Abstract
Misalignment of roller bearings is a characteristic defect mode, which is accompanied by variations in thermal, mechanical, and lubrication performances. Regarding this aspect, a novel model considering the thermal-fluid-solid coupled effect is proposed to evaluate the performance evolution of lubricated cylindrical roller bearings (CRB) under misalignment states. The proposed model regards structural parameters, contact characteristics, and lubrication status as time-varying variables. By integrating the quasi-static model of CRB with a thermal network model, the influence of internal contact shape and stress on the thermal characteristics of misaligned bearings is reasonably considered. The accuracy of the proposed model is validated through the thermal performance experimental platform. In addition, the influence of thermal and misalignment on time-varying mechanical properties such as contact load, radial stiffness, and clearance loss is assessed. Eventually, the deterioration of the lubrication performance over operational time is quantitatively characterized by the time-varying film thickness at the load region.
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