Abstract: The finite element model of car door was simplified and established by Hypermesh software. And the modal analysis on the car door was carried out to analyze the modal performance of car door. The accuracy of finite element model was verified through the experimental modal analysis. Because the first order frequency and three order frequency was close to BIW natural frequency , the modal performance need to be optimized. Through the sensitivity analysis , the key components which affected the natural frequency were found. The thickness of key components was used as the design variable , and it was optimized to improve the first order and third order natural frequency aiming at avoiding BIW natural frequency and increasing the car door modal performance.

Key words: car door, modal performance, sensitivity analysis, optimization

摘要： 在Hypermesh 软件中对某车门进行简化得到其有限元模型，并对车门进行模态分析获得车门模态性能。通过 车门模态实验分析验证有限元模型的正确性。由于车门一阶、三阶频率与白车身固有频率相近，需要优化车门模态 性能。通过灵敏度分析方法获得影响模态频率的关键部件，并以关键部件的厚度作为设计变量，经过优化提高车门 一阶、三阶固有频率，避开车身固有频率，提高车门模态性能。

关键词: 车门, 模态特性, 灵敏度分析, 优化