Abstract: The acoustic cavity mode of the vehicle body is an important factor in the NVH performance design of the vehicle, and the accurate analysis of the acoustic cavity mode is of great significance to the early performance design. In this paper, the in-vehicle acoustic cavity modal modeling method is deeply studied, and the three existing acoustic cavity modeling methods are compared, and a new vehicle body acoustic cavity modal analysis method that considers the air circulation under the instrument panel is proposed. The actual modal test is carried out, and the test results verify that the new method has high accuracy.

Key words: Cavity mode; Vehicle body; Finite element analysis; Modal test

摘要： 车身声腔模态是整车 NVH 性能设计的重要因素，声腔模态的准确分析对前期性能设计具 有重要意义。文章对车内声腔模态的建模方法进行了深入研究，对现有三种声腔建模方法进行对 比，提出了一种新的考虑仪表台下部空气流通的车身声腔模态分析方法，并通过模态试验进行了 实际测试，试验结果验证新方法具有较高准确性。

关键词: 声腔模态；车身；有限元分析；模态试验