仿吸管吸能模块夹层发罩及其头部损伤防护效能研究

doi:10.19562/j.chinasae.qcgc.2024.12.006

Abstract

Abstract:

In order to develop a hood with better pedestrian protection performance， firstly three types of straw energy absorption modules are designed， specifically circular， triangular and rectangular. Subsequently， the CSEAM sample with PA11 material is prepared and the finite element model is verified. Then， the human body injury protection effectiveness of the three types of Novel Straw-shaped structure Sandwich Hood （NSSH） is evaluated by simulation and the deformation mode is analyzed. The results show that the three NSSHs can significantly reduce pedestrian head injury， and the Triangle Straw-shape structure Sandwich Hood （TSSH） has the best protective effectiveness on human body injury. The deformation is uniformly diffused in a regular shape， and the peak of acceleration and impact force in each stage of the collision waveform is optimized by reducing the overall structural stiffness of the hood. Further analysis shows that the human body injury protection effectiveness of TSSH decreases with the increase of vehicle speed and impact angle， and the injury caused by TSSH is significantly lower than that of the original hood， indicating that raising the hood can reduce the impact angle to better protect pedestrians， while when the Ratio of Pedestrian height to Bonnet leading edge height R_h≤2.1 and R_h≥2.45， the head only impacts the hood and windshield， respectively. It can be used as the criterion of hood lift. The research results can provide support for the design of hood structure with better pedestrian protection effectiveness.

Key words: automobile safety, hood, sandwich structure, pedestrian protection, lifting

Tiefang Zou,Dezhuo Chen,Qiqi Li. Study on Sandwich Hood Inspired by Straw-Shaped Structure and Its Protective Effectiveness on Head Injury[J].Automotive Engineering, 2024, 46(12): 2190-2199.

Figures/Tables 17

References 32

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结构名称	D₁/mm	d₁/mm	h₁/mm	t₁/mm	t₂/mm	n/层	H/mm
CSEAM	60	40	10	0.6	3.0	2.5	25
TSEAM		25
RSEAM		40

儿童θ区间/（°）	儿童仿真θ/（°）	儿童案例数	占比/%	成人θ区间/（°）	成人仿真θ/（°）	成人案例数	占比/%
0~10	10	10	20.8	0~15	15	25	25
10~20	20	6	12.5	15~25	25	17	17
20~30	30	8	16.7	25~35	35	19	19
30~40	40	17	35.4	35~45	45	17	17
40~50	50	7	14.6	45~55	55	18	18
>50		0	0	55~65	65	4	4

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Study on Sandwich Hood Inspired by Straw-Shaped Structure and Its Protective Effectiveness on Head Injury

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References 32

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