A Study About The Underwater Ascoustic Performance Of Light Weight Epoxy Foam With Imitation Wood Cell Structure

It will have a huge noise when the operation of these equipment within the submarine.In order to prevent the spread of these noise outside and improve the performance of underwater acoustic stealth,it need acoustic decoupling laying tile inside the submarine.Because of its lightweight withstand pressure,and has good acoustic absorption properties,the foam is considered to be an ideal material for the core material of acoustic decoupling tile.It is hard to find the report about the underwater acoustic performance of plastic foam.Development of lightweight pressure foams with excellent sound insulation performance is an urgent practical need.Wood is a natural lightweight withstand pressure porous material.First of all,explores the influence of apparent density of the wood,pore structure and its damping characteristics on the pressure resistance and acoustic performance.then used as inspiration,separately prepared epoxy composite foam and foaming epoxy foam,and carried out the same test.The results showed that: a cellular pore structure is not only light pressure,but also can improve the low-frequency sound absorption properties of porous materials;reduce the apparent density of the porous material to increase the surface area of ??the material,help to improve the ability of the material of the acoustic reflectance;It exists between the acoustic wavelength matching relationship with the pore structure,resulting in a porous material for absorbing sound waves and the presence of selective permeability;poor selection of materials experiments damping properties.The structural factor leads the underwater acoustics performances of material.