均压腔闭式止推轴承静动特性分析  

Dynamic characteristics of double-pad aerostatic bearings with pocketed orifices

作　　者：赵鹏宁[1] 杨光伟 张敏[1] 王虎 阳红[1] 刘有海[1] ZHAO Pengning;YANG Guangwei;ZHANG Min;WANG Hu;YANG Hong;LIU Youhai(Institute of Mechanical Manufacturing Technology,China Institute of Engineering Physics,Mianyang 621900,CHN;School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,CHN)

机构地区：[1]中国工程物理研究院机械制造工艺研究所,四川绵阳621900 [2]西南石油大学机电工程学院,四川成都610500

出　　处：《制造技术与机床》2021年第2期23-28,共6页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基金(51905507)。

摘　　要：在传统静压气浮轴承模型中节流小孔被简化为一个点,同时对于闭式轴承,上下两个止推轴承的耦合效应被忽略。针对这一问题,建立了包含均压腔的修正雷诺方程,在考虑闭式轴承耦合效应的基础上采用有限单元法与摄动法计算了气膜厚度、供气压力、均压腔深度对闭式轴承静动态特性的影响规律。结果表明上下轴承耦合效应对闭式轴承性能有显著影响,并且可以通过优化均压腔深度提高轴承刚度同时避免气锤自激。In the traditional static pressure air bearing model,the orifice is simplified to a single point,and for double-pad aerostatic bearings,the coupling effect of the upper and lower thrust bearings is ignored.In order to solve this problem,a modified Reynolds equation with pressure equalizing chamber is established.On the basis of considering the coupling effect of double-pad aerostatic bearings,the influence of film thickness,gas supply pressure and equalizing chamber depth on static and dynamic characteristics of double-pad aerostatic bearings is calculated by using finite element method and perturbation method.The results show that the coupling effect of the upper and lower bearings has a significant effect on the performance of the double-pad aerostatic bearings,and the bearing stiffness can be improved by optimizing the depth of the pressure equalizing cavity while avoiding air hammer self-excitation.

关 键 词：闭式止推轴承 静动态性能 刚度 阻尼 

分 类 号：TH133.35[机械工程—机械制造及自动化]