氦气-空气混合环境中微型螺旋槽止推气浮轴承的承载特性分析  

Analysis on the Bearing Characteristics of Gas-Lubricated Spiral-Groove Thrust Micro-Bearings in Helium-Air Gas Mixtures

作　　者：张传伟[1] 葛泉江 解志杰[1] 王黎钦[1,3] 孙涛[1] 马欣新[1] 古乐[1] ZHANG Chuanwei;GE Quanjiang;XIE Zhijie;WANG Liqin;SUN Tao;MA Xinxin;GU Le(MIIT Key Laboratory of Aerospace Bearing Technology and Equipment, Harbin Institute of Technology, Heilongjiang Harbin 150001, China;State Key Laboratory of Robotics and System, Harbin Institute of Technology, Heilongiiang Harbin 150080, China;AECC Harbin Bearing Corporation Ltd, Heilong]iang Harbin 150025, China)

机构地区：[1]哈尔滨工业大学航空航天轴承技术及装备工信部重点实验室,黑龙江哈尔滨150001 [2]中国航发哈尔滨轴承有限公司,黑龙江哈尔滨150025 [3]哈尔滨工业大学机器人技术与系统国家重点实验室,黑龙江哈尔滨150080

出　　处：《摩擦学学报》2018年第2期213-219,共7页Tribology

基　　金：国家自然科学基金项目(51605113;U1537214);中国博士后科学基金项目(2016M591523)资助~~

摘　　要：针对氦气-空气混合气体环境,分析了不同氦气体积含量下混合气体的黏度和分子平均自由程,利用有限单元法求解雷诺方程二阶滑移修正模型,计算了微型螺旋槽气浮轴承的气压和气膜厚度,研究了氦气体积含量、螺旋槽深度和转速对气浮轴承承载能力的影响.分析结果表明:当螺旋槽深度由1μm增至10μm时,气浮轴承的气膜厚度先增加后减小,槽深为5μm时,气膜厚度最大,气浮轴承的承载能力最佳.此外,当槽深小于5μm时,混合气体的分子平均自由程对气膜厚度的影响较大;当槽深大于5μm时,混合气体黏度的影响起主导作用.The mean free path and the viscosity of helium-air gas mixtures were calculated as a function of the helium fraction. The second-order-slip modified Reynolds equation was solved using the finite element method. The hydrodynamic pressure and film thickness of the micro-bearing were obtained. The effects of helium fraction, groove depth and angular velocity on the bearing characteristics of the micro-bearing were investigated. The results show that when the groove depth increased from 1 ~tm to 10 ~tm, the film thickness of the micro-bearing firstly increased and then decreased, reaching a maximum at the groove depth of 5 μm, which represented an optimum bearing capacity. In addition, at a groove depth less than 5 μm, the mean free path of the gas mixtures had a dominant effect on the film thickness of the micro-bearing. However, when the groove depth was larger than 5 μm, the effect of the gas viscosity dominated.

关 键 词：微型螺旋槽止推气浮轴承 氦气-空气混合气体 分子平均自由程 气体黏度 气膜厚度 

分 类 号：TH117.2[机械工程—机械设计及理论]