基于弹性壳体模型的波箔型气体动压径向轴承静特性分析  

Analysis of the Static Performance of Bump Foil Journal Bearings Based on Elastic Shell Model

作　　者：徐润[1] 马希直[1] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《润滑与密封》2010年第1期17-21,共5页Lubrication Engineering

基　　金：国家自然科学基金项目(50975138)

摘　　要：采用有限单元法,对波箔型气体动压径向轴承的箔片建立了弹性壳体单元模型。该模型综合考虑了箔片膜效应与弯曲效应之间的耦合,更能真实地反映出波箔和平箔的变形。运用有限差分法及Newton-Raphson迭代法耦合求解Reynolds方程和气膜厚度方程,分析了轴承气膜厚度分布、压力分布、箔片变形量分布以及承载能力,并与实验结果进行了比较,证明了该方法的可行性和精确性。分析了转速、箔片厚度对轴承特性的影响,结果表明:转速上升,承载能力增大;箔片厚度小于0.2mm时,厚度的改变对轴承的影响较大。The elastic shell element model for bump foil journal bearings was built by finite element method. The model considers the membrane stress and the plane bending stress, which reflects the deformation of bump foil and top foil more factually. Both finite difference method and Newton-Raphson method were used to solve coupled Reynolds equation and air film thickness equation. Air film thickness, pressure distribution and load carry capacity of the beatings were studied, the results were compared with the test data, which proved that this method was feasible and precise. The effect of speed and foil thickness on the foil bearing characteristics was discussed. The results show that the load carry capacity of bearings in- creases with increasing the speed. The thickness of the foil is below 0. 2 mm, the change of foil thickness has a great influence on the characteristic of bearings.

关 键 词：波箔型气体径向轴承 壳体单元 箔片变形 箔片厚度 

分 类 号：TH133.3[机械工程—机械制造及自动化]