冲击载荷下动静压轴承特性变化分析  

Analysis of Hybrid Bearing Characteristics under Shock

作　　者：苗新明 郭红[1] 吴培飙 李瑞珍[1] MIAO Xinming;GUO Hong;WU Peibiao;LI Ruizhen(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou Henan 450001,China)

机构地区：[1]郑州大学机械与动力工程学院,河南郑州450001

出　　处：《润滑与密封》2024年第10期55-61,共7页Lubrication Engineering

基　　金：国家自然科学基金项目(51575498)。

摘　　要：为研究冲击载荷作用下动静压轴承特性变化,以深腔和浅腔组合的动静压轴承为研究对象,建立动态时变Reynolds方程、膜厚方程、转子动力学方程及边界条件的耦合模型。采用有限差分法和欧拉法计算冲击载荷作用下油膜压力分布等参数,并分析冲击角度、长径比及半径间隙等因素对动静压轴承轴心轨迹、承载力等参数的影响。结果表明:方向相反、幅值相等的冲击载荷使得动静压轴承承载力和轴心轨迹呈现对称变化趋势;动静压轴承长径比越大,冲击载荷下承载力峰值变化越小;半径间隙越小,冲击载荷下承载力峰值变化越小。因此降低半径间隙、提高长径比有利于提升动静压轴承的抗冲击能力。In order to study the characteristics of hydrodynamic hybrid bearings under shock load,a coupled model including dynamic time-varying Reynolds equation,film thickness equation,rotor dynamics equation,and boundary conditions was established for a hybrid bearing with deep and shallow pockets.The finite difference and Euler methods were used to calculate the hydrodynamic pressure distribution under shock load,and the influence of shock angle,length-to-diameter ratio,and radius clearance on the axis orbit and load carrying capacity was analyzed.The results reveal that the shock load with opposite directions and equal amplitudes result in symmetrical changes in the load carrying capacity and axis orbit of the hydrodynamic hybrid bearings.The larger the length-to-diameter ratio of hydrodynamic hybrid bearings,the smaller the peak change of the load carrying capacity under shock load.The smaller the radius clearance,the smaller the peak change of the load carrying capacity under shock load.These findings suggest that the bearing shock resistance can be enhanced by reducing the radial clearance and increasing the length-to-diameter ratio.

关 键 词：动静压轴承 冲击载荷 轴心轨迹 承载能力 润滑性能 

分 类 号：TH133.3[机械工程—机械制造及自动化]