Temat: Computer Simulation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Preliminary investigation of dynamic loads of the crew of the armoured personnel carrier during frontal crash
Autorzy:: Borkowski, W.
Hryciów, Z.
Powiązania:: https://bibliotekanauki.pl/articles/241797.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: armoured personnel carrier
impact
passive safety
computer simulation
Opis:: On the work one described chosen problems concerning of threats of the crew of the armoured personnel carrier with dynamic loads during crushing the obstacle. One paid attention on the lack of regulations regulative this problems. One described the general construction, and also worked out model of the armoured personnel carrier and crashed object. To the modelling one used the software LS-DYNA, using the method of finite elements. One gave also conditions for carrying out the numeric research. On the work one placed example results of numerical tests, deformations and stresses in the hull of the vehicle and in the crashed gate. One placed also example-courses of the speed and accelerations of chosen elements of the vehicle and people inside. On the basis on received results of simulation research one evidenced high level threats of the crews, liable to be effective with serious offences, particularly of the head and the spine. One qualified also directions and the range of further works targeting the improvement of the safety of the crew, in this taking into account the use of investigative dummy man. To further research one proposed models of dummy man Hybrid III, which for the necessity of taking in to consideration of additional elements of the equipment of soldiers (e.g. the helmet, the weapon, the bullet-proof vest) must be however properly modified. One pointed also on the necessity of working out the additional protective devices and also formulate the methodology of the experimental research.
Źródło:: Journal of KONES; 2008, 15, 4; 57-62
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Simulation researches of influence of compensation tank yolume on control parameters of cooling liquid temperature in the piston combustion engine
Autorzy:: Krakowski, R.
Walentynowicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/244033.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
cooling systems
mathematical modelling
computer simulation
Opis:: Mathematical model for simulation of operation of the cooling system for the combustion engine with the equalizing tank was described in this paper. Results of digital simulation of influence of the air volume changes in equalizing reservoir on the control parameters of liquid temperature in the cooling system were presented Simulation model was worked out in AmeSim computation system. It was put that the temperature of the cooling liquid should be raisedup to 125-130°C and the liquid pressure inside cooling system will be the main control parameter for pressure limited up to 0.3 MPa. Acceptable value of the pressure was provided by changing of liquid cooling intensity realized by switching two ventilators. The simulated courses of pressure, temperature, streams ofheat bringing to the cooling system, efficiency of the liquid coolingpump as well frequency of turning the ventilator were presented in this paper. It was also shown, that is possible to achieve the acceptable pressure level up to 0.3 MPa with interval plus or minus 0.005 MPa and obtain higher temperature of the liquid up to assumed value. It was shown that increasing air volume in the equalizing tank resulted decreasing freąuency of fun turning. The optimum capacity of the equalizing reservoir was determined.
Źródło:: Journal of KONES; 2010, 17, 3; 223-230
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ways of uneven road surface modelling used in the vehicle dynamics analysis
Autorzy:: Tengler, S.
Harlecki, A.
Powiązania:: https://bibliotekanauki.pl/articles/247939.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vehicle dynamics
uneven road surface modelling
computer simulation
Opis:: An important issue, which should be taken into account while analyzing the dynamics of vehicles moving along an uneven road surface, is the proper representation of its real shape. Two mathematical models of the road surface - continuous and discrete were considered in the method presented in this paper. These models were used in the computer simulations of dynamics of a special vehicle with a high gravity centre, which moved along an uneven road surface. The simulations were carried out using the worked out program package, in which four main modules could be differentiated such as: preprocessor, solver, postprocessor and 3D animation. This package was implemented combined with the Blender graphics environment – in authors’ opinion it is an innovative approach. Owing to this models of uneven road surface (theoretically of any shapes) can be built and they are input data for both the solver and animation modules. Additionally, the Blender tool can be used to prepare 3D objects, which are used in the animation process of the moving model of a vehicle. According to the authors', developed program package developed on the basis of the mathematical models for the analyzed vehicle and road surface can be interesting for engineers designing special vehicles. By performing different types of the computer simulations, the engineers can improve the vehicle being built and reduce cost of its road test.
Źródło:: Journal of KONES; 2012, 19, 1; 441-451
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence the higher temperature of the cooling liquid on operational parameter of the piston combustion engine
Autorzy:: Walentynowicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/242612.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
cooling systems
mathematical modelling
computer simulation
Opis:: The results of selected research of the results of the combustion engine cooling system which works with higher coolant temperatures are presented in this paper. The temperature of this liquid was increased to a higher level than the temperature of boiling water in normal conditions, by decreasing of heat transfer intensity. This presented system was designed for the four cylinder 4CT90 diesel engine with indirect fuel injection. Research was done on the engine dynamometer stand which was equipped with standard measure devices (for measuring: speed, torque, temperatures, and flow) and exhaust gas analyzers. By applying a pressure cooling system it was possible to maintain a stable, increased ca. 20 centigrade, coolant temperature for a standard engine cooling system at low overpressure 0.2 MPa. The results of increasing the cooler temperature were lower friction of unburned products during the combustion process (CO and HC) in the exhaust gas (up to 50%) at low torque and engine speed. This is the area where the catalytic reactor does not work because the exhaust gas temperature is too low. It was found that engine efficiency was increased up to 7% at maximum load and high engine speed. It is possible to achieve a temperature between 130 –140 centigrade for an overpressure of 0.3 MPa in the cooling system. It needs a special cooler, however, and leak proof pipes.
Źródło:: Journal of KONES; 2011, 18, 1; 671-676
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Testing the results of a passenger vehicle collision with a rigid barrier
Autorzy:: Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/245925.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: road safety barrier
crash tests
computer simulation
LS-DYNA
Opis:: High accident index in Poland, including one of the highest death rates in EU, forces undertaking the intense works in order to improve traffic safety. Published road accident statistics indicate that the most dangerous accidents include a vehicle collision with a tree, post or other road object. The road safety barriers make the road infrastructure elements that can signiflcantly protect against that type of accidents. The work presents basie tasks and requirements imposed on the barriers. Problems related to a proper selection of the barriers have been also highlighted. The tools facilitating the barrier design include numerical modelling. The modelling has been done by means of the LS-DYNA software, using the finite element method. A general structure and a developed barrier model as well as vehicle model have been presented. The conditions of the numerical tests have been also specifled. The work presents the results of influence of car impact angle with a rigid safety barrier. Presented results refer to a car o f mas s of 900 kg, making a bas is for the tests of the limiting systems for several limiting levels: including normal limit N2 (according to EN 1317-2). Compared to standard requirements, the scope of numerical tests has been extended by other car impact angle values. The work presents vehicle trajectories and deformations of their bodies. It also includes examples of velocities and acceleration courses and acceleration severity indexes (ASI) calculated on their basis. Obtained results indicate that the barrier location angle has a high influence on the safety level ofthe car passengers as well as on the car motion trajectory after collision
Źródło:: Journal of KONES; 2010, 17, 1; 51-57
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Numerical simulation of the standard TB11 and TB32 tests for a concrete safety barrier
Autorzy:: Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/247654.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: road safety barrier
crash tests
computer simulation
LS-DYNA
Opis:: The work presents the traffic safety issue related to a use of the road protective barriers. It describes a purpose and tasks that should be fulfilled by the safety system. Conditions of crash tests and their evaluation according to the requirements of the existing standard documents are also presented. The purpose of the work was to evaluate the influence of applied barrier type on the car collision process. A barrier composed of the segments that can move on the ground due to the impact force and a barrier fixed to the road surface were assumed for the model tests. The modelling was carried out by means of the LS-DYNA sofrware, using the finite element method. The tests were performed for two types of cars, mass of 900 kg and 1500 kg. The work includes the numerical test results, deformations of car bodies and barrier displacement. Examples of velocities and acceleration courses of selected vehicle elements and the ASI index, calculated on their basis, used for evaluation of the passenger danger level were also presented. Obtained results indicate a significant influence of the barrier installation method (joint with the road) on the collision process course and dynamic loads affecting the car passengers. They also indicate directions of safety improvement.
Źródło:: Journal of KONES; 2010, 17, 4; 63-71
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Studies on the effectiveness of the innovative road safety system
Autorzy:: Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Wiśniewski, A.
Powiązania:: https://bibliotekanauki.pl/articles/242956.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: road safety barrier
crash tests
computer simulation
LS-DYNA
FEM
Opis:: The paper evaluates the effectiveness of the innovative road safety system equipped with prototype component segments composed of a body made of a plastic filled with reinforced concrete. Main advantages of the new safety barrier include increased resistance to corrosion as well as easy transport and assembly directly on a road section being secured. Model tests were performed on a car of 900 kg weight allowing for carrying out the TB11 tests according to the EN 1317-2 standard. LS-DYNA software was applied for modelling, using the finite element method. The work presents the numerical test results, trajectory of vehicle movement after collision as well as the concrete barrier displacement. It also includes examples of stress in steel bars and joint coupling. Detailed assessing of simulation test results were made on the basis of ASI, THIV and PHD index. They were calculated on the basis of velocity and acceleration courses of selected car bodywork points. Numerical test results confirm the fact that this system meets the normative requirements. They allow for qualifying that system for B impact severity level and W4 working width. The results presented in the paper make the initial stage of the study and further calculations will be oriented towards a possibility of meeting the requirements for higher restraint levels.
Źródło:: Journal of KONES; 2014, 21, 2; 27-32
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Method of regulation condition assessment of turbine jet engine in flight basing on signals recorded during ground tests
Autorzy:: Golak, K.
Powiązania:: https://bibliotekanauki.pl/articles/246520.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: regulation
computer simulation
turbine jet engine
parametric diagnostics
ground tests
Opis:: During exploitation process operation quality differences may be observed between each particular machine and occurring in exploitation of one machine. These differences result from deviations of realized service process. Turbine jet engine regulation process was realized during ground tests. However, due to varying reactions of engines to external distortions, such as rocket launching, air swirl from another plane etc. as well as lack of possibility of simulation of in-flight conditions on ground (e.g. by partial choking of air intake), a situation may occur in which engine properly regulated on ground may not present sufficient efficiency in flight. Hence, the necessity to assess turbine jet engine regulation condition in flight basing on its ground tests. Research realized on computer models presenting engine operation both in flight and during ground tests indicated that real possibility of engine in flight regulation condition assessment based on its ground tests does exist. As was also noticed, with known input signal “w” and output signal “yW” recorded during engine ground tests as well as input “e” and output “u” signals from regulator during given test spectral powers and cross spectral powers of signals Swyw, Sww, See, Seu may be calculated and thus HW transfer function describing engine operation during ground test and GR transfer function describing regulator operation during given test and hence obtain transfer function HZ describing engine in flight. This grants possibility of regulation condition assessment of turbine jet engine in flight using signals recorded during ground tests.
Źródło:: Journal of KONES; 2012, 19, 3; 125-134
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Simulation model of the means of transport maintenance process
Autorzy:: Landowski, B.
Powiązania:: https://bibliotekanauki.pl/articles/247753.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modelling
operation and maintenance process
transport system
urban public transport
computer simulation
Opis:: The real operation and maintenance processes of technical objects are characterised by so called secondary action, it means that the values of the features describing the process states and the analysed operation and maintenance states of technical objects as well as the after-effect ofthose states depend not only on their present state, but very often on the state or sequence of the previous states, too. In spite of the fact that the mathematical models of the real processes are intrinsically a significant simplification of the actual state, it however seems that omission of a secondary action in a certain class of operation and maintenance processes is an excessive simplification and the results obtained from investigations of models of that type may be affected by a significant error. The paper presents a model of operation and maintenance process of means of transport characterised by a secondary action as well as an example of computer simulation of performance of a stochastic process describing the features of the operation and maintenance process under analysis. The elaborated model of operation and maintenance process of technical objects takes into account the specificity of the systems of the urban bus transport. The computer simulation of the maintenance process enables, among other things, to estimate the values of the chosen indicators characterising the investigated process. On the basis of the analysis of the statistical data, obtained from the operation and maintenance investigations, the values of the essential input parameters of the model were estimated. The considerations presented in the paper include an assumption that it is possible to distinguish n disjoint subsets ofhomogenous objects, from the point of view of the investigation purpose, in the set of the technical objects being operated and maintained in the system under analysis. The investigation object is a system of operation and maintenance of means of transport.
Źródło:: Journal of KONES; 2010, 17, 4; 271-276
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Comparative analysis of computer simulated and real structures of unwoven materials filtrating properties
Analiza porównawcza właściwości filtracyjnych komputerowo symulowanych i rzeczywistych struktur materiałów włóknistych
Autorzy:: Podsiadła-Bulsa, Z.
Powiązania:: https://bibliotekanauki.pl/articles/243621.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
filtry silnikowe
materiały filtracyjne
symulacja komputerowa
engines filter
filter materials
computer simulation
Opis:: The unwoven filtrating materials are usually used for design of engine filters. Their disordered structure is very difficult for mathematical description, therefore the computer simulation and modelling methods are used for approximation. The article presents assumptions of computer simulation of these materials and the results of their numerical analysis. The computer program enables to simulate the structures designed of the unlimited fibrous number. It is possible to change the length and thickness of the fibres as well as the number of layers forming the structure. The size of pores can be also defined in the simulated structure. For the comparison of the simulated and real filtrating material lit was used an unwoven synthetic material made with melt blown method on the polypropylene base. The medium thickness of fibres and the number of the layers was the same in the real material and in the simulated structure. The size of pores was determined using Barus Bechhold method in the real material. The great differences between the values of the size of pores in the simulated and real structure were caused mainly by simplifications applied for modelling of the disordered structure. Trial comparison of the results of computer simulation with the real structure of a fibrous filtration material shows on the essential differences in the dimensions of interfibre clearances existing in these structures.
Do budowy filtrów silnikowych obecnie powszechnie są stosowane włókniste materiały filtracyjne. Ich nieuporządkowana struktura jest trudna do opisu matematycznego, dlatego dla jej przybliżenia są stosowane metody modelowania i komputerowej symulacji. W artykule zaprezentowano założenia symulacji komputerowej tych materiałów oraz ich numeryczną analizę. Zastosowany program komputerowy pozwala projektować struktury złożone z dowolnej liczby włókien. Możliwym jest także zadawanie parametrów włókien takich jak długość i grubość oraz liczby warstw tworzących strukturę. Dla porównania struktury symulowanej z rzeczywistym materiałem filtracyjnym zastosowano włókninę syntetyczną wytworzoną metodą melt blown na bazie polipropylenu. Średnia grubość włókien oraz liczba warstw w materiale rzeczywistymi w strukturze symulowanej były taka same. Średnicę por w materiale rzeczywistym oznaczono za pomocą metody Barusa Bechholda. Duże różnice pomiędzy wartościami rozmiarów por w symulowanej i rzeczywistej strukturze zdaniem autora spowodowane są przede wszystkim uproszczeniami zastosowanymi w modelu struktury nieuporządkowanej. Próba porównania rezultatów symulacji komputerowej z rzeczywistą strukturą włóknistego materiału filtracyjnego wskazuje na istotne różnice wielkości prześwitów międzywłókiennych powstających w tych strukturach.
Źródło:: Journal of KONES; 2008, 15, 3; 443-449
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Minimization of dynamic forces in gear meshing by selection of the flexible couplings parameters
Autorzy:: Wojnar, G.
Powiązania:: https://bibliotekanauki.pl/articles/949494.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: couplings stiffness
couplings damping
power transmission systems
computer simulation
dynamic forces in meshing
Opis:: Torsional vibrations occur during drive systems operation. They may be especially hazardous if the freQuency of input functions is close to resonance frequency or if system resonance frequency is equal to subharmonic of input function frequency. What 's more, there is always a possibility of more than one resonance zone since the system is usually non-linear and multi-body. In design process of power transmission systems very important is correctly selection of the couplings parameters (especially flexibility). Couplings stiffness and damping have principle influence on shaft torsional vibrations. In case of power transmission with tooth gear the vibrations which are connected with dynamic forces in meshing. The paper presents influence of flexible couplings stiffness characteristics on dynamic forces in meshing. The investigations based on the measured couplings stiffness as well as damping and computer simulation ofpower transmission system with tooth gear operates at varying load. On the basis of conducted tests and analysis it may be stated that toothed wheels rotational speed increase does not always result in meshing dynamic forces increase. dynamic model ofdrive system with toothed gear is therefore a useful toolfor analysing couplings impact on meshing dynamic forces. This is illustrated by examples presented in current paper.
Źródło:: Journal of KONES; 2010, 17, 3; 497-504
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Results of preliminary experimental research and computer simulation concerning assessment of injury risk of occupants of military off-road vehicle impacting an obstacle
Wyniki wstępnych badań eksperymentalnych oraz komputerowej symulacji zagrożenia osób w trakcie uderzenia w przeszkodę wojskowego samochodu terenowego
Autorzy:: Orłowski, L.
Powiązania:: https://bibliotekanauki.pl/articles/246460.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: samochód terenowy
uderzenie
bezpieczeństwo bierne
ryzyko obrażeń
symulacja komputerowa
off-road vehicle
impact
passive safety
computer simulation
injury risk
Opis:: A survey was made on the available designs of guard rails, gates and other structures of the type, the "Dzik"-type vehicle might have to ram into during some operations. Basing on the conducted analyses, two typical models of those barriers were constructed. The first, rigid barrier had a form of concrete block of 6000 kg, while the flexible one was made of steel sections. Since no "Dzik" vehicle was available, a series of preliminary experiments were made on a "STAR" truck which had a similar frame and a bumper located at the same level. The vehicle was subjected to a proper load and during the experiment it impacted the constructed barriers. In the course of crash the values of most important parameters (forces, accelerations) were registered. The results obtained allowed for parametrical identification of a numerical model developed using the MADYMO software. Numerical simulations were performed for different crash speed with the numerical models of human and dummies adapted accordingly to take into consideration that the crew is supplied with bullet-proof jackets and helmets. Both the "sled-test" type numerical simulations, in which the accelerations measured in experiment were employed (after proper adjustment, for higher velocities), and simulations of the complete barrier-vehicle-occupant system were performed. Basing on the numerical simulation results the level of risk the crew is exposed to have been estimated, proving the necessity for developing a proper crew protection system. The scope of further experimental and numerical investigations, to achieve the goal, has been determined.
Przeprowadzono przegląd stosowanych rozwiązań w zakresie budowy ogrodzeń, bram i podobnych konstrukcji, dla których może pojawić się konieczność taranowania w trakcie akcji z wykorzystaniem pojazdu typu „Dzik". Na podstawie przeprowadzonych analiz opracowano dwie typowe przeszkody modelowe. Przeszkodę sztywną zrealizowaną w postaci betonowego bloku o masie 6000 kg na betonowym podłożu i przeszkodę podatną w postaci Stalowych kształtowników. Dla tak zbudowanych modeli przeszkód przeprowadzono serie badań doświadczalnych (dla bezpiecznych zakresów prędkości zderzenia) wykorzystując, wobec okresowego braku możliwości użycia pojazdu „Dzik", odpowiednio obciążony samochód STAR o zbliżonej konstrukcji ramy i takim samym poziomie zderzaka. Przeprowadzone badania eksperymentalne, w których rejestrowano przebiegi istotnych wielkości (sił, przyspieszeń) w trakcie zderzeń, pozwoliły na identyfikację parametrów modelu symulacyjnego opracowanego w środowisku systemu MADYMO. Przeprowadzono szereg symulacji komputerowych (dla różnych prędkości zderzenia) z wykorzystaniem komputerowych modeli człowieka i manekinów z bazy MADYMO. Oryginalne modele, opracowane dla zastosowań „cywilnych", zostały odpowiednio zmodyfikowane — uwzględniono fakt wyposażenia załogi pojazdu w czasie interwencji w kamizelki kuloodporne i hełmy. Przeprowadzono zarówno badania typu „sled-test", w których jako wymuszenie wykorzystano bezpośrednio przyspieszenia rejestrowane w czasie badań eksperymentalnych (odpowiednio przeskalowane dla większych prędkości), jak też badania pełnego modelu przeszkoda-pojazd-załoga. Wykorzystując wyniki symulacji komputerowych określono poziom zagrożeń dla załogi pojazdu uzasadniający potrzebę opracowania odpowiedniego systemu zabezpieczenia załogi. Określono również kierunki oraz zakres niezbędnych dalszych prac eksperymentalnych i symulacyjnych.
Źródło:: Journal of KONES; 2007, 14, 3; 485-494
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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