局域共振声学超材料耦合效应研究

Coupling Effect of Local Resonance in Acoustic Metamaterials

针对传统的声学超材料存在降噪频率窄、造价成本过高、实现难度大等诸多问题,提出一种带柔性薄膜结构的Helmholtz共振腔声学超材料结构,以局域共振耦合效应现象为出发点,推导出Helmholtz共振腔和柔性薄膜的数学模型。运用COMSOL Multiphysics软件对模型进行仿真分析,研究表明,该结构产生了2个局域共振峰值。为了实现对声学超材料消声频带的控制,向薄膜内注入液体。实验测试表明,当注液量从0增至35 mL时,薄膜峰值处的共振频率从612 Hz偏移到446 Hz,偏移量为166 Hz。所设计的局域共振声学超材料在频带范围内对低频噪声具有良好的控制效果,为声学超材料的设计提供了一种方法。

Traditional acoustic metamaterials face issues including narrow noise reduction frequency range,high cost,and difficulty in implementation.To address these problems,a Helmholtz resonant cavity acoustic metamaterial structure with a flexible thin film is proposed.Starting from the phenomenon of local resonance coupling effects,mathematical models of the Helmholtz resonant cavity and the flexible thin film are derived.These models are simulated and analyzed using COMSOL Multiphysics software.The results show that the structure produces two local resonance peaks.To achieve control over the noise reduction frequency band of the acoustic metamaterial,liquid is injected into the thin film.Experimental results show that when the injection volume increases from 0 to 35 mL,the resonance frequency of the thin film shifts from 612 Hz to 446 Hz,resulting in a displacement of 166 Hz.The designed local resonance acoustic metamaterial effectively controls low-frequency noise within the specified frequency band,providing a novel approach for the design of acoustic metamaterials.