轴承-转子系统运动分析及主轴振动的相位控制

为限制高速运动过程中轴承转子系统的振动及提高机床加工精度，提出了通过控制可倾瓦轴承转子的振幅和相位以降低主轴前端振幅来达到提高加工精度的方法.建立了刚性轴转子系统的五自由度振动模型，并求出了转子系统振动的微分方程；通过流量平衡法求得可倾瓦轴承的供油流量，并离散雷诺方程求出了可倾瓦轴承的油膜力；通过欧拉法得出了可倾瓦轴承转子轨迹，并通过空间直线方程得出了主轴前端转子运动轨迹；通过电磁致动器作为辅助控制装置调节可倾瓦轴承转子的切向加速度和法向加速度.算例的仿真结果显示可倾瓦轴承转子的轨迹收敛成圆形，并减小了前后轴承的相位差，主轴前端振幅降低了60.26%. 

Motion Analysis of Bearing Rotor System and Phase Control of Spindle Vibration

In order to limit the vibration of the shaft bearing subsystem and improve the machining accuracy of machine tool in the high-speed movement, a method was proposed based on controlling the amplitude and phase of the rotor of the tilting pad bearing to reduce the amplitude in the front end of the spindle. Firstly, a five-degree-freedom vibration model was established for the rigid rotor system and a differential equation was conducted to solve rotor system vibration. Then,a flow balance method was used to obtain the feed flux, a discrete Renault equation was taken to analyze the oil film force of the tilting pad bearing, an Euler method was used to get the rotor trajectory of the tilting pad bearing, and a linear equation of space was taken to obtain the trajectory of the front rotor of the spindle. Finally,an electromagnetic actuator was used as an auxiliary control device to adjust the tangential acceleration and normal acceleration of the tilting pad bearing rotor. The simulation results show that, the rotor trajectory can converge to a circle and can reduce the phase difference of the front and rear bearings. The amplitude of the front end of the spindle can be reduced by 60.26%.