An output feedback control based on extended high-gain observer for active vibration control systems with nonlinear Galfenol-based actuators

This paper proposes an output feedback control for Galfenol-based actuators in active vibration control systems, capable of addressing complex challenges such as unknown actuator dynamics, unmodeled external disturbances, hysteresis, and varying loads. The main contribution is to develope an output feedback controller that ensures the actuator produces compensatory forces to effectively suppress unwanted platform motion, achieving zero displacement at the output using only the measured position, without the need for force or acceleration measurements. Simulation results validate the robustness and performance of the proposed controller under various operating conditions, including unknown loads, parameter uncertainties, and external disturbances, demonstrating its potential for implementation in precision mechatronic systems and advanced vibration mitigation applications. Furthermore, the paper investigates the controller's effectiveness while accounting for the hysteresis effects inherent in the Galfenol actuator.