Active control of the dynamic density of acoustic metamaterials
Active control of the dynamic density of acoustic metamaterials
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DOI：
10.1016/j.apacoust.2021.108001
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发表时间：
2021-03-08
影响因子：
3.4
通讯作者：
Baz, Amr
中科院分区：
文献类型：
--
作者：
Akl, Wael;Baz, Amr
开发具有规定特性的声学超材料的所有尝试都是基于利用超材料单元结构的谐振频率的概念或基于两相或多相域的空间布置来实现影响宏观尺度上的波传播的微观尺度上的密度或体积模量值。在这里，提出了一个完全不同的概念，其中有源声学超材料单元已经被开发来操纵不可压缩材料动态密度，并达到相对稳定的值，为嵌入单元的原始流体域的0.35-13倍。作为控制回路的一部分，添加了压电成分用于密度控制和内部压力梯度测量。已经实现了任意密度值，并且已经开发了具有真正可编程动态密度的超材料单元，将不可压缩流体从被动域转移到主动域。由爱思唯尔有限公司发布
All attempts to develop acoustic metamaterials with prescribed characteristics are based on utilizing the concepts of resonance frequencies of the metamaterial cell structure or on the spatial arrangement of two-or multi-phase domains to realize density or bulk modulus values on the micro scale that influence the wave propagation on the macro scale. In here, a radically different concept is presented whereby active acoustic metamaterial cell has been developed to manipulate the incompressible material dynamic density and reach relative stable values of 0.35-13 times the original fluid domain in which the cells are embedded. Piezoelectric ingredients have been added for density control and internal pressure gradient measurements as part of the control loop. Arbitrary density values have been achieved and a metamaterial cell with truly programmable dynamic density has been developed shifting incompressible fluids from passive to active domains. Published by Elsevier Ltd.