叠片式箔片气体动压推力轴承的静动态特性

针对一种叠片式箔片气体动压推力轴承，提出相应的结构刚度模型。运用有限差分法(FDM)求解可压缩气体雷诺方程，并与箔片弹性变形方程耦合求解得到该类型轴承的静动态特性。结果表明:由于支承结构在径向和周向都具有变刚度特点，导致单瓣箔片上出现二次收敛楔形效应，因此形成两个压力峰值，与传统类型轴承相比能在一定程度上提高承载能力。随着最小气膜厚度的增加，轴承承载能力和摩擦力矩都不断下降,且动态刚度也逐渐下降，但对动态阻尼的影响较小。存在最优楔形高度值以实现较大承载能力的同时，也能达到较小摩擦力矩，减小功率损耗，并且还能获得较高的动态刚度和动态阻尼系数。 

Static and dynamic performance of laminated gas foil thrust bearing

Analytical model was presented for a novel laminated gas foil thrust bearing. The performance of this thrust bearing was studied by coupling the foil deformation equation and the compressible gas-lubricated Reynolds equation solved by finite difference method(FDM). Due to the variable stiffness characteristic in radial direction and circumferential direction of supported foils, the second wedging effect phenomenon and two pressure peaks were found, and the load capacity was improved compared with traditional gas foil thrust bearings. Bearing load capacity, friction torque and dynamic stiffness all declined with the decrease of minimum film thickness, but dynamic damping changed very little. There was optimum height of wedge to obtain higher load capacity and lower torque, which reduced the loss. Meanwhile, higher dynamic stiffness and higher dynamic damping can be achieved at the optimum height of wedge.