波箔片气体动压径向轴承气膜压力分布特点

Characteristics of Film Pressure Distribution of Bump Foil Gas Bearings

考虑气体可压缩性及箔片变形等因素建立气膜厚度数学模型,采用Newton-Raphson法和有限差分法耦合求解压力控制Reynolds方程和气膜厚度方程。刚性表面轴承气膜厚度和压力分布的数值计算结果与相关文献基本吻合。在此基础上,对比了刚性表面轴承和波箔片气体动压轴承的主要区别,讨论研究了不同偏心和不同转速下气膜压力的分布特点。该数值分析方法的计算速度快、收敛性好。

Film thickness model is developed accounting for air compressibility and foil deformation. Reynolds equation and film thickness equation arc coupled through pressure and solved by Newton - Raphson Method and Finite Difference Method. The numerical results of rigid gas bearing are in agreement with relevant reference. The different performance is compared between rigid gas bearing and bump foil gas journal bearing. Furthermore, gas film thickness and pressure distribution are discussed and analyzed with different eccentricity and different speeds. Moreover, the numerical analysis method presents a quick calculativc velocity and good convergence.