Autor: T.P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Thermomechanical FE analysis of the engine piston made of composite material with low histeresis
Autorzy:: Szurgott, P.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/244407.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: engine piston
composite piston
coefficient of thermal expansion
thermal analysis
FE analysis
Opis:: The main purpose of the preliminary analyses presented in the paper was to compare the behaviour of the combustion engine piston made of different type of materials under thermal load. A thermomechanical FE analysis of the engine piston made of composite material was shown. A selected engine is installed in one of the popular polish tanks. The proposed new material is characterized by a low hysteresis – the differences of the coefficient of thermal expansion for heating and cooling are not significant. The results obtained for the piston made of a new material were compared with those for the current standard material. The piston was loaded by a temperature field inside it. Appropriate averaged thermal boundary conditions such as temperatures and heat fluxes were set on different surfaces of the FE model. FE analyses were carried out using MSC.Marc software. Development of the FE model was also presented. Geometrical CAD model of the piston was developed based on the actual engine piston, which was scanned using a 3D laser scanner. A cloud of points obtained from the scanner was processed and converted into a 3- dimensional solid model. FE model of a quarter part of the piston was developed for the preliminary analysis presented in the paper. 4-node tetrahedron finite elements were applied since there was no axial symmetry of the considered object. The temperature field inside the piston was determined and presented in the form of contour bands. Contours of displacement and stress in a radial direction were shown as well.
Źródło:: Journal of KONES; 2011, 18, 1; 645-650
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical analysis of a shaped rail pad under selected static load
Autorzy:: Szurgott, P.
Gotowicki, P.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/248000.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: numerical analysis
FEM
rail pad
hyperelastic material
fastening
Opis:: Numerical analysis of selected type of the polyurethane rail pad is presented in the paper. A shaped pad with cylindrical-shaped elements in its working section was selected as a representative for the computational simulation. Analysis reflected the experimental test according to the valid standard. The test included loading of the vertical force perpendicular to the foot of the rail. Such test allows determining the static stiffness of the pad. The Mooney - Rivlin material model was selected in the current study. Necessary experimental tests including a uniaxial compression and tension were conducted to provide material constants for the hyperelastic material model applied for the FE model. Simplified FE models of the considered rail pad and the rail were developed. Rounded corners and edges of the cylindrical-shaped elements were omitted, since their modelling required a significant density of the FE mesh. Vertical force perpendicular to the foot of the rail was declared as nodal force distributed evenly along the edges of the selected finite element models Non-linear static analysis was performed using MSC.Marc software with large displacements and deformations taken into consideration. The obtained results allowed estimating deformations and the state of stress in a highly deformed rail pad. The static stiffness of the pad was defined as secant stiffness based on the vertical force - deflection curve.
Źródło:: Journal of KONES; 2012, 19, 1; 407-414
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: CI engine as a case study of thermomechanical FE analysis of the piston - piston rings - cylinder system
Autorzy:: Szurgott, P.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/247997.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: engine piston
composite piston
thermomechanical analysis
FE analysis
Opis:: The compression-ignition engine as a case study of a methodology of the numerical modelling and simulation of the piston - piston rings - cylinder system was presented in the paper. Thermomechanical FE analysis, taking into account thermal and mechanical loads, was carried out using the MSC.Marc/Mentat software. The mechanical loads included loads due to inertial and gas forces as well. A three dimensional solid geometrical model of the considered set was developed using AutoCAD software, whereas the finite element mesh was generated using Altair HyperMesh. Kinematic boundary conditions - the vertical displacement and acceleration of the piston - were described by the corresponding curves as a function of time for selected engine speed. Changes in pressure on the piston crown were estimated based on data from the engine manufacturer and the corresponded indicator diagram available in the literature. The results of thermomechanical FE analysis were presented in the form of stress and/or displacement contours. The main aim of the analysis was to determine the deformation of the piston depending of on the piston material. Two types of material were compared - the actual one PA12 aluminum alloy and the new composite material with low hysteresis. The second material was characterized by slight differences of the coefficient of thermal expansion for heating and cooling.
Źródło:: Journal of KONES; 2012, 19, 1; 399-406
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical study on the modification effect of the seat load acting on a soldier during the blast wave derived from IED explosion
Autorzy:: Sławiński, G.
Dziewulski, P.
Niezgoda, T.
Malesa, P.
Powiązania:: https://bibliotekanauki.pl/articles/241536.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vehicle safety
mine resistance
Improvised Explosive Device
occupant safety
FEM analysis
Opis:: The structure of a vehicle located in the explosion area of an anti-vehicle mine or an IED is subject to a strong impact of a blast wave. The explosion of a mine produces a blast wave that travels in all directions at a speed greater than the speed of sound. The level of risk to the crew of a military vehicle depends on their distance from the place of detonation, on the vehicle’s design and in particular on the design of the bottom of the hull and on the assembly and type of seats. The article provides the analysis of the impact of a side explosion on the crew of an armoured vehicle. Since the new classified version of the AEP-55 document, which defines the conditions for testing the resistance of military vehicles to explosions affecting their side, is not available, it was assumed in the numerical analysis that the charge weight of the explosive device is 100 kg TNT, placed between the central vehicle axles at the distance of 400 mm from the bottom and 1,000 mm from the lower board. Two cases were analysed: one where the Hybrid III dummy was placed on the reference seat and the other where it was placed on a modified seat. The analysis is conducted using the LS-DYNA explicit code. Only the vehicle’s hull is considered with suspension and the turret is modelled with mass.
Źródło:: Journal of KONES; 2016, 23, 3; 465-472
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 investigation of connector with elastomer joint
Autorzy:: Sławiński, G.
Malesa, P.
Niezgoda, T.
Bogusz, P.
Powiązania:: https://bibliotekanauki.pl/articles/245319.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: elastomer
connector
LS-Dyna
experimental tests
FEM analysis
Opis:: This paper presents works associated with the design, experimental tests and numerical analyses of a composite connector, which is a part responsible for increasing the safety of the soldiers. Nowadays researchers more and more often are searching for modern materials, which, as individual components or structures connected with other materials, meet the requirements of global markets. One of the most important branches of industry, which presently is growing increasingly are high technologies accompanying the safety of soldiers who are the passengers of a military vehicle. The proposed solution allows protection of the sensitive parts of body (e.g. legs), as well as the entire body of a soldier from the risks resulting from the impact of a pressure wave coming from explosion on the vehicle in which the soldier travels. A combination of classic materials, such as steel, and modern materials with hyperelastic characteristics might be an alternative to the currently used shock absorbers and dampers. Perspective can be using this assembly as a connector between a seat and the military vehicle body or special plates for protecting the crew’s feet resting on the floor of the vehicle during explosion of a mine or IED. The analysis is conducted using the LS-DYNA explicit code.
Źródło:: Journal of KONES; 2016, 23, 3; 473-480
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Walidacja pian niemetalicznych w złożonym stanie odkształcenia
The validations of constitutive models for non metallic foam under complex strain state
Autorzy:: Barnat, W.
Dziewulski, P.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/387115.pdf
Data publikacji:: 2009
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: walidacja
piana niemetaliczna
validations
non-metallic foam
Opis:: W niniejszym artykule przedstawiono wyniki badań energochłonności piany niemetalicznej obciążonej przemieszczeniem. Głównym celem pracy była walidacja modelu numerycznego spienionego polichlorku winylu wraz z oceną zdolności pochłaniania energii przez podstawowy element konstrukcji energochłonnej obciążonej dynamicznie. Elementy energochłonne przebadano w KMiIS. Badania przeprowadzono na maszynie wytrzymałościowej Instron. Obciążenie realizowano przez wymuszenie kinematyczne.
In the present article, the results of investigations of energy absorption foam structures weighted down were presented. The main objective of this study was the validations of constitutive models for non metallic foam. Investigations were conducted on Dynamic Testing System INSTRON in KMiIS. The load was applied by input function kinematic.
Źródło:: Acta Mechanica et Automatica; 2009, 3, 3; 5-8
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Investigation of human body exposed to blast wave derived from improvised explosive devices
Autorzy:: Sławiński, G.
Dziewulski, P.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/246647.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vehicle safety
mine resistance
improvised explosive device
occupant safety
FEM analysis
Opis:: The analysis of contemporary military conflicts shows, that the most dangerous threat for soldiers are Improvised Explosive Devices (IEDs). Blast resistance of military vehicles and structures is broadly discussed in many articles. However, information about human body response to impact loading is hard to find and very general. Both experi-mental trials with dummies and numerical analyses are needed. To design and develop better protection system it is necessary to identify and measure the effects of blast wave impact on crew of military vehicle. This paper presents numerical simulation results of special armoured vehicle subjected to mine threat of 8 and 10 kg of TNT. Possible effects of mine explosion on human body are described. Review of modern-mine and IED countermeasure solutions is presented. The analysis is conducted using LS-DYNA explicit code. Only vehicle’s hull is considered with suspension and turret is modelled using mass. Gravity is taken into account. Numerical model of Hybrid-III dummy is used. Accelerations and forces in tibia, neck and spine were calculated. HIC-36 criterion was also evaluated Different types of possible seat configuration are examined. Results show convergence between explosive size and injury risk.
Źródło:: Journal of KONES; 2015, 22, 4; 287-294
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: New method of carbon dioxide underground storage coupled with shale gas recovery
Autorzy:: Niezgoda, T.
Miedzińska, D.
Kędzierski, P.
Powiązania:: https://bibliotekanauki.pl/articles/246774.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: shale gas
carbon dioxide
storage system
Opis:: Shale gas is natural gas produced from shale, a type of sedimentary rock. Shale gas has become an increasingly important source of natural gas in the United States over the past decade, and interest has spread to potential gas shales in Canada, Europe, Asia, and Australia. One analyst expects shale gas to supply as much as half the natural gas production in North America by 2020. As of 2010, Poland imports two-thirds of its natural gas from Russia. ConocoPhillips has announced plans to explore for shale gas in Poland, along with Lane energy. The recently made available US Department of Energy report revealed that the largest reserves of shale gas in Europe are in Poland. The authors of the report calculate that Poland has reserves of about 22.45 trillion cubic meters of shale gas, of which 5.30 trillion cubic meters is immediately available for extracting. The most common method of shale gas recovery is hydraulic fracturing - the propagation of fractures in a rock layer caused by the presence of a pressurized fluid. Hydraulic fractures form naturally, as in the case of veins or dikes, and is one means by which gas and petroleum from source rocks may migrate to reservoir rocks. This process is used to release petroleum, natural gas (including shale gas, tight gas and coal seam gas), or other substances for extraction, via a technique called induced hydraulic fracturing. The method is critically assessed by ecologists. The paper deals with new method of gas shale fracturing and gas recovery coupled with carbon dioxide storage. It allows to effectively mine the shale gas and to store carbon dioxide in shale rock. It must be noticed that CO2 pollution is a very important problem in Poland, because of European Union CO2 limits. Also the numerical calculation of carbon dioxide thermodynamical process of decompression process, which simulates the injection of the cold liquid gas into the shale formation (high temperature and pressure conditions) and its influence on shale rock fracturing will be presented.
Źródło:: Journal of KONES; 2012, 19, 3; 327-333
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Thermal-mechanical coupled simulation
Autorzy:: Nguyen, H. P.
Derewońko, A.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/244229.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: thermo-mechanical coupled
simulation
plastic deformation
Opis:: Optimal design of engineering structures and technological processes requires taking into account various factors affecting the state of strain and stresses in the structure. Coupled thermo-mechanical analysis enables, among others, determination of undesirable changes in a body shape resulting from the implementation method of the initially-boundary conditions, for example, time-varying load and physical properties of the material depending on the temperature. They are also used to determine residual stresses remaining after manufacturing to prevent revalued stiffness and rigidity of the designed construction. In this study, coupled thermo-mechanical analysis illustrated by metal machining operation is presented. The commercial code MSC.Marc has been used to develop a coupled thermo-mechanical finite element model of plane-stress orthogonal metal cutting operations. Metal cutting is one of the most important and common manufacturing processes in the car industry. A thermal mechanical transient analysis is performed to convert mechanical work into heat by plastic deformation of the workpiece material and friction during metal machining operation. The finite element mesh distortion, due to large deformations, requires a remesh technique. The influence of parameters of the 2D and 3D finite element mesh adaptation on plastic deformation and temperature generated in the cutting processing is considered.
Źródło:: Journal of KONES; 2015, 22, 3; 161-168
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Numeryczne badania mat energochłonnych jako element zwiększający bezpieczeństwo załogi pojazdu wojskowego
Numerical study of energy-absorbing mats as an element increasing the safety of the military vehicle crew
Autorzy:: Sławiński, G.
Malesa, P.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/98858.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Śląska. Katedra Biomechatroniki
Tematy:: bezpieczeństwo żołnierzy
mata energochłonna
MES
LS-Dyna
soldiers security
energy-absorbing mat
Opis:: W pracy zostały przedstawione wyniki modelowania oraz symulacji numerycznych paneli energochłonnych absorbujących energię pochodzącą od wybuchu. Przedstawiono syntetyczny sposób analizy zagadnienia od opracowania geometrii po przygotowanie modelu numerycznego. Wyniki w postaci sił obciążających charakterystyczne punkty pomiarowe manekina Hybryd III 50th w wersji Fast oraz pozostałe charakterystyki przedstawiono w formie wykresów.
This study presents the results of numerical simulations of an energy absorbing panels as an element increasing the safety of the military vehicle crew. The simulations are made by a finite element method in LS-Dyna. A numerical Hybrid III 50th dummy is used to simulate the tibia axial compressive forces and accelerations. Simulations results are compared with literature data to validate the Hybrid III dummy. Forces and accelerations results are presented in the form of a charts.
Źródło:: Aktualne Problemy Biomechaniki; 2016, 11; 115-120
1898-763X
Pojawia się w:: Aktualne Problemy Biomechaniki
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Modeling of the shock wave impact on the flexible shell
Autorzy:: Derewonko, A.
Szurgott, P.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/238097.pdf
Data publikacji:: 2009
Wydawca:: Instytut Technologii Bezpieczeństwa Moratex
Tematy:: elastyczne powłoki
modelowanie fali uderzeniowej
fala uderzeniowa
shock wave
flexible coating
modeling of shock wave
Opis:: An underwater explosion is one of the possible threat which can occure during military operations and/or civilian usage. The ballistic protection systems are the method to reduce the impact of the high explosive (HE) charge blast wave. The aim of this paper is to present the influence of the shock wave on the flexible shell. The simulation of the underwater detonation is provided with use of the Finite Element Method (FEM). The influence of the distance between the HE charge and the flexible shell on its deformation was estimated. The results of the conducted analysis including explosion were compared with those obtained for the basic model with no explosion.
Źródło:: Techniczne Wyroby Włókiennicze; 2009, R. 17, nr 2/3, 2/3; 107-111
1230-7491
Pojawia się w:: Techniczne Wyroby Włókiennicze
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Numerical analysis of road infrastructure components on an example of SP -01, SP -04 and SP -09 barriers
Numeryczna analiza podatności elementów infrastruktury drogowej na przykładzie barier SP-01, SP-04 i SP-09
Autorzy:: Niezgoda, T.
Barnat, W.
Dziewulski, P.
Powiązania:: https://bibliotekanauki.pl/articles/246454.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
bezpieczeństwo
bariera drogowa
transportation
safety
road barriers
Opis:: The paper presents results of numerical investigations on elements of road infrastructure, such as the protective barriers. Three selected structural elements of road barriers: SP-01, SP-04 and SP-09 have been analyzed. For stakes, separators and guides modelling, shell type elements were applied. Specialised finite elements method software - MSC Dytran, permitting to quickly variable processes simulating -was used for analyse. Numeric simulations of crash process were done, for different configurations of structure solutions, and this permit to deeply analyze the road barriers deformation character. The chosen cases of numeric models were verified in empirical mode and this permit do make a total resistance analyze of all energy absorbing structure during crash. The SP-01 barrier has the littlest value of retardation impulse, which is the result of complicated method of structure deformation resulting from bending and torsion of the stake (using an extension arm). Such important energy absorption is due to system eccentricity, resulting from eccentricity due to a long connector. Obtained results will be used as guidelines to elaborate a method for such structures examination, and it will be possible to use them in the future research jobs in the frame of security augmentation in the road transport.
W artykule przedstawiono wyniki numerycznych prac badawczych nad elementami infrastruktury drogowej w postaci barier ochronnych. Analizie poddano trzy wybrane elementy konstrukcyjne barier drogowych SP-01, spP-04 i SP-09. Do zamodelowania słupków, przekładek, prowadnic użyto elementów typu shell. Do analizy wykorzystano specjalistyczne oprogramowanie metody elementów skończonych MSC Dytran pozwalające na symulacje procesów szybkozmiennych. Przeprowadzone symulacje numeryczne procesu zderzenia, dla różnych konfiguracji rozwiązań konstrukcyjnych, pozwoliły na dogłębne zapoznanie się z charakterem deformacji barierek drogowych. Wybrane przypadki modeli numerycznych zostały zweryfikowane w sposób doświadczalny, co pozwoliło na kompleksową analizę wytrzymałością całej konstrukcji energochłonnej podczas zderzenia. Najmniejszą wartość impulsu opóźnienia posiada bariera SP-01. Jest to spowodowane złożonym sposobem odkształcenia konstrukcji wynikłym ze zginania i skręcania (przez zastosowanie wysięgnika) słupka. Tak duża energochłonność spowodowana jest mimośrodowością układu wynikłą z mimośrodowości spowodowanej długim łącznikiem. Otrzymane wyniki posłużą jako wytyczne do opracowania metodyki badania tego typu struktur i będą mogły być wykorzystywane w dalszych pracach badawczych w zakresie zwiększenia poziomu bezpieczeństwa w transporcie drogowym.
Źródło:: Journal of KONES; 2007, 14, 3; 451-458
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Modelling and numerical simulation of symmetric vibrations of the KNI 140070 viaduct -ballasted track - KTX train system
Autorzy:: Szurgott, P.
Klasztorny, M.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/247456.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: railway bridge
composite bridge
ballasted track
KTX train
modelling and simulation
Opis:: The paper develops a new methodology of FE modelling and simulation of the bridge - track - moving train system with the use of CAE systems. The KNI 140070 viaduct of span length 14.40 m, located on the Polish Central Main Line, has been selected. The modernized track contains: 60E1 main rails equipped with Vossloh 300-1 fasteners, 60E1 side rails with SB3 fasteners, B 320 U60 sleepers, crushed stone ballast, approach RC slabs. A KTX (Korea Train eXpress) high-speed train, being a modification of a TGV train, is taken into consideration. A methodology of physical and numerical modelling of the viaduct, the track and the train was developed using Altair HyperMesh and LS-PrePost software. The FE model of a bridge superstructure consists of 4-node shell elements (main beams) and 8-node 48 DOF solid elements (reinforced concrete platform). RAIL TRACK and RAIL TRAIN modules available in LS-Dyna system were applied for simulating the train — trach interaction. Hughes-Liu beam elements were used for the rail modelling. Rail fastenings were simulated using one-dimensional discrete spring and damper elements. Carbodies, bogieframes and wheelsets were considered as rigid bodies and they were modelled using shell and beam elements. Cylindrical and revolute constrained joints and discrete springs and dampers were applied to connect all components of the FE model of rail-vehicles. The exemplary simulation of transient vibrations of the bridge - trach -train system has been made for service velocity 300 km/h. Contours of displacement and stress and selected time histories for displacements, accelerations and stresses, created in LS-PrePost and HyperView software, have been analysed.
Źródło:: Journal of KONES; 2010, 17, 3; 415-422
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Modelowanie i symulacja numeryczna wężykowania szybkobieżnego pojazdu szynowego Shinkansen na torze prostoliniowym
Modelling and numerical simulation of snaking of a high-speed Shinkansen rail-vehicle moving on a rectilinear track
Autorzy:: Klasztorny, M.
Niezgoda, T.
Dziewulski, P.
Powiązania:: https://bibliotekanauki.pl/articles/208662.pdf
Data publikacji:: 2011
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: dynamika pojazdów
pojazd szynowy Shinkansen
tor prostoliniowy
wężykowanie
modelowanie
symulacja numeryczna
dynamics of vehicles
Shinkansen rail-vehicle
rectilinear track
snaking
modelling
numerical simulation
Opis:: W pracy opracowano model dynamiczny 3D (fizyczny, geometryczny i numeryczny) japońskiego szybkobieżnego pojazdu szynowego SHINKANSEN poruszającego się po torze prostoliniowym niepodatnym, o stożkowatości szyn 1:20. Opracowano metodykę modelowania układu pojazd ruchomy-szyny (MV-R) oraz modelowania wężykowania z możliwością uderzeń bocznych obrzeży kół o główki szyn. Zastosowano licencjonowane oprogramowanie CATIA V5R15, HYPERMESH v10, LS-DYNA v971. Przeprowadzono badania symulacyjne wężykowania pojazdu SHINKANSEN w zakresie prędkości 100-300 km/h. Większość podukładów układu pojazd ruchomy-szyny (MV-R) zamodelowano jako bryły idealnie sztywne. Stalowe obręcze kół pojazdu oraz górne części stalowych główek szyn zamodelowano jako odkształcalne i wykonane z materiału izotropowego liniowo-sprężystego. Łożyska osi zestawów kołowych pojazdu SHINKANSEN zamodelowano za pomocą więzów CONSTRAINED_JOINT_REVOLUTE. Uwzględniono kontakt pomiędzy obręczami kół i główkami szyn typu AUTOMATIC_SINGLE_SURFACE, z zastosowaniem funkcji kary. Uwzględniono tarcie kinetyczne Coulomba na styku powierzchni tocznych i obrzeży obręczy kół i główek szyn. Analizowano przyspieszenia poziome poprzeczne reprezentatywnych punktów nadwozia oraz przemieszczenia poziome poprzeczne środków ciężkości zestawów kołowych.
The study develops the 3D dynamic model (physical, geometrical, and numerical) of a high-speed Shinkansen rail-vehicle moving on a rectilinear track of 1:20 rail-head conicity. A new methodology has been developed for modelling the moving vehicle-rails system (MV-R) as well as for modelling lateral vibrations of the vehicle, induced by snaking and possible impacts of wheel flanges onto rail heads. Advanced licensed CAE software has been applied, i.e., CATIA V5R15, HYPERMESH v10, and LS-DYNA v971. Numerical simulations have been performed for service velocities of a Shinkansen rail-vehicle ranged from 150 to 300 km/h. The partial geometric model of the MV-R system has been created with CATIA V5R15 software, using the Assembly Design, Part Design, Generative Shape Design modules. The geometric model in the universal form (the STEP file) has been carried into HYPERMESH v10 system in order to build the complete equivalent geometric model, to make FEM meshing, and to declare the initial and boundary conditions. Most subsystems have been modelled in LS-DYNA v971 as rigid bodies (MAT_020). Tyres and the rail heads are deformable and made of linear-elastic isotropic steel (MAT_001). Radial bearings of wheel-set axles have been modelled with CONSTRAINED_JOINT_REVOLUTE, as shown in Figure 1. The 1st and 2nd stage 3D linearly-viscoelastic suspensions (MAT_066) have been reflected with the zero-length elements of properties SECTION_BEAM, in Discrete Beam formulation. In order to activate gravity forces, the FE locations have been removed to the predicted final static state, and then the gravity forces reflecting the total weight of the vehicle have been put onto the wheel-set axle-bearing cases. After the dynamic relaxation process, all elements of the body and bogie frames had got the initial velocity in the longitudinal direction (coinciding the track axis), whereas the rotating parts (wheels and axles) had got the angular velocity about respective axle axes. In order to keep the constant service velocity, all wheel sets had got a constant angular velocity. In order to unbalance the rail-vehicle, the body has been loaded by lateral moment impact of rectangular shape and of 22 kNms value. The tyre-rail head contact of AUTOMATIC_SINGLE_SURFACE type has been used taking into account the penalty function. The kinetic dry friction coefficient is equal to 0.10. The average time step was equal to dt = 1.23 μs. The calculations in the LS-DYNA system have been performed using double precision. The real process lasting 7.2 seconds was simulated numerically for 104 hours, using 8 processors of the cluster. The final results constitute: lateral displacements and accelerations of the representative points of the body and the lateral displacements of the gravity centres of the wheel sets. Exemplary time histories are presented in the study. The main conclusions resulting from numerical simulations are as follows. The CAE software used in the study is a very effective tool for 3D numerical simulations of the MV-R system taking into consideration a curvilinear cross-section of the rail heads, the one-side contact of wheels and rails and the Coulomb friction. The simulations show that anti-symmetric unbalance rapidly tends to stable symmetric lateral vibrations of the bogies of frequency depended on the service velocity. The lateral vibration frequencies belong to the interval 1.7-4.2 Hz.
Źródło:: Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 1; 309-324
1234-5865
Pojawia się w:: Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Experimental investigations of the protective shield - protected plate - test stand system under blast shock wave
Autorzy:: Klasztorny, M.
Niezgoda, T.
Panowicz, R.
Gotowicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/247769.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: light armoured vehicles
protective shields
multi-layer shields
range tests
validation
Opis:: The study presents preliminary experimental range tests of a system for testing protective shields for light armoured vehicles. The shields are designed against HE mines and IEDs up to 10 kg TNT. The system consists of the multiple-use portable range stand, a protected Armox 500T plate and a protective shield. The latter consists of the following main layers: PA11 aluminum, the SCACS hybrid laminate, ALPORAS aluminum foam, and the SCACS hybrid laminate. The layers are connected together with SOUDASEAL chemo-set glue. Overall dimensions of the test stand are ~ 800x800x180 mm, the protected plate has dimensions 650x650x5 mm, and a protective shield is of 450x450x76 mm dimensions. The system rests on a St3 steel plate stiffening the range subsoil. The range stand designed to be resistant up to 10 kg TNT blasts is composed of three appropriately shaped rigid frames connected with six high strength erection bolts. The explosive charge is suspended centrally at 400 mm distance from the top surface of the stand. Two range tests have been performed, i.e.: 1) the protected plate without a protective shield under 2 kg TNT blast shock wave, 2) the protected plate with the protective shield under 2 kg TNT blast shock wave. The effectiveness of the protective shield is assessed via comparing the maximum plastic deflection of the protected plate in both systems. The experimental results have been used to validate the FE model of the system.
Źródło:: Journal of KONES; 2010, 17, 4; 229-236
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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