Temat: Numerical Simulation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical testing of landing gear system for different drop velocities
Autorzy:: Krasoń, W.
Małachowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/245668.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: landing gear
numerical simulation
drop velocities
touchdown
Opis:: The FEM model of the landing gear was developed to determine efforts of individual structural members while simulating the landing-gear drop, and to investigate how the energy of such a system changes; also, to find what kinds of deformations occur in individual components, and to investigate into the effectiveness of the damping system. In the developed numerical model of the landing gear account was taken also of the support-wheel-related subassembly, which includes such elements as: the wheel pin, the wheel rim, and the tyre. All parts of this subassembly, belt in the tyre excluded, were represented with the flexible hexagonal elements. results of numerical analyses for some selected drop tests and results from experiments carried out on a real landing gear confirm high quality of results gained from the dynamic simulation in the model of a complete landing-gear configuration. The advantage of the presented numerical method is applicability there of to landing gear testing for the very wide range of drop velocities, what is impossible to be performed with other methods, including experimental testing work. Paper show the geometric model of the main landing gear, a discrete model with the shock-absorber model included, the fringe of the landing gear deformation at the flnal stage of touchdown phase respectively from experimental and numerical tests and the maps ofmaximum principal stresses and how they change within the area of the welded joint that connects the upper and lower levers of the main landing gear.
Źródło:: Journal of KONES; 2009, 16, 4; 241-246
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Optimization of a nonconventional engine evaporator
Autorzy:: Kovalčik, A.
Toporcer, E.
Powiązania:: https://bibliotekanauki.pl/articles/246938.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: nonconventional engine
evaporator
numerical simulation
mesh
flow
Opis:: The papers deal with the optimization of the evaporator of a nonconventional combustion engine. Lithium bromide liquid (LiBr - an alternative cooling medium) flows in a cooling circuit of a nonconventional energetic unit. The solved energetic system is defined in the area of trigeneration systems. The mentioned system is a source of electric energy, cold and heat too. The space geometrical model corresponding to the geometry of the original evaporator is created in the CAD (Computer Aided Design) software CATIA. Only one half of the evaporator is created because of the decrease in the demand on the computational means. This CAD model is then imported into the preprocessor Gambit. The imported model is repaired and a suitable mesh is then created. The last step is the definition of the types of boundary conditions. The completed computational mesh is then exported from Gambit and imported into the CFD (Computational Fluid Dynamics) software Fluent. Fluent is used for the numerical simulation of the cooling medium flow in an evaporator. The simulation shows the filling of the evaporator cone, the time when the cooling medium starts to pour through the edge of the evaporator cone, the filling of the evaporator ring and finally also the fact that the off-take is able to take away the needed amount of cooling liquid from the evaporator.
Źródło:: Journal of KONES; 2010, 17, 2; 217-223
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modelling of tracked vehicle dynamics
Autorzy:: Kciuk, S.
Mężyk, A.
Powiązania:: https://bibliotekanauki.pl/articles/246193.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: multibody
trucked vehicle
numerical simulation
dynamical analysis
suspension
Opis:: The paper presents the problem of modelling dynamics of motor vehicles in the convention of multi-segment systems. The assumptions used in modelling process arepresented and the characteristics of elastic - damping elements of tracked vehicle suspension system are determined. This paper presents the identified mass and the geometrical parameters of the vehicle, on the basis of these parameters in Virtual.Lab software environment the simulation model was developed. The model describes the elements of a tank that does not change their position relative to the reference coordinate system, they are: the turret, muzzle, body case, and other components such as: wheels, torsion shafts, damper levers and links. The tank tracks are omitted in the simulation model. The results of numerical simulations in the form of displacement courses of characteristic points of the hull and displacements of the wheels axles in an assumed reference coordinate system are also included. The simulation results were compared with experimental results obtained on the proving ground. The results of experimental measurements carried out on the tank range, were used to precise tune a mathematical model of the vehicle. The results of numerical simulations confirmed validity ofthe assumptions in the modelling process, since good agreement was obtained with results from experimental investigations. The developed models will be used to optimize the characteristics of vehicle suspension.
Źródło:: Journal of KONES; 2010, 17, 1; 223-232
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of number of step reactions on flame parameters under quenching conditions
Autorzy:: Gutkowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/242109.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: flame propagation
quenching diameter
flame propagation velocity
numerical simulation
Opis:: Last decade, construction and using of microscale gas-turbines and internal combustion engines is collecting growing attention. However, the flame propagation limitations impede the development of micro and mesoscale combustion devices. Due to its small scale, increasing effect of flame-wall interaction causes a large heat loss and in consequence flame quenching. Both, fundamental experimental work and numerical simulations are conducted in order to overcome quenching issues. The most basic analysis concerns flame behaviour in small scale devices are premixed flame propagation in narrow tubes. There are two possibilities of flame-flow configurations: flame moving in a stationary mixture and a stationary flame in mowing mixture. These configurations have influence on flame shape, flame propagation velocity and quenching diameter. Most of numerical investigation assumes single-step reaction. It means that for flames propagating in propane-air mixtures C3H8 reacts directly with oxygen and leads to CO2 and H2O. This chemical kinetics mechanism omits existence of CO in reaction zone and in combustion products. Therefore it is interesting to use two-step reactions mechanism and compare the results with those obtained from single-step reaction model. The purpose of this analysis is to find influence of number of reaction steps on flame behaviour under quenching conditions for flames propagating in stationary lean propane-air mixtures. Quenching diameter, flame propagation velocity are determined and analyzed.
Źródło:: Journal of KONES; 2011, 18, 2; 153-159
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Experimental and numerical three-point bending test for sandwich beams
Autorzy:: Czechowski, L.
Jankowski, J.
Kotełko, M.
Powiązania:: https://bibliotekanauki.pl/articles/242768.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: numerical simulation
bending tests
composite materials
sandwich beams
honeycomb
Opis:: The article deals with an experimental investigation of mechanical properties of sandwich beams obtained from bending tests. The tested specimens consisted of foam or honeycomb core and face sheets made of aluminium alloys, plywood or composite material. The face sheets and the core were bonded with glue material. Beams of different dimensions, namely beam width, as well as core and face sheets thickness, were tested. Three point bending tests were carried out, which mid span deflections of the beam versus applied force were recorded. Experimental test results were compared with simulations on the basis of finite element method. The full, non-linear analysis, taking into account large displacements and using contact elements was performed. The obtained results are presented in loaddeflection diagrams. Some conclusions concerning ultimate loads and failure behaviour of tested beams made of different materials have been derived.
Źródło:: Journal of KONES; 2017, 24, 3; 53-62
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Composite-polymer materials for energy-absorbing structures
Autorzy:: Barnat, W.
Niezgoda, T.
Ochelski, S.
Powiązania:: https://bibliotekanauki.pl/articles/246205.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: energy absorption structures
safety
composites
numerical simulation
energy absorption investigations
Opis:: On the basis of the results obtained from our own experimental investigations of energy- absorbing elements, the influence of the given factors on absorbed energy (WEA) was determined. The objects of the research were the samples made of epoxy composites reinforced with glass fibres formed in roving, roving stripes and glass mat as well as with carbon fibres formed in roving and carbon roving stripes. To investigate the capability of hitting energy absorption of the samples in the shape of tubes, the truncate cones and in the shape of a thin cuboid were taken under consideration. The sample in the shape of tubes, wavy coats and thin cuboids with angle 45° (on one edge), play the role of the initiator of progressive destruction process. The composites matrix was taken into account during investigations: epoxy, the vinyl-esters, polyetheretherketones, reinforced with carbon and glass fibres with different structures of the samples. The influence of the sample geometry and the orientation of the layers in carbon / epoxide and the ar amid / the epoxide composites on the WEA absorption value were presented in the papers. The comparison of the structures made f rom single elements with relevant structures of four elements shows that absorbed energy is accumulating. In this case the relative absorbed energy remains at the similar level.
Źródło:: Journal of KONES; 2009, 16, 1; 21-34
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The innovations in description of propriety of structures the hyper-elastic materials
Autorzy:: Żach, P.
Powiązania:: https://bibliotekanauki.pl/articles/247644.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: plastics
hyperelastic materials
numerical simulation
identification of propriety elastomers materials
Opis:: The hyper-elastic materials e.g.: the elastomers, frothed structures PUR about open and closed pores, the materials using the matrix of natural rubber materials whether as well as synthetic the gels be practical used in different engineer applications from over 30 year s. They really several summers and intensive works on field of materiał engineering made possible extension the spectres of uses as well as the utilization of elastomers compositions. In this paper, will be presented built methodology of elasticity propriety materials with large deformation. In article be become presented method of identification and description of hyper-elastic materials from special return on numeric models the attention. Quantitative analysis be becomes executed in support about executed experimental investigations. The numeric permissive on comparison of received conception of description of hyper-elastic material worked out in support about theoretical foundations with results of experimental investigations analyses be become executed.
Źródło:: Journal of KONES; 2010, 17, 3; 533-538
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Numerical simulation the finite element method (FEM) of stress and strain for the chosen coatings TBCs on turbine blades loaded with laser impulses
Autorzy:: Kosiuczenko, K.
Napadłek, W.
Powiązania:: https://bibliotekanauki.pl/articles/248121.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: superalloy ŻS6K-WI
laser ablation
numerical simulation MES
Opis:: This paper presents the results of laser ablation the barrier coating TBCs (Al2O3, ZrO2) generated on aircraft engine turbine blade made for nickel base alloy ŻS6K-- WI. Authors used neodymium impulse Nd: YAG laser, radiation with a wavelength of 1064 nm. In parallel with the laboratory experiment was performed numerical simulation of laser ablation. FEM simulation results were used for to choose the relevant laser parameters (impulse duration, impulse shape and course in time, power density) and to identify the temperature distribution heat fluxes and the state of stress and strain in the critical zones of the barrier coating TBCs. The simulation was carried out using the finite element method program LS-Dyna. On the basis of numerical simulation shown the influence of the impact layer TBCs as a thermal insulation and shown place the appearance of destructive deformation. Defined distributed tension as a function of time and estimated time destruction parts the barrier layer during the laser ablation micromachining. Model 3D of the engine turbine blades DV - 2, Analyzed piece of blade, physical model, temperature maps, maps of the reduced stress are presented in the paper
Źródło:: Journal of KONES; 2012, 19, 1; 183-186
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Influence of the atmospheric turbulence on the accuracy of the missile targeting
Autorzy:: Kowaleczko, G.
Kaźmierczak, R.
Powiązania:: https://bibliotekanauki.pl/articles/950099.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: missile dynamics
stochastic turbulence
numerical simulation
dynamika pocisku
symulacja numeryczna
Opis:: The article presents results of simulation of 6-DOF motion for a missile subjected to atmospheric turbulences. Therefore, an applied mathematical model of motion includes description of stochastic turbulences influencing on missile flight. Both models of the motion as well as of turbulences are shortly presented. Model validity was assessed by comparing the calculation results with the data recorded during shooting on the range. Result of series of simulations allows determining the missile sensitivity to this case of disturbances. Exemplary results of simulations are shown. The turbulence model assumes that the wind is dependent on time and space. This assumption is based on the Taylor's "frozen turbulence" hypothesis. The advection velocity of the turbulence is much greater than the velocity scale of the turbulence itself. The velocity has two component. In the article, the first component is omitted and the second is treated as the stochastic process representing atmospheric turbulence. To describe this turbulence Shinozuka's method was applied. Mathematical description of the missile motion, equations of translatory motion, External forces end moments, model of the turbulence are presented in the article.
Źródło:: Journal of KONES; 2017, 24, 1; 211-222
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: FCFD analysis of the influence of winglets on the aerodynamic performance of the DA42 Diamond aircraft
Autorzy:: Szczepaniak, R.
Pożoga, Ł.
Stabryn, S.
Stryczniewicz, W.
Powiązania:: https://bibliotekanauki.pl/articles/244185.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: DA42 Diamond aircraft
lift force
drag force
winglets
numerical simulation
Opis:: The paper presents the application of Computer Aided Engineering software for an investigation of the aerodynamic performance of a small two-engine aircraft. In the presented study, the Computational Fluid Dynamics was applied in order to determine the influence of winglets on the aerodynamic performance of the DA42 Diamond aircraft. The numerical simulations were performed with the use of SolidWorks Flow Simulation software. In order to evaluate the influence of the winglets on the lift and drag force, two configurations of the selected aircraft were modelled: with and without winglets. The results of CFD simulations confirmed a reduction of induced drag caused by wingtips vortices dissipation introduced by winglets. The maximum reduction of the induced drag was achieved at high angles of attack. The authors visualized the structure of vortices in case of wings with and without winglets. A smaller volume of wingtip vortices in case of winglets application can be seen in the pressure distribution and streamline plots. The outcome of the presented work confirms the feasibility of Computer Aided Engineering for the assessment of aerodynamic performance of aircraft. The presented methodology can be used in the process of designing and optimisation of alternative configurations of aircraft. The results of work might prove useful for DA42 DIAMOND pilots and maintenance personnel as well as for educational purposes.
Źródło:: Journal of KONES; 2016, 23, 1; 361-368
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Numerical investigation of a landing gear system with PIN joints operating clearance
Autorzy:: Krasoń, W.
Małachowski, J.
Sołtysiuk, J.
Powiązania:: https://bibliotekanauki.pl/articles/246952.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: landing gear
joints operating clearance
finite element method (FEM)
numerical simulation
Opis:: In this paper, FE method is applied to determine an operating clearance influence on the dynamics of a military transport aircraft landing gear. The numerical analysis results presentation of two-dimensional landing gear model drop tests using MSC Working Model code is also shown. Numerical results agree well with respective experimental investigation ones. The analyses using two-dimensional rigid model were performed to correlate a numerical characteristic of a shock absorber substitute model with real shock absorber characteristic. A fully deformable spatial discrete FEM model of the landing gear was developed for precise analyses aimed at determining a joint clearance influence on a considered mechanical system dynamics. Calculations were performed using the so-called direct-integration procedure, colloquially called 'the explicit integration'. Additionally at this stage, the Rayleigh damping model has been included. The non-linear dynamic analyses were performed using the LS-DYNA code. The final part presents the comparison of drop tests numerical solution results of a landing gear with assembly clearance and with operating clearance. The advantage of developed numerical method is the possibility to determine energy changing, particular components deformations, joint contact forces, what is nearly impossible to record performing experimental investigation. The presented method is applicable for a variety of boundary condition i.e. drop velocities, aircraft effective mass, etc.
Źródło:: Journal of KONES; 2010, 17, 2; 241-248
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Numerical simulation of fatigue delamination growth under mode I loading conditions
Autorzy:: Bajurko, P.
Czajkowska, K.
Czarnocki, P.
Szeląg, D.
Powiązania:: https://bibliotekanauki.pl/articles/247320.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: polymeric composite
fatigue delamination
numerical simulation
fatigue test
Paris-Erdogen relationship
Opis:: Delaminations are common defects that deteriorate strength of laminates. Delaminations can arise in the course of manufacturing due to faulty fabrication process or can result from low energy impacts, (e.g. FOD), that can take place in service. Once a delamination has been detected, a question will arise whether the defective component can still stay in service or should be immediately repaired or replaced. Before the decision is made, one of the factors that must be considered is a possible delamination growth rate under the expected service cyclic loading. One of the most effective tools that help to answer this question is a numerical simulation of delamination growth. Relatively easy way to simulate fatigue delamination growth under Mode I loading conditions is presented. The a=f(n) relationship was simulated. The simulation was performed with the help of FEM. The delamination extension resulted from gradual reduction in the stiffness of cohesive elements of length t that were located along the expected delamination path. It was assumed that the delamination would extend by delta a=t if the cohesive element stiffness dropped to 0. The applied degradation procedure of the initial mechanical properties of the cohesive elements was based on Paris low. For each delamination, extension increment the degradation process was limited to the cohesive element adjacent to the delamination front. In case of laminates, so far, there is no standard procedure available to determine Paris low and the one used to determine it for the purpose of the simulation performed is presented, as well. The simulation was ended when the number of cycles simulated exceeded 1000 000. The numerical results were verified against the experimental ones resulting from the four specimens tested and a satisfactory agreement was found. The difference between the a=f(n) relationship obtained by the simulation and the one being the average of the four tests was smaller than the scatter of the tests results.
Źródło:: Journal of KONES; 2012, 19, 2; 17-24
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: The numerical - experimental analysis of ablative laser cleaning nickel - based superalloy
Autorzy:: Kosiuczenko, K.
Napadłek, W.
Powiązania:: https://bibliotekanauki.pl/articles/248048.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: superalloy ŻS6K-WI
laser ablation cleaning
numerical simulation MES
Opis:: The results of simulation the laser ablation cleaning for the surface of samples made for nickel-based superalloy ŻS6K-WI. this material is use to produce the first-degree blades of aircraft engine turbines. The laboratory investigations were used pulse neodymium laser Nd: YAG and laser ytterbium Nd: Y3Al5O12. In parallel with the experiment was performed numerical simulation of ablation process. The simulation results were used for selection of appropriate laser parameters (duration, pulse form and the course of pulse in time, power density). the short time of the phenomenon of ablation process (similar to 10 ns), the authors have chosen the finite element method (FEM) contained in the LS-Dyna. Since it is known that, the rate of thermal deformation is very large, for modelling the material properties of the material model was used Thermal-Elastic-Plastic. So chosen material model allows the dependence of material parameters (E, alfa, ni, Re, ET, Cp, k) on temperature. Scheme of laser ablation, diagram of laser power density, physical model, identification depth of the ablation, area where the temperature exceeded the melting temperature, in successive moments of loading are presented in the paper.
Źródło:: Journal of KONES; 2012, 19, 1; 187-190
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Flame quenching by the wall-fundamental characteristics
Autorzy:: Gutkowski, A.
Tecce, L.
Jarosiński, J.
Powiązania:: https://bibliotekanauki.pl/articles/243411.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: flame-wall interaction
quenching distance
flame parameters
flame speed
numerical simulation
Opis:: Knowledge of flame-wall interaction allowed us to understand the phenomena of near wall combustion and flame extinction. The study of near wall flame propagation is important because it is related to engineering applications, such as possible misfiring in internal combustion engines, optimization of combustion, and reduction of unburned hydrocarbons in the combustion products. In the present work different characteristics of the quenching distance were measured in square narrow quenching channels. The channel widths were changed from 2.5mm to 15mm, their length being 30cm. Propane/air mixture was employed in experiments. Direct visualization has been used to observe flame behaviour under quenching conditions. Numerical simulation revealed structure of limit flames during their propagation in quenching channels. It was found satisfactory agreement between numerical calculations and experiments. In conclusions it was confirmed that flame quenching depends on the relation between heat release rate to heat loss rate. Dead space appeared to be larger for rich mixtures in comparison with the lean ones. Flame curvature reached maximum value for stoichiometry and decreased for leaner or richer mixtures.
Źródło:: Journal of KONES; 2007, 14, 3; 203-210
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Numerical analysis of composite structures with embedded piezoelectric active elements
Autorzy:: Dębski, H.
Latalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/248153.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: composite material
smart structure
piezoelectricity
numerical simulation
PZT
macro fibre composite transducer
Opis:: The paper presents a numerical simulation of active multiple layer composite beams in bending test. Within framework of performed analysis glass-epoxy and carbon-epoxy laminates with integrated piezoelectric actuators were considered. In the research macro fiber composite (MFC) type transducers exhibiting d33 effect were used. The numerical models and further calculations were done in ABAQUS/Standard FEM software. Discrete models of the considered composite beam structures were formulated according to the Layup-Ply technique. In performed tests nonlinear geometric effects corresponding to large structural deflections were taken into account. The resulting state equations were solved by means of Newton-Raphson iterative method. Finally, the findings of numerical simulations were compared to the outcomes of laboratory experiments. A very good agreement of numerical and experimental results was achieved; this confirmed the assumptions made to the numerical model and further modelling technique. Numerical model of the piezoelement, analysis of a composite beam with piezoelectric patch, numerical tests for the separated M-8503-P1 piezoelement, electric boundary conditions for the examined actuator, strain state of a glass-epoxy laminate, laboratory test-stand, numerical and laboratory experiment results are presented.
Źródło:: Journal of KONES; 2012, 19, 1; 51-69
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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