Wyniki wyszukiwania - BazTech

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Numerical analyses of the V-shaped deflector effectiveness

Panowicz R., Konarzewski M., Trypolin M.

Journal of KONES

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2016

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Vol. 23, No. 2

269--274

EN

One of the most effective ways to protect mobile objects from the effects of the pressure wave originating from the detonation of a landmine or an explosive charge is to use a special design of the bottom of the protected vehicle. Such structure, called the deflector, in most cases has the shape of the V letter. Article presents the study of effectiveness of the V-shaped deflector. Authors prepared numerical model of a ballistic pendulum consisting of the 1 meter long HEB220 H-beam, suspended using four parallel steel ropes. In the front part of the beam, deflector was mounted. The test component was loaded with pressure wave coming from the detonation of an explosive charge. The article presents an analysis of the ability of the deflector to disperse and/or absorption of energy, depending on the type of the used explosive material and its mass. Studies have been done on the basis of numerical analysis performed with use of the finite element method with explicit integration over time scheme, implemented in the LS-Dyna software. For generation of the pressure wave originating from the detonation of explosive charge ConWep algorithm was used. It uses the predefined by the user geometric and mass parameters, and TNT equivalent to the generation of a pressure pulses.

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Ocena szybkości i efektywności obliczeń wybranych systemów komputerowych w zakresie obciążeń impulsowych

Panowicz R.

Modelowanie Inżynierskie

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2015

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T. 26, nr 57

47--53

PL

W artykule przedstawiono wyniki badań szybkości i efektywności obliczeń w zależności od liczby równocześnie prowadzonych obliczeń i liczby rdzeni na których obliczenia te są prowadzone. Rozważono typowe przypadki z zakresu dynamiki dla wybranych systemów komputerowych. Przedstawiono wyniki analiz szybkości i efektywności systemów obliczeniowych dla testu Taylora oraz obciążenia falą ciśnienia pochodzącą z detonacji materiału wybuchowego za pomocą funkcji ConWep deflektora. Przedstawiono również wyniki dla przypadku stosowanego do oceny najszybszych komputerów. W przypadku testu Taylora i obciążenia falą ciśnienia deflektora przebadano również wpływ liczby elementów na szybkość obliczeń.

EN

The paper presents the results of computation speed and efficiency based on a number of calculations performed at the same time and on a number of cores on which the calculations are carried out. Typical cases of numerical analysis of dynamic phenomena for the selected computer systems are considered. The results of speed and efficiency analyses of computing systems for the Taylor test and a blast wave interacting with the deflector is presented. The ConWep function is used to model the blast wave. The paper presents also the results for the case applied for evaluation of hi-tech computers. In the case of the Taylor test and the blast wave interacting with the structure, an influence of a number of elements on the speed of calculations is examined, too.

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Numerical analysis of the influence of the deflector stiffness and geometry on its effectiveness

Panowicz R., Konarzewski M.

Journal of KONES

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2015

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Vol. 22, No. 3

321--328

EN

The aim of the paper is to present the results of numerical analyses of designed classical system for measuring impact of the pressure wave originating from the detonation of explosive charge. In the paper, authors present classical ballistic pendulum in the form of the 1-meter length, HEB220, double T beam, which was suspended on the four parallel steel cables. On the front part of the pendulum, steel deflector was attached, whose aim was to disperse the energy. A few variants of used deflector were prepared, differing in the deflector geometry and thickness of the used material. In the next step, presented system was loaded with use of pressure wave, originating from detonation of 50 grams explosive charge. In order to properly describe the detonation process ConWep method was used. In this method, on the basis of preset geometric and mass parameters, together with TNT equivalent, the pressure pulse is determined. A three dimensional model of classical ballistic pendulum was prepared in MSC Patran software and numerical analyses were performed using LS-Dyna software. As the result of numerical analyses, the maximum deflection of the pendulum was determined for each case. Based on obtained results the influence of deflector geometry and stiffness on energy absorbing was identified and presented in the form of graphs.