中文摘要：

在汽车概念设计阶段,调用车身关键截面特性数据库和车身真实接头数据库,根据车身总布置尺寸建立了由真实接头并辅以梁单元和大尺寸壳单元组成的车身概念模型——真实接头的车身概念模型（简称ZJ）。将ZJ中关键截面等效厚度和真实接头中的加强板厚度作为变量,通过灵敏度分析找出了对接头强度和车身扭转刚度影响最大的变量作为设计变量。利用拉丁方试验设计方法对ZJ进行样本数据设计,然后采用响应面方法构建了其扭转刚度和强度近似模型。应用连续二次规划优化方法对概念模型进行寻优,在满足车身扭转刚度和车身强度的前提下,减轻了车身的质量。

英文摘要：

In the concept phase of vehicle development,according to body key-section property database,body actual joint database and the size of body packing,a conceptual body model based onactual joints,beam element and large-size shell element was established（ZJ as an abbreviation）.The equivalent thickness of body key-sections and the thickness of the reinforcement in actual joints weretaken as variables,and then found out the most important variables to torsion stiffness and joints strength as design variables through the sensitivity analysis.Sampling points of ZJ were obtained by using Latin Hypercube experimental design method,and then built the approximate models of torsion stiffness and strength by using response surface approximate method.Using sequential quadraticprogramming method,the design variables of the body was optimized,it lightened the body weight meeting the requirements of torsion stiffness and body strength.