A theoretical model to predict the vibration response of rolling bearings in a rotor bearing system to distributed defects under radial load

A theoretical model to predict the vibration response of rolling element be aring in a rotor bearing system to distributed defects under radial load ha s been developed. The rotor bearing system has been considered as a three d egrees of freedom model. The distributed defects considered are, the wavine ss of outer and inner races, and off size rolling element. The model predic ts discrete spectrum with specific frequency components for each order of w aviness. For outer race waviness, the spectrum has components at outer race defect frequency and its harmonics. In the case of inner race waviness, th e waviness orders equal to number of rolling elements and its multiples giv e rise to spectral components at inner race defect frequency and its multip les. Other orders of waviness generate sidebands at multiples of shaft freq uency about these peaks. The model predicts the amplitudes of the spectral components due to outer race waviness to be much higher as compared to thos e due to inner race waviness, rn the case of an off-size rolling element, t he model predicts discrete spectra having significant components at multipl es of cage frequency. [S0742-4787(00)00603-2].