The Analysis Of Sound Insulation Characteristics Of Membrane-Honeycomb Sandwich Panel Composite Structure

With the development of science and technology,noise control requirements of all walks of life are getting higher and higher.For the shipping industry,the noise generated by large-scale machinery and equipment is inevitable,so the control of noise by ships is particularly important.Especially for ships with special purposes such as military ships,the requirements for noise control are higher.Traditional sound insulation materials,such as honeycomb sandwich panels,are currently widely used for sound insulation control on ships,but for occasions with high requirements for low-frequency noise reduction,the effect of traditional sound insulation materials is not ideal.The light-weight low-frequency sound insulation properties of thin-film acoustic metamaterials have attracted more and more attention from scholars.Therefore,we can consider introducing light-weight thin-film acoustic metamaterials into the sound insulation structure of ships to improve the low-frequency sound insulation effect of the materials.In this paper,it is proposed to add a film-type acoustic metamaterial to the traditional honeycomb sandwich structure.The sound insulation properties of the film-honeycomb sandwich composite structure are studied from three aspects: theoretical calculation,finite element simulation and experimental verification.First,based on the acoustic theory of plane wave propagation,the basic laws of sound insulation are derived,and the law of mass action law is obtained.Based on the modal analysis method,the theoretical model of the film-type acoustic metamaterial is established,the calculation formula of the sound insulation of the film-type acoustic metamaterial is derived,and its sound insulation characteristics are analyzed.Secondly,COMSOL software was used for simulation analysis to calculate the influence of the distribution forms of different masses on the sound insulation properties of metamaterials,and further research was conducted on the m-shaped masses with good sound insulation effects,and the frames,films,holes,etc.were calculated.The influence of structural parameters on the sound insulation curve.Finally,the standing wave tube method is used to measure the sound insulation of small-size specimens to verify the reliability of simulation analysis.The sound insulation curves of the thin-film acoustic metamaterial composite structure with additional circular mass and m-shaped mass were measured separately.Comparison with the simulation results confirmed that the conclusion of the simulation calculation is reliable.The m-shaped masses proposed in this paper have better low-frequency sound insulation than traditional masses.The addition of thin-film acoustic metamaterials to honeycomb sandwich panels provides new ideas for the practical application of thin-film acoustic metamaterials.