Results 141 to 150 of about 547 (170)
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Acoustic Cloaking by Metafluids
2010In this work acoustic cloaking shells are explained and analyzed. Although the materials requirements for building these devices are materials with anisotropy in the mass density, it is explained how realize them with layers of isotropic metafluids based on sonic crystals.
José Sánchez-Dehesa, Daniel Torrent
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Characterization of an acoustic spherical cloak
Inverse Problems, 2015We analyze the following particular cloaking problem: the cloaked region consists of a sphere of a homogeneous medium which is identical with the medium occupying the exterior background space; this sphere is surrounded by a cloaking medium occupying a spherical shell and consisting of material with parameters depending only on the radial variable r ...
George Dassios, Athanassios S Fokas
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Acoustic Cloaking in a Mean Flow
19th AIAA/CEAS Aeroacoustics Conference, 2013Acoustic cloak is a metamaterial that makes the cloaked objects impervious towards sound waves. Existing acoustic cloak designs were originally formulated in a stationary medium. An acoustic shadow appears if those cloaking designs are located in a nonstationary flow field that discloses the concealed objects.
Siyang Zhong, Xun Huang
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Acoustic elliptical cylindrical cloaks
Chinese Physics B, 2009By making a comparison between the acoustic equations and the 2-dimensional (2D) Maxwell equations, we obtain the material parameter equations (MPE) for acoustic elliptical cylindrical cloaks. Both the theoretical results and the numerical results indicate that an elliptical cylindrical cloak can realize perfect acoustic invisibility when the spatial ...
Ma Hua, Qu Shao-Bo, Xu Zhuo, Wang Jia-Fu
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Acoustic Cloaking with Realizable Mass
Applied Mechanics and Materials, 2014A nonideal acoustic cloak with realizable physical properties is proposed. The density and modulus of the designed acoustic cloak are in a reasonable range of material parameters. Full-wave simulations are performed to demonstrate the properties of the proposed cloak.
Ai Guo Zhao +4 more
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Broadband global acoustic cloaking experiments
The Journal of the Acoustical Society of America, 2021Rendering objects invisible to impinging acoustic waves (i.e., acoustic cloaking), is a mature topic in the acoustic community and has diverse applications. Nevertheless, existing approaches and physical demonstrations still exhibit a large range of assumptions and limitations.
Theodor S. Becker +2 more
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Acoustic Cloaking via Homogenization
2013Acoustic cloaking is the mechanism representing the ideal acoustic stealth. We introduce and discuss the acoustic cloak, a material shell that renders an object acoustically ‘invisible’ thanks to its presence surrounding the object. It has been shown that cloaking shells require very complex parameters to be realized.
José Sánchez-Dehesa, Daniel Torrent
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Acoustic ground cloaks revisited
Journal of the Acoustical Society of America, 2015The unique material properties now obtainable with acoustic metamaterials have led to unprecedented control of acoustic wave propagation, resulting in many applications including acoustic cloaking. The two fundamental approaches in the development of a ground cloak are quasiconformal mapping [Li et al. Phys. Rev. Lett.
Peter Kerrian +3 more
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Underwater Acoustical Cloaking
2017Acoustical cloaking is the first example of sound propagation in curvilinear spacetime. Previous works are concerned only with the application of curvilinear coordinates to describe a stationary object’s geometrical structure. The cloaking of underwater objects is an extension of the cloaking of objects in the air. This is more complex than cloaking in
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Acoustic Cloaking by a Superlens with Single-Negative Materials
Physical Review Letters, 2011We propose a specific transformation in cloaking to make an acoustic sensor undetectable, in which the cloaking shell consists of complementary media with single-negative acoustic parameters instead of double-negative ones, and is proved to be a magnifying superlens.
Xuefeng, Zhu +4 more
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