新型静压气体球轴承侧向承载特性  

Lateral carrying characteristics of new externally pressurized spherical air bearings

作　　者：王福生[1] 包钢[2] 张琳[1] 

机构地区：[1]东北林业大学机电工程学院,黑龙江哈尔滨150040 [2]哈尔滨工业大学机电工程学院,黑龙江哈尔滨150001

出　　处：《中南大学学报（自然科学版）》2015年第8期2850-2856,共7页Journal of Central South University:Science and Technology

基　　金：中央高校基本科研业务费专项资金资助项目(DL12BB34);国家高技术研究发展计划(863计划)项目(2002AA742049)~~

摘　　要：在某些应用中,静压气体球轴承同时受轴向力和侧向力的作用,研究轴承的侧向承载特性十分必要。提出一种基于计算流体动力学(CFD)、三维稳态可压缩Navier-Stokes方程的数值解法,将适用于可压缩流体的改进的SIMPLE算法应用于离散方程的求解。分析中心气膜厚度和几何参数对球轴承侧向承载特性的影响,并将数值模拟结果和实验结果进行对比。研究结果表明:采用改进的SIMPLE算法对轴承流场分析结果可以较真实地反映其侧向特性;中心气膜厚度h较大时(h>20μm),轴承侧向承载力随偏心率的增加而增加,且它们近似线性;轴承半径和球窝外包角对侧向特性影响很大,侧向刚度与半径的平方近似成正比。In some applications, externally pressurized spherical air bearing is affected by the axial force and lateral force at the same time. It is necessary to study the lateral carrying characteristics of bearings. A CFD-based analysis was performed to provide a numerical solution to the three-dimensional steady-state compressible Navier-Stokes equations, and a modified SIMPLE algorithm for compressible fluid was applied to solve the discretized governing equations. The effect of lateral carrying characteristics of spherical bearings from central air film thickness and geometric parameters was discussed. Data of numerical simulation and experiment were compared. The results indicate that the simulation data from the SIMPLE algorithm agree well with the real lateral characteristics. When the central film thickness is larger（h〉20 μm）, the lateral carrying capacity increases linearly with eccentricity ratio. The lateral carrying characteristics are largely affected by the bearing radius and exterior angle of ball socket, and lateral stiffness is proportional to square of the radius.

关 键 词：侧向承载特性 气体球轴承 数值模拟 偏心率 

分 类 号：TH133.36[机械工程—机械制造及自动化]