Occupant secondary impact analysis and restraint system simulation optimization under small offset impact

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (3) : 35-39.

JIANG Chengyue1,2, ZHANG Wei2, REN Lihai2, HU Yuanzhi2, LI Jun2， HUANG Jie1

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Abstract

Here, vehicle occupant dynamic responses and influences of restraint system parameters were studied under 64km/h small offset impact. Restraint system models under both 50km/h full frontal impact and 64km/h small offset impact were established, and the movement posture and injury characteristics of occupant in the secondary impact under the two working conditions were compared. The simulation results showed that occupant’s upper body relative to the vehicle body has larger lateral acceleration under small offset impact to cause occupant’s head and neck damage aggravated. Based on the above damage characteristics, a side air curtain module was introduced and its effects on occupant damage were analyzed, the shape of the driver’s side airbag was optimized and its parameters were matched with the surrogate model method. CAE optimization results showed that under small offset impact, the dummy’s head HIC36 and neck Nij are reduced by 61.75% and 31.3%, respectively, and its weighted injury criteria (WIC) is reduced by47.22%.

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small offset impact / airbag design / surrogate model / restraint system optimization

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JIANG Chengyue1,2, ZHANG Wei2, REN Lihai2, HU Yuanzhi2, LI Jun2， HUANG Jie1. Occupant secondary impact analysis and restraint system simulation optimization under small offset impact[J]. Journal of Vibration and Shock, 2021, 40(3): 35-39

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