Cyclist head responses in electric-bicycle-to-SUV accidents based on decision tree model

doi:10.3969/j.issn.1674-8484.2021.01.004

Abstract

Abstract:

A multi-rigid body model for electric-bicycle (E-bike) -to-SUV (sports utility vehicle) impact was used to adjust the parameters to obtain the cyclist’s head kinematic responses in different accident conditions to improve the protections on the head of cyclists. Through the C4.5 decision tree algorithm, the decision tree models of cyclist’s head kinematic responses were then created from this dataset and verified accordingly. The results show that initial impact velocity of SUV is a key factor affected the cyclist head responses. Increasing the initial impact velocity of SUV increases the cyclist’s head relative impact velocity, WAD (wrap around distance) of head impact location, and head injury criterrion (HIC₁₅). And the WAD of cyclist’s head impact location is also significantly affected by the body size of cyclist. The WAD of head impact location becomes higher with increasing body size of cyclist. Therefore, the decision tree model will be used to predict and decision for guiding develop tests for cyclist’s head safety assessment regulatory and for investigating head protection.

Key words: electric-bicycle (E-bike), cyclist safety, head response, head injury, decision tree model

CLC Number:

R318.01

LI Huan, BAI Zhonghao, GAO Wenrui, CHOU Clifford C., JIANG Binhui. Cyclist head responses in electric-bicycle-to-SUV accidents based on decision tree model[J]. Journal of Automotive Safety and Energy, 2021, 12(1): 43-51.

Figures/Tables 11

References 26

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符号	描述	范围	水平
v(SUV) / (m·s^-1)	SUV碰撞初始速度	10~20	2
v(EB) / (m·s^-1)	电动自行车碰撞初始速度	2~8	2
θ/(°)	碰撞初始角度	0~90	15
Pos	碰撞初始位置	L, M, R	—
Size	骑车人体型	5^th, 50^th, 95^th	—

符号	描述	范围	水平
v(SUV) / (m·s^-1)	SUV碰撞初始速度	10~20	2
v(EB) / (m·s^-1)	电动自行车碰撞初始速度	2~8	2
θ/(°)	碰撞初始角度	0~90	15
Pos	碰撞初始位置	L, M, R	—
Size	骑车人体型	5^th, 50^th, 95^th	—

相应参数	范围	等级	说明
v_head / (m·s^-1)	25	H	高
	15~25	M	中
	< 15	L	低
WAD / mm	≥ 1 700	W	挡风玻璃
	1 250 ~ 1 700	HU	发动机罩后端
	< 1 250	HL	发动机罩前端
HIC₁₅	≥ 750	H	高
	350~750	M	中
	< 350	L	低

相应参数	范围	等级	说明
v_head / (m·s^-1)	25	H	高
	15~25	M	中
	< 15	L	低
WAD / mm	≥ 1 700	W	挡风玻璃
	1 250 ~ 1 700	HU	发动机罩后端
	< 1 250	HL	发动机罩前端
HIC₁₅	≥ 750	H	高
	350~750	M	中
	< 350	L	低

预测等级分支	序号	v_SUV / (m·s^-1）	v_EB / (m·s^-1）	θ /( °)	Pos	Size	实际等级
A1 “H”, v_head/(m·s^-1)≥ 25： v_suv/(m·s^-1) > 16, θ > 0°	1	19	8	15	R	50^th	H
	2	18	2	60	L	95^th	M
	3	17	6	45	R	5^th	H
	4	19	4	75	R	95^th	H
	5	20	2	15	L	5^th	H
A2“M”, 15 ≤ v_head/(m·s^-1)< 25： 10 < v_suv/( m·s^-1)≤ 12, θ > 0°	1	12	8	15	R	50^th	M
	2	12	6	30	M	95^th	M
	3	11	6	45	R	5^th	M
	4	11	4	90	M	5^th	M
	5	12	4	75	R	95^th	M
A3 “L”, v_head/( m·s^-1) < 15： 10 ≤ v_suv/( m·s^-1)≤ 12, θ = 0°	1	12	6	0	R	50^th	L
	2	11	2	0	M	95^th	L
	3	12	4	0	R	5^th	L
	4	10	4	0	M	5^th	L
	5	11	4	0	L	95^th	L