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中国物理学会期刊

基于多腔型超构材料的声场增强效应

CSTR: 32037.14.aps.70.20202172

Sound field enhancement based on multiple-cavity metamaterial

CSTR: 32037.14.aps.70.20202172
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  • 构造了一种多腔型基本单元, 由该基本单元构成的声学超构材料能够实现声场增强效应. 此功能的实现是由基本单元的声腔和系统结构之间的相互耦合作用产生的单极子Mie共振引起. 本文通过对多个基本单元进行不同形式的排列组合构造了对称型超构材料和非对称型超构材料, 这两类超构材料可用于实现不同效果的声场增强. 研究表明, 由于对称型超构材料结构的高度对称, 其声场增强效应的实现不受入射声波方向的影响; 而非对称型超构材料的声场增强效应具有较强的方向依赖性, 声波从不同侧入射时, 超构材料对声场的增强效果也不同. 本文关于这两类超构材料的研究将在隔声、声传感器、声通信、非对称性声学器件方面具有潜在的应用前景.

     

    Owing to the low energy density of sound energy in nature, it is difficult to realize the local enhancement effect of sound field in air. Therefore, it is of great significance to explore new physical mechanisms and methods to achieve sound field enhancement. In recent years, artificial Mie resonance structure as a kind of acoustic metamaterial has attracted considerable attention, which has a variety of resonant modes, such as monopolar, dipolar, quadrupolar and higher multipolar modes. Compared with local resonance, acoustic Mie resonance mode has strong acoustic interaction, which can effectively enhance the acoustic field by the coupling of the Mie resonance. In this paper, we design an acoustic metamaterial composed of multiple-cavity unit cells, which is capable of realizing sound field enhancement. The multiple-cavity unit is circular in external shape and it is composed of a circular central cavity and twelve resonators. The twelve resonators are evenly distributed around the circular central cavity, with three resonators combined into a group. This exotic function arises from the compound monopole Mie resonance introduced by mutual coupling between the system structure and the monopole Mie resonance of each unit cell. Symmetric and asymmetric metamaterials are constructed by arranging several multiple-cavity unit cells in different forms. These two kinds of metamaterials can be used to achieve sound field enhancement with different effects. The results show that due to the symmetry of metamaterial structure, the symmetric metamaterials with square, circle, rectangle and regular hexagon shapes can realize the sound field enhancement, which is independent of the direction of incident wave. However, for the asymmetric metamaterial with equilateral triangle shape, the sound intensity in the center of the system varies with incident direction, which indicates that the designed asymmetric metamaterial has a strong dependence on the direction of incident wave. These two kinds of metamaterials constructed in this research can possess a number of potential applications such as in sound insulation, acoustic sensor, noise location, acoustic communication and asymmetric acoustic device. These two kinds of metamaterials constructed in this research can possess a number of potential applications such as in sound insulation.

     

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