Temat: plane - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Pressure and capacity force in slide journal plane bearing lubricated oil with micropolar structure
Autorzy:: Krasowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/950089.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: micropolar lubrication
journal plane bearing
hydrodynamic pressure
Opis:: Present paper shows the results of numerical solution Reynolds equation for laminar, steady oil flow in slide plane bearing gap. Lubrication oil is fluid with micropolar structure. Properties of oil lubrication as of liquid with micropolar structure in comparison with Newtonian liquid, characterized are in respect of dynamic viscosity additionally dynamic couple viscosity and three dynamic rotation viscosity. Under regard of build structural element of liquid characterized is additionally microinertia coefficient. In modelling properties and structures of micropolar liquid one introduced dimensionless parameter with in terminal chance conversion micropolar liquid to Newtonian liquid. The results shown on diagrams of hydrodynamic pressure in dimensionless form in dependence on coupling number N and characteristic dimensionless length of micropolar fluid A1. Presented calculations are limited to isothermal models of bearing with inflnite breadth. Especially, geometry schema of the slide Journal plane bearing gap, the dimensionless pressure distributions p1 in dependence on coupling number N2, the dimensionless pressure distributions p1 in dependence on characteristic dimensionless length of micropolar fluid, the dimensionless maximal pressure p1m in dependence on coupling number N, gap convergence coefficient are presented in the paper.
Źródło:: Journal of KONES; 2009, 16, 2; 247-253
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Statistical analysis of experimental results in the in-plane shear test for a cross-ply vinylester-carbon laminate
Autorzy:: Bondyra, A.
Gotowicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/245928.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: cross-ply laminate
vinylester-carbon laminate
in-plane shear modulus
in-plane shear strength
experimental studies
statistical analysis
Opis:: The study presents experimental studies on a regular cross-ply laminate of a [(0/90) F]4S configuration. Each layer is made of VE 11-M vinylester resin (the manufacturer: "Organika-Sarzyna" Chemical Plants) reinforced with aplain carbon fabric (the manufacturer: C. Cramer GmbH & Co. KG Division E CC). The carbon fabric has the following parameters: Styles 430, filament Carbon 6K, substance 300 g/m , warp and weft 400/400 tex, 3.7/3.7 band/cm. Laminate was produced by ROMA private enterprise using the vacuum molding technology and technological parameters developed by ROMA taking into account the VE l J-M material specification. A program of the experimental studies was aimed on statistical analysis of measurement results of the in-plane shear modulus and the in-plane shear strength of the laminate. In investigations, the in-plane shear test was carried out in accordance to the PN-EN ISO 14129:1997 standard [1], but applying the modified procedure that takes into consideration the results of the previous research on the influence of a traverse velocity and of a number of stress cycles on static measurements of the in-plane shear modulus [2]. The mean value, the standard deviation and the two-sided 95 percent confidence interval for the mean value for the investigated quantities have been determined. Practical usefulness ofthe manufacture technology of the laminate was assessed.
Źródło:: Journal of KONES; 2010, 17, 1; 41-49
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Preliminary determination of the JET-2 unmanned aerial vehicle dynamic performances
Autorzy:: Kowaleczko, G.
Powiązania:: https://bibliotekanauki.pl/articles/247554.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: unmanned aerial vehicle
JET-2 plane
aerodynamic characteristics
dynamic performances
Opis:: The paper presents result of theoretical analysis of the spatial dynamic performances for an unmanned aerial vehicle (UAV). This drone is designed and produced by consortium consisted of The Air Force Institute of Technology, The Military University of Technology, The Warsaw University of Technology and The MSP enterprise. A plane JET-2 is the jet-powered airplane dedicated for Polish Military Forces. It will be used in the training process of anti-aircraft crews. Because of high level of requirements (maximum speed, stall speed, climb rate, range and endurance), it has been designed as the jet-powered aircraft. This plane will perform autonomous flights and therefore it should be stable in all phases of flight – static and dynamic stability is desirable. Therefore, the theoretical analysis focused on the stability performances have been performed, parallel to laboratory tests. They were done using nonlinear mathematical model of the JET-2. This model will be described in the paper as well as selected results of numerical simulations. The UAV JET-1 parameters and main parts of the system with the performances as the take-off mass 80 kg, the maximum speed 150 m/s, the endurance 60 min, the altitude 5000 m are presented in the paper.
Źródło:: Journal of KONES; 2014, 21, 4; 256-262
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Pressure in slide journal plane bearing by laminar unsteady oil flow
Autorzy:: Krasowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/247887.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: journal plane bearing
lubrication
unsteady laminar oil flow
pressure distribution
Opis:: This paper shows results of numerical solutions a modified Reynolds equation for laminar unsteady oil flow in slide journal plane bearing gap. It shows a preliminary analysis of pressure distribution change in the bearing by laminar, unsteady lubrication caused by velocity perturbations of oil flow in the longitudinal direction of a bearing. Described effect can be used as an example of modelling the bearing friction node operations in reciprocating movement during exploitation of engines and machines. Plane crossbar journal bearing occur in ship combustion engine as a crosshead bearing. During modelling crossbar bearing operations in combustion engines, bearing movement perturbations from engine vertical vibrations causes velocity flow perturbations of lubricating oil on the bearing race and on the bearing slider in the longitudinal direction. Engine forced vertical vibrations frequency and crankshaft forced torsional vibrations is determined by shaft rotational speed, engine cylinder number and by engine type. This solution example applies to isothermal bearing model with infinity length. Lubricating oil used in this model has Newtonian properties and dynamic viscosity in dependence on pressure. Results are presented in the dimensionless hydrodynamicpressure diagrams.
Źródło:: Journal of KONES; 2007, 14, 3; 297-303
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Pressure and velocity distribution in slide journal plane bearing lubricated with micropolar oil
Autorzy:: Krasowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/246956.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: micropolar lubrication
journal plane bearing
hydrodynamic pressure
velocity
velocity of microrotation
Opis:: Present paper shows the results of numerical solution Reynolds equation for laminar, steady oil flow in slide plane bearing gap. Lubrication oil is fluid with micropolar structure. Materials engineering and tribology development helps to introduce oils with the compound structure (together with micropolar structure) as a lubricating factors. Properties of oil lubrication as of liquid with micropolar structure in comparison with Newtonian liquid, characterized are in respect of dynamic viscosity additionally dynamic couple viscosity and three dynamic rotation viscosity. Under regard of build structural element of liquid characterized is additionally microinertia coefficient. In modelling properties and structures of micropolar liquid one introduced dimensionless parameter with in terminal chance conversion micropolar liquid to Newtonian liquid. The results shown on diagrams of hydrodynamic pressure, velocity and velocity of microrotation distribution in dimensionless form in dependence on coupling number N2 and characteristic dimensionless length of micropolar fluid Lambda 1. Differences were showed on graphs in the schedule of the longitudinal velocity oils after the height of the gap in the flow of the micropolar and Newtonian liquid. In presented flow, the influence of lubricating fluid inertia force and the external elementary body force field were omitted. Presented calculations are limited to isothermal models of bearing with infinite breadth.
Źródło:: Journal of KONES; 2010, 17, 2; 249-256
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Fatigue strength of wood polymer composite
Autorzy:: Kyzioł, L.
Powiązania:: https://bibliotekanauki.pl/articles/242494.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modified wood
mechanical properties
fatigue strength
device to inflict plane stress
Opis:: This paper presents the results of a study on the fatigue strength in pendulum bending natural and modified pinewood. The contents of polymethyl methacrylate (PMMA) were determined in wood-polymer for mechanical and rheological properties. The study of the bending fatigue strength and creep was realized on suitably prepared samples and research positions. Test results were documented in the form of charts and scraps. Differences in the decay of the natural and modified wood samples were observed after the attempt of the fatigue strength. The various mechanical properties of the sapwood, hardwood, and the polymer, influence on the stiffness of the individual components and consequently the whole composite. The process of fatigue degrades the structure of natural wood and wood polymer composite, the result is a gradual reduction of its stiffness. The Study of the creep behaviour was realized in stress in the sample of the level of 30% of the tensile strength. The samples were loaded longitudinally and transversely to the direction of the fibres. Significant differences of composite deformations were observed both as for the direction of the loaded fibres as well as the natural and modified wood. The character of changes in the fatigue strength and creep behaviour of the studied materials is implies to the influence of the polymer content on mechanical properties of modified wood. The tests carried out on account of the possibility of using wood polymer composite in sea constructions. Research carried out in connection with the possibility of the use of wood polymer composite marine construction. Modified wood can be used for keel blocks, decks, fender beam, bearings cantilevered shaft lines and the construction of yachts.
Źródło:: Journal of KONES; 2014, 21, 1; 139-146
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Capacity forces in slide journal plane bearing by laminar unsteady lubrication
Autorzy:: Krasowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/247548.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: journal plane bearing
lubrication
unsteady laminar oil flow
pressure distribution
capacity forces
Opis:: This paper shows results of numerical solutions an modified Reynolds equations for laminar unsteady oil flow in slide journal bearing with planar linear gap. Discussed case of the solution to the Reynolds equation for the unsteady laminar Newtonian flow of lubricating factor allows initial estimation of hydrodynamic pressure distribution and its capacity as a basic operational parameter of the slide bearing. Unsteady axial velocity perturbation on the race surface and slide has influence on the hydrodynamic pressure distribution of the capacity of the lubricated gap. Pressure changes in the bearing are seasonal and equal to the lasting period of velocity perturbation. The level of changes and its nature depends on the kind of perturbation. This solution example applies to isothermal bearing model with infinity length. Lubricating oil used in this model has Newtonian properties and dynamic viscosity in dependence on pressure. It shows a preliminary analysis change of capacity forces in the bearing by laminar, unsteady lubrication caused by velocity perturbations of oil flow in the longitudinal direction of a bearing. Described effect can be used as an example of modeling the bearing friction node operations in reciprocating movement during exploitation of engines and machines. Plane crossbar journal bearing occur in ship combustion engine as a crosshead bearing. Results are presented in the dimensionless hydrodynamic pressure and capacity force diagrams.
Źródło:: Journal of KONES; 2008, 15, 3; 245-252
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Shear stress in measuring section of the sample with modified wood
Autorzy:: Kyzioł, L.
Powiązania:: https://bibliotekanauki.pl/articles/242608.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modified wood
mechanical properties
Iosipescu shear test
device to inflict plane stress
Opis:: The shear strength of anisotropic materials is carried out on the special samples and on the appropriate instrumentation. Research conducted to obtain a homogenous state of the shear stress in the plane sample is difficult, and involve numerous occurrence of additional stress. Therefore, it is difficult to determine the shear strength. The wood composites are classified as orthotropic materials. In addition, are composed of the layers early wood and latewood. The layers have different thicknesses and exhibit different strength properties. The principal method for determining the shear stress is the trial of twisting of thin-walled tubes. Production of the pipe samples from the wood to determine the shear stress is impossible, due to annual rings. Beginning of destruction of samples under load was registered by a prototype device. This device makes the realization of plane state of stress in the sample possible. The position of the axis of the sample relative to the direction of the load can be varied. Such configuration axle of the sample to the loading direction, allows to perform, also stretching or compression besides to shear. The tests were performed for the natural wood and surface modified wood. The paper presents an original method and device designed to determine the shear strength of anisotropic materials on the example of natural wood and a surface modified wood.
Źródło:: Journal of KONES; 2016, 23, 1; 193-198
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Selected issues rules of weight control aircraft
Autorzy:: Stańczyk, P.
Stelmach, A.
Powiązania:: https://bibliotekanauki.pl/articles/246703.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: balancing plane
centre of gravity of the airplane
weight of the load
Opis:: In the era of dynamic development of the sciences, uninterrupted security is a priority for each of the sectors of transport. Flight safety depends on many factors that determine the quality and number of operations performed and functioning air transport system whereas the means of transport which is the aircraft. By factors must be understood as any action case, condition or situation where the existence or non-existence increases the probability of failure of the flight. The technical and organizational complexity of air transport system, a multitude of aviation personnel, the operation of the aircraft in various weather conditions are sources of various factors affecting flight safety. This article presents one of the very important things that must be done before every flight - the balance of the aircraft, which is a way of determining the centre of gravity plane COG, moreover, in the article also describes the weight of the passenger. Exemplified filled sheet loading and balance for Boeing B737-400 with the necessary tables, indexes, aimed at normalizing the data. Presented article is an introduction to the issue of control of the weight of the aircraft, taking into account the mass of passengers and their impact on the respective position of the centre of gravity of the aircraft.
Źródło:: Journal of KONES; 2016, 23, 3; 495-503
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Influence of a crosshead rate and a number of stress cycles on measurement results in the in-plane shear test for a cross-ply vinylester-carbon laminate
Autorzy:: Bondyra, A.
Gotowicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/245931.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vinylester-carbon laminate
regular cross-ply laminate
in-plane shear test
experimental procedure
Opis:: The paper presents some experimental studies on a regular cross-ply laminate of the [(0/90)F] 4S configuration. Each layer is VE 11-M vinylester resin (the manufacturer: ,,Organika-Sarzvna" Chemical Plants, Sarzyna, Poland) reinforced with plam weave carbon fabric of parameters: Stvle 430, Carbon 6K, substance 300g/m2, warp/weft 400/400 tex, 3.7/3.7 yarn/cm (the manufacturer: C. Cramer GmbH & Co. KG Division ECC). The orthotropic laminate was produced by ROMA private enterprise In Grabowiec, Poland, using the vacuum molding method and the technological parameters developed by ROMA taking into account the VE 11-M material specijication. The PN-EN ISO 14129:1997 standard [1] and closely related standards [2-9] were taken into consideration in experimental studies on the static in-plane shear response by a tensile test of a [(plus or minus 45)F]nS laminate. A program of the experiments was focused on testing a rate of a testing machine crosshead and a number of static stress cycles. An influence of these factors on the in-plane shear modulus was investigated. Based on the conducted investigations, the modified experimental procedure has been proposed for determination of the correct value of the in-plane shear modulus and the in-plane shear strength.
Źródło:: Journal of KONES; 2010, 17, 1; 29-40
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: The safety factor determination of composites structure cabin of "I - 23 Manager" airplane for loads during turnover
Określenie współczynnika bezpieczeństwa kompozytowej struktury nośnej kabiny samolotu "I - 23 Manager" dla przypadku kapotażu
Autorzy:: Frączek, K. S.
Powiązania:: https://bibliotekanauki.pl/articles/243185.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: lotnictwo
budowa samolotów
współczynnik bezpieczeństwa
analiza teoretyczna
Hilla metoda
kompozyty
aeronautics
plane design
safety factor
theoretical analysis
Hill's method
composites
Opis:: This paper contains results from practical test of airplane I - 23 Manager for loads during turnover. The measurements in separated points had been taken and compared with theoretical simulations, calculated in finite element method. The both results were identical only up to 50% of normal loads when using linear analysis. The factor safety for theoretical linear analysis and Hill's method was not true, because real body of airplane was broken before necessary load limit requirements by IKCSP. The linear method had been changed into geometrical non-linear method, because the latter more precisely showed deformations and strains, stresses in layers of all composite elements in the cab in the range of required loads. This article presents only the progress philosophy which showed most rational in respect of technical and economic point of view. The solution of design approach was reached with a method of following non-linear simulations which from formal was not here introduced. The finished construction was not presented because the relevant data is legally protected by Institute of Aeronautics.
Artykuł zawiera omówienie przebiegu próby statycznej samolotu I - 23 Manager podczas kapotażu. Przebieg praktycznego testu był rejestrowany i wyniki z pomiarów można było porównywać z wynikami z obliczeń wykonanych metodą elementów skończonych. Otrzymywano zgodność obliczeń z wynikami z próby statycznej jedynie do poziomu 50% obciążenia dopuszczalnego przy zastosowaniu liniowej analizy. Wyznaczone współczynniki bezpieczeństwa mimo zastosowania zalecanej metody nie sprawdziły się, ponieważ rzeczywista konstrukcja uległa zniszczeniu przy mniejszym obciążeniu niż jest wymagane przepisami IKCSP. W celu zwiększenia dokładności obliczeń teoretycznych metodę liniową zastąpiono ją metodą z tak zwaną nieliniowością geometryczną, która umożliwiła znalezienie przyczyn przedwczesnego zniszczenia konstrukcji i wyznaczenie współczynników bezpieczeństwa w każdej z warstw kompozytu i w całym zakresie obciążeń. Artykuł ten przedstawia jedynie filozofię postępowania, która okazała się najbardziej racjonalna pod względem technicznym i ekonomicznym. Docelowe rozwiązanie konstrukcyjne zostało osiągnięte metodą kolejnych nieliniowych symulacji, które ze względów czysto formalnych nie zostało tu przedstawione.
Źródło:: Journal of KONES; 2007, 14, 2; 145-152
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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