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1
Content available Influence of internal space frame in body shell on change of its response as a result of impulse forcing
Świerczewski M., Sławiński G., Malesa P.
Journal of KONES
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2018
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Vol. 25, No. 3
453--458
EN
In order to increase the stiffness anybody chassis in Wheeled Armoured Vehicle on impact of the shock wave, the space frame part in body shell was conducted. The aim of this action is to reduce deformation and damage as a result of the detonation of the mine or an Improvised Explosive Device (IED) under the vehicle. To verify the conducted modernization, numerical calculations of the system response to a blast wave effect were carried out. The mass of the detonated explosive was increased from 6 to 20 kg of TNT. An explosive material was detonated centrally under the vehicle front part according to NATO requirements [1, 2]. The results of the calculations allowed for a deformation assessment of the floor plate and its displacement before and after modernization. A model and numerical calculations were performed using the following software: CATIA, HyperMesh, LS-PrePost, LS-Dyna. CONWEP approach was used to describe an influence of a pressure wave on the structure.
2
Content available Modelling and numerical analysis of explosion underneath the vehicle
Sławiński G., Świerczewski M., Malesa P.
Journal of KONES
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2017
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Vol. 24, No. 4
279--286
EN
The article presents a method for numerical modelling of interaction of a shock wave on a simplified model of a light armoured vehicle. Detonation of the explosive material occurs centrally underneath the vehicle. The mass of an explosive charge was from 0.5 to 10 kg off TNT. Acceleration, displacement and kinetic energy of the floor plate/panel were verified during the tests. The model and numerical calculations were carried out using the following programs: CATIA, HyperMesh, LS-PrePost, LS-Dyna. CONWEP approach was applied to describe interaction of a pressure wave on the structure. For each case, the explosive charge was located at the same place under 700 mm from the top surface of the range stand. The results of the calculations present the effects of detonation under the vehicle without a protective system and with the protective system. The proposed protection system is made of low-density materials such as aluminum foam and cork. Thanks to such an approach, the effectiveness of the protective system will be checked to reduce the adverse physical quantities that threaten the health of the soldiers. Thanks to very simple solutions, it is possible to increase passive safety of passers and use of low-density materials will slightly increase the vehicle's mass leaving manoeuvrability at a similar level.
3
Content available remote Modelling and numerical analysis of explosion under the wheel of light armoured military vehicle
Świerczewski M., Sławiński G.
Engineering Transactions
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2017
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Vol. 65, iss. 4
587--599
EN
The article presents a method for numerical modelling of a blast shock effect on unsprung parts of the military vehicle suspension. An explosive charge during the tests was placed under a vehicle wheel according to STANAG 4569 requirements. The mass of the charge is 10 kg of TNT, which corresponds to the highest level of safety – 4a. During the research, there was also tested an influence of application of Run Flat in the Tyre-Run Flat-Rim system on the propagation of a shock wave under the vehicle chassis. A model and numerical calculations were carried out with the use of the following programs: CATIA, HyperMesh, LS-PrePost, LS-Dyna. To describe an effect of a pressure wave on the structure, ALE approach was applied, which allowed mapping such processes as: detonation, wave propagation, interaction with a structure and ORFF system response.
4
Content available Numerical study of selected military vehicle chassis subjected to blast loading in terms of tire strength improving
Baranowski P., Malachowski J.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2015
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Vol. 63, nr 4
867--878
EN
In the paper a chosen model of the light armoured vehicle was tested in terms of blast loading. More precisely, the blast propagation and interaction with the tire behaviour and suspension system elements of the light-armoured vehicle (LAV) was simulated. The chosen military vehicle meets the requirements of levels 2A and 2B of STANAG 4569 standard. Based on the obtained results, two modifications were proposed for the strength and resistance improvement of the wheel. The first consisted of inserting the rubber runflat ring inside the tire, whereas in the second the honeycomb-like composite wheel was implemented. Non-linear dynamic simulations were carried out using the explicit LS-Dyna code, with multi-material Arbitrary Lagrangian-Eulerian formulation for simulation the blast process.
5
Content available remote Badania numeryczne elementu zawieszenia wykonanego z tworzywa sztucznego pojazdu ciężarowego
Przybyłek G., Smolnicki T.
Górnictwo Odkrywkowe
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2006
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R. 48, nr 7-8
103-105
PL
Głównym elementem systemu kontroli położenia osi jest zawór. Podczas poruszania się pojazdu cuiężarowego zawór ten jest poddany obciążeniom mechanicznym i termicznym. Przy projektowaniu prototypowego zaworu niezbędna jest analiza wytrzymałościowa MES.
EN
The main element of control system of axle position is a main gauge. During the heavy vehicle moving this gauge is mechanically and thermal loaded. During the designing process of prototype gauge the use of FEM strength analysis is necessary.
6
Ogólna architektura systemu semantycznej integracji geograficznych żródeł danych
Świderski M.
Studia Informatica
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2005
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Vol. 26, nr 3
29-38
PL
W artykule określone zostały wymagania, które stają przed systemem semantycznej integracji geoprzestrzennych źródeł danych w sieci Internet. Następnie przedstawiona została nowa architektura systemu, uwzględniająca relacyjno-obiektową specyfikę danych geoprzestrzennych, wykorzystująca w Schemacie Koncepcyjnym połączenie logiki deskrypcyjnej oraz Datalog, wnioskowanie w komponencie terminologicznym logiki deskrypcyjnej, zmodyfikowany algorytm przepisywania zapytań oraz dodanie opisu semantycznego do dokumentu WSDL usług Web.
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