基于正交试验设计的薄壁结构耐撞性优化设计

Optimization for the Crashworthiness of Thin-walled Structure Based on orthogonal Design of Experiment

为了提高薄壁结构的耐撞性能,本文提出了一种高效的设计方法:。利用二次回归正交组合试验设计方案来选取设计点,在设计点处用有限元法代替传统试验来获取试验数据。然后通过最小二乘法建立了刚性墙最大位移、撞击力峰值和总质量的高精度响应面。综合考虑厚度的变化范围、安全性和轻量化要求,运用可行方向法对建立的响应面进行优化计算,得到了一组最优值。结果:表明本文的设计方法:具有很高的精度和计算效率,实现了提高薄壁结构耐撞性的目的:。同时也为车身复杂结构(如前纵梁、吸能盒等)的耐撞性设计提供理论依据和参考方法:。

In order to improve the crashworthiness of the thin-walled structure, this paper proposes a highly efficient method. Through selecting the design points according to quadratic regression orthogonal-composite Design of Experiment, this paper builds the Response Surfaces of the rigidwall＇s maximum displacement, crash peak force and total mass using least square method with these selected design points＇ data which is obtained in Finite Element Method instead of traditional experiment . Taking the range of components＇ thickness, safety and requirement of light weight into consideration, Feasible Direction Methods is applied to optimize these Response Surfaces, producing a group of optimal values. The outcome indicates that the method proposed is highly accurate and efficient, improving the crashworthiness of thin-walled structure and providing a theoretical reference and design method for more complex structures＇ crashworthiness （such as frontal longitudinal beams and crash-box, etc）.