车辆减振器噪声诊断的双谱分析法

Diagnosis for the Abnormal Sound of the Vehicle Shock Absorber Based on Bispectra Analysis

噪声正常与异常的车辆减振器振动信号具有不同的高斯性和对称性特征。以双谱分析理论为基础,分析并计算了不同振动信号的选择双谱。采用选择双谱来提取振动信号的故障特征,通过马氏距离判别法来实现对车辆减振器异常噪声诊断。诊断结果与实际相符,从而验证了双谱分析法的有效性和实用性。对进一步了解减振器异响发生机理,寻求异响控制具有工程意义。

Vehicle shock absorber vibration is classified and analyzed. It shows various Gaussianity and symmetry under normal or abnormal sound. The theory of bispectra analysis is reviewed and vibration signal selected bispectra for vehicle shock absorber are plotted. A new method of fault feature extracting for shock absorber vibration based on the selected bispectra. Thus achieving the diagnosis for the abnormal sound of the vehicle shock absorber by the means of the discriminance of mahalanobis distance. The faults diagnosed accord well with the actual situation, shows that method presented is of practicality and reliability. It is useful for understanding the mechanism of shock absorber abnormal sound and for its control.