Bump-type gas foil bearing is a special type of sliding bearing, especially suitable for supporting rotors with light loads and high speeds. In this paper, a deformation model of bump foil is established by using elastic mechanics theory. A fluid-structure interaction algorithm is proposed according to Reynolds equation of compressible gas. On this basis, a method for calculating the static and dynamic characteristics of the bump-type gas foil bearing is established considering the structure parameters of the bump foil. The presented model is validated using the data reported in the existing research. The gas film pressure distribution, gas film thickness distribution of the bearing, and the influences of bump foil structure parameters on the static and dynamic characteristics of the bearing are studied with an example. Results show that, decreasing the bump foil thickness tB or increasing the bump pitch s will increase the limiting load-carrying capacity W and decrease the attitude angle β. And increasing tB or decreasing s will decrease the friction torque Tr and increase the side leakage flow of gas Qz, resulting in less friction heat generation and faster heat dissipation. Increasing tB or decreasing s will increase the absolute values of K xx , K xy , K yx , K yy , C xx , C xy , C yx and C yy of the gas film, leading to higher equivalent stiffness of the gas film K eq .

中文翻译：

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凹凸结构参数对凹凸型气箔轴承静动态特性的影响

凸块式气箔轴承是一种特殊类型的滑动轴承，特别适用于支撑轻载、高转速的转子。本文利用弹性力学理论建立了波箔的变形模型。根据可压缩气体的雷诺方程，提出了一种流固耦合算法。在此基础上，建立了一种考虑波箔结构参数的波箔式气箔轴承静动态特性的计算方法。所提出的模型使用现有研究中报告的数据进行了验证。结合实例研究了轴承的气膜压力分布、气膜厚度分布以及凸箔结构参数对轴承静动态特性的影响。结果表明，减小凸箔厚度 tB 或增大凸块间距 s 将增加极限承载能力 W 并减小姿态角 β。增大tB或减小s会减小摩擦力矩Tr，增加气体侧漏流量Qz，摩擦生热少，散热快。增加 tB 或减少 s 将增加气膜的 K xx 、K xy 、K yx 、K yy 、C xx 、C xy 、C yx 和 C yy 的绝对值，导致气膜等效刚度 K eq 更高. 从而产生更少的摩擦生热和更快的散热。增加 tB 或减少 s 将增加气膜的 K xx 、K xy 、K yx 、K yy 、C xx 、C xy 、C yx 和 C yy 的绝对值，导致气膜等效刚度 K eq 更高. 从而产生更少的摩擦生热和更快的散热。增加 tB 或减少 s 将增加气膜的 K xx 、K xy 、K yx 、K yy 、C xx 、C xy 、C yx 和 C yy 的绝对值，导致气膜等效刚度 K eq 更高.