Design and Simulation of Multi-point Double-layer Vibration Isolation System with Active and Passive Integration

A novel piezoelectric-rubber combined vibration isolator was proposed to meet the vibration isolation needs of precision instruments of space vehicle.Piezoelectric stack actuator and the rubber isolator were designed.A scheme of double-layer vibration isolation system with active-and-passive integration and multi-point supports was proposed.The dynamic model of the vibration isolation system was established.Applying the improved Linear Quadratic Regulator(LQR) optimal control,the active control algorithm of the double-layer vibration isolation system was designed,and the numerical simulation analysis was carried out based on Simulink under sinusoidal and random excitations respectively.The results show that the vibration isolator can effectively isolate the displacement excitation from the basis,and prove that the isolation method is effective and feasible.Thus,this work laid a foundation for further experimental studies of the vibration isolation system.