某型车整车路噪轰鸣分析优化及试验研究

Vehicle Road Noise Booming Analysis Optimization and Experiment Research

某型车在研发阶段,整车在粗糙路面以50 km/h速度行驶时,右后排乘客感觉难受,表现为整车轰鸣。针对此问题,首先建立整车模型,找到主要贡献工况和区域,然后分别计算实车声腔及背门模态。结合分析结果,发现声腔模态与背门局部模态共振。对背门进行优化设计。经实车路试验证,优化后后排噪声在55 Hz降低2～3 d B(A),满足性能要求。此分析方法为同类零部件的分析提供了参考。

When a vehicle was tested at a speed of 50 km/h on a rough road, the right seat rear passenger felt uncomfortable, and the whole car was booming in the research and development phase. Firstly, the vehicle model was built, and the vehicle road noise response was calculated. At the same time, the main contribution cases and area were recognized, then the cavity and backdoor mode were calculated. According to the analysis results, the first longitudinal cavity mode was closed to the backdoor local mode, and then the backdoor structure was optimized. The noise at rear seat was reduced by 2~3 dB(A) in the road test, meeting the performance requirements. This analysis method has important technical guidance and reference value for similar problem.