A dynamic model for vibration studies of dry and lubricated deep groove ball bearings considering local defects on races

摘要

A dynamic model has been developed to predict vibration generated by healthy and defective deep groove ball bearing. The masses of shaft, raceways, ball and housing have been considered in the present model. Moreover, stiffness and damping due to non-linear Hertzian contact and lubricant film have been included in the dynamic model. The additional deflection of rolling elements in presence of local defect has been considered during simulation of defect in dynamic model. The derived equations of motions have been solved analytically using fourth order Runge-Kutta method in MATLAB software. The vibrations generated by dry and lubricated contact bearings having local defects on their races have been studied theoretically and experimentally. It has been observed that the vibration amplitude of characteristic defect frequency is affected by presence of lubricant, shaft rotational speed, radial load, defect location and its size. Good relation between theoretical and experimental results proves the effectiveness of the present model. The authors believe that the present dynamic model can be used with confidence to predict the amplitude and frequency generated by healthy and defective bearings. (C) 2019 Elsevier Ltd. All rights reserved.