基于TPA方法低频路噪分析与优化

Low Frequency Path Noise Analysis and Optimization Based on TPA

某纯电动汽车在粗糙路面匀速60km/h行驶过程中,车内后排乘客能感受到明显轰鸣声。通过整车声腔模态、TPA传递路径分析等试验分析,确认问题产生机理:路面激励-后副车架本体模态放大-车内声腔模态耦合。通过降低后副车架衬套硬度,整车轰鸣声得到明显改善,同时对优化后衬套进行耐久分析,最终确认为工程实施方案。

When Battery Electric Vehicles travels at a constant speed of 60km/h on rough road surface,passengers in the rear of the vehicle can feel the obvious roar.Through the analysis of vehicle acoustic cavity mode and TPA transmission path,the problem mechanism was confirmed:road excitation-rear subframe bulk mode amplification-car acoustic cavity mode coupling.By reducing the hardness of the rear subframe bushing,the roar of the whole vehicle is obviously improved.Meanwhile,the durability analysis of the optimized bushing is carried out,which is finally confirmed as the project implementation plan.