负泊松比超材料浮筏设计与减振机理研究

Vibration Reduction Mechanism and Design Method of Floating Raft with Auxetic Components

提出一种基于负泊松比超材料筏架的新型轻量化浮筏减振装置。建立了浮筏-基座-实船的有限元模型。通过数值计算,在船舶满载出港工况下比较4种浮筏的振级落差、筏体强度及传递到船底板的振级,探讨超材料浮筏在实船上应用的可行性。研究表明,采用负泊松比超材料填充的筏体在某些频段能提高浮筏的振级落差,减小主机传递到机舱船底板的振动强度,可以显著降低筏架重量。负泊松比超材料浮筏结构具有轻量化、高隔振效果、高降噪性能等特点,在船舶动力设备舱室减振中具有重要应用价值。

Excessive vibration of marine power equipment will affect the performance and life of the equipment in the ship,and noise caused by excessive vibration will reduce comfort and cause health damage to the crew.This paper presents a negative Poisson's ratio of metamaterial floating raft and its application in ships.A finite element model of the raft floating raft-base-isolator-ship is established,and vibration performances of 4 structural forms of floating rafts are evaluated,with static strength and vibration level difference between the bottom and the engine foot focused on.With the auxetic floating raft the vibration of acceleration in the bottom of the ship can be reduced,so that the noise is reduced.It is verified that the floating raft structure has the advantage of light weight,high degree of isolation and significant noise reduction,and can be applied to the cabin of marine power equipment.