Gear Fault Diagnosis Based on Order Bispectrum Analysis

Varying speed machinery condition detection and fault diagnosis are more difficult due to non-stationary machine dynamics and vibration.Therefore,most conventional signal processing method based on invariant carried out in constant time intervals are frequently unable to provide meaningful results.In order to process the non-stationary vibration signals such as speed-up or speed-down signals effectively,the order bispectrum analysis technique is presented.This new method combines order tracking technique with bispectrum 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 transient signal is transformed into angle domain stationary signal.In the end,the resample signals are processed by bispectrum analysis method.The experimental results show that order bispectrum analysis can effectively diagnosis the faults of the gear crack.