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Wyszukujesz frazę "Niezgoda, T." wg kryterium: Autor


Tytuł:
Validation of numerical models of metallic foams from the aspect of energy absorption
Walidacja modeli numerycznych pianek metalicznych w aspekcie energochłonności
Autorzy:
Włodarczyk, J.
Niezgoda, T.
Barnat, W.
Dziewulski, P.
Powiązania:
https://bibliotekanauki.pl/articles/243116.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
energochłonność
piany metaliczne
badania doświadczalne i MES
metallic foams
energy absorption capabilities
experimental investigations
finite element method
Opis:
The main objective of the paper is to assess the energy absorbing capabilities of metallic foams. The results of experimental investigation of energy absorbing capabilities for three metallic foams under kinematic loading are presented. The tests were conducted on the INSTRON Dynamic Testing System. The numerical computations were carried out using the LS DYNA code. For metallic foam modelling, MAT_26 (MAT_HONEYCOMB) was used; it is normally used for "honeycombs" and anisotropic foams modelling. For numerical calculations, two types of numeric elements were used: SOLIDE and Plate types. SOLID type elements were used for foam modelling, and Schell types -for charge definition. A numeric diagram is presented on drawing 10. As in the case of real tested elements, the foam element was charged by a plate of velocity of 5 m/s. The metallic foam was checked in Mechanics and Applied Informatics Faculty of Military University of Technology. Tests were made on INSTRON resistance machine. The charge was made using cinematic input function. Presented results are preliminary one, the experiment was made in order to choose a foam material having the best energy absorption characteristics. The conclusion of preliminary estimation of obtained results is that the samples with the smallest pores have the most important energy absorption level. Nevertheless, the following stage of the works should be impact resistance tests: deceleration test in the aspect of security improvement.
Głównym celem pracy była ocena zdolności pochłaniania energii przez piany metaliczne. W niniejszym artykule przedstawiono wyniki eksperymentalnych badań energochłonności trzech pian metalicznych obciążonych przemieszczeniem. Analizę numeryczna pianki metalicznej przeprowadzono w oprogramowaniu LS DYNA. Do modelowania piany metalicznej zastosowano MAT_26 (MAT_ HONEYCOMB) który jest używany głównie do modelowania "plastrów miodu" i pianek z właściwościami anizotropowymi. Do obliczeń numerycznych wykorzystano dwa rodzaje elementów numerycznych: typu SOLID i Plate. Elementy typu SOLID były wykorzystywane do modelowania pianki a typu Schell wykorzystywano do zdefiniowania obciążenia. Model numeryczny przedstawiono na rys. 10. Element piankowy został podobnie jak w przypadku badanych obiektów rzeczywistych obciążony płytą poruszającą się z prędkością 5 m/s. Pianę metaliczną przebadano w Katedrze Mechaniki i Informatyki Stosowanej WAT. Badania przeprowadzono na maszynie wytrzymałościowej INSTRON. Obciążenie realizowano przez wymuszenie kinematyczne. Przedstawione wyniki są wstępnymi, eksperyment został przeprowadzony w celu wybrania materiału piankowego o największej energochłonności. Na podstawie wstępnej oceny uzyskanych wyników można powiedzieć, że próbki z najmniejszymi porami posiadają największą energochłonność. Jednakże kolejnym etapem prac powinny być badania udarnościowe pomiaru opóźnień w aspekcie zwiększenia bezpieczeństwa.
Źródło:
Journal of KONES; 2007, 14, 2; 561-569
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Validation studies of the simplified model of the missile with cumulative head
Autorzy:
Sybilski, K.
Panowicz, R.
Kołodziejczyk, D.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/246839.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
RPG
simulation
FEM analysis
safety
slat armour
rod armour
Opis:
During ongoing conflicts around the world, some of the most dangerous threats are rocket-propelled grenades. They are light, easy to use and cheap, and their penetration reaches 900 mm of armoured RHA steel. Therefore, in many experimental and numerical laboratories there are researches of different, in aspect of shape, dimensions and used material, types of rod armours protecting against such a threat carried out. This kind of research must be confirmed in the last part of design by appropriate field tests. However, at the beginning of the design process, it is important to find a fast method of testing the developed solutions in a manner, which allows us to observe and measure as many process parameters as possible. One of such tests is research with the use of simplified models built in an appropriate scale. Small dimensions and simple construction result in the fact that the cost of manufacturing of models is much lower, and time is shorter. Tests on the simplified models are also possible to be carried out in laboratory conditions, what reduces the costs and makes the measurements of physical properties easier. The article describes experimental investigations of the impact of a simplified missile with a shape charge jet head model into a thick plate and steel rods. The construction of a missile, the used equipment and apparatus as well as the proceedings of the experiment are presented. The paper provides information about the structure of FE model and both initial and boundary conditions of the examined system. The results of numerical analysis are presented and compared with the results from experimental tests.
Źródło:
Journal of KONES; 2012, 19, 3; 415-420
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of a multi - component ballistic panel
Autorzy:
Stanisławek, S.
Morka, A.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/243005.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
computational mechanics
ballistic protection
composite armour
ceramics
Opis:
The paper presents a numerical study of a two layer composite panel impacted by an AP (Armour Piercing) 14.5x118mm B32 projectile. The panel consists of a number of pyramid ceramic components supported by an aluminium plate. The studied model is compared with a reference structure in which ceramic layer is in a form of a plate. The problem has been solved with the usage of modelling and simulation methods as well as a finite elements method implemented in LS-DYNA software. Space discretization for each option was built with three dimension elements guaranteeing satisfying accuracy of the calculations. For material behaviour simulation, specific models including the influence of the strain rate and temperature changes were considered. A steel projectile and aluminium plate material were described by Johnson-Cook model and a ceramic target by Johnson-Holmquist model. In the studied panels, the area surrounding back edges was supported by a rigid wall. The obtained results show interesting properties of the examined structures considering their ballistic resistance. All tests have given clear results about ballistic protection panel response under AP projectile impact. Panels consisting of sets of pyramids are slightly easier to penetrate. Despite this fact, a ceramic layer is much less susceptible to overall destruction what makes it more applicable for the armour usage. Furthermore, a little influence of the projectile impact point and consequently a part of the pyramid, which is first destroyed, is proved.
Źródło:
Journal of KONES; 2012, 19, 4; 585-588
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of an influence of ceramic plate surrounding by metal components in a ballistic panel
Autorzy:
Stanisławek, S.
Morka, A.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/247100.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
computational mechanics
ballistic protection
composite armour
ceramics
Opis:
The paper presents a numerical study of the three layer composite panels impacted by an AP (Armor Piercing) 7.62x51mm projectile. The standard panel is built with aluminum and Al2O3 ceramic plate. The studied model, however, consists of the same aluminum plate but the ceramic one is surrounded by a steel packet. The problem has been solved with the usage of the modelling and simulation methods as well as finite elements method implemented in LS-DYNA software. Space discretization for each option was built with three dimension elements guaranteeing satisfying accuracy of the calculations. For material behaviour simulation, specific models including the influence of the strain rate and temperature changes were considered. Steel projectile and aluminum plate material were described by Johnson-Cook model and ceramic target by Johnson-Holmquist model. In the studied panels, the area surrounding back edges was supported by a rigid wall. The obtained results show interesting properties of the new structures considering their ballistic resistance. The ballistic protection of a three layer panel under the WC projectile impact is indentified. Panels containing the ceramic plate surrounded at each side by a steel packet plate are stronger. However, this difference reaches only the level of 2.4% regardless erosion parameters. Definitely technological complication and an area density mass increase cannot balance a small improvement of ballistic protection. However, this kind of panel is not suggested as a useful solution. Further investigations are suggested in order to analyze an influence of initial ceramic compression. The results of those numerical simulations can be used for designing of modern armour protection systems against hard kinetic projectiles.
Źródło:
Journal of KONES; 2011, 18, 4; 471-474
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of auxetics in structure strength
Autorzy:
Stanisławek, S.
Morka, A.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/241667.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
computational mechanics
auxetics
negative Poisson's ratio
material engineering
Opis:
The paper deals with computer simulations of mechanical behaviour of a no-void ideal auxetic isotropic material. Current literature offers wide range of models which resemble the manufactured or natural structures. However, it does not answer the question how a change into auxetic no-void state would affect the continuum effective mechanical properties. Auxetic with the Poisson ratio -0.3 has been compared through typical tests to a classic steel elastic material. Most of the engineering software cannot precede Poisson ratio helow zero. Therefore a unique technique was applied using equation of state to overcome this obstacle. All simulations have been done in elastic regime. For the tensile compression tests a 10 mm edge cube was modelled, the bending test used a 5x5x250 mm bar. The loading for initial tests was realized as a kinematic displacement of particular nodes. For bar bending a force was applied in the middle of the beam. The finite element method has been used with explicit time integration algorithm implemented in commercial software with one integration point brick elements. Specific properties have been observed for each test, for tensile test auxetic showed higher strength while for compression material was weaker. Logically the bending test showed no clear influence of negative Poisson to material strength. Further simulations as a shear or impact tests are planned.
Źródło:
Journal of KONES; 2010, 17, 4; 459-462
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pyramidal ceramic armor ability to defeat projectile threat by changing its trajectory
Autorzy:
Stanislawek, S.
Morka, A.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/202070.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computational mechanics
ballistic protection
composite armor
ceramics
mechanika obliczeniowa
ochrona balistyczna
kompozytowy pancerz
ceramika
Opis:
This paper presents a numerical study of a multilayer composite panel impacted by an AP (Armor Piercing) 14.5×114 mm B32 projectile. The composite consists of alternating layers of hard ceramic and a ductile aluminum alloy. While the alloy layer consists of typical plate, ceramics confront projectiles in the form of ceramic pyramids. The studied models are compared with a reference structure, which is a standard double layer panel. The problem has been solved with the usage of modeling and simulation methods as well as a finite elements method implemented in LS-DYNA software. Space discretization for each option was built with three dimensional elements ensuring satisfying accuracy of the calculations. For material behavior simulation, specific models including the influence of the strain rate and temperature changes were considered. A steel projectile and aluminum plate material were described by the Johnson-Cook model and a ceramic target by the Johnson-Holmquist model. The obtained results indicate that examined structures can be utilized as a lightweight ballistic armor in certain conditions. However, panels consisting of sets of ceramic prisms are a little easier to penetrate. Despite this fact, a ceramic layer is much less susceptible to overall destruction, making it more applicable for the armor usage. What is most important in this study is that significant projectile trajectory deviation is detected, depending on the impact point. Such an effect may be utilized in solutions, where a target is situated relatively far from an armor.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 843-849
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ uproszczeń w badaniach symulacyjnych zderzeń pocisków z tarczą na dokładność wyników
Influence of simulation simplifications on results accuracy
Autorzy:
Stanisławek, S.
Morka, A.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/209401.pdf
Data publikacji:
2013
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
mechanika komputerowa
symulacja
computational mechanics
simulation
Opis:
Artykuł omawia zagadnienie możliwości stosowania określonych uproszczeń w symulacji komputerowej. Stanowi on niezbędny warsztat dla każdego badacza stosującego opisane sposoby modelowania. Weryfikacja uproszczeń numerycznych polegała na przeprowadzeniu trzech testów zderzeniowych dla rdzenia pocisku 7,62 × 51 WC oraz czwartej symulacji polegającej na porównaniu efektów uderzenia pełnego modelu pocisku oraz jedynie jego rdzenia. Opracowane modele tarczy symulowały materiał stalowy z wprowadzonymi typowymi parametrami, natomiast pocisk był opisany modelem Johnsona-Cooka. Prędkość początkowa pocisku wynosiła 854 m/s, zaś tarcza pozostawała nieruchoma i zamocowana w płaszczyźnie prostopadłej do kierunku lotu. Opisane badania potwierdzają możliwość stosowania modelu materiału nieodkształcalnego oraz sprężystego do uproszczonego opisu ciał materialnych. Pozwala to na uproszczenie i przyspieszenie obliczeń numerycznych w sytuacjach, gdzie materiały zderzających się ciał mają znacznie różne właściwości mechaniczne. Z dużą ostrożnością powinno się odnosić do odczytywania sił rejestrowanych na ściance nieodkształcalnej. Analiza sił oraz energii pokazuje natomiast, że sabot i płaszcz pocisku nie odgrywają zasadniczej roli przy uderzeniu w nieruchomą tarczę. Doznaje ona większego popędu, jednak nie jest to różnica zasadnicza.
The paper presents the possibility of applying certain simplifications for computer simulations. It is the essential knowledge for each scientist employing the described methods of modelling. Verification of numerical simplifications consisted in conducting three impact tests for a 7.62 × 51 WC projectile core and a forth one which referred to a comparison of a full model of the penetrator with its core only. The target was described with a simple steel material while the projectile with an advanced Johnson-Cook model. Projectile initial speed was 854 m/s while a target remained motionless and fixed in a plane perpendicular to the motion direction. The performed tests confirm the possibility of using rigid and elastic materials for a simplified material body description. It allows simplification and shortening of computational time when materials are characterized by very different strength. However, a user should be very careful when analyzing the forces recorded on a rigid wall. Furthermore, analysis of the forces and energies shows that both a sabot and a jacket do not play a significant role during the impact into a motionless target. It register a bigger force impulse but it is not a substantial difference.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2013, 62, 3; 137-143
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania numeryczne mechanizmu obrotu nadwozia wagonu platformy kolejowej do przewozu samochodów ciężarowych
Numerical research of the body turning mechanism of a lorry carrying flat floor wagon
Autorzy:
Sławiński, G.
Krasoń, W.
Niezgoda, T.
Barnat, W.
Powiązania:
https://bibliotekanauki.pl/articles/215130.pdf
Data publikacji:
2011
Wydawca:
Instytut Kolejnictwa
Tematy:
obrotowa platforma kolejowa
transport kombinowany
body turning mechanism
combined transport
Opis:
Transport kombinowany, który coraz częściej zajmuje priorytetowe miejsce w krajach członkowskich Unii Europejskiej, stwarza możliwość zbudowania zrównoważonego systemu komunikacyjnego. W Europie stanowi on 10.15%, w Polsce zaledwie zaś 1,5% ogólnych przewozów kolejowych. Prognoza przewiduje, że w 2013 roku udział transportu kombinowanego w przewozach kolejowych w Polsce wzrośnie do 6%. W artykule przedstawiono analizy numeryczne płaskiej i nisko umieszczonej platformy obrotowej wagonu kolejowego służącego do transportu różnego typu pojazdów, takich jak ciągniki, ciężarówki, przyczepy, naczepy i kontenery. Wagon taki umożliwia szybki i wygodny załadunek i rozładunek pojazdów (bez urządzeń dźwigowych), samozaładunek i rozładunek bez terminali i specjalnego zabezpieczenia logistycznego, wymagany jest tylko utwardzony peron bez dodatkowej infrastruktury; każdy wagon może być załadowany - rozładowany oddzielnie.
Intermodal or combined transport, that is more and more often given priority in the EU countries, provides a possibility to construct balanced system of transport services. From all transport services transport of this type constitutes 10 - 15 pct in Europe while only 1.5 pct in Poland. According to a forecast, combined transport in Poland will reach 6 pct share in the entire rail transport in 2013. The paper presents numerical analysis of the low and flat turning floor for rail cars designed for transport of various road vehicles, such as truck-tractors, trailers, semi-trailers, and containers. Such car allows fast and convenient loading and unloading of transported vehicles (without the use of lifting equipment), self- loading and unloading with no need to use any terminals or specialized logistics. What is only needed is paved platform without any additional infrastructure. Each wagon may be loaded and unloaded individually.
Źródło:
Problemy Kolejnictwa; 2011, 153; 137-146
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Influence of the volume fraction of the carbonyl iron particles on the mechanical properties of the magnetorheological elastomers
Autorzy:
Sławiński, G.
Niezgoda, T.
Miedzińska, D.
Gieleta, R.
Powiązania:
https://bibliotekanauki.pl/articles/247437.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
smart materials
magnetorheological elastomer (MRE)
finite element method (FEM)
Opis:
Magnetorheological materials belong to the group of the so called intelligent materials. Their rheological properties can be changed in a large range using an external magnetic field. That is why they fmd ever growing application in modern technical equipment, among others in controlled dampers, clutches, sensors etc. In the paper, a numerical strength analysis of a magnetorheological material was presented. The influence of the volume fraction of carbonyl iron particles (the share of the carbonyl iron particles varied from 1.5 to 33.0 vol. %.) on the mechanical properties of the material were investigated, in particular on the Young's modulus variation. Experimental tests were carried out for specimens made of pure PU 70/30 elastomer with iron particles. They induded uniaxial compression tests. In the farmer case, specimens were in a shape of a cylinder with a diameter of 20 mm and a height of 25-30 mm. The results of experimental tests carried out in order to determine the parameters necessary to build the numerical model were induded in the paper. In the paper, an algorithm developed for determining the parameters for modelling the structure was presented. A fragment of the structure, containing several particles of iron and some quantity of elastomer, corresponding to the assumed volume fractions, was subjected to numerical analysis.
Źródło:
Journal of KONES; 2010, 17, 3; 401-406
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł

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