基于台架试验的悬架减振器异响辨识研究

Rig test for identifying abnormal noise of suspension shock absorber

针对某车型悬架减振器异响问题,分别进行整车道路及台架试验,获得两者的一致性规律,即减振器活塞杆加速度信号在特定频段内具有相似性。进而对减振器异响台架试验的辨识方法进行研究,提出时域峰谷差值法、分段功率谱RMS值法及基于特征能量小波分析法,并分析比较其优缺点。在此基础上提出并采用基于权重系数的聚类分析法,将单指标刚性矩形判定区域转化为多指标柔性圆形判定区域,减少评判结果因单指标误判导致最终结果误判的概率,可为大批量、不同型号减振器异响辨识及提高鉴别准确度提供参考。

For the abnormal noise problem of vehicle suspension shock absorber,vehicle road tests and rig tests were carried out.The results show the similarity between acceleration signals of the shock absorber piston rod in both tests within a certain specific frequency band.So a part of road test can be replaced by a series of rig tests for shock absorber abnormal noise identification.On the rig test,for identifying abnormal noise of shock absorber,various methods were applied,respectively：the Time Difference Method,the Subsection Auto-power RMS Value Method and the Characteristic Energy of Wavelet Analysis Method and their advantages and disadvantages were compared.On this basis,a Clustering Analysis Method Based on Weight Coefficient was proposed and implemented.The method transfers the rigid rectangular single index into more flexible circular discriminating areas and reduces the final misjudgment probability caused by single index.The method can provide a reference to the identification of different types of absorber abnormal noises and improve the judgment accuracy.