气体动压止推轴承性能及实验

为了研究气体动压箔片止推轴承的动力特性，建立了刚性表面气体动压止推轴承模型，采用数值计算的方法找出了不同结构参数、转速等对刚性表面气体动压止推轴承性能的影响规律。综合衡量加工难度及数值计算结果中气体动压止推轴承性能表现，加工出刚性表面气体动压止推轴承。同时选用新型弹性箔片材料完成波箔、平箔的压制及热处理工艺，设计开发了箔片动压止推轴承。搭建了单侧气体动压止推轴承实验台，重点对轴承的承载力、起飞转速、摩擦力矩等进行监测与分析。通过实验研究明确了轴承启停过程，同时发现:起飞瞬间刚性表面气体动压止推轴承与弹性表面气体动压止推轴承位移响应方向相反，且在相同轴向载荷条件下，弹性表面气体动压止推轴承起飞转速较同种结构的刚性表面气体动压止推轴承有1/2~2/3的下降。 

Performance of air-dynamic lubrication thrust bearing and experiment

To deal with the dynamic characteristics of the air-dynamic lubrication foil thrust bearing, a model of rigid-surface bearing was developed. Through numerical simulation, the effect of structural parameters and speed on performance of rigid surface air-dynamic lubrication thrust bearing were studied. Considering the manufacturing difficulties and the results of numerical simulation, a rigid-surface thrust bearing and a bump kind of aerodynamic compliant foil thrust bearing were developed. And a kind of foil metal was successfully used, the punching process and heat treatment were also accomplished. In order to measure the bearing capacity, lift-off speed, and drag torque in the on-off operation, a single-surface experiment rig was set up. It was found that different dynamic displacement responses occurred between the two kinds of bearings at the beginning of lift-off. Meanwhile, the lift-off speed of flexible surface bearing had a ratio of 1/2-2/3 advantage under the same axial load.