基于行人腿部保护的保险杠吸能结构设计

Bumper energy absorption structure design based on pedestrian leg protection

建立了小腿与轿车前部的碰撞有限元模型,并运用LS-DYNA仿真求解,通过与Euro-NCAP实验结果对比,验证了有限元模型的准确性。对比分析5种截面形式的吸能板对行人的保护效果,选择了一种对行人保护效果较好的截面。为优化行人保护效果,以吸能板厚度和材料屈服强度为设计变量构造全因子实验,并拟合出腿部三项伤害指标的响应面模型。采用序列二次规划优化方法,得到对行人腿部保护较好的参数组合,为钢制吸能板的设计提供了依据。

A finite element model of collision between a car and a lower leg of a person was established and simulated with LS-DYNA.According to Euro-NCAP regulation,the model was verified with tests.A cross-section profile of a steel energy absorption panel （EAP） was selected based on a pedestrian protection performance comparison of five forms.Taking the material yield strength and the thickness of EAP as design variables,a full factorial experiment was conducted.The injury index response surface model （RSM） of a lower leg was fitted based on the test results.An optimized parameter combination was obtained by using the sequential quadratic programming method.The results provided a guidance for dsigning the structure of a steel EAP.