Autor: P., P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Liquid lubricants for space engineering and methods for their testing
Autorzy:: Kałdoński, T.
Wojdyna, P. P.
Powiązania:: https://bibliotekanauki.pl/articles/244614.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: tribology
lubrication
space engineering
test methods
liquid lubricants
Opis:: This paper presents the analysis of the world source letters [1-60] about liquid lubricants for lubrication of the tribological nodes in space engineering for instance: mineral oils, synthetic hydrocarbons, silicones, perfluoropolyethers (PEPEs), ionic liquids, silicic hydrocarbons. Requirements for liquid lubricants in space applications and research methods for their testing are characterized, among others: four-ball vacuum apparatus and pin-on-disk friction tester for tests in vacuum. The development trends of liquid lubricants for space applications are described, too, e.g. direction of development of lubricant substances, development of lubricating substances research and lubrication technologies for space engineering in the future (lubrication systems in inert atmosphere, mist lubrication, lubrication with fine grade powder, deposition of liquid lubricant vapours, gas bearings, magnetic bearings. The existing research methods are imperfect. Till now it is impossible to simulate many factors occurring in space (eg. State of weightlessness, the atmosphere containing the atom oxygen). It is hard to determine precisely (predict) the tribological node wear. There fore the research works on improvement of the existing test stations and analytical, methods and creation of new methods of tests and analysis are necessary.
Źródło:: Journal of KONES; 2011, 18, 1; 163-184
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Span length influence on dynamic response of selected bridge under high - speed train
Autorzy:: Szurgott, P.
Bernacki, P.
Powiązania:: https://bibliotekanauki.pl/articles/247827.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: railway bridge
composite bridge
ballasted track
high-speed train
modelling and simulation
Opis:: The paper presents a methodology of finite element (FE) modelling and simulation of the bridge – track – moving high-speed train system using CAE systems. Two composite (reinforce-concrete – steel) bridges were considered. The span length was equal to 15 and 21 meters, respectively. Bridges selected for the study belong to the proposed series of bridges with the span length of 15 to 27 meters stepped by 3 meters. Full symmetry of the bridges was assumed. RC platform was homogenized since the rebars were distributed quasi-uniformly in the specified platform sections. The FE model of a bridge superstructure consisted of 4-node shell elements (main beams) and 8-node 48 DOF solid elements (reinforced concrete platform). RAIL_TRACK and RAIL_TRAIN LS-DYNA’s modules were applied for simulating the moving train – track interaction. Ballasted track with the rectilinear rail-line axis was taken into consideration. German ICE-3 train running at velocity of 200–300 km/h was selected as a representative for the study. All mass components of the train FE model were treated as rigid bodies. Symmetric vibrations of the train units were assumed with respect to the main longitudinal vertical plane of symmetry of the system. Nodal displacement and longitudinal normal stress in shell elements were registered during the FE analysis. The results were depicted in the form of time histories for selected velocities. In addition, extreme values of vertical deflections and normal stress were compiled and presented a function of train velocity. It allowed to assess the dynamic response of the bridge depending on its span length. Contours of resultant displacement for the RC platform was also presented.
Źródło:: Journal of KONES; 2013, 20, 1; 343-350
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Polymers foam structure numerical identification
Autorzy:: Rumianek, P.
Żach, P
Powiązania:: https://bibliotekanauki.pl/articles/248077.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: elastomers
polymers foam
oscillation
very large reversible deformation
Opis:: Polymers found regard among engineers and researcher their special proprieties. Now, we find using the polymers at present in the most advanced technically the branches of industry. In construction of machines, more and more often are practical used hyperdeform materials. The group of construction materials, called hyperdeformable, includes among others: elastomers, plastics made based on rubber, thermoplastic structures, such as polycarbonate, gels and sols, composites and foams: open and closed pores. Porous structures are produced on the basis of different materials, synthetic thermoplastic polymers and thermosetting. The problem of porous materials is taken in many research centres in the world. Porous materials (also called cellular plastics, foam plastics or foamed plastics) include gas phase dispersed in a solid phase of polymeric material. Properties of such systems depend on the properties of the polymer warp and cell structure comprising the gas phase. Approach previously used to anticipate and interpret the behaviour of the hyperdeformable structures, using the theory of hyperelastic materials, does not resolve the issue because it only describes the elastic properties. The article presents an original methodology developed structural identification the viscoelastic properties of hyperdeformable materials, and in particular modern construction materials from the group of plastics and composites of elastomers, foams, etc
Źródło:: Journal of KONES; 2014, 21, 3; 259-263
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The influence of dynamic soil parameters on tractive performance of off-road undercarriages
Autorzy:: Dudziński, P.
Stefanow, P.
Powiązania:: https://bibliotekanauki.pl/articles/245803.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: tracked undercarriage
terramechanics
soil dynamics
off-road vehicles
Opis:: Design of optimal machines and off-road vehicles requires, among others the knowledge of dynamic interaction of the traction components with soil. Due to the lack of constitutive equation of soil, in practice the research centres worldwide use the so-called process analogues, i.e. the special test devices. These devices however are used only for static tests and are burdened with the scale error. They are also often subject to the so-called wall effect and bulldozing effect. The research conducted in The Department of Off-Road Machine and Vehicle Engineering has shown that in the dynamic interaction of traction components or working tools with soil a substantial strengthening of cohesive soils, which can cause even several times increase in their strength, which significantly changes the commonly used relationships based on static tests. In the article, the unique on the international scale test equipment developed in the Department of Off-Road Machine and Vehicle Engineering for experimental identification of dynamic soil strength parameters is shown. In addition, the initial results of the tests obtained with this device in the laboratory and in situ are presented. The practical impact of dynamic strengthening of soil are presented as opposite to the conventional methods, at the example of traction forces generated by the tracked undercarriage estimated by virtue of an undercarriage analytical model.
Źródło:: Journal of KONES; 2016, 23, 3; 115-120
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical analysis of collision between locomotive and passenger car located on level crossing
Autorzy:: Szurgott, P.
Dziewulski, P.
Powiązania:: https://bibliotekanauki.pl/articles/246815.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite element method
dynamic analysis
collision
railway vehicle
passenger car
LS-DYNA
Opis:: The main aim of this study is to carry out dynamic finite element analysis of a collision between shunting locomotive and a passenger car. Numerical simulations include side impact of the running locomotive in the vehicle situated across the track on a level crossing. A considered locomotive based on a popular diesel-electric shunting locomotive SM42 but it was slightly modernized in comparison with the original. Finite element model of the locomotive was developed by the authors whereas the vehicle FE model was download from the National Crashworthiness Analysis Center database and it was dedicated to the crash/impact analyses. FE analysis was carried out according to the PN-EN 15227 standard which provides crashworthiness requirements for railway vehicle bodies. However, additional objective of the analysis was to evaluate the behaviour of a small passenger car during the side impact with about 70-ton locomotive. A subcompact passenger car – Geo Metro – was selected as a representative for the study. One of the design collision scenario impact into low obstacle for railway vehicles operated on national and regional networks. LS-DYNA computer code was used for the simulations. The paper presents selected results of analysis generally focused on the locomotive frame behaviour. Contour of stress for the moment of time is presented. Moreover, time histories of selected parameters are depicted. The energy balance was also checked in order to confirm the accuracy of analysis.
Źródło:: Journal of KONES; 2014, 21, 4; 489-496
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Development of finite element model of shunting locomotive applicable for dynamic analyses
Autorzy:: Dziewulski, P.
Szurgott, P.
Powiązania:: https://bibliotekanauki.pl/articles/247466.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite element method
modelling
dynamic analysis
crash test
railway vehicle
LS-DYNA
HyperMesh
Opis:: The main aim of this study is to develop a finite element model of the hybrid-shunting locomotive. Considered locomotive is based on a popular shunting locomotive in Poland – SM42. All components above the locomotive frame could be modified in comparison to the original object, whereas a chassis was essentially unchanged. Such solution allows the operators freely configure components e.g. diesel engine, generator, cooling module, cab etc., according to their own requirements. Works on the FE model were focused on very accurate reflection of the locomotive frame since the planned dynamic analyses include crash tests. FE model of the frame has a fine mesh and it is considered as a deformable component. Other segments of the vehicle are simplified and treated as rigid bodies mostly. FE model was developed on the basis of the locomotive CAD model. It was decided to transform the CAD model of the frame into the FE one applying the midsurface procedure. Such approach is correct since the locomotive frame is made of a large number of steel elements in the form of sheet metal plates and sections welded together. Altair Hyper Mesh software was used in the FE model developing process. Appropriate connections between respective components of the model e.g. wheelset – bogie, bogie – locomotive frame, were applied. Finally, the locomotive FE model consists of about 116 thousands of finite shell and solid elements and about 125 thousands of nodes. Dynamic analyses of the locomotive FE model will be carried out using LS-DYNA computer code.
Źródło:: Journal of KONES; 2014, 21, 4; 95-102
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Influence of dynamic load on military vehicles construction
Wpływ obciążeń dynamicznych na budowę pojazdów wojskowych
Autorzy:: Simiński, P.
Stryjek, P.
Powiązania:: https://bibliotekanauki.pl/articles/241969.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: obciążania dynamiczne
obciążania udarowe
badania eksperymentalne
pojazd
dynamic load
impact load
experimental researches
vehicle
Opis:: W artykule przedstawiono wpływ obciążeń udarowych i dynamicznych na konstrukcje pojazdów. Autorzy skoncentrowali się w głównej mierze na pojazdach terenowych i wojskowych, ponieważ warunki w jakich są eksploatowane powodują, że są one najczęściej narażone na obciążenia udarowe. W artykule pokazano przykłady wpływu obciążeń dynamicznych pochodzących od nierówności drogi na konstrukcje pojazdu. Ponadto zwrócono również uwagę na inne możliwe źródła obciążeń dynamicznych występujące w procesie eksploatacji. Przedstawiono także praktyczne uszkodzenia, które powstały na skutek wspomnianych obciążeń od innych źródeł. Uszkodzenia te wynikają zarówno z przekroczenia doraźnej wytrzymałości konstrukcji, jak i często z przyjęcia przez konstruktorów, już na etapie projektowania, błędnych rozwiązań. W kolejnej części zwrócono uwagę na rozwiązania konstrukcyjne oraz sposoby zapobiegania uszkodzeniom, mające na celu zabezpieczyć konstrukcje pojazdu i pasażerów, przed negatywnym skutkiem obciążeń udarowych. Niniejszy artykuł ma na celu przekazanie praktycznych uwag na temat wpływu obciążeń dynamicznych na konstrukcje pojazdów. Wszystkie z przykładów wpływu obciążeń dynamicznych na konstrukcje pojazdów, przedstawionych w artykule, pochodzą z praktyki badawczej i często dotyczą one pojazdów specjalnych lub konstrukcji prototypowych. Pojazdy wojskowe powinny być zabezpieczone przed wszelkiego rodzaju obciążeniami udarowymi, które mogą wystąpić podczas eksploatacji, a w wypadku przekroczenia wytrzymałości poszczególnych elementów, pojazd powinien być możliwy do naprawienia siłami wojskowych jednostek remontowych, nawet w warunkach poligonowych.
The article presents influence of dynamic load on construction military vehicles. The authors concentrated their attention on off road and military vehicles, because they operated in hard condition and are endanger to load impact. The article presents examples of influence the dynamic load on bump's road. Additionally, authors take note of another sources dynamics load during operation. Showed also practise damages as a result of dynamics load from different sources. These damages are result from over durability and engineer mistakes in construction procedure. In next part of articles the authors take note of construction solutions and ways prevent to damages. These solutions have been protecting crew to negative result of dynamics load and impact load. The article additionally takes note of practise experience from vehicle operation. All examples to coming from testing practise and often concern to prototypes and special vehicles. Military vehicles should be safe against all manner of impact loads which can appear during working, and in the case of excess strength particular elements, the vehicle should be retrievable the vehicle should be been by retrievable by military repair troops, even in range conditions.
Źródło:: Journal of KONES; 2007, 14, 1; 343-348
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Aviation piston engines : flight parameter analysis
Autorzy:: Boguszewicz, P.
Glowacki, P.
Powiązania:: https://bibliotekanauki.pl/articles/245160.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: aviation piston engine
on-condition maintenance
engine flight parameter
Opis:: A program and tools enabling general aviation operators in our country the exploitation of the piston engines oncondition has been developed in the Institute of Aviation. Apart from the existing and strictly supervised engine manuals tasks, the program introduces, among other things, new maintenance mandatory activities like engine parameter monitoring during cruise and climb and a way of assignation diagnostic tolerance limits for them. That has never been performed in the aviation piston engines maintenance practice. In order to improve such analysis a flight data recorder (FDR) EDM 900 has been installed on the DA20- C1 „Katana” aircraft equipped with IO-240-B engine, which will allow elimination of the pilot's read errors and examination of the changes in the parameters during the entire flight. This will enable estimating if at a certain time of the flight a specified engine parameter is not exceeding the permissible values. Parameters from cruise have to be recorded in the similar range of the engine rpm’s. The parameters are oil pressure, oil temperature, cylinder head temperature, EGT, fuel flow, outside air temperature, rpm and altitude. Lower and upper acceptable limit values should be set, in which they can be contained throughout engine life. Engineers should also observe the trend of their changes. This article shows results of the aviation piston engine parameters analysis taken from FDR for ground runs, take-offs and cruise flight phases.
Źródło:: Journal of KONES; 2016, 23, 3; 41-48
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Modelling research of the characteristics of gasturbine axial compressor with changeable flow passage geometry
Autorzy:: Wirkowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/246179.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: gas turbine
axial compressor
variable stator vanes
Opis:: In real exploitational conditions marine gasturbine engine works at different rotation speeds determined by the required parameters of ship's movement. Conversion from one rotation speed to another is related to realization of unsteady energetic processes, determined by the gasodynamic mutual influence of compressor configurations. The values of working medium flow thermodynamic parameters undergo significant changes in time. To work out the qualitative and quantitative estimation of these changes it is necessary to define the dynamic equations, describing working medium flow through the gas passage of engine. In the next step it is necessary to resolve the defined equations for disturbances of steady cooperation of compressor configurations. This paper concerns the application of mathematical modelling methods to analyzing gas-dynamic processes in marine gas turbines. The influence of geometry changes in axial compressor flow passage on kinematical air flow characteristics is presented. The elaborated mathematical model will make it possible to realize - in the future -simulative investigations of gas-dynamic processes taking place in a compressor fitted with controllable guide vanes. Individual parametric features of every engine in service are identified by using expensive experimental tests, which are conditioned by many constructional and operational limitations. The dynamic development of computer technology, enables using it for numerical simulation of changeable technical state processes.
Źródło:: Journal of KONES; 2011, 18, 3; 507-514
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Hyperelastic polynomial models in plastics behaviour analyses
Autorzy:: Żach, P
Powiązania:: https://bibliotekanauki.pl/articles/246289.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: incompressible materials
elastomers
oscillation
very large reversible deformations
vibration
Opis:: The issue of vibration damping occurs in many mechanical problems in the operation of various devices, in the automotive industry engineering, aerospace. In the case where damping by selection of the masses and dimensions is not possible due to various reasons or for other reasons it was abandoned, vibration dampers are used. Minimization of adverse impact of dynamic interaction effects is an important research and technical problem. Passive energy absorbers used today (complex of bumpers, passenger lifts buffers typically allows to the safe dissipation of energy within a certain range of loads. In the case of high-impact loading variability is desirable to use an adaptive energy absorption system capable of rapid change their dynamic characteristics. The main issue in the analysis of interactions impact of dynamic loads on objects is dispersion (dissipation) of kinetic energy during impact. In constructions of polymer composite structures the sources of energy dissipation are: matrix of polystructural viscoelasticity, morphology of material, defect of structure, thermoplastic and viscoplastic dumping. In construction of machines more and more often be practical used materials name hyper-elastic. To description of elastic proprieties it’s possible to use the worked out theories well in which the most important they are the multinomial models and them special coincidence: Mooney’s – Rivlin’s, Yeoh’s. In this paper, is presented numerical behaviour analyses materials with large deformation.
Źródło:: Journal of KONES; 2013, 20, 1; 381-386
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Analysis of electric - drive applicability in mechanical brake for the commuter class airplane
Autorzy:: Grygorcewicz, P.
Powiązania:: https://bibliotekanauki.pl/articles/246340.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
airplanes
brakes
landing gear
construction process
Opis:: This article presents selected issues related to the design methodology of the electric brakes during the construction process as well as other factors which are important in the design process. It is a very important issue due to affect on the airplane and automotive brake design. Nowadays when new solution of brakes is being designed there is a need to take into account various factors influencing the design such as: weight, compatibility and flexibility of use in various aircraft, reliability and durability, ease of installation and maintenance, low-cost operation and low cost components, braking efficiency, short braking distance. All of these factors are taken into account when designing a prototype of the electric brake as well as economical factor of the design. It is also necessary to verify the design during its creation using experimental and laboratory test data from other similar designs. The aim of the paper is to discuss design process from the very beginning (i.e. by comparing features of the electric brakes with other types of brakes in order to show advantages and disadvantages of chosen solution) to the creation of a working demonstrator in future. Author of the paper in his electric brake design bases on the experience of the Warsaw’s Institute of Aviation Landing Gear Department.
Źródło:: Journal of KONES; 2013, 20, 2; 143-148
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Tracked or wheeled chassis
Podwozie gąsienicowe czy kołowe
Autorzy:: Rybak, P.
Powiązania:: https://bibliotekanauki.pl/articles/246376.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: tracked chassis
wheeled chassis
running wheels
tracks
mobility
Opis:: One of the basic characteristic that characterize combat vehicles or transportation special vehicles, regardless of type of vehicle, is ability to move along any kind of roads as well as overcome different kind of off road obstacles natural and artificial. These vehicles on their road can encounter rigid pavement, flexible or plastic pavement, that could have high or low road adhesion, wet or dry, covered by fluffy or wet snow, ice, stones, rubble or else other objects. Natural terrain configuration is characterized by different undulating extent, hills, steep slopes, ditches and gorges, water-courses and rivers. Combat vehicles, with tracked or wheeled chassis, while tasks realization any minute now can encounter such environment, they have to overcome it and achieve the destination. Endless consideration and disputes to the point, which of combat vehicles: with tracked chassis or wheeled chassis can better realize the tasks in of road condition, are carrying on for many years and the end is unknown. There are presented various views concerning that issue including military vehicles producers as well as their users. Both sides are right because it is very difficult to choose optimal solution it is chosen compromise solution. In the paper were presented results of analysis of some factors that have essential influence on tracked and wheeled chassis traction characteristics on bearing on using them in future combat vehicles and transportation special vehicles.
Jedną z podstawowych właściwości charakteryzujących pojazdy bojowe lub specjalne transportowe, niezależnie od rodzaju podwozia, jest ich zdolność do poruszania się po dowolnych drogach oraz pokonywania różnego rodzaju przeszkód terenowych naturalnych i sztucznych. Pojazdy te na swojej drodze mogą napotkać nawierzchnie twarde, elastyczne lub plastyczne, które mogą być o dużej lub o małej przyczepności, mokre lub suche, pokryte puszystym śniegiem, lodem lub mokrym śniegiem, pokryte kamieniami, gruzem lub innymi przeszkodami. Naturalne ukształtowanie terenu charakteryzuje się różnym stopniem pofałdowania, wzniesieniami, stromymi skarpami, rowami i jarami, ciekami wodnymi i rzekami. Pojazdy bojowe, z podwoziem gąsienicowym lub kołowym, podczas realizacji zadania w każdej chwili mogą trafić na takie środowisko, muszą je w szybkim tempie pokonać i osiągnąć cel. Rozważania i spory na temat, które z pojazdów bojowych: czy z podwoziem gąsienicowym czy też z kołowym lepiej mogą poradzić sobie z realizacją zadań w terenie, toczą się od wielu lat a ich końca nie widać. Prezentowane są różne poglądy na ten problem w tym przez producentów pojazdów wojskowych jak i ich użytkowników. Racje są po jednej i po drugiej stronie i ponieważ trudno jest wybrać rozwiązanie optymalne, wybiera się rozwiązania kompromisowe. W pracy przedstawiono rezultaty analizy niektórych czynników mających istotny wpływ na właściwości trakcyjne podwozi gąsienicowych i kołowych w aspekcie zastosowania ich do przyszłych pojazdów bojowych i specjalnych transportowych.
Źródło:: Journal of KONES; 2007, 14, 3; 527-536
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Green rocket propulsion research and development at the institute of aviation : problems and perspectives
Autorzy:: Surmacz, P.
Powiązania:: https://bibliotekanauki.pl/articles/246498.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: propulsion
rocket engine
experimental research
green propellant
hydrogen peroxide
Opis:: The paper presents the main activities of the Institute of Aviation (IoA) in the field of chemical rocket propulsion. The relatively "fresh" research and development team performed many useful works within the last 5 years, starting from the strategy and ideas. Nowadays, the Space Technology Department of IoA acts as a member of international consortia realizing space projects, as well as itself working on its own assignments financed by the European Space Agency (ESA) and IoA funds. The important development aspect of rocket propulsion developed at IoA is the use of "green" propellants. These are chemicals, which are relatively safe for the environment and personnel, being a very promising alternative for storable toxic substances, e.g. hydrazine and derivatives, nitrogen tetroxide. R&D activities of STD are based on the use of Rocket Grade Hydrogen Peroxide (RGHP), also known as High Test Peroxide (HTP). This high-performance mono-propellant and oxidizer is regarded by European entities as one of the most promising candidates to replace hydrazine and its derivatives in the future. Due to numerous advantages, hydrogen peroxide is better suited for systems with human interaction that most of other propellant combinations. The paper contains selected results of research on green rocket propulsion performed at IoA, in which 98% hydrogen peroxide was used as oxidizer and monopropellant. Three types of rocket engines: monopropellant, liquid bipropellant and hybrid have been investigated and are still being developed.
Źródło:: Journal of KONES; 2016, 23, 1; 337-344
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: The hyperdeform materials in systems of vibrations machines
Autorzy:: Żach, P.
Powiązania:: https://bibliotekanauki.pl/articles/246701.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: incompressible materials
elastomers
oscillation
very large reversible deformations
vibration
Opis:: In construction of machines more and more often be practical used materials name hyper-elastic for example: foamy structures, materials of base natural and synthetic rubbers and another of large reversible deformations. To description of elastic proprieties, it is possible to use the worked out theories well in which the most important they are the multinomial models and them special coincidence: Mooney-Rivlin, Yeoh and Ogden. Precise description propriety in questions dissipation the energy, dumping of vibration is a fault currently. The aim of the article is the analysis oscillation in systems from elements of incompressible and the description of phenomena setting during of work of such like systems. In this paper, is presented built methodology of elasticity propriety materials with large deformation. An assumption is a dissipation function we have present in analogous figure to elasticity function, well known with theory of hyperelastic materials. A description of model of internal damping was proposed with the proof the influence of component part of polynomial: figure and volumetric. The numeric permissive on comparison of received conception of description of hyperelastic material worked out in support about theoretical foundations with results of experimental investigations analyses' be become executed.
Źródło:: Journal of KONES; 2012, 19, 2; 587-590
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Aerodynamic interference between pusher propeller slipstream and an airframe : literature review
Autorzy:: Ruchała, P.
Powiązania:: https://bibliotekanauki.pl/articles/246710.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: air transport
air propulsion
pusher propeller
Opis:: In the article, an aerodynamic interference between pusher propeller slipstream and the airframe of the aircraft powered by it has been presented, based on a literature study. A pusher propeller is one of popular types of the airplane propulsion. It is applied mainly in light sport aircrafts, in the UAVs (Unmanned Aerial Vehicles), unorthodox vehicles, like compound helicopters, canard and joined wing aircrafts etc. The main advantage of pusher propeller is that the engine with the pusher propeller does not affect the visibility from the cockpit and allows placing an electronic equipment in the front part of the UAV’s fuselage. Furthermore, reduced cabin noise and increase in stability due to acting normal force aft of the centre of gravity are other benefits of this configuration. The pusher propeller impact on the airframe, especially on the wing, is qualitatively different from the tractor configuration. Main differences between both propulsions has been discussed, as well as aerodynamic benefits of the pusher propeller – like reduction of separated flow area and extending area of laminar boundary layer. However, an application of pusher propeller may have also negative impact, especially lower performance than tractor propeller. In the article the reasons of this suppression has been briefly discussed.
Źródło:: Journal of KONES; 2017, 24, 3; 237-244
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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