小孔节流空气静压止推轴承平面跨缝试验研究  

Experimental Study on Plane Cross Joint of Air Static Thrust Bearing with Small Orifice Throttling

作　　者：王萍[1] 龙威[1] 辛晓承 高浩 王杰 WANG Ping;LONG Wei;XIN Xiaocheng;GAO Hao;WANG Jie(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Yunnan Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500

出　　处：《摩擦学学报》2023年第11期1310-1318,共9页Tribology

基　　金：云南省“万人计划/青年拔尖人才”项目(YNWR-QNBJ-2018-162);云南省基础研究计划项目(202301AS07)资助。

摘　　要：在航空航天领域的微重力模拟中,空气静压止推轴承在完成平面跨缝试验过程中由于增加了1个时变的出口边界,支撑气膜内部的流场随出口边界位置的变化而发生变化,从而影响止推轴承的静态特性和微振动特性.为了明确跨缝过程中空气静压止推轴承宏观表现出的服役特性,本文中基于静压气体润滑理论,搭建空气轴承平面跨缝的试验台,针对中心供气和三孔均布的圆盘型小孔节流空气静压止推轴承开展试验研究,分析不同供气压力、浮起高度和跨缝位置下轴承的静态特性和微振动特性.研究表明:空气轴承平面跨缝时,相当于支撑气膜增加1个时变的出口边界,因而会出现泄气现象导致承载力减小;当供气孔正对支撑台面间的拼缝时,轴承的自激微振动幅值最小;空气静压轴承在平面跨缝过程中,在相同浮起高度下,随着供气压力增大,轴承的静承载能力和静刚度都有所提高;随着负载增大,过供气孔时的微振动幅值减小.In microgravity simulations in the aerospace fields,the aerostatic thrust bearings affect the static and microvibration characteristics of the thrust bearings due to the addition of a time-varying exit boundary at the air film during the completion of the planar spanning-gap test,and the flow field inside the supporting air film varies with the change in the position of the time-varying exit boundary,thus affecting the static and micro-vibration characteristics of the thrust bearings.In order to clarify the service characteristics of aerostatic thrust bearings in the process of spanning the gap,the air film of aerostatic thrust bearings changes at any time when the change in the exit boundary of the macroperformance,this paper was based on the theory of hydrostatic gas lubrication,to build aerostatic thrust bearings planar spanning the gap of the laboratory bench,and carried out experimental research on the disc-type small-orifice throttling aerostatic thrust bearings with central air supply and three throttle orifices uniform distribution.The static and microvibration characteristics of bearings under different air supply pressures,different air film thicknesses,and different slot positions were analyzed.It was found that when the plane of the aerostatic thrust bearing spanned the gap,it was equivalent to adding a time-varying outlet boundary to the support air film.Moreover,there would be a high-pressure gas leakage phenomenon,which would lead to a reduction in the bearing capacity of the air bearing.When the throttle orifice faced the gap directly between the experimental tables,the self-excited micro-vibration amplitude of the bearing was the smallest.In the process of plane cross-seam of aerostatic bearing,under the same air film thickness,with the increase of air supply pressure,the static bearing capacity and static stiffness of the bearing were improved.With the load increasing,the micro-vibration amplitude of the air bearings with the throttle orifice directly above the splicing gap reduced.

关 键 词：空气静压止推轴承 平面跨缝 滞止区缓冲效应 静承载特性 微振动特性 

分 类 号：TH133.36[机械工程—机械制造及自动化]