Vibration Isolation and Control Based on Backstepping Control for Magnetic Adjustable Stiffness Fast Steering Mirror

Abstract Fast steering mirrors (FSMs) are vital for achieving precise beam alignment, yet mitigating vibrations poses significant challenges in demanding settings like vehicle-mounted systems. To resolve this problem, we propose a combined approach of passive vibration isolation and active control to enhance vibration isolation and control performance. A magnetic adjustable stiffness mechanism (MASM) is incorporated into the FSM, allowing it to be tuned to quasi-zero stiffness (QZS) to achieve QZS vibration isolation. Additionally, the adjustable stiffness FSM is controlled in a closed-loop using backstepping control (BSC). Simulation results demonstrate that this combined passive and active approach improves the vibration isolation and control performance of the FSM.