纯电动汽车车身泄压阀引起的低频涡声耦合问题识别分析

由于纯电动汽车底部平整，高速行驶时可能容易诱发气流与车身泄压阀耦合，从而引起车内低频噪声问题，严重降低乘坐舒适性。以某纯电动汽车高速行驶低频涡声耦合问题的测试排查分析过程为例，系统地介绍了低频涡声耦合问题的发生机理，设计了一种用于验证低频噪声问题的静置试验方法，识别出影响低频噪声的关键要素，并设计了泄压阀罩工程化方案，实车验证了方案的有效性，这对于解决纯电动汽车低频涡声耦合问题和前期开发问题识别具有借鉴和参考价值。

Analysis and identification of low frequency vortex-acoustic coupling problem caused by decompression air vent of electric vehicle

Due to the flat bottom of EV, it is easy to stimulate low-frequency sound at high speed, which seriously reduces ride comfort. In this paper, a EV decompression air vent low-frequency vortex-acoustic coupling problem at high speed as the research object, systematically introduces the low-frequency sound problem identification and screening of the solution process, based on the vortex-acoustic coupling mechanism, design a static test method is used to validate the low-frequency sound problem, identify key elements affecting low-frequency sound, the effectiveness of the scheme is verified by the vehicle subjective evaluation and objective test. This paper has important engineering guiding significance for solving the low-frequency sound problem.