磨合磨损过程中摩擦振动变化规律研究

摘要

为了研究磨合磨损过程中摩擦振动的变化规律，实现通过摩擦振动识别摩擦副的磨合磨损状态，在CFT-Ⅰ摩擦磨损试验机上进行了船用柴油机缸套－活塞环的磨合磨损试验。应用谐波小波包变换和奇异值分解的方法提取振动信号的特征，通过定义的参数K研究了摩擦振动的变化规律。结果表明：参数K与摩擦副磨损表面的状态变化相关，随着磨合磨损的进行，参数K由大变小，并逐渐趋于稳定，与摩擦系数有一致的变化规律。因此，摩擦振动可用来描述摩擦副的磨合磨损过程，识别磨损状态的变化。%In order to study the variation rules of friction vibration in the running-in wear process and to recognize wear state through the friction vibration, the running-in wear tests of a piston ring against a cylinder from marine diesel engine were carried out on the CFT-Ⅰ tester.The characteristic of the vibration signal was extracted using the harmonic wavelet packet transform and singular value decomposition and the variation rules of friction vibration were studied by defining the characteristics parameter.It shows that the characteristic parameter is closely related to the variation of the worn surface of the friction coupling.As the running-in wear process goes on, the characteristic parameter gradually decreases and teans towards the small steady values.The variation of characteristic parameter is consistent with that of the friction coefficient.Therefore, the frictional vibration can be used to describe the running-in wear process of the friction coupling and identify the wear state.