三瓣式气体箔片径向轴承的静动态特性

摘要/Abstract

摘要： 针对一种新型三瓣式气体箔片轴承，考虑接触界面库仑摩擦后提出了相应的刚度计算模型，并通过求解动压气体润滑Reynolds方程，计算并分析了轴承的静态特性和动态特性。研究了转速、载荷、轴承预载和轴承安装角对该轴承静动态特性的影响。静态特性方面，轴承预载可以较大程度地提高承载能力，且高转速下承载能力更强；安装角度对承载能力的影响呈正/余弦规律变化，且随着转速增大，最大承载能力所对应的安装角不断减小，并最终稳定在70°。动态方面，轴承动态直接刚度随预载增大而显著增大，阻尼变化较小；轴承动态刚度和阻尼随安装角的变化也表现为正/余弦规律，且随安装角的增大，两直接刚度和两直接阻尼分别呈异步变化趋势。

关键词: 气体箔片轴承, 静态特性, 动态特性, 轴承预载, 安装角

Abstract: A novel three-pad gas foil bearing was analyzed herein. The stiffness was modeled by considering the Coulomb's friction. The static and dynamic characteristics of the bearing were obtained by solving the Reynolds equation. The effects of rotor speed, load, pad preload and installation angle on the bearing performances were discussed. Static results indicate that the preload may increase the load capacity significantly especially at high rotor speed. The installation angle effecting on the load capacity is based on the law of sine/cosine rules. With the increasing of rotor speeds, the installation angle corresponding to the maximum load capacity decreases constantly, and stabilizes at 70° eventually. Dynamic results show that the direct stiffness increases significantly with the increasing of the pad preload. However, the damping only has slightly variation. The installation angle effecting on the stiffness and damping is also based on the law of sine/cosine rule. And two direct stiffnesses show the trend of asynchronization with the increasing of installation angles. Meanwhile, two direct dampings also vary asynchronously.

Key words: gas foil bearing, static performance, dynamic performance, preload, installation angle

中图分类号:

TH133.35

冯凯;胡小强;赵雪源;李文俊. 三瓣式气体箔片径向轴承的静动态特性[J]. 中国机械工程.

FENG Kai;HU Xiaoqiang;ZHAO Xueyuan;LI Wenjun. Static and Dynamic Performances of a Three-pad Gas Foil Journal Bearing[J]. China Mechanical Engineering.

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