某轿车车身+CAE+分析与设计改进汇总.pdf

某轿车车身 CAE 分析与设计改进 摘 要 随着电子科学技术的发展，有限元法（FEM）的应用越来越广泛。尤其在航 空航天、汽车、机械行业，CAE 的应用已经相当成熟和广泛。 本文针对某款自主品牌轿车车身，讨论了车身在有限元建模过程中遇到的 困难，包括命名规则、几何清理、模型简化和网格划分等等，并且提出了对应 的解决方法和措施，例如网格的划分技巧、焊点的模拟等等。在上述基础上， 利用 CAE 前处理软件建立了该车身的规范的且高质量的有限元模型。 使用有限元计算软件，对该车身进行有限元分析，计算车身的刚度。通过 对文献资料的整理，找寻归纳出了合适的车身结构刚度的计算方法。其中对于 取值点的位置及插值方法做了详细的讲解，这保证了刚度计算值的可靠性和真 实性。得到刚度值后，与合资车做竞品分析，寻找到数值的差距，然后从车身 设计的角度出发，对车身相关位置的部件进行改善，从而达到改善车身的力学 性能的目的，提升自主设计能力。 关键词：有限元法 CAE 分析 汽车 车身 刚度 CAE Analysis and Design Modification of A Certain Car Body ABSTRACT With the development of Electronic Science and Technology, the theory of finite element method (FEM) has becoming more and more mature, and widely used. CAE has been already applied widely, especially in the aerospace, automotive, machinery industry. In this article, based on a automobile body of an independent brand, the problems during the process of finite element modeling are discussed , including naming rules , geometry cleanup and simplification ，mesh control and so on. And then, some methods are given, such as how to mesh weld and complex faces. And based on above all, a more standard and high quality FE model is completed. A finite element analysis is finished using the Nastran software, which is the basis of stiffness calculation. Depending on some articles and books, a suitable method is founded about that. Detailed account is performed about interpolation method . Compared with the benchmark products, from the point of body design, we will improve the mechanical properties of body, and the independent design ability of the Chinese independent brand enterprise . Keywords : Finite Element Method , Computer- aided Engineering Analysis, Vehicle, Car Body, Rigidity