Experimental and Simulation Study on Vehicle Manned Airdrop

doi:10.12382/bgxb.2022.0331

Abstract

Abstract:

With the development of modern war mode, manned airdrop technology has attracted more and more attention. The safety protection of passengers under airdrop load is one of the core problems of manned airdrop. To this end, the vehicle manned airdrop test is carried out to test vehicle structural response and occupant injury response. The finite element models of the whole vehicle and the occupant restraint system are established, and the simulation method of the vehicle acceleration boundary applied to the occupant restraint system is used to conduct the vehicle manned airborne simulation. By combining the test and simulation results, the dynamic response characteristics of vehicle structure and the rule of occupant injury under airdrop impact are studied. To investigate the four structural parameters of touchdown speed, suspension spring stiffness, damping parameters and cushion parameters, taking the occupant’s lower tibial force, pelvic acceleration and dynamic response index (DRI) as indexes, the single factor simulation analysis and orthogonal experimental simulation analysis are carried out, and the influence laws of four structural parameters on occupant injury under airdrop impact are studied. The results show that the proposed simulation method can better reflect the vehicle’s structural response and occupant damage response under airdrop impact. Under airdrop impact, the vulnerable parts of occupants are mainly lower limbs, pelvis and lumbar spine. The lower limb damage is mainly caused by the direct impact of the floor, and the pelvis and lumbar spine damage is caused by the impact transmitted to the upper body of occupants through the body-column-seat. The effect of touchdown speed on occupant injury is the most significant. The stiffness, damping and cushion hardness of the suspension spring also affect the degree of occupant injury to some extent.

Key words: manned airdrop, occupant injury, finite element, single factor, orthogonal test

CLC Number:

TN911.7

LIU Tao, ZHANG Hongwei, SUN Xiaowang, WANG Xianhui, ZHANG Jincheng, HU Yang. Experimental and Simulation Study on Vehicle Manned Airdrop[J]. Acta Armamentarii, 2023, 44(8): 2283-2298.

Figures/Tables 30

References 24

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部位	损伤指标	试验值	损伤阈值
小腿	胫骨轴向压力/kN	1.2	<5.4^[14]
腰椎	DRI	12.4	<17.7^[15]
盆骨	盆骨垂向加速度/g	23@0ms	<23@7ms^[20]

部位	损伤指标	试验值	损伤阈值
小腿	胫骨轴向压力/kN	1.2	<5.4^[14]
腰椎	DRI	12.4	<17.7^[15]
盆骨	盆骨垂向加速度/g	23@0ms	<23@7ms^[20]

材料	密度/(g·cm^-3)	E_a/MPa	E_b/MPa	E_c/MPa	v_ba	v_ca	v_cb	G_ab/MPa	G_bc/MPa	G_cb/MPa
帘布	7.8	21125	43.2	43.2	8.5×10^-4	8.5×10^-4	0.5	14.5	11.8	11.8
橡胶	1.4	1429	22.5	22.5	6.1×10^-3	6.1×10^-3	0.5	7.6	6.0	6.0

材料	密度/(g·cm^-3)	E_a/MPa	E_b/MPa	E_c/MPa	v_ba	v_ca	v_cb	G_ab/MPa	G_bc/MPa	G_cb/MPa
帘布	7.8	21125	43.2	43.2	8.5×10^-4	8.5×10^-4	0.5	14.5	11.8	11.8
橡胶	1.4	1429	22.5	22.5	6.1×10^-3	6.1×10^-3	0.5	7.6	6.0	6.0

部位	损伤指标	试验值	仿真值	相对误差/%
小腿	胫骨轴向压力/kN	1.2	1.1	8.3
腰椎	DRI	12.4	12.0	3.2
盆骨	盆骨垂向加速度/g	16.2	14.8	9.5