基于阻抗法的矩形截面均压槽气浮支承静态性能分析  

Rectangle Section Pressure Groove on Static Performance of Aerostatic Bearings with Impedance Method

作　　者：姜庆 于普良 夏巨兴[1,2,3,4] 罗强 鲜小东 蔡田 JIANG Qing;YU Puliang;XIA Juxing;LUO Qiang;XIAN Xiaodong;CAI Tian(Key Laboratory of Metallurgical Equipment and Control Technology,Ministry of Education,Wuhan University of Science and Technology,Hubei Wuhan 430081,China;Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering,Wuhan University of Science and Technology,Hubei Wuhan 430081,China;Precision Manufacturing Institute,Wuhan University of Science and Technology,Hubei Wuhan 430081,China;The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Hubei Wuhan 430081,China)

机构地区：[1]武汉科技大学冶金装备及控制教育部重点实验室,湖北武汉430081 [2]武汉科技大学机械传动与制造工程湖北省重点实验室,湖北武汉430081 [3]武汉科技大学精密制造研究院,湖北武汉430081 [4]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《摩擦学学报》2022年第1期37-46,共10页Tribology

基　　金：国家自然科学基金项目(51705378);湖北省自然科学基金项目(2018CFB757);中国博士后基金项目(2017M622532);省部共建耐火材料与冶金国家重点实验室开放课题基金(2018QN15)资助。

摘　　要：针对CFD仿真方法效率低下的状况,提出利用阻抗法来提升气浮支承承载性能的计算速度.以矩形截面均压槽气浮支承为研究对象,研究了当均压槽高度、角度、数量、半径和供气压力变化对气浮支承承载性能的影响.结果表明:与CFD仿真方法相比,阻抗法在保证计算结果精度的前提下可提高气浮支承承载力的计算速度.当均压槽高度、角度、数量、半径和供气压力增大时,阻抗比会增加,气浮支承的承载力和刚度峰值对应的阻抗比也会增加.当气膜厚度增加时,阻抗比会增加,但承载力会相应地减小.本文作者通过阻抗法推导了气浮支承承载力简化计算公式,解决了气浮支承在均压槽方向上简化计算的难点,并为阻抗法在均压槽中的研究与应用提供了理论依据.In view of the low efficiency of CFD simulation method,and most of the existing simplified calculation methods can only simplify the two-dimensional direction of the aerostatic bearings,for the simplified calculation of the aerostatic bearings with pressure equalizing groove involves little.In order to better solve this problem,this paper proposed the impedance method to improve the calculation speed of the bearing capacity and stiffness of the aerostatic bearings.It was found that the impedance method solved the aforementioned problems.The difficulty of simplified calculation in the direction of equalizing groove made up for the deficiency of the existing simplified calculation method of aerostatic bearings.In this paper,the impedance of slot,pressure equalizing cavity,pressure equalizing slot and gas film were established respectively.Then the concept of impedance ratio was defined.Through the calculation formula,the mathematical relationship between impedance ratio and pressure of slot orifice of aerostatic bearings was established,and the mathematical relationship between impedance ratio and bearing capacity was established.The calculation formula of bearing capacity was simplified.In addition,this paper investigated the influence of the above variables and film thickness on the impedance ratio,as well as the influence of the impedance ratio on the bearing capacity and stiffness of the aerostatic bearing when the height,angle,number,radius of the equalizing groove and the gas supply pressure changed.Through the analysis of the corresponding curve results,it showed that compared to CFD simulation method,impedance method improved the calculation speed of the bearing capacity and stiffness of the aerostatic bearings under the premise of ensuring the accuracy of the calculation results,and greatly reduced the simulation consumption.When the height,angle,number,radius and gas supply pressure of equalizing groove increased,the impedance ratio,the bearing capacity of aerostatic bearings and the impedance ratio corre

关 键 词：阻抗比 均压槽 气浮支承 承载力 刚度 

分 类 号：TH117.2[机械工程—机械设计及理论]