the master-geometry and passenger cabin space distribution are constructed for the KhAI-90 by means of the SIEMENS NX computer integrated system. More broadly, this pilot project has also demonstrated the viability of the method we developed and previously reported for determining light civil turboprop airplane parameters. | pilot project, aircraft design, light civil airplane, method, take-off weight, Three-Dimensional Parametric Modelling | 2021 | 4 | 265 | 21-40 | 10.2478/TAR-2021-0022 | ||
| Nobuyuki Tsuboi, A. Koichi Hayashi, Yoshikazu Tamauchi and Takashi Kodama | Numerical Simulation of the Deflagration to Detonation Transition in a Tube with Repeated Obstacles: Experimental Scale Simulation Using the Artificial Thickened Flame Method. | The Artificial Thickened Flame (ATF) method, which involves artificially increasing the flame thickness so as to simulate with a coarse grid resolution, is applied to reduce the computational cost of predicting the Deflagration to Detonation Transition (DDT) in a tube with repeated obstacles. While simulation results depended on the parameter N (the number of grid points in laminar flame thickness), it was found that N values of more than 10 may be excessive. The results show that the chosen simulation method predicts the flame speed as compared to a reference experiment and captures the detail of the strong ignitions near the corner between the obstacle and the sidewall. The present simulation also captures the wrinkle flame front structure during the acceleration of flame. | Detonation, Deflagration-to-Detonation Transition(DDT), Artificial Thickening Flame(ATF), Obstacle | 2021 | 4 | 265 | 41-52 | 10.2478/TAR-2021-0021 | ||
| Vasyl Loginov, Yevgen Ukrainets, Viktor Popov and Yevgen Spirkin | Determining the Aerodynamic Characteristics of a Propeller-Driven Anti-UAV Fighter While Designing Air Propellers. | Given the rising imporatnce of unmanned aerial vehicles (UAVs), this article addresses the urgent scientific problem of determining the aerodynamic characteristics while laying out propellers for the wings of small unmanned aerial vehicles (UAVs). We discuss the methodology for experimental wind-tunnel studies of aircraft configurations with propellers. It is shown that a characteristic feature of the configuration small-elongation wing with propellers is the absence of elements that are not affected by propellers. This feature makes it difficult to implement and automate a wind tunnel experiment, since there are problems with providing similar criteria for a working propeller; it is difficult to achieve perfect balancing for solid drive propellers, which causes vibration, the level of which depends on uncontrolled factors; the inability to neglect the presence of the body elements influence to the blades of propellers; the difficulty of direct measuring propeller thrust and torque. The presented methodology involves the integrated usage of experimental and numerical methods to eliminate the difficulties in conducting physical experiments in a wind tunnel. This approach makes it possible to combine the high credibility of experimental data in the study of the physical essence of phenomena with high efficiency and accuracy in determining aerodynamic characteristics by numerical methods. Using this approach, we established dependences of the aerodynamic characteristics of the small-elongation wing configuration with counter-rotating propellers on the geometric and kinematic parameters of the configuration for other extensions and constrictions of the wings. These data can serve as the basis for the development of recommendations for the selection of sensible geometric parameters of the aerodynamic configuration of a small-elongation wing with counter-rotating propellers. | unmanned aerial vehicle, fighter, aerodynamic characteristics, aerodynamic configuration, propeller, propeller regulator. | 2021 | 4 | 265 | 53-67 | 10.2478/TAR-2021-0023 | ||
| Norbert Hegyi and János Jósvai | A Comparative Structural Analysis of Four Radiosonde Models. | In this study, we first performed a comprehensive structural analysis of four models of radiosondes (devices intended for use as the meteorological probe of a sounding balloon) manufactured by three different companies – Graw, Vaisala and Meteomodem. The radiosondes were disassembled for visual inspection and manual measurement, three-dimensional computed tomography images were taken of their inner structure, and the outer shapes of the radiosondes were scanned with a structured-light three-dimensional scanner. The structural properties of the radiosondes thus identified were then compared to one other, based on which the Meteomodem M10 was ranked as the least harmful in a potential collision. Next, the Meteomodem M10 radiosonde was used in collision tests with a heavy target and with a pumpkin model, in order to evaluate the possible damage caused by and to the radiosonde in different types of collisions. | radiosonde, unmanned free balloon, computed tomography measurement, collision test | 2021 | 4 | 265 | 68-81 | 10.2478/TAR-2021-0024 | ||
| Tomasz Kwiatkowski, Adam Sieradzki and Borys Łukasik | Method of Designing a Distortion Gauze for Testing a Boundary Layer Ingesting Fan. | As global trends aim to reduce emissions of pollutants, boundary layer ingesting (BLI) propulsions are attracting more and more attention. As such, N+2 generation aircraft with propulsion placed in the aft of the aircraft are gaining in popularity. The boundary layer is formed on the fuselage before entering the engine located in the aft of the aircraft. Due to significant difficulties in performing experimental tests of BLI propulsors with full-size aircraft, distortion gauzes are one of the methods to provide the desired air velocity profile at the inlet. This paper describes a novel method of designing such gauzes, a topic which is not well covered in the existing literature. In the first stage of the presented method, single orifices of different sizes were calculated using CFD tools. The relationship between their size and the gauze resistance coefficient was identified, making it possible to model the distortion gauze using porous media. An iterative approach was used to design a gauze that meets the requirements. This is, to our knowledge, the first distortion gauze design description where a porous media model has been used. Experimental tests demonstrated that the produced distortion gauze yields a velocity profile comparable to the desired one. This indicates the great potential of using the presented approach in further research on boundary layer ingesting propulsions. It offers an opportunity to reduce substantially both the costs of experimental research and the time required to design a distortion-tolerant fan. | boundary layer ingestion, distortion gauze, porous media, distorted velocity profile | 2022 | 1 | 266 | 1-17 | 10.2478/TAR-2022-0001 | ||
| Włodzimierz Balickii, Paweł Głowacki and Leszek Loroch | Threats to Aviation Safety Caused by Defects in Aircraft Airframe Systems. | Alongside the increase in air traffic and number of aircraft, the number of reported aviation events has also been increasing. We processed the data included in the European Coordination Centre for Aviation Incident Reporting Systems (ECCAIRS), analyzing small and large aircraft reliability and the safety of their operations, covering events according to ICAO aviation occurrence categories. Airframe systems are the largest contributor to the total number of reported events which occurred in Polish registered aircraft in the years 2008–2020. A detailed study of airframe systems reliability was carried out in order to assess the real reason for the failures. Airframe systems faults were assigned to specific ATA chapters and then to each of their sections. The results of this analysis may support the decisions of supervisory authorities in the areas where security threats are most important. They can also help aircraft operators with identification of the airframe units which require special attention. Identification of significant parts due to the frequency of malfunctions of particular system components may support designers. In short, these results are valuable in terms of further developments in statistical tools facilitating New Product Introduction (NPI). | aviation transport, flight safety, safety performance indicators, airframe system, aviation occurrence | 2022 | 1 | 266 | 18-34 | 10.2478/TAR-2022-0002 | ||
| Nezar Sahbon, Siddharth Murpani, Maciej Michałów, Dariusz Miedziński and Mateusz Sochacki | A CFD Study of the Aerodynamic Characteristics of Twardowsky and FOK Rockets. | Stability and performance are crucial characteristics for aerospace vehicles. The ability to investigate the aerodynamics and performance of rockets gives an insight into their stability before flight and the potential for design and performance enhancements. For the past 13 years, the Rocketry Division within the Students’ Space Association of Warsaw University of Technology has been developing sounding rockets of different designs and mission profiles. Two rockets have been chosen for the CFD (Computational Fluid Dynamics) campaigns, FOK and Twardowsky. This paper describes the mathematical model of aerodynamic loads used by the Division for sounding rocket simulation, followed by CFD campaigns for the two rockets. The results of the CFD analysis are then used to calculate the rockets’ aerodynamic derivatives according to a previously defined mathematical model. | computational fluid dynamics, sounding rockets, aerodynamics, modeling | 2022 | 1 | 266 | 35-58 | 10.2478/TAR-2022-0003 | ||
| Joanna Michałowska, Łukasz Puzio, Arkadiusz Tofil and Jarosław Pytka | Measuring Exposure to High-Frequency Electromagnetic Fields Experienced by a Helicopter Crew During Flight. | High-frequency electromagnetic fields (EMF) can have a negative effect on both the human body and electronic devices. Monitoring and measurement of the electromagnetic field generated by devices is important from the point of view of environmental protection, the human body and electromagnetic compatibility. In this study, we tested the value of the electromagnetic field strength determined by the NHT3DL by Microrad with measurement probes during flights in the Robinson R44 helicopter. The reference point for the results obtained were the normative limits of the electromagnetic field permitted to affect the crew and passengers during flight. The maximum RMS values recorded during the measurements were E = 4.399 V/m in the 100 kHz–6.5 GHz frequency band and for the magnetic component H = 2.829 A/m in the 300 kHz–30 MHz frequency band. These results were passed to the Statistica 13.3 software for a detailed stochastic analysis of the values tested. | electromagnetic, helicopter, exposure, high-frequency | 2022 | 1 | 266 | 59-65 | 10.2478/TAR-2022-0004 | ||
| Andriy Viktorovich Goncharenko | Solving a Certain Two-Alternative Problem in the Optimal Organization of Aviation Transportation in Conditions of Uncertainty. | This paper proposes a solution to a certain two-alternative problem of aviation transportation optimal organization in conditions of uncertainty of the subjective preference functions. Conditional optimization of the objective functional containing the entropy of the individuals’ operational effectiveness functions preferences is carried out in the framework of the simplest variational problem. The advantages of the described optimization approach are demonstrated in the generalized terms of the operational effectiveness functions for aviation transportation organization. | aviation transportation, operational effectiveness, objective functional optimization, simplest variational problem, entropy | 2022 | 1 | 266 | 66-74 | 10.2478/TAR-2022-0005 | ||
| Aleksandrs Bitiņš, Ruta Bogdane, Vladimir Shestakov and Anastasija Stepanova | Theoretical and Methodological Approaches to the Information Base for an Airline’s Flight Safety System. | This article presents a model and an algorithm for identifying, collecting, processing, analyzing and using data on risks at an airline (deviations from the standards in the activities of various airline units and personnel) to minimize them and thereby to achieve an acceptable level of flight safety. A methodology is also presented for formulating the composition of flight safety indicators, based on an expert approach, for the units and personnel of the airline, making decisions in this field in various areas of its activities. The model is based on the quality and flight safety systems that form part of an integrated management system at one of Latvia’s airlines. The system makes it possible to analyze safety aspects on the basis of actual information drawn from various sources into the airline's information base, where it is collected, classified, stored and analyzed. | airline, model information base, flight safety. | 2022 | 1 | 266 | 75-83 | 10.2478/TAR-2022-0006 | ||
| Allen L. Kuhl, Antoni Koichi Hayashi and Piotr Wolański | The contribution of A.K. Oppenheim to explaning the nature of the initiation of gaseous detonation in tubes. | This paper analyzes A.K. Oppenheim’s original works on the transition of deflagration into detonation and reviews them from the perspective of new numerical and experimental results recently obtained on such phenomena. Particular attention is focused on processes happening in the boundary layer of the tube walls ahead of the accelerating flame. The results of the theoretical analyses of temperature variations inside developing boundary layer are presented and compared to the temperature variation in a free stream away from the wall boundary layer. Analyses of temperature increase in such layers clearly indicate that the self-ignition of the mixture happens in the boundary layer ahead of the propagating flame front. New experimental results obtained recently by a research group from the A. V. Luikov Heat and Mass Transfer Institute in Minsk, Belarus, combined with previously conducted theoretical analyses and numerical simulations, show clearly and unambiguously that the origin of the “explosion in the explosion”, postulated by A. K. Oppenheim in 1966, is always responsible for the Deflagration-Detonation Transition (DDT) in gases and is located in the boundary layer ahead of the accelerating flame front. | boundary layer, ignition detonation initiation, combustion, explosion in the explosion, detonation, deflagration-detonation transition (DDT). | 2022 | 2 | 267 | 1-12 | 10.2478/TAR-2022-0007 | ||
| José M. Desantes, Ricardo Novella, Luis M. García-Cuevas and Marcos Lopez-Juarez | Feasibility study for a fuel cell-powered unmanned aerial vehicle with a 75 kg payload. | Among the possible electric powerplants currently driving low-payload UAVs (up to around 10 kg of payload), batteries offer certain clear benefits, but for medium-payload operation such as aerotaxis and heavy-cargo transportation UAVs, battery capacity requirements restrict their usage due to high weight and volume. In light of this situation, fuel cell (FC) systems (FCS) offer clear benefits over batteries for the medium-payload UAV segment (> 50 kg). Nevertheless, studies regarding the application of FCS powerplants to this UAV segment are limited and the in-flight performance has not been clearly analysed. In order to address this knowledge gap, a feasibility analysis of these particular applications powered by FCS is performed in this study. A validated FC stack model (40 kW of maximum power) was integrated into a balance of plant to conform an FCS. As a novelty, the management of the FCS was optimized to maximize the FCS efficiency at different altitudes up to 12500 ft, so that the operation always implies the lowest H2 consumption regardless of the altitude. In parallel, an UAV numerical model was developed based on the ATLANTE vehicle and characterized by calculating the aerodynamic coefficients through CFD simulations. Then, both models were integrated into a 0D-1D modelling platform together with an energy management strategy optimizer algorithm and a suitable propeller model. With the preliminary results obtained from the FCS and UAV models, it was possible to ascertain the range and endurance of the vehicle. As a result, it was concluded that the combination of both technologies could offer a range over 600 km and an endurance over 5 h. Finally, with the integrated UAV-FCS model, a flight profile describing a medium altitude, medium endurance mission was designed and used to analyse the viability of FC-powered UAV. The results showed how UAVs powered by FCS are viable for the considered aircraft segment, providing competitive values of specific range and endurance. | Unmanned Aerial Vehicle, fuel cell, hydrogen, optimization | 2022 | 2 | 267 | 13-30 | 10.2478/TAR-2022-0008 | ||
| Kai San Hon, Stanislav Karpuk, Daqing Yang and Ali Elham | Development of a flight simulator for conceptual aircraft design and sizing. | This article describes the development of a flight simulator module within the ADEMAO aircraft design framework to investigate the effects of novel airframe and propulsion technologies on new generations of aircraft. Methods used to develop and integrate the fight simulator into the overall design framework are described. The simulator is validated based on existing data from the Convair CV-880M and is then used to analyze an example case of a conceptual medium-range aircraft with advanced airframe technologies designed in the Sustainable and Energy-Efficient Aviation research cluster at the Institute of Aircraft Design and Lightweight Structures at the Technische Universität Braunschweig. Results show the deficiencies of the medium-range aircraft in short-period pitch and Dutch roll performance, and recommendations for modifications to the conceptual medium-range aircraft are drafted. | flight dynamics, flight simulation, aircraft design | 2022 | 2 | 267 | 31-61 | 10.2478/TAR-2022-0009 | ||
| Paweł Głowacki, Piotr Kalina and Michał Kawalec | Comparing methods of calculating aircraft engine emissions of harmful exhaust components during the takeoff and landing cycle in the airspace of an airport. | An airport authority needs accurate information about the actual amount of harmful emissions being generated within its airspace, to be able to take measures leading to their reduction. This article presents two methods for estimating the amount of these emissions from aircraft engines during the take off and landing cycle (LTO) in the airspace of a medium-sized airport: one based on the total amount of the aircraft annually operated in it, and a second, more precise, one for a specific airline annually operating at this airport. The conclusions stemming from the comparison of these methods can support the introduction of operational and technical procedures reducing harmful emissions in the airport airspace during LTO cycle. | harmful emissions, exhaust gases, aircraft engines, LTO cycle | 2022 | 2 | 267 | 62-68 | 10.2478/TAR-2022-0010 | ||
| Valentyn Uchanin | Eddy current techniques for detecting hidden subsurface defects in multilayer aircraft structures. | In-service non-destructive inspection (NDI) is a very important part of the aircraft maintenance program that minimizes aircraft breakdowns due to the fracture of critical components. The eddy current (EC) NDI method is one of the most applicable methods for this purpose, due to its high sensitivity to fatigue cracks and corrosion damage in the main structural materials. In this paper, selective double differential type EC probes characterized by the enhanced possibility of detecting subsurface cracks initiated by fatigue or stress corrosion phenomena are presented. For different applications, a family of double differential type EC probes was developed with different sizes (from 5 to 33 mm) and different spatial resolutions. These types of probes are characterized by different operational frequencies in a wide frequency range (from 0.2 kHz to 1.0 MHz), high penetration depth and unique sensitivity to subsurface defects of different types (like elongated fatigue cracks or local corrosive pitting), and a high level of specific noise suppression concerned with the scanning inspection procedures. The EC probes proposed were investigated as effective tools for characteristic aircraft applications concerned with subsurface defect detection in multilayer structures, such as the detection of cracks in the second layer of a riveted two-layer structure or cracks initiated on the side surface of a multilayer structure with the suppression of the reinforcing hoop influence; the detection of subsurface defects in arc welding with a rough surface; the detection of cracks through repair patches fabricated from aluminum alloy or carbon fiber reinforced plastic, etc. These techniques create remarkable possibilities for the well-timed detection of dangerous damage without disassembling the aircraft structure or removing protective coating. | aircraft structure, subsurface defect, eddy current, fatigue crack, corrosion, operational frequency, repair patch. | 2022 | 2 | 267 | 69-79 | 10.2478/TAR-2022-0011 | ||
| Igor Ohanian and Sergiy Yepifanov | Diagnostic model of aircraft turbine engine governor pump | This paper presents a mathematical model for a hydromechanical fuel governor pump, to be used in parametric diagnostics. The design and operation of the governor are described. The main requirements of the model are formulated, its structure is determined, corresponding to the specifics of the diagnostic task, and assumptions to make the model simpler are presented (single-dimensional flow and absence of heat exchange). The presented model consists of idealized elements with lumped parameters (such as pressure and mass consumption of the working fluid), accounting for the compressibility of the substance and the design arrangement of the governor (presence of mechanical rests, metering orifices of complex shapes, relay switchers, etc.). Equations of elements with lumped parameters, linked by hydraulic channels in one node, are presented. The model – a system of first-order differential-algebraic equations – is solved and the parameters of the governor pump are determined for different steady-state and transient operation modes. We compare our results to the requirements for the corresponding parameters outlined in the Engineering Specifications. The model is matched to the specifications by correcting setting parameters (tightening of elastic springs, areas of throttles, etc.), and a method of initial model linearization is developed. Based on the results, we conclude that our model can be used as a diagnostic algorithm for a governor pump, at the testing and development stages, during manufacturing, repair and maintenance. | aircraft turbine engine, hydromechanical governor, governor pump, diagnostics, model, influence coefficients. | 2022 | 2 | 267 | 80-95 | 10.2478/TAR-2022-0012 | ||
| Michael Rohdenburg, Fabian Runge, Matthias Haupt, Lennart Markgraf, Peter Horst and Sebastian Heimbs | Holistic Low-Effort Model for Damage Tolerance Analysis in Preliminary Design. | The paper presents reduced order results for three different realistic scenarios with respect to the damage tolerance behaviour. The scenarios are dedicated to stiffened structures and feature the fuselage side panel, the upper fuselage panel and a lower wing panel. A wide range of parameter variations is discussed and the influence on the inspection interval is shown. Results may be used both in preliminary aircraft design and structural optimisation. | damage tolerance, stiffened structure, reduced order methods. | 2022 | 3 | 268 | 1-20 | 10.2478/TAR-2022-0013 | ||
| Adam Antczak, Maciej Lasek and Krzysztof Sibilski | Efficient Positioning of Two Long-Range Passenger Aircraft in Formation Flight. | In today's world, each airline is forced to look for new savings opportunities. One of the methods may be the use of formation flights in daily flight operations, which may allow a reduction in fuel consumption by several percentages. The paper presents the genesis of how the consideration of such flights and the possibility of their implementation in an airline had started. The leader's plane generates vortices, which, with the proper alignment of the planes to one another, can reduce the drag on the wingman. However, the wrong position may not only have no positive effect but also may be a threat to stable wingman flight. The article presents a method of using these vortices in such a way as to have a positive impact on the aerodynamics of the wingman. A favourableposition in the vertical and horizontal axes will be determined in relation to the vortex generated by the leader's plane in order to obtain the greatest benefit in reducing fuel consumption.. The paper presents an operational analysis of the possibility of maintaining such a distance to obtain profit on fuel but also to ensure the highest level of safety of the flight. | formation flight, optimisation, strip theory, dynamics of flight. | 2022 | 3 | 268 | 21-31 | 10.2478/TAR-2022-0014 | ||
| Wiktor Wyszywacz | Easy Risk Assessment for Unmanned Aircraft Systems: Outline of the Method. | The key element of safety systems in air transport is risk management. The rules for the safety of unmanned aircraft system (UAS) operations are established by the Commission Implementing Regulations (European Union [EU]) and national regulations. Risk assessment is the foundation of all activities. The broadest scope is covered by the special category of flights for which the Joint Authorities for Rulemaking on Unmanned Systems (JARUS) developed the Specific Operations Risk Assessment (SORA) analysis. The primary purpose of the SORA analysis is to create a comprehensive safety portfolio, which is attached to the National Aviation Authority (NAA) application for permission to perform specific category flights. Aviation authorities may accept the use of other risk analysis methods to demonstrate risk reduced to a safe level. Easy Risk Assessment (ERA) for UASs is an attempt to determine the risk for UAS flights in a simple way by considering a range of factors influencing risk management similar to the SORA. It is an uncomplicated method, determines threats and their sources, provides risk management, allows the determination of the level of risk tolerance. The ERA is intended to be an alternative to the SORA methodology to carry out risk assessment. | easy risk assessment, UAS, safety, threats, risk analysis. | 2022 | 3 | 268 | 32-47 | 10.2478/TAR-2022-0015 | ||
| Vitaly Dudnik and Victor Karabut | Fuel Weight Determination of Ultralight and Very Light Helicopters at the Preliminary Design Stage. | In recent years, a large number of one- to two-seat-type helicopters have appeared, raising the possibility to determine the dependencies inherent in these classes. Such dependencies are extremely necessary at the preliminary design stage, in particular, for determining the fuel mass. The relative mass of fuel depends on the required range and flight time of the helicopter, as well as on the characteristics of the engine and the required power of the helicopter. Based on statistical data, the article presents an approximate relation of the hourly fuel consumption of engines that small helicopters are equipped with. The additional amount of fuel required to complete missions has also been determined. General dependency of the fuel weight that can be used at the preliminary design stage is presented according to the analysis results. | ultralight helicopter, very light helicopter, fuel consumption, preliminary design. | 2022 | 3 | 268 | 48-55 | 10.2478/TAR-2022-0016 | ||
| Maciej Osiewicz, Sławomir Cieślak and Marcin Bielecki | Determination of the Geometric Properties of a Jet Engine Fan Blades Based on Modal Vibration Testing. | The article presents an experimental method of determining the geometric properties of jet engine rotor airfoils based on modal vibration testing. The procedure is based on adjusting the results of analytical calculations to the laboratory outcomes. Experimental tests were carried out on a set of 20 jet engine fan blades made of AL7022-T6 aluminium alloy. Each blade differed in weight and geometric dimensions within the accepted design tolerance. Numerical analysis of five airfoils that differed in thickness was performed. Modal vibration test results were summarised and compared with the results obtained by the numerical method. The comparison revealed a high similarity of the frequency and form of vibrations acquired by numerical simulation for each of the blades in relation to the executed vibration testing. Based on the verification of the theoretical model with the results obtained through experimental testing, conclusions were drawn about the object's dynamic behaviour and its technological quality and geometric properties, whereby each of airfoil was probably thinned. | blade vibration, modal analysis, finite elements, design, aviation. | 2022 | 3 | 268 | 56-73 | 10.2478/TAR-2022-0017 | ||
| Agnieszka Kwiek, Krzysztof Bogdański, Jarosław Hajduk and Andrzej Tarnowski | Technique Used to Perform Rocket-Plane Free-Flight Tests. | This paper includes description of the technique that was applied for free-flight (drop) tests of the rocket-plane scaled model. The main aim of the experiment was to validate the numerical approach to be used to simulate the gliding flight of the rocket-plane, especially the transition between high to low angles of attack and the rocket-plane response to control. The primary goal of this paper is to show what kind of challenges must be addressed when planning the flight test campaign. This paper includes description of how the rocket-plane model was scaled and built, the model preparation, experimental design and flight procedure. This paper shows an overview of how the experiment can be planned for different scenarios and the lessons learned during the deep stall free-flight tests. | aerospace engineering, drop tests, free-flight test, rocket-plane. | 2022 | 3 | 268 | 74-90 | 10.2478/TAR-2022-0018 | ||
| Gazmend Mavraj, Jil Eltgen, Tim Fraske, Majed Swaid, Jan Berling, Ole Röntgen , Yuzhuo Fu and Detlef Schulz | A Systematic Review of Ground-Based Infrastructure for the Innovative Urban Air Mobility. | The increasing level of urbanisation and traffic congestion promotes the concept of urban air mobility (UAM), which has become a thriving topic in engineering and neighbouring disciplines. The development of a suitable ground-based infrastructure is necessary to supply these innovative vehicles, which mainly includes networks of take-off and landing sites, facilities for maintenance, energy supply, and navigation and communication capabilities. Further requirements comprise robust business and operating models for emerging service providers and regulatory frameworks, particularly regarding safety, liability and noise emissions. The objective of this study is to provide an overview of the current results and developments in the field of UAM ground-based infrastructure by conducting a systematic literature review (SLR) and to identify the most relevant research gaps in the field. For the systematic literature analysis, our search string contains vertiports and the equivalents, UAM and equivalents, and search phrases for the individual domains. In the final analysis 64 articles were included, finding a strong focus on simulations and vertiport networks, while specific case studies and related aspects like automated MRO and urban planning appear less frequently. Therefore, this article provides insights for a more holistic perspective on challenges and necessities of future UAM. | air mobility, ground-based infrastructure, systematic literature review, vertiport, air taxi. | 2022 | 4 | 269 | 1-17 | 10.2478/TAR-2022-0019 | ||
| Salvo Marcuccio, Matteo Gemignani and Giuseppe Cataldi | Science, Technology and Systems Engineering Educational Activities with Stratospheric Balloons. | In 2021, the Space Systems Laboratory of the University of Pisa (UniPi) started a student-oriented high-altitude ballooning programme intended to provide an opportunity for hands-on experience in support of the teaching of scientific and technical courses. The programme provides mentoring on scientific, technical and management issues, along with financial support and assistance with integration and launch on a sounding balloon platform. The goal is to conduct flying experiments in the stratosphere, retrieve them after landing and process the results; by doing so, the students experience all phases of a scientific mission project, from conceptual design to realisation, operations and post-flight analysis. Following a call for proposal open to all students of the UniPi across all study areas, three experiments were selected featuring multidisciplinary teams. This paper summarises the features of the programme’s first edition and presents the main lessons learned. | high-altitude ballooning, stratospheric platform, student experiment, sounding balloon. | 2022 | 4 | 269 | 18-27 | 10.2478/TAR-2022-0020 | ||
| Jacek Mieloszyk, Emmanuel Zenou, Gustavo Alonso, Franco Bernelli-Zazzera and Joris Melkert | The Role of PEGASUS in the European Aeronautics and Space Universities Exchange of Students and Professors. | The objective of all universities in the Partnership of a European Group of Aeronautics and Space UniversitieS (PEGASUS) network is to offer highly relevant educational and research programmes and thereby attract the best students and scientists. Coordinated developments, exchange of students and staff and innovation are the basis on which these objectives are achieved. The paper shows how PEGASUS is contributing to the increase in students’ mobility among the partner universities, providing a tool to visualise, illustrate and quantify these flows. The tool provides a mapping of agreements and flows, using data based on a questionnaire sent to all PEGASUS partners. The data is available from the courses offered in the years 2012–2019 and has been prepared for display in the Google Earth application. It is a very flexible tool that allows for multiple searching criteria: per university of origin, per university of destination, per country, per course, etc. The current state of international exchange is shown, emphasising the noticed strengths and weaknesses. Initiatives taken to improve the weaknesses in cooperation are discussed and summed up with final conclusions. | aerospace education, students’ mobility, professors’ mobility. | 2022 | 4 | 269 | 28-36 | 10.2478/TAR-2022-0021 | ||
| Juan José Morillas-Guerrero | An Analysis of the Spanish Aerospace Sector: the Case of the Start-Up Ecosystem in Madrid. | After launching the First Survey on the Spanish aerospace industry, important results were obtained, which helped to delve into the roots of the digital transformation (DT) of this sector, focussing on the Madrid region (Spain). From this type of study, which had not been carried out until now at the regional level, extremely interesting data have emerged that allow us to define the situation of Madrid companies in the aerospace sector. We have characterised and quantified the influence of what we have called ‘transformative enablers’. We have also analysed their relationships with the general characteristics of the companies, such as location, number of employees, legal form or type of company. We also obtained interesting conclusions about the role of respondents within organisations to discover the ‘capillarity’ of their situations and thus understand the degree of DT in terms of whether they achieve the so-called Industry 4.0 (Fourth Industrial Revolution) specifications. Finally, we have carried out a monographic study of the disruptive innovations within the start-up ecosystem to understand its definition and scope in the aerospace industry as a precursor of the latter’s DT. | digital transformation, aerospace, start-up ecosystem, enablers, Madrid. | 2022 | 4 | 269 | 37-47 | 10.2478/TAR-2022-0022 | ||
| Franco Bernelli-Zazzera, Giorgio Guglieri, Salvo Marcuccio, Francesco Marulo, Paola Nardinocchi and Paolo Tortora | Evolution of (Aero)Space Engineering Studies in Italy in the Past 20 Years. | The paper presents the evolution and trends in the Master’s-level studies in aerospace engineering in Italy, looking at the past 20 years. In the year 2000, a major reform of the higher education in engineering took place in Italy, with the introduction of the so-called ‘Bologna system’ and the clear separation of Bachelor’s and Master’s degree studies. With this reform, a relatively high flexibility was given to universities to define their programme structures. The ministerial rules defined only broad subject areas within which courses and credits should be allocated. This reform allowed the diversification of the educational profile within each university and, even more relevant, allowed the creation of mobility across the country between Bachelor’s and Master’s study programmes. The paper will show the basic facts and figures in the six Italian universities participating in the Partnership of a European Group of Aeronautics and Space UniversitieS (PEGASUS) network (Politecnico di Milano, Politecnico di Torino, Università di Pisa, Università degli Studi di Napoli ‘Federico II’, Sapienza Università di Roma and Alma Mater Studiorum – Università di Bologna), elaborating on the impact of the potential workforce for the sector. Data have been collected from the official open data repository of the Italian Ministry of University, supplemented by information provided by the six universities under analysis. The comparative analysis shows two major results: the positive impact of the reform on the overall Italian higher education and, specifically, a greater appreciation of the aerospace curricula proposed in accordance with the new system. | aerospace engineering education, aerospace master, space engineering. | 2022 | 4 | 269 | 48-58 | 10.2478/TAR-2022-0023 | ||
| Sergiy Yepifanov and Oleksiy Bondarenko | Development of Turboshaft Engine Adaptive Dynamic Model: Analysis of Estimation Errors. | One of the most perspective directions of aircraft engine development is related to implementing adaptive automatic electronic control systems (ACS). The significant elements of these systems are algorithms of matching of mathematical models to actual performances of the engine. These adaptive models are used directly in control algorithms and are a combination of static and dynamic sub-models. This work considers the dynamic sub-models formation using the Least Square method (LSM) on a base of the engine parameters that are measured in-flight. While implementing this function in the (ACS), the problem of checking the sufficiency of the used information for ensuring the required precision of the model arises. We must do this checking a priori (to determine a set of operation modes, the shape of the engine test impact and volume of recorded information) and a posteriori. Equations of the engine models are considered. Relations are derived that determine the precision of parameters of these models’ estimation depending on the precision of measurement, the composition of the engine power ratings, and durability of observations, at a stepwise change of fuel flow. We present these relations in non-dimensional coordinates that make them universal and ready for application to any turboshaft engine. | turbine engine, turboshaft, gas generator, dynamic model, engine time constant, identification, estimation error, design of experiment. | 2022 | 4 | 269 | 59-71 | 10.2478/TAR-2022-0024 | ||
| Sławomir Cieślak and Wiesław Krzymień | Vibroacoustic Helicopter Impact on Elevated Helipad. | A helicopter landing and taking off on an elevated helipad is a source of noise that affects the environment and causes vibrations of the landing pad or the building infrastructure. Vibrations are also excited by the air stream flowing through the main rotor and transferred to the landing pad by contact of the helicopter chassis. Vibrations are transferred to the building through the structure of the helipad. Depending on the damping properties of the structure and the vibro-isolating elements used, vibrations can be felt in rooms used by people and also transmitted to devices located in the building. The subject of the study described in this paper is the vibroacoustic effects of an EC-135 helicopter on an elevated landing pad during landing, standstill with the propulsion system engaged and take-off. Measurements of vibrations and noise were made at points located both on the landing pad and in the building. The paper presents selected results of measurements in various phases of flight and helicopter manoeuvres. The frequency analyses of the fragment of the measurement data for the flight phase, in which the highest levels of impact were recorded, were also performed and included. The results are presented as graphs and annotated. | mechanical engineering, helipad, helicopter, noise, vibrations, impact. | 2023 | 1 | 270 | 1-9 | 10.2478/TAR-2023-0001 | ||
| Vladimir Aleksandrovich Kasianov and Andriy Viktorovich Goncharenko | The Simplest Models of the Macroeconomics Dynamics in a Composition with the Principle of the Subjective Entropy Maximum. | This paper proposes a solution to a certain macroeconomic model. A multi-alternative problem of aviation transportation optimal organisation in conditions of uncertainty of the subjective preference functions is considered. Conditional optimisation of the objective functional containing the entropy of the individuals’ operational effectiveness functions preferences is carried out in the framework of the simplest macroeconomic problem. The principle of the Solow and Cobb–Douglas models, similar to the approach adopted for the estimation of economic growth, is modified with the subjective entropy maximum principle. The advantages of the described optimisation approach are demonstrated in the generalised terms of the operational effectiveness functions for aviation transportation organisation. | aviation transportation, operational effectiveness, objective functional optimisation, simplest macroeconomic problem, entropy. | 2023 | 1 | 270 | 10-21 | 10.2478/TAR-2023-0002 | ||
| Iuliia Lysenko, Yurii Kuts, Valentyn Uchanin, Anatoliy Protasov, Valentyn Petryk and Alexander Alexiev | Using the Pulsed Eddy Current Techniques for Monitoring the Aircraft Structure Condition. | It is known that during operation, the aircraft construction materials are exposed to significant mechanical loads and changes in temperature for a very short period of time. All this leads to various defects and damages in the aircraft assemblies and units that need to be inspected for the safe operation of the aircraft, their assemblies, and units. In some cases, the implementation of inspection or diagnostic is accompanied by the emergence of technical difficulties caused by the large size of the aircraft assemblies or units and limited access to their local places. Under such conditions, ensuring the possibility of diagnosis in hard-to-reach places of the object becomes especially important. The problem can be solved by applying wireless technologies. It allows spatial separation of the probes and the signal processing units, which simplifies the scanning of the surfaces of the large assemblies and units in hard-to-reach places. In this article, the description of the developed wireless system of eddy current inspection for aircraft structural materials is given. Experimental results of object scanning are given in the form of a distribution of the values of probe signal informative parameters (amplitude, frequency and decrement) along the object coordinates. | aviation material inspection, signal characteristics, information parameters, scanning, c-scan. | 2023 | 1 | 270 | 22-31 | 10.2478/TAR-2023-0003 | ||
| Mariachiara Gallia, Alessandro Carnemolla, Marco Premazzi and Alberto Guardone | Optimisation of a Nacelle Electro-Thermal Ice Protection System for Icing Wind Tunnel Testing. | Aircraft are equipped with ice protection systems (IPS), to avoid, delay or remove ice accretion. Two widely used technologies are the thermo-pneumatic IPS and the electro-thermal IPS (ETIPS). Thermo-pneumatic IPS requires air extraction from the engine negatively affecting its performances. Moreover, in the context of green aviation, aircraft manufacturers are moving towards hybrid or fully electric aircraft requiring all electric on-board systems. In this work, an ETIPS has been designed and optimised to replace the nacelle pneumatic-thermal system. The aim is to minimise the power consumption while assuring limited or null ice formation and that the surface temperature remains between acceptable bounds to avoid material degradation. The design parameters were the length and heat flux of each heater. Runback ice formations and surface temperature were assessed by means of the in-house developed PoliMIce framework. The optimisation was performed using a genetic algorithm, and the constraints were handled through a linear penalty method. The optimal configuration required 33% less power with respect to the previously installed thermo-pneumatic IPS. Furthermore, engine performance is not affected in the case of the ETIPS. This energy saving resulted in an estimated reduction of specific fuel consumption of 3%, when operating the IPS in anti-icing mode. | in-flight icing, ice protection systems, optimisation, genetic algorithms, nacelle. | 2023 | 1 | 270 | 32-44 | 10.2478/TAR-2023-0004 | ||
| Agnieszka Bondyra and Tomasz Łusiak | Analysis of Strenght Properties of Carbon Fibre-Reinforced Composites. | Tensile tests were carried out on three series of composite samples according to the ASTM (American Society for Testing and Materials). The materials tested were characterised by using the same manufacturing method. The specimens were hand-laminated using MGS L285/H285 epoxy resin. The feature that differentiates the structure of each laminate series is the type of reinforcement. A biaxial fabric IMS65 CTLX with a 0/90 arrangement was used to reinforce the C-series composite specimens; for the D-series, a symmetrical fabric Interglass 02037 with a 0/90 weave was used, and for the E-series specimens, a modular fabric IMS65 with a 45 weave was used. The share of composites in the manufacture of construction products is steadily increasing. This is due to the development of new technologies for manufacturing composite elements and composites, with properties that are more and more in line with the requirements of the industry resulting from technological progress. Composite products have to meet many performance requirements. Tensile testing is used to determine some of the key mechanical properties of laminates. Fibre-reinforced polymer (FRP) composites have been used in various engineering structures for many decades. Their unique physical and mechanical properties make them a well-known, most produced and most widely used type of composite materials. In the case of fibre composites, it is the fibres that take over the basic stresses and are responsible for achieving the appropriate stiffness and strength, while the matrix ensures optimum use of the properties of the fibres and gives shape to the manufactured element. The mechanical properties of the composite and its failure process are fundamentally dependent on the high strength of the fibres, the stiffness of the matrix and the strength of the fibre-matrix interface. | polymer composites, fibre composites, static tensile testing, carbon fibres, fibre-matrix interface. | 2023 | 1 | 270 | 45-66 | 10.2478/TAR-2023-0005 | ||
| Małgorzata Wojtas, Przemysław Wyszkowski, Mirosław Mądro, Maciej Osiewicz and Paweł Kmita | Test Stand for Propellers and Rotors in VTOL Drone Systems. | The paper proposes a stand that can be used for the testing of propellers and rotors with diameters up to 2.4 m, whose areas of application encompass, inter alia, vertical takeoff and landing (VTOL) type multi-rotor drone systems. The presented solution allows for testing propellers in systems with electric motors. To a certain extent, it is possible to achieve an increase in the measuring range by changing electric motors, power supply systems and measuring sensors. The paper presents several solutions for test stands that can be applied in the testing of propeller parameters, and commercially available propellers have also been deployed in the testing routines. The paper briefly presents the concept of the stand and its design, as well as the principle of operation and structural calculations underlying its functioning, after which the numerical model of the test stand is explained. The article then demonstrates the particular results of the test stand model’s functioning using the EMRAX 188 electric motor and two propellers, namely a commercial Aerobat propeller and a composite propeller designed and manufactured at the Łukasiewicz – Institute of Aviation. Thus, the paper presents both the theoretical results that follow from the model and the results of experimental research. | synchronous motors, numerical model, VTOL, propeller, test stand. | 2023 | 1 | 270 | 67-85 | 10.2478/TAR-2023-0006 | ||
| Nezar Sahbon, Maciej Michałów, Siddharth Murpani, Paulina Żurawka and Kacper Kaczmarek | CFD Study of Base Drag of the Grot Rocket. | Propulsion system operation is known to affect the aerodynamic characteristics of rockets. Specifically, the net axial force acting on a rocket in flight cannot be precisely obtained by combining the static thrust with drag values computed for a rocket with an inactive motor. One of the main reasons for this is the influence of motor operation on pressure at the base of the rocket. The aim of this paper is to investigate the effect of motor operation on the aerodynamic parameters of the Grot sounding rocket developed by the Students’ Space Association, Warsaw University of Technology. The study consists of two series of axisymmetrical computational fluid dynamic simulations of flow around the rocket—one with the motor being non-operational and the other with active thrust. In the post-processing phase, the axial force acting on various components of the rocket is computed, with an emphasis on the base and nozzle exit sections. Quantitative and qualitative differences between the cases with and without active thrust are highlighted and discussed. The obtained results are compared to a semi-empirical model found in the literature. Finally, a semi-empirical base drag model is proposed for use in Grot flight simulation. | base drag, computational fluid dynamics, rocket aerodynamics, sounding rockets, solid rocket propulsion | 2023 | 2 | 271 | 1-16 | 10.2478/TAR-2023-0007 | ||
| Vitaly Dudnik and Victor Karabut | Ultralight and Very Light Helicopter Rotor Data. | In recent years, a significant number of one- and two-seat lightweight helicopters have come into existence, and this makes it possible to analyse parameters and determine dependencies for this class of helicopters. The knowledge of such dependencies is necessary at the preliminary design stage. The analysis performed in this paper and its comparison with the statistical data of all categories of helicopters made it possible to determine the necessary corrections in the methods of determining the parameters of the helicopter’s rotor systems. | ultralight helicopter, main rotor, blade, preliminary design | 2023 | 2 | 271 | 17-24 | 10.2478/TAR-2023-0008 | ||
| Vladimir Kasianov and Andriy Goncharenko | Development of the Airline Business Macroeconomics Dynamics Models. | This paper proposes a solution to a certain macroeconomic model. A multi-alternative problem of aviation transportation optimal organisation in conditions of uncertainty of the subjective preference functions is considered. Conditional optimisation of the objective functional containing the entropy of the individuals’ operational effectiveness functions preferences is carried out in the framework of the simplest macroeconomic problem. The principle of the Solow and Cobb–Douglas models, likewise for economic growth, is modified with the Subjective Entropy Maximum Principle. The advantages of the described optimisation approach are demonstrated in generalised terms of the operational effectiveness functions for aviation transportation organisation. | aviation transportation, operational effectiveness, objective functional optimisation, simplest macroeconomic problem, entropy | 2023 | 2 | 271 | 25-32 | 10.2478/TAR-2023-0009 | ||
| Paweł Grygorcewicz and Konrad Raczko | Issues in Designing of Mechanical Parts Models in CAD Programs. | The article describes methods of creating mechanical parts in 3D programs, together with presenting very significant issues that emerge during the designing process employed in this creation, the main goal being to show the most important factors playing a role in the design process. Resultantly, it is ascertained that the most important factors needing to be considered by a designer are, inter alia, mass of the parts, strength, and kind of material. The article indicates the different types of parts used in different load cases, the objective being to explain various aspects relevant to design. The parts were different in particular in their nature of work and purpose. The article also presents illustrations after finite element method (FEM) analysis. It was important and interesting to observe how the stress in the tested parts was distributed under load and how the structure changed when the used material changed. The stress had a very large influence for the design of every airplane part; a case in point would be the illustration available from the lever example. The main role of this article is to describe different designing factors that could help a specialist create new designs in the future. | designing, design, model 3D, mechanical parts, lever, support | 2023 | 2 | 271 | 33-44 | 10.2478/TAR-2023-0010 | ||
| Taras Yanko, Roman Datsenko and Hanna Karpenko | Possibilities of Using Low-Density C-C Composites for Thermal Protection of Small Unmanned Aerial Vehicles. | The study demonstrates the possibilities of using, as well as the features associated with the use of, unmanned aerial vehicles (UAVs) for military and peaceful purposes. Information is provided on the need to use components that would contribute towards ensuring thermal protection against modern laser weapons. The requirements for such materials are given, according to the field of application of the UAV. An analysis of the available materials that can be used to create thermal protection of UAVs against laser weapons is provided. The thermophysical characteristics of various materials are presented. The work presents technological features of production and properties of low-density carbon–carbon composite materials (CCCM). It is proposed to consider the prospects of using CCCM materials for not only the UAV structural components but also other purposes. | carbon–carbon composite material, low-density, fibre, laser weapon, carbonisation | 2023 | 2 | 271 | 45-57 | 10.2478/TAR-2023-0011 | ||
| Witold Polański | Modelling of the Monolithic Stiffener Forming Process from a Peak Thermoplastic Composite Matrix Using Pam-Form Software. | The growing use of thermoplastic composites in aviation, automotive, sports and medical industries is forcing the development of processing technology. Due to the properties of thermoplastic composite materials, their shaping is subject to many restrictions. For this reason, it is not always possible to obtain components with complex geometry and adequate quality. By using numerical analysis and experience in the production of parts using hot pressing technology, we are able to predict the course of the process and the behaviour of the material during formation. The article describes how to build a model for numerical analysis of the process of thermoforming monolithic inspection door stiffening for an ILX-34 aircraft using a toray Cetex® TC1225 carbon composite material with a thermoplastic polyaryletherketone (PAEK) matrix. Pam-Form v2019.0 software version V1.9.N was used for modelling. the results of the analysis were compared with those of the part produced by the Institute of Aviation, Łukasiewicz Research Network. | thermoplastic composite, thermoforming; fabric, PAEK, numerical analysis, monolithic part, aviation | 2023 | 2 | 271 | 58-75 | 10.2478/TAR-2023-0012 | ||
| Diane Uyoga and Ronald Bonuke | Role of Personal Commitment in Association Between Aerospace Education and Service Experience | This study investigates whether personal commitment moderates the effect of aerospace education on service experience through quality design. A cross-sectional study using a close-ended questionnaire was administered to a sample of 174 aviation students of Moi University, Kenya. Moderated mediation analyses were conducted using the PROCESS macro in order to investigate the relationship among variables. The results showed that the association between aerospace education and service experience was significant, and this association was mediated by quality design. The mediated effect of quality design was moderated by personal commitment. Based on the findings, companies involved in aviation should focus on improving the good environment of the service encounter (i.e., education, quality design and commitment) to enhance service experience. The findings made a contribution in terms of allowing us to understand the factors that can enhance service experience in the aviation industry. | aerospace education, quality designs, personal commitment, service experience, moderated mediation | 2023 | 3 | 272 | 1-15 | 10.2478/TAR-2023-0013 | ||
| Jan Kierski, Arthur Pazik and Dawid Cieśliński | Solid Rocket Boosters Separation System Development for the ILR-33 AMBER 2K Rocket | The paper presents the development process of the solid rocket boosters (SRBs) separation system of the ILR-33 AMBER 2K rocket. A redesign of the system was required due to the development of new, larger SRBs. The main system requirements were transmission of forces and moments between the SRBs and the main stage, execution of the separation process at a given moment in flight and mechanical integration simplification. A set of aerodynamics calculations were performed. With the use of computational fluid dynamics software, forces acting on the booster during separation for several angles of attack, as well as the critical booster deflection angle, have been determined. Next, a mathematical model was created to define the load spectrum acting on the system during the flight and separation phases, covering both static and dynamic loads. All the internal and external force sources were considered. A series of motion dynamics simulations were conducted for representative flight cases. Then, the system operational parameters were verified with the use of dedicated ground test facilities. Necessary calibrations of the mathematical model were then implemented, leading to a high level of confidence with the empirical data obtained, thereby leading to a successful system qualification for the flight campaign. | sounding rocket, solid rocket booster, ILR-33 AMBER 2K, modelling;flight dynamics; ground testing | 2023 | 3 | 272 | 16-27 | 10.2478/TAR-2023-0014 | ||
| Konstanty Skalski, Grzegorz Mońka and Ryszard Filipowski | Description of Residual Stress Distribution in the Surface Layer After Heat Treatment and Shot Peening | The stress distribution function in the surface layer is created as a result of using stress measurements on the surfaces of C45 steel samples after shot peening. Stresses were measured by X-ray diffraction with the use of the PSF-3M device from the Rigaku Company. For measuring residual stresses, subsequent layers of the top surface of the material were used as a basis, and these were obtained through electrochemical etching. The test results i.e. distance into the material, sample hardness, shot type, stress) were entered into the stepwise multiple regression program. A record of residual stresses was obtained in the form of the second-degree regression function of three independent variables with interactions. The obtained analytical form of the residual stress function was used in the FUNVAL3.EXE program to calculate the tabular values of stresses permeating into the material. For the analytical description of the stress distribution, the REGPOLY.EXE regression program was used, which creates a polynomial functional form of the residual stress distribution. The plot form of the residual stress distribution was obtained using the EXCEL Microsoft Office 2000 program. | X-ray diffractometer, measurement of stresses, psi sine square method, metal crystal lattice, wave beam diffraction, pneumatic shot peening, multiple regression, planned experiment | 2023 | 3 | 272 | 28-39 | 10.2478/TAR-2023-0015 | ||
| Reham Reda, Yasmeen Ahmed, Islam Magdy, Hossam Nabil, Mennatullah Khamis, Ahmed Refaey, Nada Eldabaa, Manar Abo Elmagd, Mohamed Abo Lila, Hady Ergawy, Alhussein Elgarf and Gerges Abed | Basic Principles and Mechanical Considerations of Satellites: A Short Review | Satellites are used for navigation, communication, oceanography, astronomy, etc. Satellites come in a diversity of sizes and forms. Depending on the satellite’s mission, different subsystems are used. These subsystems are installed inside a housing to protect them from the space environment. This housing, which is also known as the satellite primary structure or mechanical structure, is made of durable materials that can endure severe conditions during launch and in the orbit. The optimisation of satellite mass is crucial right now since satellites are losing mass every day to reduce the cost of manufacturing and launching. This review first introduces an overview of the satellite classifications and subsystems. Then, the different types of mechanical load analysis the satellite subjects itself to are demonstrated. The advanced approaches for promoting the performance of the mechanical structures of satellites are explored, with a spotlight on the effect of the optimisation parameters of isogrid and honeycomb sandwich structures on the mechanical performance of the satellite primary structure. The assembly, integration and testing (AIT) of the small satellite are briefly presented. Finally, the important potential designs to improve the mechanical performance of the satellite primary structure and the challenges of further research are summarised. | principles of satellites, primary structure, isogrid structure, honeycomb structure, mechanical load analysis, assembly, integration and testing | 2023 | 3 | 272 | 40-54 | 10.2478/TAR-2023-0016 | ||
| Оleksandr Grebenikov, Andrii Humennyi, Vasyl Loginov, Olexandr Dveirin and Dmytro Konyshev | Design Method for Pressurised and Non-Pressurised Tail Cargo Door’s Fairings Compartment in Transport Category Aircraft | The method for determining the main parameters of the tail cargo doors of transport category aircrafts is developed. Along with the means of preparation of the initial data needed to determine these parameters, a methodology for the ascertainment of these parameters has been described. An example based on an existing transport aircraft is considered. The following elements of information were gathered to encompass the initial data: the basic nomenclature of transported cargoes of the designed aircraft, its dimensions and weight, methods of loading and mooring and additional loading equipment. Also gathered were information pertaining to the necessary design, operational and regulatory parameters and data as landing gear type, its ‘kneeling’ system, rails of the upper loading equipment for loading and unloading, cargo trajectories during loading and landing, and requirements of the international regulatory organisations FAR, CS and AP. The principle of determining the dimensions of the cargo compartment, cargo floor and the hitting platforms, in the form of a ramp with a pressure door and ladders, is presented based on the initial data. Considering the described loading and unloading, as well as landing, operations, the dependence of the ramp length on the length of the cargo floor is ascertained. The correct formulation of these parameters was one of the most important tasks facing the present research, on the solution of which directly depend the operational characteristics of the future transport aircraft. A method for designing a cargo door fairings in the transport category aircraft fuselage tail part is also presented. The main features of the fairings compartment have been determined, together with those of its main components and their varieties, depending on the scheme of the cargo door. At the stage of preliminary design, the principles for determining the main parameters of the fairings compartments based on their design purpose are outlined. Information is also provided on the fairings compartment structural elements parameters selection: the axes of the fairings hinge, the selection of control cylinders and their installation, the parameters of the open and closed position locks, pressurisation and sealing of the fairings compartment. Concerning the design features of the fuselage tail section, various theories were applied in relation to the fairings compartment – made in cross-section with one radius (in the shape of a cylinder) and given in cross-section with two radii (double-deck). | fairings compartment, pressurised fairing, middle fairing, side flap, drove, fairing rotation axis, closed position locks | 2023 | 3 | 272 | 55-71 | 10.2478/TAR-2023-0017 | ||
| Michał Sekrecki | Cavitating Venturi as a Mass Flow Controller in a Deep Throttling Liquid Rocket Engine | The most common solutions for rocket engines are the single operation point (thrust level) units. Oxidiser and fuel mass flow rates and the oxidiser-to-fuel mass flow rate ratio (OFR) are some of the determinants of the thrust level. Based on these, planetary ascent and descent; space rendezvous; orbital manoeuvring, including orientation and stabilisation in space; hovering, hazard avoidance during planetary landing; and ballistic missile trajectory control propulsion systems could use throttleable liquid engines. Several engine throttling methods, such as supply pressure variation and variable injector area, can be applied. Among others, a cavitating venturi propellant regulatory valve is one of the most promising throttling method. This type of valve can provide steady mass flow, despite the downstream pressure disturbance (i.e. from the combustion chamber), which sustains a stable engine thrust as the mass flow is kept. The article presents the valve sizing method, design and prototype test results of the cavitating venturi valve that has potential for utilisation in a deep throttling rocket engine. Mass flow stability and repeatability are presented for valve operating points in the 10%–110% nominal mass flow range. Valve design optimisation, based on CFD, to sustain cavitation for a higher downstream-to-upstream pressure ratio is shown. | cavitating venturi, throttling, regulatory valve, HtP, ethanol, green propulsion | 2023 | 3 | 272 | 72-86 | 10.2478/TAR-2023-0018 | ||
| Witold Klimczyk, Adam Sieradzki | Airofil Tonal Noise Prediction Using Urans | Noise | To examine the feasibility of the laminar boundary layer (LBL), vortex shedding (VS) tonal noise modelling using unsteady Reynolds-averaged Navier–Stokes (URANS) was investigated for the non-symmetric S834 airfoil. A transition SST turbulence model was used to model the laminar-turbulent transition and its vital influence on the laminar bubble and hydrodynamic instabilities generation. The influence of turbulence on the unsteady vortex patterns was investigated. Hence, the hybrid aeroacoustic analysis with Lighthill analogy was conducted to obtain the acoustic pressure field. The approach allowed us to model hydrodynamic instabilities and the resulting VS tonal noise. The frequency of VS matched the experimental data, giving the same 1/3 octave tonal peak only for a limited freestream turbulence regime. The simplification of the present method did not allow us to model the aeroacoustic feedback loop, and resulted in lack of instabilities for higher freestream turbulence. | airfoil tonal noise, aeroacoustics, CFD | 2023 | 4 | 273 | 1-17 | 10.2478/TAR-2023-0019 | |
| Jerzy Kozak, Tomasz Zakrzewski, Marta Witt, Martyna Dębowska-Wąsak | Thermal Operating Window in Selective Laser Melting Processes | Manufacturing | Selective laser melting (SLM) is one of the most effective methods of additive manufacturing (AM). It is used to manufacture products with very complex geometries using a wide range of materials. Practical process conditions are limited by the occurrence of undesirable melting instabilities that degrade the surface quality and lead to product defects. These disadvantages are related to the thermal limitations of the SLM process. The lower thermal limit is due to the need to completely melt the powder layer and partially remelt the underlying layer again to ensure proper bonding between the layers. Exceeding the upper thermal limit in the molten metal pool may cause extensive evaporation, boiling and ejection of molten metal droplets outside the melting area. The article presents an approach and methodology that enable the determination of thermal limits and the operating window of SLM/selective laser sintering (SLS) processes in a relatively simple way. The studies have been performed using various settings of SLM process parameters. The usefulness of the preliminary determination of thermal limitations and approximate prediction of operating window of SLM has been confirmed experimentally and by more accurate computer simulation. | selective laser melting (SLM), thermal limitation, mathematical modeling, simulation | 2023 | 4 | 273 | 18-32 | 10.2478/TAR-2023-0020 | |
| Iuliia Lysenko, Yurii Kuts, Valentyn Petryk, Volodymyr Malko, Andrii Melnyk | Automated Eddy Current System for Aircraft Structure Inspection | Diagnostics | Aircraft part diagnostics are crucial during both production and maintenance, with eddy current non-destructive testing (ECNDT) being the method of choice due to its cost-effectiveness, informativeness, productivity, and reliability. ECNDT excels regardless of surface condition or coatings. It's employed for diagnosing various aircraft components, necessitating diverse transducer types, excitation modes, and advanced signal processing. To improve ECNDT, this article explores integrating harmonic and impulse excitation modes in a single tool to enhance informativeness. Building upon a wireless eddy current system, the authors propose a comprehensive method for processing and displaying information suitable for object condition monitoring systems. The system includes automated transducer mode control and experimental data processing algorithms. The constant expansion of tested objects and new materials underscores the need to enhance the theoretical foundations of eddy current non-destructive testing, refine signal processing techniques, and identify informative signs. This demands the development of new automated ECNDT tools, and this article offers a promising avenue for improvement. The results include model and experimental tests of system components, showcasing the potential of this approach to enhance ECNDT effectiveness, automation, and informativeness in the realm of aircraft part diagnostics. | aviation material inspection, eddy current, signal characteristics, information parameters, scanning | 2023 | 4 | 273 | 33-40 | 10.2478/TAR-2023-0021 | |
| Mykola Chernyak, Vadym Kolesnyk | Improving Strapdown Inertial Navigation System Performance by Self-Compensation of Inertial Sensor Errors | Avionics | Microelectromechanical systems (MEMS)-based strapdown navigation systems offer advantages such as small size, low cost and minimal power consumption. However, MEMS sensors are prone to significant low-frequency noise and poor bias repeatability, which can lead to navigational errors over time. These errors make them unsuitable for autonomous navigation applications, even with frequent recalibration. One way in which to solve this problem is by using the rotation modulation (RM) method. This approach is widely recognised but has only been successful with precise laser and fiber optic gyroscopes equipped with precise rotating platforms. This article focuses on the potential of adapting the RM method for the case of inexpensive MEMS sensors that can significantly improve navigation performance, while maintaining the benefits of microelectromechanical technologies. Potential issues of implementation were discussed, and corresponding requirements were formulated. The proposed optimal computation scheme was verified during static tests of the developed inertial measurement unit (IMU). Further steps in studying the adaptation of the RM method for MEMS sensors have also been outlined. | MEMS IMU, autonomous INS, MEMS self-compensation, rotation modulation | 2023 | 4 | 273 | 41-51 | 10.2478/TAR-2023-0022 | |
| Pamela Bugała, Janusz Sznajder, Adam Sieradzki | Numerical Modelling of Static Aeroelastic Deformations of Slender Wings in Aerodynamic Design | Aeroelasticity | The article presents the validation of two methods for analyzing the aerodynamic properties of the aircraft wing concerning aeroelastic effects. The first method is based on low-cost computational models (Euler–Bernoulli Beam Model and Vortex Lattice Method [VLM]). Its primary objective is to estimate the wing’s deformation early in the design stages and during the automatic optimization process. The second one is a method that uses solutions of unsteady Navier–Stokes equations (URANS). This method suits early design, particularly for unconventional designs or flight conditions exceeding low-fidelity method limits. The coupling of the flow and structural models was done by Radial Basis Functions implemented as a user-defined module in the ANSYS Fluent solver. The structural model has variants for linear and nonlinear wing deformations. Features enhancing applicability for real-life applications, such as the definition of deformable and nondeformable mesh zones with smooth transition between them, have been included in this method. A rectangular wing of a high-altitude long-endurance (HALE) aeroplane, built based on the NACA 0012 profile, was used to validate both methods. The resulting deflections and twists of the wing have been compared with reference data for the linear and nonlinear variants of the model. | aeroelasticity, static analysis, beam model, radial basis functions | 2023 | 4 | 273 | 52-70 | 10.2478/TAR-2023-0023 | |
| Jevgenijs Terescenko, Vladimir Shestakov and Andris Vaivads | Analysis of Failure States of Functional Systems of Aircraft Such as Boeing 737 in the Airline | Safety | The article presents the results of analysis of failures of the main functional systems units of aircraft Boeing 737 during the last 10 years of its operation in the national airline of Latvia ‘Air Baltic Corporation’. Total flight time was TΣ = 322,529 h and 184,538 cycles [1]. These data were obtained from daily reports of defects and unplanned consumption of spare parts for these systems. Failures of instrumental equipment of avionic systems were investigated in detail. Based on calculations of their failure probability and component replacement frequency, a comprehensive system including measures and their technical and instrumental support has been developed to improve maintenance productivity. Such a system requires relatively inexpensive components, is simple and can be used in the operation of this type of aircraft. | aircraft equipment, aviation technology, probability of failure, components, functional systems | 2023 | 4 | 273 | 71-78 | 10.2478/TAR-2023-0024 | |
| Jacek Pieniążek, Piotr Cieciński | Curvilinear approach to landing | The article describes the problem of controlling an aircraft control when performing a landing on a curvilinear trajectory. The adoption of a curvilinear approach trajectory allows reducing the impact of air traffic on the areas adjacent to the airport. Performing the correct approach on the curvilinear path requires support. For the correct execution of the landing manoeuvre on the curvilinear track, it is necessary to establish reference points so that the repeatability of the manoeuvre is ensured, especially in the case of landing more than one aircraft at the same time. In the following parts, the landing control system is presented. Particularly carefully presented is the issue of performing tests of the designed control system, which in the case of the aircraft control system during the approach to landing must be extremely thoroughly verified. The test plan included both verification the correctness of the adopted control laws and their robustness to interference occurring as a result of atmospheric air streams. | fixed wing aircraft, curvilinear trajectory, approach and landing, automatic control | 2024 | 1 | 274 | 1-18 | 10.2478/TAR-2024-0001 | ||
| Yevhenii Shkvar, Shiju E, Andrii Kryzhanovskyi, Dmytro Redchyts | Various blowing-suction schemes for manipulating turbulent boundary layers | The methodology of efficiency analysis of turbulent flow modification by making permeable sections in the streamlined wing surface with the aim to reduce aerodynamic drag is the principal subject of the presented research. The numerical analysis of the effect of laterally and longitudinally located permeable sections on boundary-layer properties showed the following flow features: (1) the most effective place for permeable surface is an upwind side of the wing; (2) multi-sectional blowing can simply be organised as non-uniform (especially in the case of laterally arranged permeable sections) that brings additional flexibility to change the blowing intensity depending on flight mode and, first of all, on angle of attack; and (3) arrays of longitudinal permeable sections allow to intensify turbulent vortical structures exchange in the lateral direction and improve flow stability to stall. Moreover, due to creating the regular anisotropy of the boundary layer in the lateral direction, this modified blowing technique can potentially have some synergistic properties, which can give the additional benefit. All these effects are too delicate and their experimental study cannot be performed with the use of directed measurements of aerodynamic forces. The comparison of the obtained flow properties with the corresponding experimental data demonstrates an appropriate level of agreement. | combined flow control, drag reduction, blowing, suction, numerical flow modelling, RANS, experimental data analysis. | 2024 | 1 | 274 | 19-28 | 10.2478/TAR-2024-0002 | ||
| Sintija Zetliņa, Mārtiņš Kleinhofs | Flap strut fairing system expluatation and critical path method use | The flap strut fairing system is made of movable construction inside, but the outer skin is made of composite material. Each day, we can face an expensive repair for movable construction and outer skin as most of the aviation companies are dealing with mechanical issues that are not solved during a long period of time or somebody misses it due to human errors. In this abstract, we will look for options for easier and faster solutions to avoid the expensive operation process. | composite materials, mechanical systems, cost-efficient. | 2024 | 1 | 274 | 29-44 | 10.2478/TAR-2024-0003 | ||
| Volodymyr Zinovkin, Iurii Krysan, Andrii Pyrozhok, Taras Yanko | Study of stability criteria of automatic control systems by multiparametric aviation objects | This paper considers the comparative analysis of the physical and mathematical methods of the optimal operation of aviation objects’ automatic control systems, which is an urgent scientific and technical task. The paper also represents the corresponding stability criteria, depending on the operating conditions, and the influence of external factors that allows ensuring the automatic control systems’ reliable operation not only in normal circumstances, but also in the presence of probable disagreements. The scientific novelty of the research lies in developing new stability criteria by means of synthesising the influence of different factors and also the ability to ensure optimal functioning of the automatic control systems. Corresponding mathematical and computer models have been developed. The use of these models allows to determine the optimal stability criteria for control systems with parameters of a different physical nature and ensure reliable operation of electromechanical systems for general and special applications based on the current analysis. The research results are illustrated by corresponding mathematical models, engineering calculations and modelling of the optimal control limits depending on the influence of various factors. The simulation results coincide with the theoretical calculations, which indicates the consistency between the microprocessor-based and software of automatic control systems. | control system, aviation object, optimisation, stability, mathematical model, modelling. | 2024 | 1 | 274 | 45-70 | 10.2478/TAR-2024-0004 | ||
| Natalija Mozga, Juris Gutans, Raivis Kubulins, Rafał Chatys | Calculation and design of the main equipment for mobile space simulation system | The article presents the validation of two methods for analyzing the aerodynamic properties of the aircraft wing concerning aeroelastic effects. The first method is based on low-cost computational models (Euler–Bernoulli Beam Model and Vortex Lattice Method [VLM]). Its primary objective is to estimate the wing’s deformation early in the design stages and during the automatic optimization process. The second one is a method that uses solutions of unsteady Navier–Stokes equations (URANS). This method suits early design, particularly for unconventional designs or flight conditions exceeding low-fidelity method limits. The coupling of the flow and structural models was done by Radial Basis Functions implemented as a user-defined module in the ANSYS Fluent solver. The structural model has variants for linear and nonlinear wing deformations. Features enhancing applicability for real-life applications, such as the definition of deformable and nondeformable mesh zones with smooth transition between them, have been included in this method. A rectangular wing of a high-altitude long-endurance (HALE) aeroplane, built based on the NACA 0012 profile, was used to validate both methods. The resulting deflections and twists of the wing have been compared with reference data for the linear and nonlinear variants of the model. | space technology, test systems,; test requirements, vacuum system, vacuum pumping system, calculation | 2024 | 1 | 274 | 71-89 | 10.2478/TAR-2024-0005 | ||
| Vladimirs Vorohobovs | Preliminary analysis of wind parameters at the planned construction sites of wind generators | To choose optimal place for wind turbine, you need to know two basic parameters: 1.Vaverage – the average wind throughout the year (or during the season when more electricity is needed). The total amount of kilowatt hours of electricity you will get, depends on this parameter. 2.Vmax – the maximum possible dangerous gust of wind during a storm. The required strength depends on this parameter and hence the cost of construction. In order to evaluate the place itself, it is possible to combine these two parameters to only one physical parameter: VBojat – the average wind speed which is devaluated by hurricanes. In this article, it is called: “Bojatspeed”. Measurements for Vaverage must be done for at least a year, but for Vmax for at least ten years. They are obligatory before any decision about construction of wind turbine. And not generally in the country, but exactly in the particular place. A system of two devices for such measurements is described in this article: anemometer and brazmometer. Both are made in Latvia. They are purely mechanical and include no electronics - that is why they do not require battery or any service during many years. | return on investment, wind energy conversion, wind profile, anemometer, brazmometer. | 2024 | 1 | 274 | 90-105 | 10.2478/TAR-2024-0006 | ||
| Iuliia Lysenko, Yurii Kuts, Valentyn Uchanin, Yordan Mirchev, Oleksandr Levchenko | Evaluation of eddy current array performance in detecting aircraft component defects | Eddy current array (ECA) technology is increasingly being used in the aerospace industry for non-destructive testing of aircraft components. This study evaluates the performance of ECA in detecting defects in aircraft components, focusing on its effectiveness, reliability, and sensitivity. The study evaluates the effectiveness of ECA technology in eddy current defectoscopy by introducing a dimensionless efficiency coefficient, then seeks to validate this coefficient through experimental testing of aircraft component materials with artificially induced defects of various sizes, types, and orientations to simulate real-world scenarios. ECA’s sensitivity in detecting small and subsurface defects is analyzed, along with precise defect sizing and positional information. Reliability and repeatability are investigated through repeated measurements. Furthermore, the article analyses the impact of various factors on the performance of ECA, including surface conditions, probe configurations, and inspection parameters. Comparative analysis is performed to assess the advantages and limitations of ECA in comparison to other conventional inspection methods. The findings of this study will contribute to a better understanding of the capabilities and limitations of ECA in detecting aircraft component defects. The results will aid in optimizing inspection strategies, enhancing the reliability of defect detection, and improving the overall maintenance practices in the aerospace industry. | eddy current, signal characteristics, information parameters, defect detection, performance evaluation | 2024 | 2 | 275 | 1-9 | 10.2478/TAR-2024-0007 | ||
| Anvar Zabirov, Vladimirs Shestakov, Zarif Zabirov | Analysis of approaches to assessing flight delays due to technical issues at airline network airports within the operational management framework | This paper analyzes approaches to developing models for the technical exploitation (TE) of aircraft within operational management framework. The operational management contour of the TE of the airline’s AC fleet is considered as a TE process consisting of a sequence of flight routes, which, in turn, comprise a sequence of flights between airports in the airline network during the calendar interval when the aircraft are in this contour. We present a model that evaluates the capacity for aircraft recovery at the network airports of a hypothetical airline (dubbed “RAF”) if the need so arises, utilizing the probabilistic and temporal characteristics of the airports used for aircraft recovery. | aircraft, technical exploitation, operational management. | 2024 | 2 | 275 | 10-19 | 10.2478/TAR-2024-0008 | ||
| Valentyn Uchanin | Detecting and estimating local corrosion damages in long-service aircraft structures by the eddy current method with double-differential probes | Monitoring corrosion in aircraft structures through nondestructive testing is crucial for maintaining long-term aircraft serviceability. Corrosion monitoring is particularly challenging when corrosion damage is situated on internal surfaces of multilayer aircraft structures. The eddy current method is one of the most promising techniques for detecting and measuring such subsurface corrosion damage without direct contact or disassembly. However, due to their low sensitivity traditional eddy current probes with coaxial coils are not well suited for detecting corrosion damages of the local type, such as pitting or corrosion pits, in multilayer aircraft structures. This study tested the use of low-frequency eddy current probes of the double-differential type, characterized by 8 and 10 mm operational diameters, in detecting and measuring hidden corrosion damages of this local type. Such corrosion damages were simulated by means of flat-bottomed drilled holes of differing diameters and depths (or different diameters and residual thicknesses of the inspected sheet in the damaged area). The signals from the eddy current probes were evaluated in the complex plane using a universal eddy current flaw detector. The correlations between the amplitude and phase of the eddy current signal and depth of location of the local corrosion damages were analyzed. Results indicate that it is possible to estimate the residual thickness of the skin in locally corroded areas by measuring the eddy current signal phase, independently of the local corrosion damage diameter (size), providing useful information for residual service life determination. | multilayer aircraft structure, corrosion damage, pitting, corrosion pit, eddy current method | 2024 | 2 | 275 | 20-32 | 10.2478/TAR-2024-0009 | ||
| Artem Shulhin, Yevhenii Chemerys, Vasyl Loginov, Volodymyr Kharchenko, Ihor Tulenko | Numerical simulation of workflow for evaluating flame tube thermocyclic durability | This paper considers the comparative analysis of the physical and mathematical methods of the optimal operation of aviation objects’ automatic control systems, which is an urgent scientific and technical task. The paper also represents the corresponding stability criteria, depending on the operating conditions, and the influence of external factors that allows ensuring the automatic control systems’ reliable operation not only in normal circumstances, but also in the presence of probable disagreements. The scientific novelty of the research lies in developing new stability criteria by means of synthesising the influence of different factors and also the ability to ensure optimal functioning of the automatic control systems. Corresponding mathematical and computer models have been developed. The use of these models allows to determine the optimal stability criteria for control systems with parameters of a different physical nature and ensure reliable operation of electromechanical systems for general and special applications based on the current analysis. The research results are illustrated by corresponding mathematical models, engineering calculations and modelling of the optimal control limits depending on the influence of various factors. The simulation results coincide with the theoretical calculations, which indicates the consistency between the microprocessor-based and software of automatic control systems. | turbofan engine, time between overhaul, numerical simulation, flame tube, workflow, thermal and stress- strain state, thermocyclic durability | 2024 | 2 | 275 | 33-43 | 10.2478/TAR-2024-0010 | ||
| Narayanan Srinivasan, S. R. Balasundaram | Enhancing command recognition in air traffic control through advanced classification techniques | This paper addresses the persistent challenges in speech processing within the Air Traffic Control (ATC) domain, a field where despite extensive research, issues such as handling noisy environments, accented speech, and the need for strict adherence to standard phraseology continue to undermine conventional language models. Our study employs a hybrid approach that integrates syntactic analysis with advanced machine learning classification algorithms – Logistic Regression, Lagrangian Support Vector Machine, and Naïve Bayes. By mixing and matching algorithms tailored for specific aspects of speech processing, our approach moves away from traditional reliance on a singular integrated system, illustrating through rigorous testing with the ATCOSIM dataset that such a multifaceted strategy markedly improves command recognition accuracy and adapts more effectively to the unique linguistic features of ATC speech. Results highlight the superior performance of Logistic Regression across various command recognition categories, pointing towards a promising direction for future advancements in ATC speech recognition technologies aimed at reducing human workload and increasing automation precision. This paper explores the complexities of the required analysis techniques and underscores the necessity of employing diverse algorithms in the processing pipeline to enhance overall system accuracy. | Air Traffic Speech, air traffic speech classification, Error Detection and Correction, air traffic command recognition | 2024 | 2 | 275 | 44-65 | 10.2478/TAR-2024-0011 | ||
| Janusz Sznajder | Low simulation-based methodology for reducing the risk of fuel fire in an aircraft`s fuel system enclosure | This study applies advanced computational fluid dynamics (CFD) simulations to enhance the safety of an aircraft’s fuel system by striving to minimize the risk of on-board fire hazards. Employing a detailed flow simulation model, this research assesses the efficacy of newly designed measures within a fuel system, designed for a modified radial engine on a test-bed AN 2 airplane. The model simulates internal airflow, droplet particle flow, the formation of Eulerian Wall Film, and the vaporization process from the fuel film within the enclosure of the aircraft’s equipment bay. By exploring both the original and modified geometries of this fuel system enclosure, the simulations provide insights into the flowpaths of leaking fuel, the spatial and temporal distribution of fuel vapor concentrations, and the overall effectiveness of design modifications aimed at rapid removal of hazardous substances. Structural improvements, including the addition of strategic ventilation inlets and outlets, are proposed based on the simulation results to ensure rapid dispersion of vapors and minimal residual fuel, effectively reducing the potential for vapor ignition. This study thus underscores the potential of precise CFD modelling in identifying risks and developing robust fire hazard mitigation strategies in aviation fuel systems. | flow simulation, phase change, Eulerian wall film | 2024 | 2 | 275 | 66-92 | 10.2478/TAR-2024-0012 |