气浮式低摩擦气缸的换向特性

为了研究气浮式低摩擦气缸在换向过程气浮轴承的工作状态,根据固定容腔的充放气理论并结合气浮轴承的泄漏模型对气缸的换向过程进行了建模.通过理论分析,提出以换向时间和压力损耗作为换向过程的特征量,并通过仿真研究了气缸的换向特性.结果表明,在单向阀的作用下活塞内腔在换向时具有保压作用,换向时间越短活塞内腔压力损耗越小.为进一步研究影响换向特性的其他因素,建立了可调容腔的换向测试试验台.实验结果证实了仿真所得出的结论,同时也表明这种带有单向阀的气浮轴承的设计能够实现平稳换向,不同容腔下的实验数据还能为确定气缸在应用场合中的最佳换向时机提供指导.

Commutating Characteristics of Low-Friction Cylinder Based on Air Bearing

Abstract： In order to study the working condition of the bearing in the commutation process of the air bearing based low friction cylinder, the mathematical model of the commutation was established based on the theory of charging, releasing process of fixed volume chamber and the leakage model of the air bearing. The characteristic values, the commutation time and the pressure fluctuation ratio were proposed in theoretical analysis and simulated base on Matlab. The simulation result shows that the inner chamber of the piston has a pressure keeping effect in the commutation process, and as the commutation process quickens, the pressure fluctuation ratio decreases. A test bench was set up to further study of the commutation characteristics. The experimental results confirmed the simulation result, and proved that with this design the cylinder could achieve a smooth commutation. The experiment data with different additional chamber can also provide reference for the best commutating time.