用电磁悬浮动力吸振器控制转子多频不平衡响应的方法

在转子上采用电磁悬浮动力吸振器 ,可以解决转子振动控制中的许多难题。它不必安装在轴承位置 ,因此可以兼顾转子的静、动态特性要求 ;不随转子旋转 ,激励控制方便 ,且不会因吸振器运动而派生出更大的离心力问题 ;因非接触又不随转子旋转 ,不会增加转子的转动惯量 ,原则上其质量可以有较大的选择余地 ;没有外传力或外传力很小。因此 ,电磁悬浮动力吸振器具有重大的工程应用价值。在给出转子 +电磁悬浮动力吸振器系统模型的基础上 ,采用输出调节器理论 ,设计了电磁悬浮动力吸振器控制系统。控制系统的主要目标是 :在指定的多个频率位置 ,将转子的不平衡响应减为零 ,而在其余较宽的频率范围内 ,尽量抑制不平衡响应的水平 ,使之处于非共振量级。仿真分析验证了所提出方法的有效性。

A Method for Controlling Multi-Frequency Unbalance Response of a Rotor with Magnetically Levitated Dynamic Absorber

Many design difficulties in rotor vibration control can be solved by means of electro-magnetically-levitated dynamic absorber. The absorber presented here, not rotating with rotor, can be designed in practice, and it need not to be placed at the bearings. Thus, both the static functions and the dynamic functions of rotor system can be considered simultaneously, and the design difficulties caused by centrifugal force can be overcome also. Therefore, the design conception is of great value for practical use in engineering. The control system of an electro-magnetically-levitated dynamic absorber has been designed using the theory of output regulation. The main aim of the control system is to reduce the unbalance response of the rotor equipped with the absorber to zero at several specified frequencies and to a non-resonant level at other frequencies. The effectiveness of the control method and the feasibility of the absorber for control of rotor unbalance response have been shown by numerical simulations on the frequency characteristics.