锥形腔小孔节流空气静压支承轴承优化设计  

Design Optimization of the Aerostatic Thrust Bearing with Conical Pocketed Orifice-type Restrictor

作　　者：李一飞 尹益辉[2] LI Yi-fei;YIN Yi-hui(School of Civil and Transportation Engineering,Qinghai Nationalities University,Xining,Qinghai 810007;Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang,Sichuan 621900)

机构地区：[1]青海民族大学土木与交通工程学院,青海西宁810007 [2]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《液压与气动》2020年第3期58-64,共7页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(11572298);青海民族大学高层次人才(博士)项目(2020XJG12)

摘　　要：为了提升小孔节流空气静压支承轴承的力学性能,讨论轴承的结构参数、节流参数及供气压等设计参数对轴承力学性能的影响。针对锥形腔小孔节流空气静压轴承,首先在参数设计范围内通过数值仿真分析轴承间隙的流场,将之归结为4类,研究存在超音速区、分离泡的详细流场结构;其次基于径向基神经网络模型,建立轴承承载力、刚度、流场最大马赫数和轴承设计参数间的相关性数学模型;最后,建立优化设计数学模型,基于近似模型与流场分析结论,在轴承参数的设计范围内以刚度最优为设计目标,在给定轴承负载下获取了最优参数组合。在优化设计中消除了轴承的微振动,提升了轴承刚度,并基于优化结果进一步讨论了轴承参数对力学性能的影响。相关流场分析与优化流程的建立可为工程设计提供参考。To improve the mechanical performances of the aerostatic bearing with orifice-type restrictor,the influences of the bearing structural parameters,orifice parameters and air supply pressure on bearing performances are discussed.Aiming at the aerostatic bearing with conical pocketed orifice-type restrictor,the flow field is analyzed using the numerical simulation method with in the parameter design range,and the detailed flow characteristics of the bearing clearance with the supersonic region and separation bubble are investigated.By applying the radial basis functions model,the approximate model of the bearing load carrying capacity,stiffness and maximum Mach number in flow field represented by the bearing design parameters is established.The optimization is conducted based on the approximate model,and the maximum stiffness is obtained under the given bearing load.The bearing micro-vibration is eliminated in the optimization,the stiffness is enhanced,and the influences of bearing parameters on mechanical performances are further discussed based on the optimization results.The optimization method can provide a reference for engineering application in the aerostatic bearing design.

关 键 词：静压支承轴承 锥形腔 力学性能 优化设计 数值仿真 

分 类 号：TH138[机械工程—机械制造及自动化] TH133.36