Ground impact protective performances of different helmets in electric two-wheeler accidents

被引：0
|
作者：
Han Y. [1 ,2 ,3 ]
He Y. [1 ,3 ]
Lin L. [1 ,3 ]
Li Y. [1 ,3 ]
Chen Y. [4 ]
Feng H. [2 ]
机构：
[1] School of Mechanical and Automotive Engineering, Xiamen University of Technology, Xiamen
[2] Key Lab of Forensic Science, Ministry of Justice, China (Academy of Forensic Science), Shanghai
[3] Fujian Collaborative Innovation Center for R & D of Coach and Special Vehicle, Xiamen
[4] Xiamen Yu Quan Composite Technology Co., Ltd., Xiamen
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 18期
关键词：
electric two-wheeler accidents; finite element analysis; helmet protective performance; in-depth accident reconstruction; rider-to-ground collision;
D O I：
10.13465/j.cnki.jvs.2022.18.008
中图分类号：
学科分类号：
摘要：
Ground impact is one of the most important factors leading to fatal head injuries to riders in electric two-wheeler collisions. As an important head injury protection component, the helmet’s protection against rider’s head-ground impact is one of the key evaluation criteria for helmet design. Three finite element models of helmets (full helmet a and b, half helmet) were built based on real helmet geometry and combined with physical drop tests for model validation. The protection performances of three helmets against head skull fracture injury (the index is HIC) and severe brain injury (the index is PAA, HIP, MPS, CSDM0. 25, etc.) in landing impact were analyzed through the reconstruction of the three cases of electric two-wheeler accidents. The results show that in case 1, both the full helmet a and full helmet b reduce the risk of skull fracture from 100% to less than 10%; in the case of the half helmet, the impact on the brim deflectes the radially grounded foam in the impact with the ground, and makes the foam bottom out prematurely causing it to reduce the risk of skull fracture to only 98%. In case 2 and case 3, three helmets reduce the risk of skull fracture by more than 90%. In the three cases, the protection against PAA and MPS is not significant for either the full helmet a, b or the half helmet. Although the full helmet a and b protect better than the half helmet at the CSDM 0.25 predicted risk of severe brain injury, further optimization of the helmet’s protection against rotational loads is needed. The results show an important guideline for the head protection and helmet performance analysis for electric two-wheeled vehicle riders. © 2022 Chinese Vibration Engineering Society. All rights reserved.
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页码：55 / 65and93
页数：6538
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