Research on the Gear Fault Diagnosis Using Order Envelope Spectrum

The speed-up and speed-down of the gearbox are non-stationary process and the vibration signal can not be processed by traditional processing method. In order to process the non-stationary vibration signals such as speed-up or speed-down signals effectively, the order envelope analysis technique is presented. This new method combines order tracking technique with envelope spectrum analysis. Firstly, the vibration signal is sampled at constant time increments and then uses software to resample the data at constant angle increments. Therefore, the time domain non-stationary signal is changed into angle domain stationary signal. 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 gear crack.