基于主断面刚度优化分配的车身正向概念设计  

Forward Conceptual Design of Car Body Using Stiffness Optimal Allocation of Main Sections

作　　者：刘子建[1] 周小龙[1] 田海豹 吕程[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《中国机械工程》2015年第6期837-843,共7页China Mechanical Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB328002);国家自然科学基金资助项目(51475152)

摘　　要：提出了基于刚度优化分配的车身正向概念设计流程。根据车身结构拓扑与刚度分布紧密关联和相互影响的特点,提出了车身刚度链设计方法。建立了基于梁单元的车身简化模型,确定了18个主断面位置,建立了以主断面为节点的车身刚度链数学模型。针对车身刚度分布问题,研究了基于车身刚度链的整体刚度优化分布方法,建立了车身弯曲刚度优化分布问题的数学模型,利用遗传算法进行了求解,确定了各主断面的材料分布。与已有近似标杆车CAE模型的刚度仿真结果进行对比,验证了该刚度优化分布方案的合理性以及车身刚度链方法的有效性。A top-down conceptual design process was proposed based on the stiffness optimum dis-tribution in car-body conceptual design phase.According to the features that the car-body structural topology was closely related to and mutually influences with stiffness distribution,a method of car-body stiffness chain was proposed.A simplified car-body wireframe model was established,18 main sections were defined and the mathematic model of car-body stiffness chain with main sections as nodes was built.Stiffness optimum distribution was studied based on car-body stiffness chain and the mathematic model of car-bodybending stiffness optimum distribution was built and then solved by ge-netic algorithm to obtain the material distribution in each main section.The rationality of stiffness op-timum distribution and the availability of car-body stiffness chain were verified by comparing with the CAE analyses of approximate benchmarking car.

关 键 词：车身概念设计 简化模型 车身刚度链 刚度优化分配 

分 类 号：U463.82[机械工程—车辆工程]