双排孔静压止推气体轴承的静动态特性研究  

Research on Static and Dynamic Characteristics of Hydrostatic Thrust Gas Bearing with Double Row Holes

作　　者：刘锐 吴星宇 刘鑫莲 钟良[1] LIU Rui;WU Xingyu;LIU Xinlian;ZHONG Liang(School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang 621000,Sichuan,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621000

出　　处：《机械科学与技术》2021年第8期1247-1256,共10页Mechanical Science and Technology for Aerospace Engineering

基　　金：2019年四川省大学生创新创业训练项目(S201910619059)。

摘　　要：针对双排孔供气的静压止推气体轴承,设计周向环形均压槽以提高轴承的承载力和静刚度,建立气膜模型并对其进行Fluent仿真,研究其结构参数对静态特性的影响规律。仿真结果表明:当气膜厚度h=10μm时,供气孔数n=16,孔排间距△d=25 mm,外、内径比值C=4.0,均压槽槽宽d_(1)=6 mm,槽深h_(1)=0.02 mm,节流孔孔径d_(2)=0.11 mm,孔深h_(2)=1.4 mm时能保证轴承获得较好的静特性。采用稳态与瞬态仿真结合的方法,分析承载面做谐振动时,得到不同过渡尺寸下的承载力响应曲线和对振幅的影响规律。仿真结果表明:在相同的载荷变化下,增大d_(1)、减小h_(1)、减小d_(2)、增大h_(2)均能在一定程度上抑制微振动的振幅,从而提高轴承的稳定性。In order to improve the bearing capacity and static stiffness of hydrostatic thrust gas bearing with two rows of holes,circumferential annular pressure equalizing grooves are designed in this paper.The Fluent simulation results show that when the film thickness h=10μm,the number of air supply holes n=16,the spacing between holes△d=25 mm,the ratio C=4.0,the width of equalizing groove d_(1)=6 mm,the groove depth h_(1)=0.02 mm,the orifice diameter d_(2)=0.11 mm,and the hole depth h_(2)=1.4 mm,the better static characteristics of the bearing can be guaranteed.The response curve of bearing capacity and its influence on the amplitude under different transitional dimensions are analyzed when the bearing surface is in harmonic vibration with the method of combination of steady-state and transient simulation.The simulation results show that under the same load change,increasing d1,decreasing h1,decreasing d2 and increasing h2 can restrain the amplitude of micro vibration to a certain extent,thus improving the bearing stability.

关 键 词：静压止推气体轴承 静态特性 动态特性 谐振动 稳定性 

分 类 号：TG133.35[一般工业技术—材料科学与工程]