Abstract

Automotive frontal body structure design and optimisation are absolutely essential towards reducing the risk of pedestrian injuries in road accidents. In this paper, a two-step optimisation process in combination with the finite element method (FEM) is utilized to enhance pedestrian protection for a class-B passenger car. In this way, the finite element (FE) model of the Upper Legform Impactor has been developed and verified according to the European Commission (EC) Regulation No 631/2009. The Upper Legform to Bonnet Leading Edge test has been numerically simulated using LS-DYNA software. Material and geometry of the frontal body structure components are considered as the design variables and optimum design points are identified using the Taguchi method through a two-step framework. The Analysis of variance (ANOVA) is also used to determine the percentage effect of each controllable factors on the desired output. The obtained results revealed that in the optimum design point in comparison with the base vehicle, more than 45% improvement in the pedestrian protection criterion is observed, while selected components experienced mass reduction about 9%.

摘要

汽车前部车身结构设计和优化对于降低道路事故中行人受伤的风险是绝对必要的。在本文中，结合有限元法 (FEM) 的两步优化过程用于增强 B 级乘用车的行人保护。这样，根据欧盟委员会 (EC) 第 631/2009 号条例开发和验证了上腿形冲击器的有限元 (FE) 模型。使用 LS-DYNA 软件对上腿形到发动机罩前沿测试进行了数值模拟。正面车身结构部件的材料和几何形状被视为设计变量，并使用田口方法通过两步框架确定最佳设计点。方差分析 (ANOVA) 也用于确定每个可控因素对所需输出的百分比影响。获得的结果表明，与基础车辆相比，在最佳设计点，行人保护标准提高了 45% 以上，而选定的部件质量减少了约 9%。