| 摘要: |
| 空气静压轴承表面的均压槽结构能有效提高轴承的承载特性，但气膜内由于湍动能变化引发流场振动，形成非线性的自激涡振，影响系统的动态稳定性。为了提高空气轴承的稳定性，基于静压气体润滑理论和稀薄气体动力学基本原理，建立空气静压轴承的气膜流场数学模型；通过数值模拟和实验测试相结合，分析了直槽、环槽、复合均压槽在不同均压槽截面形状时对轴承气膜流场和气旋涡量的影响；通过时域和频域实验，明确了不同供气压力和气膜厚度下，均压槽结构对空气静压轴承自激微振动的影响规律。研究表明：均压槽结构能有效提高空气轴承的动态稳定性；环槽能有效串通弧槽和直槽之间的压力脉动，添加环槽结构后轴承微振动幅值降低37.5%；三角形截面均压槽能有效抑制气膜内气旋涡动的产生，添加三角形截面均压槽后轴承微振动幅值降低60%。 |
| 关键词: 空气轴承 均压槽 尺度效应 压力脉动 自激振动 涡动能 |
| DOI：10.13675/j.cnki.tjjs.200569 |
| 分类号:O353.1 |
| 基金项目:国家自然科学基金（51766006）；云南省科技厅面上项目（2018FB096）；云南省教育厅科学研究基金（自科类）（2021Y113）；学生课外学术科技创新基金（2020YB048）。 |
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| Effects of Pressure Groove Structure on Self-Excited Vibration of Aerostatic Bearing under Scale Effect |
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WEI Xian-jie1, LONG Wei1, REN Pu1, BI Yu-hua2
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1.Faculty of Mechanical and Electrical Engineering，Kunming University of Science and Technology，Kunming 650500，China;2.Yunnan Province Key Laboratory of Internal Combustion Engines，Kunming University of Science and Technology， Kunming 650500，China
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| Abstract: |
| The pressure groove structure on the surface of the aerostatic bearing can effectively improve the bearing characteristics， but the flow field vibration in the air film is caused by the turbulent kinetic energy change， which forms the nonlinear self-excited vortex vibration and affects the dynamic stability of the system. In order to improve the stability of aerostatic bearing， a mathematical model of air film flow field of aerostatic bearing is established based on the theory of aerostatic lubrication and the basic principle of rarefied aerodynamics. Through numerical simulation and experimental test， the effects of straight groove， ring groove and compound pressure groove structure on the flow field and vortex volume of bearing gas film under different cross section shapes are analyzed.Through experiments in time domain and frequency domain， the influence law of pressure groove structure on self-excited micro-vibration of aerostatic bearing under different air supply pressure and film thickness is clarified. The results show that the pressure groove structure can effectively improve the dynamic stability of the air bearing. The ring groove can effectively connect the pressure pulsation between the arc groove and the straight groove. After adding the ring groove structure， the bearing micro-vibration amplitude is reduced by 37.5%. The triangle section pressure groove can effectively restrain the generation of vortex in the air film， after adding the triangle section pressure groove， the bearing micro-vibration amplitude is reduced by 60%. |
| Key words: Air bearing Pressure groove structure Scale effect Pressure pulsation Self-excited vibration Vortex kinetic energy |
