In order to reduce adult-pedestrian head injury during vehicle-pedestrian collision, the paper aims to optimize the structure of engine hood by orthogonal experiment.In the paper, a FEM model of an adult-head form impactor colliding with an engine hood is built based on Hyper Works and LS-DYNA and its results are consistent with numerical results.Based on the FEM model, the combining effect for head injury of many main factors including the strength, tilt angle, thickness and stiffness of hood has been studied and the optimal combining level has been selected by arranging orthogonal experiment.Compared with the original model, the head injury criterion (HIC) of the optimal structure reduces 19.44% and the sensitivity of HIC is gradually increasing in the strength, tilt angle, thickness and stiffness of hood.Meanwhile, the article points out that refinement study on tilt angle of hood around 5°can further improve the pedestrian's safety to.%通过正交试验的方法优化发动机罩结构,以减小成年行人头部在车-行人碰撞中的伤害.基于Hyper Works和LS-DYNA建立了成人头型冲击器与发动机罩的碰撞有限元模型,仿真结果与数值计算结果相符.借助该有限元模型,研究了影响头部伤害的主要因素的联合作用,包括发动机罩的强度、倾斜角度、厚度和刚度,并通过正交试验挑选出了最优水平组合.与初始模型相比,最优水平组合的头部伤害指标(HIC)降低了19.44%.且HIC对发动机罩的强度、倾斜角度、厚度和刚度的灵敏性依次增加.同时,指出在发动机罩倾斜角度为5°附近做细化研究可进一步提高行人的安全性.
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