中文摘要：

汽车碰撞是一种不连续、非线性、大变形过程，改进其结构涉及到多变量、多约束、多目标的优化。采用整车正碰过程中的关键吸能薄壁构件为研究对象，对薄壁构件的比吸能最大化，整车初始碰撞力峰值及加速度峰值最小化进行多目标优化。论文以薄壁构件的厚度为设计变量，采用均匀试验设计法安排试验，并利用逐步回归分析对仿真试验数据拟合建立高精度的代理模型，最后利用虚拟目标法对代理模型进行多目标求解。在保证汽车正碰驾驶室有足够安全空间的前提下，显著的提高了薄壁构件的比吸能及降低了初始碰撞力和加速度峰值。

英文摘要：

Automobile collision is a discrete, nonlinear, large deformation process, which involves multivariables, multi-constraint and multi-objective optimization to improve its structure. In this paper, the key energyabsorbing thin walled components are used as the research object to make multi-objective optimization for maximizing energy absorption of thin-walled component and minimizing both the peak value of vehicle initial collision force and the acceleration. In the optimization process, taking the thickness of the thin-walled components as the design variables, the uniform test design method and the and stepwise regression analysis are applied to construct the high precision agent model. And then the virtual target method is used for agent model to find the solution of multi-objective optimization. Under the premise of ensuring occupant safety space after the vehicle frontal impacting, the specific energy absorption of thin-walled components are improved significantly and the initial collision force peak value as well as acceleration peak value are reduced.