混合型挤压膜气体轴承承载特性分析  

Analysis on Load Characteristics of Hybrid Squeeze-Film Air Bearings

作　　者：石明辉 郭红[1] 张绍林[1] 宋德红 SHI Minghui;GUO Hong;ZHANG Shaolin;SONG Dehong(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学机械与动力工程学院,郑州450001

出　　处：《轴承》2022年第10期86-92,共7页Bearing

基　　金：国家自然科学基金资助项目(52205222);中国博士后科学基金资助项目(2021M692913)。

摘　　要：针对挤压膜气体轴承悬浮力小的问题,将表面凸台引入挤压膜气体轴承,考虑表面凸台及轴承结构模态振型建立了时变及非稳态的挤压膜气体轴承运转特性分析模型,为解决凸台轴承气膜厚度分布不连续带来的求解困难问题,采用八点离散法对模型离散求解,进而开展该类轴承的承载特性分析。首先分析了光滑轴承和表面凸台轴承的气膜厚度和气压分布,然后分析了凸台参数、安装方式及运转方式对轴承承载特性的影响,结果表明:凸台的引入改变了气膜厚度的分布,提高了气膜压力峰值;悬浮力随台高、台宽、台数及驱动电压增大而增大;LOP型安装方式悬浮力大于LBP型;混合模式下的悬浮力大于纯挤压模式。Aimed at small levitation force of squeeze-film air bearings,the surface boss is introduced into the bearings,and the time-varying and unsteady operating characteristic analysis model of the bearings is established considering surface boss and modal shape of bearing structure.In order to solve the difficult problem caused by discontinuous distribution of air film thickness of boss bearings,the eight-point discrete method is used to solve the model discretely,and then the load characteristics are analyzed for this type of bearings.Firstly,the air film thickness and air pressure distribution of smooth bearings and surface boss bearings are analyzed,and then the influence of boss parameters,installation method and operating mode on load characteristics of the bearings is analyzed.The results show that:the introduction of boss changes the distribution of air film thickness and increases the peak value of air film pressure;the levitation force increases with the increase of table height,table width,number of tables and driving voltage;the levitation force of LOP type installation method is larger than that of LBP type;the suspension force under mixed mode is larger than that under pure extrusion mode.

关 键 词：滑动轴承 气体动压轴承 挤压膜气体轴承 动静压混合轴承 气膜厚度 气压 承载力 

分 类 号：TH133.31[机械工程—机械制造及自动化] O354[理学—流体力学]