Semi-Active Mode Fuzzy Control for Multi-Dof Floating Raft Isolation System with Magnetic Suspension Isolators

The magnetic suspension isolator is designed. Multi-DOF floating raft vibration isolation system supported by magnetic suspension isolators and ordinary vibration isolators is established. Taking the system as research subject, the dynamic mathematic expressions of ever parts of system are established. Base on the expressions, a semi-active output feedback mode fuzzy controller is designed for floating raft isolation system with magnetic suspension isolators. Then, optimal stiffness of magnetic suspension isolator and the appropriate current could be obtained. Input force and output force response of floating raft isolation system, under complex-frequency exciting signal and shock exciting signal are simulated. The simulation results indicate the isolation performance and resistance characteristic of magnetic suspension supporting floating raft isolation system with semi-active mode fuzzy control method are more effective in vibration isolation in comparison with the passive optimal system.