China Safety Science Journal ›› 2022, Vol. 32 ›› Issue (4): 72-79.doi: 10.16265/j.cnki.issn1003-3033.2022.04.011

• Safety engineering technology • Previous Articles     Next Articles

Multi-objective optimization of normally-open airbag of school buses under mixed conditions

HONG Liang1,2(), LIU Gang1, GE Ruhai1,3, LI Liang1, LI Siyuan1   

  1. 1 School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang Jiangsu 212013, China
    2 Goodbaby International Holdings Ltd., Kunshan Jiangsu 215331, China
    3 School of Automobile Engineering, Changshu Institute of Technology, Changshu Jiangsu 215500, China
  • Received:2022-01-11 Revised:2022-03-14 Online:2022-04-28 Published:2022-10-28

Abstract:

In order to improve child occupants' safety on school buses under mixed conditions, protective performance of normally-open airbag was optimized. Firstly, injury thresholds of 6-year-old and 12-year-old children were determined. Secondly, a simulation model of school buses was established and verified by sled test data, and a coupling model of school buses and normally-open airbag was built. Finally, based on different combinations of collision conditions and child ages, six mixed conditions were established. Finally, a response surface proxy model was constructed with airbag's main design parameters as optimization factors and weighted injury criterion as optimization target. The results show that according to improved NSGA-Ⅱ algorithm, the optimal configuration is upper strap length at 0.258 8 m, height of installation position at 0.385 6 m, initial pressure of exhaust at 1.199 6×105 Pa, and its opening degree at 0.98. And under mixed conditions, normally-open airbag with optimal configuration can minimize risk of injuries in child occupants.

Key words: mixed conditions, school buses, normally-open airbag, multi-objective optimization, children injury thresholds