Acoustic metamaterials and metasurfaces: a transformative approach for phononic insulators and energy harvesting
Acoustic metamaterials and metasurfaces: a transformative approach for phononic insulators and energy harvesting
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DOI：
10.1117/12.2250271
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发表时间：
2017-01
期刊：
影响因子：
--
通讯作者：
B. Assouar;Shuibao Qi;Yong Li
中科院分区：
文献类型：
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作者：
B. Assouar;Shuibao Qi;Yong Li
首先，我们将提供一些最新的进展，低频声子和声学绝缘体的超颖表面。我们将介绍一个新的概念，吸声的基础上盘绕空间设计，表现出极端的声学性能。设计了一种工作频率为125 Hz、厚度为λ/230的新型吸声体，并对其功能进行了讨论。第二，当我们处理如何减少或吸收低频声音/噪音时，我们将探索以积极的方式使用这些噪音作为能源的新想法。我们从理论上和数值上显示了一种新的声学能量采集器的性能所产生的限制和转换的低频声/噪声干扰电能。我们确实提出了初步的结果，显示了超材料结构产生的电功率密度为0.54μW/cm 3的一个有限的频率，这是一个非常好的值相比，其他的声学能量收集方法。
First, we will provide some recent advances on low-frequency phononic and acoustic insulators based on metasurfaces. We will introduce a new concept of acoustic absorption based on the coiling-up space design which exhibits extreme acoustic properties. A new acoustic absorber operating at 125Hz with deep-subwavelength thickness (~ λ/230) acting as an “acoustic sink” is designed and its functionalities are discussed. Second, as we are dealing with how to reduce or to absorb low-frequency sound/noise, we will explore a novel idea on the use in a positive manner these noises as a source of energy. We theoretically and numerically show the properties of a novel acoustic energy harvester resulting from the confinement and conversion of low-frequency acoustic/noise disturbances to electrical energy. We indeed present preliminary results showing a metamaterial structure producing an electrical power density of 0.54μw/cm3 for one confined frequency, which presents a very good value compared the others acoustic energy harvesting approaches.