考虑间隙影响的滑动轴承稳定性分析  

Stability Analysis on Sliding Bearing with Consideration of Clearance

作　　者：魏维 郭文勇[1] 吴新跃[1] 吴启豪 WEI Wei;GUO Wenyong;WU Xinyue;WU Qihao(College of Power Engineering,Naval University of Engineering,Wuhan Hubei 430033,China)

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033

出　　处：《润滑与密封》2018年第10期18-22,共5页Lubrication Engineering

基　　金：国家部委基金项目(3020401040102);国家自然科学基金项目(51705529)

摘　　要：为了进一步提升轴承的工作性能,以某型滑动轴承为研究对象,建立流体润滑的数学模型,根据压力扰动法得到轴承动态特性系数,并在此基础上求解轴承-转子系统的失稳转速;以轴承间隙为设计变量,利用MATALA进行数值仿真,分析轴承间隙对最小油膜厚度、油膜压力分布、动态特性系数以及失稳转速的影响。仿真结果表明:增大轴承间隙以及减小轴承宽度都会使得最小油膜厚度增加;油膜压力随着轴承间隙的增加而减小;增大轴承间隙会减小轴承动态特性系数的绝对值;增大轴承间隙会减小转子的失稳转速,降低系统的稳定性。In order to further enhance the performance of the bearing,the mathematical model of fluid lubrication was established with a sliding bearing as the research object.The dynamic characteristic coefficients of bearing was obtained according to pressure perturbation method,and the bearing rotor system instability speed was solved.With the bearing clearance as design variables,the influences of bearing clearance on the minimum oil film thickness,film pressure distribution,dynamic characteristic coefficient and the instability speed were analyzed through the numerical simulation of MATALA.The simulation results show that the minimum oil film thickness will increase with the increasing of bearing clearance and the decreasing of bearing width,and the oil film pressure will decrease with the increasing of bearing clearance.The absolute value of the bearing dynamic coefficients will reduce by increasing the bearing clearance,the rotor instability speed will decrease and the stability of the system will reduce by increasing bearing clearance.

关 键 词：滑动轴承 轴承间隙 动态特性 失稳转速 

分 类 号：TH133.31[机械工程—机械制造及自动化]