Research On Acoustic-Vibration Coupling Characteristics Of Black Hole Sandwich Structure

The sandwich structure has the characteristics of light weight and high strength,and is widely used in various engineering fields.In the fields of ships,aerospace and other engineering fields,the issue of vibration and noise has attracted increasing attention.Aiming at the vibration and noise environment of the cabin structure of large carriers such as ships,this paper relies on the energy focusing principle of the acoustic black hole structure to construct and design a new type of lattice matrix sandwich structure,and comprehensively utilizes the acoustic absorption principle of the acoustic black hole structure and the sound insulation characteristics of the sandwich structure in order to achieve reduce the vibration response and radiated noise of the large carrier cabin structure.First of all,this paper studies the dynamics and acoustic characteristics of a new periodic sandwich plate structure with a single cell structure.This paper introduces the theoretical basis of wave propagation and energy focusing of one-dimensional and two-dimensional acoustic black hole structures,and performs dynamic modeling and analysis of twodimensional acoustic black hole structures.At the same time,the natural frequency and vibration modal characteristics of the two-dimensional acoustic black hole unit cell structure are calculated and analyzed.Acoustic simulation software was used to calculate the sound insulation characteristics of the new acoustic black hole unit structure.By comparing and analyzing with the results of the acoustic impedance tube test,the correctness of the analysis results using the acoustic software is well verified,which provides an analytical basis for subsequent research.Secondly,the acoustic black hole periodic beam structure and the acoustic black hole sandwich beam structure are constructed and designed respectively,and the frequency response function of the structure is derived and analyzed.The vibration modes and frequency response functions of the acoustic black hole periodic beam structure and the acoustic black hole sandwich beam structure are calculated respectively.At the same time,the acoustic black hole periodic beam structure and the acoustic black hole sandwich beam structure were constructed.The vibration response test platform was used to test the frequency response functions of these two structures.The experimental test results agree well with the numericalsimulation results,which can verify the frequency of this paper.The correctness of the response analysis results.Research shows that the acoustic black hole sandwich beam structure can better suppress the vibration response of the beam structure than the acoustic black hole periodic beam structure,and can effectively adjust the band gap characteristics of the acoustic black hole sandwich beam structure.Finally,this paper studies the vibration response and acoustic-coupling characteristics of acoustic black hole sandwich plate structures.The frequency response characteristics of the acoustic black hole periodic sandwich plate structure are calculated and analyzed.The vibration response of the new sandwich plate structure can be suppressed by using the periodic band gap characteristics and locally optimizing its structural parameters.At the same time,the acoustic radiation modes of the acoustic black hole sandwich flat plate structure are calculated,the vibration radiation noise characteristics of the sandwich flat plate structure are analyzed,and the influence of the structural material parameters on the acoustic vibration coupling characteristics is discussed.The research results show that the use of the band gap characteristics of the periodic sandwich plate structure can effectively suppress the vibration and noise radiation characteristics of the structure.At the same time,the use of local parameter optimization can improve the sound insulation performance of the new acoustic black hole sandwich flat plate structure.