정렬 불량을 고려한 저널베어링 마모 예측

Abstract

This study develops a transient mixed thermo-elastohydrodynamic lubrication (MTEHL) model coupled with the Archard wear model to analyze the lubrication and wear behavior of journal bearings. The proposed model incorporates variations in oil film thickness due to elastic deformation of the bearing under hydrodynamic and asperity contact pressures, thermal deformation of the shaft, wear progression on the bearing surface, and journal misalignment. We compute the hydrodynamic pressure and asperity contact pressures in the mixed lubrication regime using the Patir and Cheng average Reynolds equation and the Greenwood and Tripp asperity contact model, respectively. We evaluate the thermal response of the system, including the bearing, lubricant, and journal, using the energy equation to determine the temperature field and predict the wear distribution using the Archard wear model based on asperity contact pressure. We apply the proposed model to evaluate the performance of aligned bearings with and without wear and misaligned bearings. The results indicate that the misalignment significantly influences oil film thickness, contact pressure, and wear depth, particularly at the bearing edges. Comparison with existing literature confirms the reliability of the wear trends. This framework provides critical insights into the lubrication and wear performance of journal bearings under dynamic and misaligned conditions.