嵌入控制油腔的静压滑动轴承可控性研究

针对主动控制静压轴承转子运动的可控性和稳定性有待提高的问题，提出了一种在传统静压轴承的油腔内嵌入控制油腔的轴承结构，并采用主动单面薄膜节流器对其供油，充分利用轴承内部的二次节流，以此提高静压轴承的主动控制性能.基于雷诺润滑方程和流量守恒方程，采用有限差分法和欧拉迭代法建立了静压主轴的轴心运动计算模型，研究了不同轴承结构和进油压力下轴承的动态特性和控制特性.结果表明:当控制腔面积占比在30%，封油边宽度为5 mm时，静压轴承同时具有良好的动态特性和控制特性.通过合适的结构设计，嵌入控制油腔的轴承结构可以提高静压主轴轴心运动的可控性. 

Research on Controllability of Active Hydrostatic Journal Bearing with Pressure Control Cavity

To improve the controllability and stability of the active hydrostatic spindle,a smaller control-cavitywas nested in each oil cavity of the traditional hydrostatic bearing, and the active single-side membrane restrictor was used to supply oil to it.The two-time throttling inside the bearing was fully utilized to realize excellent controll ability of hydrostatic bearing. Based on the Reynolds lubrication equation and the flow conservation equation, the dynamic axis orbit model of the hydrostatic spindle was established by the finite difference method and the Euler iteration method and the dynamic characteristics and control characteristics of the bearing under different bearing structures and oil supply pressures were theoretically studied. The results indicate that the hydrostatic bearing has both better dynamic characteristics and control characteristics while the width of the bearing land is 5 mm and the area ratio of the control-cavity is 30%.The well-designed hydrostatic bearing nested with control-cavity can improve the controll ability of hydrostatic spindle movement.