Affiliations: [a] China Automotive Engineering Research Institute Co., Ltd., Chongqing, Chongqing, China | [b] State Key Laboratory of Intelligent Vehicle Safety Technology, Chongqing, Chongqing, China | [c] State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China | [d] School of Vehicle and Mobility, Tsinghua University, Beijing, China | [e] School of College of Mechanical and Vehicle Engineering, Chongqing University, China
Correspondence:
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Corresponding author: Chuzhao Li, China Automotive Engineering Research Institute Co., Ltd., Chongqing, Chongqing, China. E-mail: lichuzhao@126.com.
Abstract: Instinctive response was produced for protecting drivers from injury when facing incoming collisions. This study investigated the influence of instinctive response on lower extremity and knee airbag parameters. The change of posture, musculoskeletal characteristic and vehicle control parameters resulting from instinctive response were introduced in injury analysis. The key parameters of knee airbag were optimized based on a multi-object optimization algorithm of response surface method and NSGA-II. Results showed that the increased influence of musculoskeletal characteristic happened when the emergency level varied little. Injury in some cases might increase resulting from the early contact between airbag and lower extremity. It decreased in different levels after the optimization of parameters, with maximum 20%. With the increment of emergency level, the best value of ignition time in the air area, mass-velocity ratio in the brake area and all vent hole ratio increased.
