Localized defects detection of rolling element bearing using combination Harmonic wavelets

Combination Harmonic wavelets are demonstrated to be a class of analytic wavelet in this paper. It can also be used to the envelope-demodulation analysis of mechanical fault vibration signals, in addition to usually used complex Morlet wavelet. We use combination Harmonic wavelets to design a localized defect detector for the rolling element bearing, which integrates a comb-filter and a envelope-demodulator for a periodical amplitude-modulating vibration signals. It has been shown that this detector can effectively detect the spalling or pit defects on the races of the rolling element bearing.