混合式气体动压轴承稳态性能研究  

Study on Steady-State Performance of Hybrid Aerodynamic Bearing

作　　者：丁博 贾晨辉[1] 史大炜 马文锁[1] DING Bo;JIA Chenhui;SHI Dawei;MA Wensuo(School of Mechatronics Engineering,Henan University of Science and Technology,Luoyang 471003,China)

机构地区：[1]河南科技大学机电工程学院,河南洛阳471003

出　　处：《轴承》2020年第10期1-6,共6页Bearing

基　　金：国家自然科学基金项目(51475142);河南省教育厅科技攻关项目(13A460251);河南省高校科技创新团队支持计划(13IRTSTHN025)。

摘　　要：建立了一种具有特殊侧面结构混合式气体动压轴承的数学模型,分别推导出周向面和侧面的雷诺方程,利用斜坐标变换和保角变换使方程精确化;提出了一种交叉耦合计算方法,将轴承侧面和周向面气膜耦合计算,采用有限差分法对轴承周向面和侧面的方程进行离散,并与SOR迭代法合理搭配,通过数值计算得出混合式气体动压轴承的稳态气膜厚度和气膜压力分布;采用复化辛普森积分法计算出量纲一的承载力,分析偏心率、转速和压缩数对轴承量纲一的承载力的影响规律。结果表明:混合式气体动压轴承的侧面特殊结构可以有效提高传统人字槽气体动压轴承的气膜压力分布和承载力,提出的交叉耦合计算方法可精确地计算出混合式气体动压轴承的稳态性能,为传统螺旋槽气体动压轴承的设计提供了新思路。A mathematical model of a hybrid aerodynamic bearing with a special side surface structure is established,the Reynolds equations of circumferential surface and side surface are derived respectively,and the equations are refined using oblique coordinate transformation and conformal transformation.A cross-coupling calculation method is proposed,the coupling of gas film on side surface and circumferential surface of the bearing is adopted.The finite difference method is used to discretize the equations of circumferential surface and side surface of the bearing,reasonably matching with SOR iterative method,to numerically calculate steady-state gas film thickness and gas film pressure distribution of the bearing.The complex Simpson integral method is used to calculate dimensionless load capacity and the effects of eccentricity,rotational speed and compression number on dimensionless load capacity are analyzed.The results show that the special side surface structure of the bearing can effectively improve gas film pressure distribution and load capacity of traditional herringbone aerodynamic bearing,the proposed cross-coupling calculation method can accurately calculate steady-state performance of hybrid aerodynamic bearing,which provide a new idea for design of traditional spiral groove aerodynamic bearing.

关 键 词：滑动轴承 气体动压轴承 润滑 数学模型 交叉耦合 稳态 承载力 气膜厚度 

分 类 号：TH133.35[机械工程—机械制造及自动化] O313.7[理学—一般力学与力学基础]