Adaptive Fuzzy Sliding-mode Controller for Hybrid Vibration Isolation Systems

Aiming at the problem of poor vibration isolation effect of passive vibration isolators of mechanical equipment in low frequency range, an electric- magnetic- mechanical conversion model for magnetostrictive actuators is established, and an adaptive fuzzy sliding-mode control algorithm is proposed. The stability of the controller is proved by Lyapunov method. Then, the control strategy and the magnetostrictive actuator are used in a hybrid vibration isolation system. The simulation results show that in whatever conditions of single frequency excitation, multi-frequency excitation or random excitation, the adaptive fuzzy sliding-mode controller has good dynamic characteristics and robustness. This property can also be used to improve the isolation efficiency and broaden the vibration isolation frequency band of the hybrid system, and effectively reduce the force transmitted to the foundation of the mechanical equipment.