表面波纹度及粗糙度对微气体轴承性能的影响  

Effect of Surface Waviness and Roughness on Performance of Micro Gas Bearing

作　　者：李祥 张小青[1] 司丽娜 田斌[1] LI Xiang;ZHANG Xiaoqing;SI Lina;TIAN Bin(School of Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China;School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]北京工商大学人工智能学院,北京100048 [2]北方工业大学机械与材料工程学院,北京100144

出　　处：《润滑与密封》2023年第4期104-111,共8页Lubrication Engineering

基　　金：北京市自然科学基金项目(3212003);国家自然科学基金项目(51775044,51605008);2022年北京工商大学研究生科研能力提升计划项目。

摘　　要：为了探究表面粗糙度、表面波纹度以及两者同时存在时对气体滑块轴承润滑性能的影响,采用分形函数表征粗糙表面,正弦曲线表征表面波纹度,代入适用于任意努森数的超薄气膜润滑Reynolds方程,得到同时考虑表面形貌特征及稀薄效应的润滑方程,并采用有限差分法进行求解。结果表明:在轴承不发生碰磨的情况下,轴承表面粗糙度值越大,气膜压力越高,轴承承载力也越高;表面波纹度的幅值、相位角、周期对轴承性能均有较大影响,相位角φ=3π/4附近、波纹周期在0.4及0.8附近时承载力较大;对于复合形貌表面,表面粗糙度可以弥补表面波纹度可能带来的气膜压力及承载力损失,轴承数越大,效果越明显;表面粗糙度对压力中心影响较小,而波纹度对压力中心的影响较大。In order to explore the influence of surface roughness,surface waviness and both on the lubrication performance of gas slider bearing,by using the fractal function to characterize the rough surface and the sinusoidal curve to characterize the surface waviness,then substituting the Reynolds equation of ultra-thin gas film lubrication suitable for any Knudsen number,the lubrication equation considering the surface morphology characteristics and thinning effect was obtained and solved by the finite difference method.The results show that in case of no contact between bearing surfaces,the greater the bearing surface roughness,the higher the gas film pressure and the higher the bearing bearing capacity.The amplitude,phase angle,and period of the waviness have a significant impact on the bearing performance.The bearing capacity is large when the phase angle is near 3π/4 and the period is near 0.4 and 0.8.For the composite rough surface,the surface roughness can make up for the possible loss of gas film pressure and bearing capacity caused by surface waviness,and the larger the bearing number,the more obvious the effect.The surface roughness has little influence on the pressure center,while the waviness has a great influence on the pressure center.

关 键 词：微气体轴承 表面粗糙度 分形函数 表面波纹度 稀薄效应 

分 类 号：TH117.2[机械工程—机械设计及理论]