提出了基于正交小波变换检测往复式活塞发动机滑动主轴承磨损故障的一种新方法 ,利用正交小波基将机体表面测得的振动信号变换到时间 -频段域 ,选择合适的频带加以提取并进行包络谱分析 ,可实现通过机体表面振动信号监测其滑动主轴承的磨损状态。并利用有关试验说明了这种方法的有效性及使用这种方法时应注意的问题 A new method based on Orthogonal Wavelet Transform (OWC) is proposed to detect the wear of the sliding main bearing of reciprocating piston engine. The orthogonal wavelet basis is used to transform the vibration signal measured on the surface of the body to the time-frequency domain and select the appropriate frequency band to extract Envelope spectrum analysis can be achieved through the body surface vibration signal monitoring of its sliding main bearing wear status. And use the relevant experiments to illustrate the effectiveness of this method and the issues to be aware of when using this method