GMA油膜轴承动态控制轴心轨迹的试验研究

Testing Research of Rotor Center Trajectory of Oil-film Bearing with GMA under Dynamic Control

介绍了一种基于超磁致伸缩驱动器(GMA)的油膜轴承试验台的工作原理,完成了GMA油膜轴承所支撑转子的轴心轨迹动态控制试验。试验结果表明,选择合适的控制电流和相位差后,该油膜轴承能够动态抑制所支撑转子的工频振动,明显缩小所支撑转子的轴心运动轨迹;对于某控制电流,存在一个能使系统的工频振动幅值最小的最佳相位差;随着控制电流的增大,最佳相位差有增加的趋势。试验结果证实了GMA油膜轴承具有强的轴心轨迹控制功能,能够抑制所支撑转子的振动,具有高的位置精度和旋转精度。

The principles of the testing rig supported by controllable oil-film bearing based on GMA were introduced. Dynamic experiments on rotor center trajectory by use of the controllable bearing were completed, whose results show that, if the appropriate control current and phase difference are adopted and imposed on GMA, the controllable hydrodynamic bearing can restrain the vibration value of rotor working frequency dynamically, and reduce obviously rotor center trajectory. Testing results also show that, for a certain control current, there is an optimal value of phase difference which can minimize the vibration amplitude of rotor working frequency; the optimal value of phase difference has a tendency to become bigger with the increase of control current. It is proved that the controllable journal hydrodynamic bearing with GMA has the strong ability to dynamically control the rotor-center locus and reduces the vibration of the rotor supported by the controllable bearing, with outstanding position and rotation precision.