Study on the Nonlinear Suspension Characteristic of Magnetic Suspended Vibration Isolator

The definition of stiffness and damping for magnetic suspended vibration isolator was proposed in this paper. The coupling relationship between system controller parameters, mechanical structure parameters and dynamic stiffness is revealed by studying the nonlinear stiffness and damping of magnetic suspension vibration isolator. The frequency domain characteristics of nonlinear stiffness of magnetic suspended vibration isolator are studied combined PID control law. The results show that the system has high support stiffness in low frequency and high frequency bands. The amplitude-frequency characteristics of lower stiffness in middle frequency band are bathtub-shaped. The dynamic stiffness of the system can flexibly designed by changing the controller parameters in the stable region of the system.