转子不对中对气体箔片轴承静态性能的影响分析  

Analysis of Influence of Rotor Misalignment on Static Performance of Gas Foil Bearing

作　　者：周福平 肖曙红[1] 张岩 Zhou Fu-ping;Xiao Shu-hong;Zhang Yan(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学机电工程学院,广东广州510006

出　　处：《广东工业大学学报》2024年第5期88-96,共9页Journal of Guangdong University of Technology

基　　金：国家自然科学基金资助项目(50975051)。

摘　　要：在轴承-转子系统中,转子不对中现象时有发生,其对轴承性能具有较大影响,目前关于气体箔片轴承的研究大部分都是二维模型,无法考虑轴承的轴向变形差异,从而无法分析转子不对中现象。本文使用壳理论对气体箔片轴承进行三维建模,平箔片和波箔片采用壳单元模拟,并考虑膜效应、弯曲效应和剪切效应。箔片与平箔之间的摩擦接触则采用点线接触,并通过罚函数法计算接触力。库仑摩擦模型具有高度非线性,为了避免数值求解困难,需要对其进行规则化处理,采用增量迭代法进行求解。结果表明,该模型能够有效地对箔片轴承的性能进行模拟。当转子不对中时,箔片轴承中的气膜厚度在轴向上分布不均匀,最小气膜厚度随倾斜角的增大而减小,倾斜角几乎不影响转子偏心率,平箔片一端的变形量要远远大于另一端,这会使箔片轴承的承载能力下降,甚至造成破坏。In the bearing-rotor system,rotor misalignment occurs from time to time,which has a great impact on the bearing performance.At present,most of the studies on gas foil bearings are two-dimensional models,which cannot consider the difference in axial deformation of bearings,so it is impossible to analyze rotor misalignment..In this research,the shell theory is used to simulate the gas foil bearing,and the three-dimensional model is established.The shell element is used to model the top and bump foils,and the membrane,bending and shear effect are considered.The friction contact between bump and top foil is based on point-line contact,and the contact force is calculated by penalty function method.Due to the high nonlinearity of Coulomb friction model,in order to avoid the difficulty of numerical solution,it is regularized and solved by incremental iterative method.The results show that the model can simulate the structure of foil bearing effectively.When the rotor is not correct,the gas film thickness in the foil bearing will be distributed unevenly along the axis.The minimum film thickness decreases with the increase of the inclination Angle,and the inclination Angle almost does not affect the rotor eccentricity.The deformation of one end of the fop foil is much larger than that of the other end,which will reduce the bearing capacity of the foil,even cause damage.

关 键 词：气体箔片轴承 不对中 壳理论 增量迭代法 接触力学 

分 类 号：TH133.37[机械工程—机械制造及自动化]