Research on Nonlinear Energy Sink Vibration Reduction of Floating Raft System

The floating raft vibration isolation system has the problem of multi-frequency vibration in the process of vibration. The existence of multi-frequency vibration makes it difficult to apply linear vibration absorption. In this paper, the nonlinear vibration absorption is applied to the floating raft vibration control, and the floating raft vibration control strategy using multiple nonlinear energy sinks (NESs) distributed arrangement is proposed for the first time. Considering that the base of the original floating raft system has elastic support, the natural frequencies and modes of the floating raft system are analyzed, and the dynamic models of the floating raft system with different distribution modes of NES are established. Through dynamic analysis, the influence laws of NES distribution on floating raft vibration control are compared. Based on the vibration reduction of low-order and high-order modes, the NES layout mode is analyzed. The results show that the distributed nonlinear energy sinks arrangement can effectively control the vibration of floating raft, and has good vibration damping effect on all modes of floating raft. The floating raft vibration attenuation for low-order and high-order modes should be arranged in different NES placement modes. In conclusion, the study of this paper provides a new and efficient control strategy for floating raft vibration.