APPLICATION OF ORDER ENVELOPE ANALYSIS TO BEARING FAULT DIAGNOSIS

Vibration signals of rotating machinery during run-up or run-down have more important information. Therefore, run-up and run-down are of particular interest in fault diagnosis as they highlight many system defects. In order to process the non-stationary vibration signals such as run-up or run-down signals effectively, the order envelope analysis technique is presented. This method combines order tracking technique with envelope spectrum analysis. Firstly, the vibration signal is sampled at constant time increments and then is resampled at constant angle increments. Therefore, the time domain non-stationary signal is changed into angle domain stationary one. In the end, the resampled signals are processed by envelope spectrum analysis. The experimental results show that order envelope spectrum analysis can effectively diagnosis the faults of the bearing.