局部多孔质气浮止推轴承特性研究

Study of the Characteristics of Partial Porous Air Thrust Bearing

在考虑轴承气膜交界面处切向速度滑移的条件下,建立了局部多孔质气浮止推轴承的理论模型,然后使用有限元算法进行了数值仿真,仿真的结果与试验结果取得了一定程度的一致性,说明此新的修改了的雷诺方程可以用来作为局部多孔质气浮止推轴承研究的理论模型。利用该模型,能够成功计算出不同渗透系数、不同厚度及不同直径的局部多孔质气浮轴承的流量、承载及刚度。还从理论上与小孔类型及全多孔质类型的气浮轴承特性进行了对比,结果表明,局部多孔质气浮轴承有着优良的特性及很好的应用前景。

A nonlinear model based on the finite element method is provided to compute the static characteristics of partial porous gas thrust bearing, considering the tangential velocity slip at the bearing-film interface. Good agreement is achieved between theoretical and experimental results on static load capacity, mass flow and static stiffness. The new modified Reynolds equation is proved to be a proper model to investigate the characteristics of cxternally pressurized partial porous gas thrust bearing. With a change to the feeding parameters of permeability coefficient, height or diameter of partial porous restrictors, the effect of the steady state characteristics, such as mass rate of flow, load capacity and static stiffness are studied, Also the performance comparison among the thrust beatings with orifice restrictors, partial porous restrictors and whole porous restrictors shows that this kind of beating has promising potential in application.