基于DOE的后排座椅鞭打优化

Rear Seat Whiplash Optimization based on DOE

2021版C-NCAP中新增后排座椅的动态鞭打要求。后排座椅骨架不同于前排座椅,无法完全借鉴前排的开发经验,考虑到影响鞭打的因素众多,文章基于DOE试验方法,研究了头后间隙、头枕高度、头枕杆直径、头枕杆厚度、头枕EPP和靠背MTM等6个影响因子与鞭打得分各指标的函数关系,并给出了最优解:当头后间隙缩小至25 mm,头枕高度增高至低于头部10 mm,头枕杆直径增大至16 mm,头枕杆厚度增加至1.4 mm,增加头枕EPP,移动儿童座椅上固定点至坐垫上使得靠背MTM增大至60 mm时,鞭打得分由0.21分提升至1.48分。采用最优解方案的座椅实物鞭打得分为1.56分,与DOE最优解的得分水平相当,满足得分目标。

Dynamic whiplash requirements for rear seats are added in C-NCAP 2021.The rear seat frame is different from the front seats,so the development experience of the front seats cannot be fully used for reference.Considering that there are many factors affecting whiplash,based on the DOE test method,this paper studies the functional relationship between six influencing factors,such as the backset,the height of the head restraint,the diameter of the head restraint rod,the thickness of the head restraint rod,the EPP of the head restraint,and the MTM of the backrest,and gives the optimal solution:when the backset is reduced to 25 mm,the height of the head restraint is increased to 10 mm lower than the head,the diameter of the head restraint rod is increased to 16 mm,the thickness of the head restraint rod is increased to 1.4 mm,the EPP of the head restraint is increased,and the MTM of the backrest is increased to 60 mm by moving the up fixing point of the child seat,the whiplash score is increased from 0.21 to 1.48.The physical whiplash score of the seat using the optimal solution is 1.56,which is equivalent to the score level of the DOE optimal solution and meets the scoring goal.