Asperity interaction induced vibration excitation of cylindrical roller bearings with localized defect

One of the difficulties in detecting localized faults of cylindrical roller bearings by vibration analysis is the lack of obvious early fault characteristics. To carry out the relationship between internal faults and external vibration signals is meaningful from the perspective of diagnosis. In this paper, a dynamic model of asperity interaction in the joint surface of cylindrical roller bearings is established. A new contact stiffness analysis model based on the microscopic asperity contact model is derived, which enhances the accuracy of the contact stiffness of the cylindrical roller bearing under heavy load condition. Furthermore, the vibration excitation caused by the impact and deformation of the asperity is derived. The effects of surface roughness and radial load on impact energy and vibration excitation are investigated by simulation. Experimental analysis has found that the vibration excitation of bearings is closely related to the impact energy caused by the asperity interaction behavior. The above results underscore the necessity of incorporating asperity contact considerations in the stiffness modeling of cylindrical roller bearings under heavy loads.