Abstract: In order to ensure that the modal performance of BIW meets the requirements in the design stage, it is necessary to analyze and study BIW modal in the early stage of design. Firstly, the modal of a steel-aluminum hybrid BIW design model equipped with aluminum alloy shock absorber tower is simulated and analyzed by finite element analysis software, and then the modal of the real vehicle is analyzed and confirmed by test method. The two methods complement each other and provide effective data support for later product optimization. The results show that the accuracy of finite element analysis results is high (the results of finite element analysis are basically the same as the test results, and the error is about 2%). The powerful simulation and calculation ability of finite element analysis software simplifies a large number of tedious engineering problems, which can save a lot of development time and cost. At the same time, the results of finite element analysis are checked and corrected by test. The combination of the two methods can provide an effective solution for the design and optimization of automobile design scheme.

Key words: Steel-aluminum hybrid body-in-white; Modal; Finite element analysis; Test; Analysis and research

摘要： 为了确保白车身模态性能在设计阶段满足要求，在设计前期需要对白车身模态进行分析研 究。论文首先利用有限元分析软件对搭载铝合金减振器塔的某钢铝混合白车身设计模型的模态进 行仿真分析和摸底，再通过试验测试方法对实车的模态进行分析确认，两种方法相辅相成，为后 期的产品优化提供有效数据支撑。结果表明：有限元分析结果精度高（有限元分析结果与试验测 试结果基本相当，误差在 2%左右），有限元分析软件强大的模拟计算能力使大量繁琐的工程问题 简单化，可以节省大量的开发时间和成本；同时再结合试验测试对有限元分析结果进行校核修正， 两种方法相结合可以为汽车设计方案的设计和优化提供行之有效的解决方案。

关键词: 钢铝混合白车身；模态；有限元分析；测试；分析与研究