镜面对称声学元屏的完美吸收

V. Romero-Garc'ia, N. Jim'enez, J. Groby, A. Merkel, Vincent Tournat, G. Theocharis, O. Richoux, V. Pagneux
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引用次数: 17

摘要

在理论上和实验上,本研究报告了镜面对称声超屏产生独立于入射侧的完美吸收。元屏幕的镜像对称共振构建块支持对称和反对称共振,可以调谐到相同的频率(简并共振)。构建块的几何结构经过优化,可以在同一频率上严格耦合对称和反对称共振,从而完美地吸收来自元屏两侧的声音。建立了基于传递矩阵法和外声场模态分解的混合解析模型来分析元屏的散射特性。所得到的几何形状是3D打印的,并在阻抗管中进行实验测试。实验结果与理论预测吻合较好,证明了在通风问题中,这些超滤屏具有较好的吸声效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Perfect Absorption in Mirror-Symmetric Acoustic Metascreens
Mirror-symmetric acoustic metascreens producing perfect absorption independently of the incidence side are theoretically and experimentally reported in this work. The mirror-symmetric resonant building blocks of the metascreen support symmetric and antisymmetric resonances that can be tuned to be at the same frequency (degenerate resonances). The geometry of the building blocks is optimized to critically couple both the symmetric and the antisymmetric resonances at the same frequency allowing perfect absorption of sound from both sides of the metascreen. A hybrid analytical model based on the transfer matrix method and the modal decomposition of the exterior acoustic field is developed to analyze the scattering properties of the metascreen. The resulting geometry is 3D printed and experimentally tested in an impedance tube. Experimental results agree well with the theoretical predictions proving the efficiency of these metascreens for the perfect absorption of sound in the ventilation problems.
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