BEARING LOCALIZED DEFECT DETECTION BY BICOHERENCE ANALYSIS OF VIBRATIONS

For automatic detection and diagnosis of localized defects in rolling element bearings, bicoherence spectra are used to derive features that signify the condition of a bearing, These features quantitatively des cribe the degree of phase correlation among any three harmonics of bea ring characteristic defect frequencies. In this paper, theory of bicoh erence is explored to establish its utilization in the detection of be aring localized defects. Experimental results show that the proposed m ethod is effective in bearing defect detection and sensitive to incipi ent defects.