中文摘要：

提出一种压电型薄膜式差动节流阀，实现出油口压力的差动控制，并建立节流阀的数学模型，得出了流量公式。静压主轴前端采用静压轴承支撑，后端采用滚动轴承支撑，建立了静压主轴的动力学模型，且忽略静压轴承的动压效应，得到了静压轴承的油膜力以及流量公式。利用压电型薄膜式差动节流阀的差动效应，使节流阀的两个出油口分别连接静压轴承的对置油腔以期实现期望轴心轨迹，且仿真分析了期望轴心轨迹与压电陶瓷位移之间的关系，并得到了初始节流间隙与压电陶瓷位移间的关系。

英文摘要：

The piezoelectric thin film differential throttling valve which can realize the pressure of the oil outlet differential control is proposed. The mathematical model of the valve is established to obtain the flow equation. The dynamic model of the hydrostatic spindle whoese front end is supported by hydrostatic bearing and back end is supported by rolling bearing. The oil film force and flow formula of the hydrostatic bearing is obtained overlooking the hydrodynamic action of the hydrostatic bearing. In order to obtain the hydrostatic spindle axis trajectory expected, the contraposition recesses of the hydrostatic bearing are connected to the two oil outlets of the valve. The spindle axis trajectory can be controlled by controlling the piezoelectract. Finally, the relationship between the hydrostatic spindle axis trajectory expected and the displacement of the piezoelectric is simulated and the the relationship between the initial throttle clearance and the displacement of the piezoelectric is obtained.