Wyniki wyszukiwania - BazTech

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Simulation Research of Resistance of APC’s Wheels to Impact Loads in the Aspect of Maintaining Carrier Driving Ability

Hryciów Z., Wieczorek M.

Machine Dynamics Research

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2017

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Vol. 41, No. 4

83--96

EN

Armoured personnel carriers are exposed to the influence of various explosives devices during military missions. The element directly affected by the blast wave is a vehicle wheel. The main purpose of the work was to determine the level of damage in the vehicle tire subjected to a blast pressure wave. The research was carried out in the aspect of maintaining the mobility of the armoured personnel carriers. In the paper a construction of the analysed tire is presented in detail. A basic tire characteristics and the simulation model is described. During the tests, three explosive charges were analysed (2, 4 and 10 kg TNT). The values of blast wave pressures at characteristic points of the tire are given and the tire damage is described as well. Additionally, for a 10 kg TNT charge mass the complete armoured carrier model was analysed.

2

Numerical study on the modification effect of the seat load acting on a soldier during the blast wave derived from IED explosion

Sławiński G., Dziewulski P., Niezgoda T., Malesa P.

Journal of KONES

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2016

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Vol. 23, No. 3

465--472

EN

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.

3

Investigation of human body exposed to blast wave derived from improvised explosive devices

Sławiński G., Dziewulski P., Niezgoda T.

Journal of KONES

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2015

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Vol. 22, No. 4

287--294

EN

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.

4

Influence of armoured vehicle's bottom shape on the pressure impulse

Barnat W., Panowicz R., Niezgoda T.

Journal of KONES

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2011

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Vol. 18, No. 1

39-46

EN

This paper presents the results of a numerical analysis of military vehicles hulls mine resistance. The research concerns armours loaded with blast wave from large IED charges in three cases. First is an explosion in Euler domain without any boundary conditions. Second consists of Euler domain with flat bottom and the ground. Third is simulated Euler domain with ground and deflector. Boundary conditions used both in second and third case resulted in growth of the pressure impulse due to the reflection from a rigid obstacle. In the article different hull bottom shapes are compared. The gap between the bottom and the ground is fixed in all cases. Explosion in Euler domain without limitations is added as a reference. The blast wave caused by the detonation (simulated as a point detonation) propagated in cubic mesh with appropriate boundary conditions. Theoretical solution of spherical non-linearity is given in a form of Taylor equations. It was used to verify the numerical model. The research showed that the ground proximity affects the results of the simulation. The pressure impulse is amplified due to the wave reflection from both the bottom of the vehicle and the ground. As well as that, the study confirmed that the usage of the deflector considerably reduces the impact load to the structure.

5

Wybrane aspekty kształtowania odporności przeciwminowej terenowego pojazdu opancerzonego

Iluk A.

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

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2010

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Nr 4

109-120

PL

W artykule przedstawiono wybrane aspekty kształtowania odporności przeciwminowej pojazdów opancerzonych ze szczególnym uwzględnieniem wpływu niektórych cech na właściwości terenowe pojazdów. Przedstawione zostały mechanizmy działania poszczególnych cech konstrukcyjnych zwiększających bezpieczeństwo pojazdu i załogi. Zaprezentowane zostały przykładowe modele symulacyjne oraz wyniki symulacji ilustrujące działanie omawianych mechanizmów. Omówiono zalety i wady stosowanych układów konstrukcyjnych współczesnych samochodów minoodpornych. Przedstawione w artykule wnioski zostały praktycznie wykorzystane przy konstrukcji prototypu pojazdu minoodpornego M-ATV G10.

EN

The paper presents selected aspects of the design of off-road armoured vehicles for mineresistance. Special attention was paid to the influence of mine-resistance features on the vehicle’s ability to move off-road. The ways in which selected safety-increasing features work are presented and illustrated with some numerical examples. The advantages and disadvantages of modern mine-resistant armoured vehicles designs are discussed. The conclusions presented in the paper have been used in practice while designing the prototype of the M-ATV G-10 mine resistant armoured vehicle.