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Switch semi-active control is introduced to improve the performance of the floating raft vibration isolation system on isolating vibration in the vicinity of the resonance frequency. A switch-controllable linear damper based on the electromagnetic damping principle is developed, whose characteristic parameters are obtained by experiment. The dynamic model of a semi-active control floating raft vibration isolation system is established, and two switch control algorithms are proposed. Algorithm 1 aims to minimize the kinetic energy of the raft, and Algorithm 2 balances minimizing the kinetic energy of the raft and minimizing the input energy of the system. The simulations of the original system, the system with the controllable damper, and the system with the damper controlled by the algorithms are carried out. The vibration acceleration responses of the foundation of the systems are used to evaluate the vibration isolation effect. The results show that the switching semi-active control using Algorithms 1 and 2 can significantly suppress the vibration of the system near the resonance frequency. Finally, the test platform of the switch’s semi-active controlled floating raft vibration isolation system is built, and the simulation results are verified by the experimental result.

In this paper, the dynamic characteristics of some controllable floating raft test system are studied. The virtual dynamic model of the system is established in Adams, the acceleration responses of system in different damping states are simulated, and the vibration level differences of system in different damping states are contrasted. The results show that it is able to improve the vibration isolation property in wide frequency range by switch on-off control of the controllable damper. Finally the possibility to improve the vibration isolation property of system by semi-active control of variable damper is discussed.

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