Abstract An acoustic model comprising periodic cylindrical cavities embedded in a soft elastic medium with gradient changes of radii and distances is presented. The main advantage of this model is that high sound absorption across a broadband frequency range can be realized. The basic mechanism for sound absorption is based on Fabry–Perot resonance. A numerical model using the finite element method is developed to study the sound absorption performance of the model for different cases. Results from the numerical model are validated with those obtained using an analytical model from literature. Simulation results show that the sound absorption is sensitive to the gradient profile of radii and distances between cavities. An experiment is carried out to verify the acoustic performance of the proposed model. The experimental results, which agree well with those obtained numerically, show that the proposed structure yields high sound absorption peaks in a broadband frequency range. The proposed structure has potential significance for various underwater applications such as the acoustic coating and reducing vibration and noise.

中文翻译：

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在软弹性介质中，随着半径和空腔之间距离的梯度变化，周期性空腔的吸声

摘要 提出了一种包含嵌入软弹性介质中的周期性圆柱腔的声学模型，该模型具有半径和距离梯度变化。该模型的主要优点是可以在宽带频率范围内实现高吸声。吸声的基本机制基于法布里-珀罗共振。建立了使用有限元方法的数值模型，以研究模型在不同情况下的吸声性能。数值模型的结果与使用文献中的分析模型获得的结果进行了验证。仿真结果表明，吸声对半径的梯度分布和腔之间的距离很敏感。进行实验以验证所提出模型的声学性能。实验结果，这与数值上获得的结果非常吻合，表明所提出的结构在宽带频率范围内产生高吸声峰。所提出的结构对各种水下应用具有潜在意义，例如声学涂层和减少振动和噪声。