基于变步长LMS方法的磁悬浮飞轮振动抑制  

VIBRATION SUPPRESSION OF MAGNETIC LEVITATION FLYWHEEL BASED ON VARIABLE STEP SIZE LMS METHOD

作　　者：王雨楠 刘昆 Wang Yunan;Liu Kun(School of Aeronautics and Astronautics,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]中山大学航空航天学院,广州510275

出　　处：《动力学与控制学报》2022年第3期77-82,共6页Journal of Dynamics and Control

基　　金：深圳基础研究(重点项目)资助项目(JCYJ20200109142205924)。

摘　　要：针对磁悬浮飞轮转子位移传感器扰动引起的多频谐波振动,提出一种基于最小均方差(LMS)的变步长算法实现谐波振动的有效抑制.建立模型对磁悬浮轴承转子的位移刚度系数κ_(h)和电流刚度系数k_(i)片进行辨识,以位移传感器扰动引起的八倍频噪声为抑制目标,在自适应LMS算法抑制电流扰动基础上,改进一种随转子位移信号频率变化而变化的变步长因子实现自动平衡,利用广义根轨迹分析了引入补偿后系统的闭环稳定性.仿真结果表明所提出的方法能够有效实现对八倍频振动的抑制.To suppress multi-frequency harmonic vibration caused by displacement sensor runout in a magnetic suspension flywheel system,an adaptive variable step-size least mean square(LMS)algorithm is proposed.The model is established to identify the displacement stiffness coefficient κ_(h) and current stiffness coefficient k_(i) of the magnetic bearing rotor.The octave frequency noise caused by the displacement sensor runout is taken as the suppression target.On the basis of the adaptive LMS algorithm,a modified variable step-size factor with changing frequency is improved to achieve automatic balancing.The stability of close loop system is analyzed by generalized root locus.Simulation results show that the proposed method can effectively suppress octave frequency disturbance.

关 键 词：主动磁悬浮轴承 LMS算法 位移传感器扰动 振动控制 

分 类 号：TH133.3[机械工程—机械制造及自动化]