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Thermal analysis of lubricated three-dimensional contact bodies considering interface roughness |
Jiqiang WU1, Liqin WANG1,2, Zhen LI1, Peng LIU1, Chuanwei ZHANG1 |
1. MIIT Key Laboratory of Aerospace Bearing Technology and Equipment, Harbin Institute of Technology, Harbin 150001, China 2. State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150080, China |
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Abstract Surface roughness and thermal action are of remarkable importance in the lubrication performance of mechanical components, especially in extreme conditions. However, available studies mainly focus on the full-film lubrication conditions without considering temperature rise and real 3D surface roughness due to the complexity of surface topography and temperature characteristics. Moreover, studies on the interfacial thermal behaviors of 3D rough surface lubricated contact in an extended range of working conditions remain limited. In this paper, a deterministic mixed thermal elastohydrodynamic lubrication model considering real 3D surface roughness and thermal effects is proposed. In this model, pressure and temperature are coupled with each other, the computation of elastic deformation is accelerated through the discrete convolution and fast Fourier transform method, the temperature field is calculated with the column sweeping technique, and the semi-system method is introduced to improve convergence and numerical stability under severe conditions. The model is validated by comparing its results with available published numerical and experimental results. The thermal behaviors of the contact interface are studied in a wide range of working conditions. The influences of surface roughness and thermal effect on lubrication performance are revealed. The results show that the proposed model can be used as a powerful analysis tool for lubrication performance and temperature prediction in various heavy-load, high-speed lubricated components over a wide range of lubrication conditions.
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Keywords
thermal elastohydrodynamic lubrication
surface roughness effect
thermal effect
temperature characteristics
severe conditions
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Corresponding Author(s):
Liqin WANG
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About author: Tongcan Cui and Yizhe Hou contributed equally to this work. |
Just Accepted Date: 31 March 2022
Issue Date: 16 June 2022
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