Results 11 to 20 of about 547 (170)
Active acoustic cloaking in a convected flow field [PDF]
Journal of the Acoustical Society of America, 2019 Acoustic cloaking has mostly been considered within a stationary fluid. The authors herein show that accounting for the effects of convection in the presence of fluid flow is critical for cloaking in the acoustic domain. This work presents active acoustic cloaking in a convected flow field for two different incident fields, corresponding to a plane ...
Mahmoud Karimi +2 more
exaly +3 more sources
Large-scale underwater acoustic cloak based on honeycomb lattice pentamode metamaterials [PDF]
Scientific ReportsThis research explores the development and modeling of an underwater acoustic cloak utilizing pentamode metamaterials. The primary objective is to design a structure that acoustically mimics water, enabling the guidance of waves in such a way that the ...
Fatemeh Ahmadzadeh +2 more
doaj +2 more sources
Ultra-broadband illusion acoustics for space and time camouflages [PDF]
Nature CommunicationsInvisibility cloaks that can suppress wave scattering by objects have attracted a tremendous amount of interest in the past two decades. In comparison to prior methods that were severely limited by narrow bandwidths, here we present a practical strategy ...
Chenkai Liu +3 more
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Latticed pentamode acoustic cloak [PDF]
Scientific Reports, 2015 AbstractWe report in this work a practical design of pentamode acoustic cloak with microstructure. The proposed cloak is assembled by pentamode lattice made of a single-phase solid material. The function of rerouting acoustic wave round an obstacle has been demonstrated numerically.
Yi Chen, Xiaoning Liu, Gengkai Hu
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Acoustic Willis meta-atom beyond the bounds of passivity and reciprocity
Communications Physics, 2021 Metamaterials are designed to control unconventional wave properties in acoustic systems with a range of applications such as acoustic cloaking. Here, the authors design an active acoustic Willis metamaterial that can realize decoupled polarizabilities ...
Choonlae Cho +3 more
doaj +1 more source
Acoustic cloak based on Bézier scatterers [PDF]
Scientific Reports, 2018 AbstractAmong the different approaches proposed to design acoustic cloaks, the one consisting on the use of an optimum distribution of discrete scatters surrounding the concealing object has been successfully tested. The feasibility of acoustic cloaks mainly depends on the number and shape of the scatterers surrounding the object to be cloaked.
Lu, Zhimiao +5 more
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Ultra-broadband passive acoustic metasurface for wide-angle carpet cloaking
Materials & Design, 2021 Acoustic metasurfaces can reshape a reflected wavefront rather arbitrarily, despite being much thinner than the wavelength, thus allowing on-demand wavefront modulation in a variety of applications.
Hong-Tao Zhou +5 more
doaj +1 more source
Archives of Acoustics, 2022 This review article is concerned with metamaterials, i.e. specifically engineered structures with special properties for interaction with sounds. The research on and practical design of these materials have gained momentum in the last decade, when 3D ...
Bartłomiej Sztyler, Paweł Strumiłło
doaj +1 more source
Broadband Acoustic Cloak for Ultrasound Waves [PDF]
Physical Review Letters, 2011 Invisibility devices based on coordinate transformation have opened up a new field of considerable interest. Such a device is proposed to render the hidden object undetectable under the flow of light or sound, by guiding and controlling the wave path through an engineered space surrounding the object.
Zhang, Shu +2 more
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Approximate Quantum and Acoustic Cloaking
Journal of Spectral Theory, 2011 For any E\ge 0 , we construct a sequence of bounded potentials V^E_{n},\, n\in\Bbb N , supported in {an annular region B_ ...
Greenleaf, Allan +3 more
openaire +4 more sources