缝隙节流液体静压轴承油膜刚度系数的研究  

Research on oil film stiffness coefficient of slot throttling hydrostatic bearing

作　　者：田助新 齐思田 程春彦 鹿怀庆 TIAN Zhuxin;QI Sitian;CHENG Chunyan;LU Huaiqing(College of Mechanical and Power Engineering,China Three Gorges University,Yichang 443002,China;School of Mechanical Engineering,Yellow River Conservancy Technical Institute,Kaifeng 475004,China;State Key Laboratory of Digital Manufacturing Equipment and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]三峡大学机械与动力学院,湖北宜昌443002 [2]黄河水利职业技术学院机械工程学院,河南开封475004 [3]华中科技大学数字制造装备与技术国家重点实验室,湖北武汉430074

出　　处：《工程设计学报》2024年第5期634-640,共7页Chinese Journal of Engineering Design

基　　金：国家重点研发计划资助项目(2020YFB2007600)。

摘　　要：油膜刚度系数是液体静压轴承的关键性能参数之一。针对缝隙节流液体静压轴承,推导了其油膜承载力的解析表达式,并在此基础上进一步推导了油膜刚度系数的解析表达式。相比于传统经验公式,采用该表达式的计算结果与实验结果更吻合。通过分析应用案例可知:油膜承载力与节流参数、主轴离心率均呈正相关关系;油膜正向刚度系数随着离心率的增大而减小,油膜交叉刚度系数随着离心率的增大而增大,并且正向刚度系数明显大于交叉刚度系数。利用该轴承油膜刚度系数的表达式,可以通过测量轴承运行过程中的轴心位置,实时得到轴承油膜刚度系数,从而对缝隙节流液体静压轴承的运行进行有效监控。Oil film stiffness coefficient is one of the key performance parameters of hydrostatic bearing.In the context of slot throttling hydrostatic bearing,the analytical expression for the oil film load capacity was deduced,and the analytical expression for the oil film stiffness coefficient was further derived on this basis.Compared with conventional empirical formula,the calculated results from this expression were in better agreement with the experimental results.Through the analysis of application cases,it could be seen that the oil film load capacity was positively correlated with throttling parameters and spindle eccentricity.The positive oil film stiffness coefficient decreased with the increase of eccentricity,whereas the cross oil film stiffness coefficient increased with the increase of eccentricity,and the positive stiffness coefficient was obviously greater than the cross stiffness coefficient.By using the expression for oil film stiffness coefficient of bearing,the oil film stiffness coefficient can be obtained in real time by measuring the bearing shaft center position in the running process of the bearing,and the operation of the slot throttling hydrostatic bearing can be effectively monitored.

关 键 词：液体静压轴承 缝隙节流 油膜刚度系数 油膜承载力 轴心位置 

分 类 号：TH117[机械工程—机械设计及理论]