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首页> 外文期刊>Discrete and continuous dynamical systems▼hSeries S >EFFECTIVE ACOUSTIC PROPERTIES OF A META-MATERIAL CONSISTING OF SMALL HELMHOLTZ RESONATORS
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EFFECTIVE ACOUSTIC PROPERTIES OF A META-MATERIAL CONSISTING OF SMALL HELMHOLTZ RESONATORS

机译:小亥姆霍兹谐振器元材料的有效声学特性

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摘要

We investigate the acoustic properties of meta-materials that are inspired by sound-absorbing structures. We show that it is possible to construct meta-materials with frequency-dependent effective properties, with large and/or negative permittivities. Mathematically, we investigate solutions u~ε : Ω_ε → R to a Helmholtz equation in the limit ε → 0 with the help of two-scale convergence. The domain Ω_ε is obtained by removing from an open set Ω ⊂ R~n in a periodic fashion a large number (order ε~(-n)) of small resonators (order ε). The special properties of the meta-material are obtained through sub-scale structures in the perforations.
机译:我们研究了受吸声结构启发的超材料的声学特性。我们表明,可以构造具有频率依赖的有效特性,具有大和/或负介电常数的超常材料。在数学上,我们借助两尺度收敛研究了极限ε→0中的Helmholtz方程的u〜ε:Ω_ε→R的解。通过以周期性的方式从开放集合Ω⊂R〜n中删除大量(阶次ε〜(-n))小谐振器(阶次ε)来获得域Ω_ε。超材料的特殊属性是通过穿孔中的子尺度结构获得的。

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