磁悬浮主被动隔振系统自适应控制及非线性补偿

针对船舶机械设备低频线谱隔振,提出采用磁悬浮作动器的主被动隔振系统,研究自适应振动控制方法。对磁悬浮作动器用于主被动隔振时的非线性效应进行分析,并采用理论建模及测试修正相结合方式,建立作动器的非线性逆模型,提出具有非线性逆模型补偿环节、分频段控制的改进Fx LMS算法,运算量小、实时性好。多通道磁悬浮主被动隔振装置实验结果表明,该自适应算法能显著减小低频线谱振动能量,可有效抑制作动器非线性引起的振动。

Adaptive control and nonlinear compensation for passive-active hybrid vibration isolation mount using maglev actuator

In order to effectively control the low frequency vibration of ship machinery，a passive-active hybrid vibration isolation mount using maglev actuator was designed. Maglev actuator is excellent for active vibration isolation, with non-contact structure, low stiffness and rapid response. However, the actuator’s nonlinearity has to be restrained by control algorithm. The nonlinearity of maglev actuator was analyzed, the nonlinear reverse model of actuator was built through theoretical analysis and experimental correction, and an improved FxLMS algorithm based on reverse model linearization and frequency range division control was put forward, which has the advantage of low computation load for real time control. Experiments were performed on a multiple-DOF active vibration isolation system, results show that the improved FxLMS algorithm could effectively reduce the vibration energy at targeted frequency, and well restrain the nonlinearity-induced vibration.