Acoustic metafluids
Acoustic metafluids
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DOI：
10.1121/1.3050288
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发表时间：
2009-02-01
影响因子：
2.4
通讯作者：
Norris, Andrew N.
中科院分区：
文献类型：
--
作者：
Norris, Andrew N.
声学元流体被定义为允许一个流体域在声学上模仿另一个流体域的一类流体，例如声学斗篷。结果表明，最常见的声学元流体是具有各向异性惯性和所谓五模材料弹性特性的材料。该推导使用有限变形的概念来定义一个区域到另一区域的变换。主要结果是通过考虑原始区域和变换区域的能量密度得出的。讨论了声学元流体的特性，并找到了确保映射流体具有各向同性惯性的一般条件，这潜在地开启了实现宽带隐身的可能性。 (C) 2009 美国声学学会.. [DOI: 10.1121/1.3050288]
Acoustic metafluids are defined as the class of fluids that allow one domain of fluid to acoustically mimic another, as exemplified by acoustic cloaks. It is shown that the most general class of acoustic metafluids are materials with anisotropic inertia and the elastic properties of what are known as pentamode materials. The derivation uses the notion of finite deformation to define the transformation of one region to another. The main result is found by considering energy density in the original and transformed regions. Properties of acoustic metafluids are discussed, and general conditions are found which ensure that the mapped fluid has isotropic inertia, which potentially opens up the possibility of achieving broadband cloaking. (C) 2009 Acoustical Society of America.. [DOI: 10.1121/1.3050288]