Analysis to Effect of Localized Defect Sizes on Bearing Vibration Response by Explicit Dynamic Finite Element Model

Abstract

In view of the different response of bearing system caused by the change of localized defect size on bearing outer ring, considering the shaft, pedestal and localized defect, a twodimensional (2-D) explicit dynamic Finite Element (FE) model is proposed. The results were analyzed and the FE model is verified. The effect of defect angle on simulated acceleration signals is explored in time domain and frequency domain. Utilizing the method of spline interpolation and polynomial fitting, when defect angle changes, the variation trend of the maximum of acceleration signals in time domain and the maximum of fault characteristic frequency component of acceleration in frequency domain, as well as its functional relationship are studied. Finally, this model can provide a theoretical guidance for bearing fault diagnosis based on vibration detection.