Synchronous enhancement of periodic transient feature based on polar diagram for bearing fault diagnosis

An automatic detection method for signal transients is proposed, which, based on the Continuous Wavelet Transform (CWT), detects finite kinds of periodic transient feature by representing and enhence the transient at certain area in the polar diagram. The proposed method is utilized in detecting the bearing inner race fault, outer race fault and rolling element fault, the transient feature caused by local fault can be detected in corresponding polar diagram, and it is rather easy to discriminate the fault according to feature distribution in the polar diagram.