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| Study on the influence of performance and the mechanism of surface texture on gas lubricated loading |
| Received:September 13, 2023 Revised:March 25, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20230913004 |
| KeyWord:surface texture size optimization asymmetric texture bearing capacity gas lubrication |
| Author | Institution |
| 李钦 |
大连理工大学 工程力学系, 大连 |
| 谷俊峰 |
大连理工大学 工程力学系, 大连 |
| 李征 |
大连理工大学 工程力学系, 大连 |
| 阮诗伦 |
大连理工大学 工程力学系, 大连 ;大连理工大学 工业装备结构分析优化与CAE软件全国重点实验室, 大连 |
| 申长雨 |
大连理工大学 工程力学系, 大连 ;大连理工大学 工业装备结构分析优化与CAE软件全国重点实验室, 大连 |
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| Abstract: |
| Gas lubricated bearings have been increasingly widely used in ultra-high speed and precision instruments and equipment due to their advantages of low friction,no pollution,and high rotational accuracy.However,their low bearing capacity seriously restricts their development and application.One of the effective ways to improve the load-bearing capacity of gas lubricated bearings is through surface texture design,but its mechanism and influence law are still unclear.This article analyzes the mechanism of surface texture on gas lubricated bearings based on solving the N-S equation,and studies the influence of surface texture size parameters and bottom shape on bearing capacity.Through numerical experiments,it is found that with the high-speed motion of the friction surface,when gas flows through a rectangular texture,asymmetric eddy current will be generated at the texture due to the presence of inertia.Reasonable eddy current size and position are key to improving bearing capacity,and as the texture depth and wall movement speed increase,asymmetric eddy currents start from scratch at the divergence of the air film,gradually increase and move towards the convergence point.The bearing capacity first increases and then decreases,and there is an optimal design size.The higher the wall movement speed and the smaller the gas film thickness,the smaller the corresponding optimal texture depth.Additionally,research on the shape of the bottom of the texture has found that an asymmetric triangular bottom shape can obtain eddy currents that are more conducive to improving bearing capacity.For a fixed maximum depth of the texture,the higher the wall movement speed,the more the vertex of the optimal triangular bottom shape moves towards the convergence point.The topology optimized shape further confirms this result.The research results of this article will provide reference for improving gas lubrication performance and texture design for bearings. |
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