中国机械工程 ›› 2015, Vol. 26 ›› Issue (6): 837-843.

• 车辆工程 • 上一篇    下一篇

基于主断面刚度优化分配的车身正向概念设计

刘子建;周小龙;田海豹;吕程   

  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
  • 出版日期:2015-03-25 发布日期:2015-03-24
  • 基金资助:
    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) 
    National Program on Key Basic Research Project (973 Program)(No. 2010CB328002)
    National Natural Science Foundation of China(No. 51475152)

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

Liu  Zijian;Zhou  Xiaolong;Tian  Haibao;Lü  Cheng   

  1. Hunan University, State Key Laboratory of Advanced Design and Manufacturing  for  Vehicle  Body,Changsha,410082
  • Online:2015-03-25 Published:2015-03-24
  • Supported by:
     
    National Program on Key Basic Research Project (973 Program)(No. 2010CB328002)
    National Natural Science Foundation of China(No. 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。

关键词: 车身概念设计, 简化模型, 车身刚度链, 刚度优化分配

Abstract:

A top-down  conceptual design process was proposed based on the stiffness optimum distribution 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 genetic algorithm to obtain the material distribution in each main section.The rationality of stiffness optimum distribution and the availability of car-body stiffness chain were verified by comparing with the CAE analyses  of  approximate benchmarking car.

Key words: conceptual design of car body;simplified model;car-body stiffness chain;stiffness , optimum , distribution

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