Fault diagnosis of rolling element bearing based on cyclic bispectrum

The vibration signals of rolling element bearings are random and cyclostationary when they are with faults.However,because of the relatively strong background noise in early fault stage,it is difficult to disclose the latent periodic components successfully even using the second order cyclostationary analysis.To overcome this difficulty,the method of central frequency spectrum of cyclic bispectrum(CBS),an alternative approach for defecting localized faults in the outer race of a rolling element bearing based on higher-order cyclic statistics analysis,was discussed.The results of simulation and experiment indicate the feasibility and validity of CBS analysis in rolling element bearing early fault diagnosis.