Dynamic characteristics analysis of cylindrical roller bearing considering joint excitations from micro-geometry topography and marco-extended spalling

Abstract Spalling is a type of marco-failure observed in cylindrical roller bearings (CRBs). Traditionally, failure models such as rectangular or polygon shapes have been utilized to characterize the appearance and extension of spalling. However, these models often exhibit inconsistencies with real-world observations due to the simplification of the contact interface between the roller and spalling. This simplification ignores the intricate effects between the micro-geometry topography and the presence of oil film, which significantly influence the contact characteristics and dynamic behaviors of the bearing system. To settle this problem, a new dynamic model of CRB considering coupled excitations from micro-geometry topography and marco-extended spalling is established. Based on the proposed model, the investigation delves into the effects of the micro-geometry topography and marco-extended spalling on contact characteristics and dynamic behaviors. Results indicate that as the ring roughness intensifies, the oil film stiffness and damping exhibit a increasing trend. During the extension of the spalling, the micro-geometry topography of the ring introduces additional oscillations in the waveforms of acceleration, contact force, and friction force. Notably, sideband modulation and high-frequency oscillation phenomena emerges in the acceleration patterns, aligning well with the experimental results. One of the primary factors contributing to the dynamic responses of the bearing is the time-varying contact force stemming from the combination of the micro-geometry topography and marco-extended spalling.