Bearing damage detection method based on second order cyclic statistic

A research on the demodulation performance of second-order cyclic autocorrelation and spectral density function of the frequency modulated (FM) signals with cyclostationarity properties was done. A comprehensive analysis was made to interpret the spectrum domain slice map and the cyclic spectral domain slice map for the three-dimensional cycle spectral diagram of the original signal. Then the modulation frequency was extracted from the FM signal. Simulation and experimental studies show that the proposed method can be effectively applied to detect the early bearing failure.