Optimal design of pre-inflatable airbag under multiple child sitting postures

doi:10.16265/j.cnki.issn1003-3033.2023.09.1937

Abstract

Abstract:

In order to improve the protection ability of pre-inflatable airbags for 6-year-old child occupants in the frontal collision of school buses, parameter analysis and design optimization were carried out. Based on the sled test, the simulation model of a school bus was built and verified. The coupling model including a pre-inflatable airbag was established. For the normal sitting posture (NP), forward-leaning sitting posture (OOP₁) and right-leaning sitting posture (OOP₂), the effects of the design parameters on the head injury criterion(HIC), thorax 3 ms resultant acceleration a_3ms were investigated. The results show that when the upper strap length increases, the volume of the airbag upper part increases and HIC decreases significantly. The middle strap length determines the outer contour of the middle and lower parts, and the installation height affects the contact position and contact moment between the child and airbag. For NP and OOP₂, when the middle strap length decreases from 0.29 m to 0.26 m, a_3ms decreases gradually. When the installation height increases, HIC also increases. Decreasing and increasing the opening pressure and degree of the deflation valve can protect the head and thorax. Taking the weighted injury criteria as the optimization target, the improved non-dominated sorting genetic algorithm II is used to optimize the main design parameters. The pre-inflatable airbag with the optimal configuration can reduce child injuries.

Key words: child occupants, sitting postures, pre-inflatable airbag, optimization design, influence characteristic, school bus frontal collision

HONG Liang, LIU Peng, LIU Gang, GE Ruhai. Optimal design of pre-inflatable airbag under multiple child sitting postures[J]. China Safety Science Journal, 2023, 33(9): 103-112.

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儿童坐姿	HIC	a_3ms/g	W
NP	320.06	28.95	0.359 8
OOP₁	137.86	31.46	0.407 1
OOP₂	250.26	27.36	0.325 3

序号	NP
序号	x₁/m	x₂/m	x₃/m	x₄/Pa	x₅
1	0.222 6	0.308 3	0.406 8	1.203 9	2.902
︙	︙	︙	︙	︙	︙
72	0.231 3	0.318 5	0.365 6	1.335 6	2.390
序号	OOP₁
序号	x₁/m	x₂/m	x₃/m	x₄/Pa	x₅
1	0.259 1	0.279 0	0.367 2	1.326 8	3.341
︙	︙	︙	︙	︙	︙
72	0.247 4	0.303 9	0.398 9	1.190 7	3.634
序号	OOP₂
序号	x₁/m	x₂/m	x₃/m	x₄/Pa	x₅
1	0.219 6	0.312 7	0.389 4	1.335 6	2.024
︙	︙	︙	︙	︙	︙
72	0.229 9	0.289 3	0.368 8	1.340 0	2.976

优化因素	初始值	最优值
x₁/m	0.235 0	0.251 4
x₂/m	0.290 0	0.260 0
x₃/m	0.395 0	0.348 2
x₄/Pa	1.250 0×10⁵	1.177 8×10⁵
x₅	1.0	4.0

坐姿类别	HIC	a_3ms/g	W
NP(原工况)	113.57	28.45	0.359 8
NP(优化前)	320.06	28.95	0.757 9
NP(优化后)	60.64	22.44	0.228 4
变化率1/%	-46.61	-21.12	-36.52
变化率2/%	-81.05	-22.49	-69.86
OOP₁(原工况)	136.74	29.03	0.407 1
OOP₁(优化前)	137.86	31.46	0.421 4
OOP₁(优化后)	21.33	24.94	0.165 5
变化率1/%	-84.40	-14.09	-59.35
变化率2/%	-84.53	-20.72	-60.73
OOP₂(原工况)	112.31	22.04	0.325 3
OOP₂(优化前)	250.26	27.36	0.616 2
OOP₂(优化后)	57.80	22.18	0.221 6
变化率1/%	-48.54	+0.64	-31.88
变化率2/%	-76.90	-18.93	-64.04