Abstract
Based on the finite element method, this paper first discusses the sound absorption characteristics of acoustic materials with a cavity structure backed by air, and then takes the internal cavity of the acoustic material and the acoustic material as the research object, considering the sound waves of different frequencies and different incident angles. The maximum sound absorption coefficient is used as the objective function to optimize the design of the cavity acoustic material. The calculation results show that the sound absorption performance of the optimized acoustic material has been significantly improved.
Highlights
Laying sound-absorbing acoustic materials on the surface of underwater structures is a common method to improve its acoustic stealth performance [1]
This article focuses on acoustic materials with internal cavities, with the largest sound absorption coefficient As the objective function, considering the incident waves of different frequencies and different angles, the Nelder-Mead algorithm is used to optimize the design of the acoustic material cavity line and the acoustic material material
The acoustic material model based on the finite element method is shown in Fig.4, Periodic boundary conditions need to be set at the unit cell structure and the fluid boundary to realize the simulation of the infinite acoustic material
Summary
Laying sound-absorbing acoustic materials on the surface of underwater structures is a common method to improve its acoustic stealth performance [1]. Based on the transfer function method, Sharma GS et al equated the cavity acoustic material to a uniform material and calculated its sound absorption coefficient [5,6,7]. Ivansson SM et al [9] used multiple scattering methods to solve the sound absorption characteristics of cavity acoustic materials. Hennion [10] uses the finite element method to study the reflection and transmission characteristics of periodic cylindrical cavity acoustic materials, Tan Hongbo [11] The sound absorption properties of acoustic materials containing spherical, cylindrical and conical cavities are studied. This article focuses on acoustic materials with internal cavities, with the largest sound absorption coefficient As the objective function, considering the incident waves of different frequencies and different angles, the Nelder-Mead algorithm is used to optimize the design of the acoustic material cavity line and the acoustic material material
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