Numerical Simulation and Vibration Analysis of Dynamically Loaded Bearing with Defect on Rolling Element

Abstract

The external loading on a rolling element bearing is often not of pure static nature but has a dynamic component associated with it. In the present study, the analysis of vibration response of rolling element bearing with localized defect on its rolling element subjected to external dynamic loading has been carried out. The dynamic component of external loading considered is either harmonic or random in nature. The defect-induced vibration signals have been processed with the FFT of their enveloped signal obtained from the Hilbert transform of band-passed signal around the resonant frequency band. Numerical results have been obtained for the NJ 204 bearing for different amplitude contributions of dynamic components of external load. For harmonic loading, the vibration spectra show additional spectral components through loading frequency as sidebands about each significant spectral components result due to static load. The experimental investigation confirms the presence of these additional components in the spectra. In the case of random loading, the noise level tends to rise with an increase in the value of standard deviation. The rise in noise level becomes so significant that some spectral components are masked by the noise for higher values of standard deviation.