不同气腔结构径向静压空气轴承性能对比  

Performance Comparison of Radial Aerostatic Bearings with Different Air Cavity Structures

作　　者：刘通 董志强[1] LIU Tong;DONG Zhiqiang(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan Shanxi 030024)

机构地区：[1]太原科技大学机械工程学院,山西太原030024

出　　处：《润滑与密封》2023年第5期103-109,共7页Lubrication Engineering

基　　金：国家自然科学基金青年科学基金项目(51106162)。

摘　　要：基于Fluent软件对单气腔和三气腔结构空气静压轴承性能进行仿真分析。借助CATIA三维软件建立静压空气轴承三维模型,利用有限体积法求解等温条件下的稳态气体润滑Reynolds方程,分析偏心率、长径比、气膜厚度、主轴转速对轴承承载性能、空气流量的影响。结果表明:偏心率较小及低供气压力下,三气腔结构的承载力优于单气腔结构;随着供气压力的增加,三气腔结构与单气腔结构的承载力差值逐渐增大,三气腔结构的承载力优于单气腔结构;随着主轴转速的增加,三气腔结构的气膜压力分布比单气腔结构更加均匀、动压效应更明显,主轴运转时稳定性能更好,承载力更高。The performance of aerostatic bearing with single and three air cavities was simulated based on Fluent software.A three-dimensional model of a aerostatic bearing was developed using the CATIA three-dimensional software.The finite volume method was used to solve the Reynolds equation of steady-state gas lubrication under isothermal conditions,and the effects of eccentricity,aspect ratio,film thickness,and spindle speed on bearing capacity and air flow of the bearings were analyzed.The results show that the bearing capacity of three-chamber air bearing is higher than that of single-chamber air bearing under the conditions of small eccentricity and low air supply pressure.With the increase of air supply pressure,the difference between the bearing capacity of the three-chamber structure and the single-chamber structure gradually increases,and the bearing capacity of the three-chamber structure is higher than that of the single-chamber structure.With the increase of the spindle speed,the gas film pressure distribution of the three-chamber structure is more uniform than that of the single-chamber structure,and the dynamic pressure effect is more obvious.The spindle with three-chamber structure has better stability and higher bearing capacity when running.

关 键 词：静压气体轴承 节流孔 承载力 气腔结构 气体润滑 

分 类 号：TH133[机械工程—机械制造及自动化]