| 李钦,谷俊峰,李征,阮诗伦,申长雨.表面织构对气体润滑承载的作用机理和性能影响研究[J].计算力学学报,2025,42(1):1~7 |
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| 表面织构对气体润滑承载的作用机理和性能影响研究 |
| Study on the influence of performance and the mechanism of surface texture on gas lubricated loading |
| 投稿时间：2023-09-13 修订日期：2024-03-25 |
| DOI：10.7511/jslx20230913004 |
| 中文关键词: 表面织构 尺寸优化 非对称织构 承载力 气体润滑 |
| 英文关键词:surface texture size optimization asymmetric texture bearing capacity gas lubrication |
| 基金项目:国家重点研发计划(2022YFB2503503);河南重大科技专项(221100240400)资助项目. |
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| 中文摘要: |
| 气体润滑轴承由于其低摩擦、无污染、回转精度高等优点在超高速、精密仪器设备得到了日益广泛的应用,但较低的承载力严重制约了其发展和应用。表面织构设计是提升气体润滑轴承承载能力的有效途径之一,但其作用机理和影响规律尚不清晰。本文基于求解N-S方程分析了表面织构对于气体润滑承载的作用机理,并研究了表面织构尺寸参数和底部形状对于承载力的影响规律。通过数值实验发现,随着摩擦面的高速运动,当气体流过矩形织构时,由于惯性的存在,在织构处会产生非对称涡流。合理的涡流大小与位置是提升承载力的关键,且随着织构深度、壁面移动速度增加,非对称涡流在气膜发散处从无到有,再逐渐增大并向收敛处移动,承载力则先增大后减小,存在最佳设计尺寸。壁面移动速度越大、气膜厚度越小,对应的最佳织构深度越小。同时,对于织构底部形状的研究发现非对称三角形底部形状会获得更利于提升承载力的涡流,且对于固定织构最大深度,壁面移动速度越大,最优三角形底部形状的顶点越向收敛处移动,拓扑优化的形状也进一步验证了这一结果。本文的研究结果将为气体润滑性能提升与织构设计提供参考。 |
| 英文摘要: |
| 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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