Non-closed acoustic cloaking devices enabled by sequential-step linear coordinate transformations [PDF]
Scientific Reports, 2021 Hitherto acoustic cloaking devices, which conceal objects externally, depend on objects' characteristics. Despite previous works, we design cloaking devices placed adjacent to an arbitrary object and make it invisible without the need to make it enclosed.
Zahra Basiri +3 more
doaj +2 more sources
Omnidirectional acoustic cloaking against airborne sound realized by a locally resonant sonic material [PDF]
Scientific Reports, 2022 We report that a locally resonant sonic material realizes omnidirectional acoustic invisibility in air. To achieve acoustic cloaking in the low-frequency regime, we axisymmetrically placed elastic rods comprised of silicone rubber and lead around a ...
Kei Matsushima +2 more
doaj +2 more sources
Multilayer acoustic invisibility cloak based on composite lattice [PDF]
Scientific Reports, 2022 A concentric cylindrical cloak is showed here to achieve the acoustic cloaking phenomenon. The introduced structure consists of MNE layers and water in MNE substrate in the MHz frequency range.
Mansour Zaremanesh, Ali Bahrami
doaj +2 more sources
Acoustic transmissive cloaking with adjustable capacity to the incident direction [PDF]
Microsystems & Nanoengineering, 2022 Zero-refractive-index (ZRI) phononic crystals (PhCs), in which acoustic waves can be transmitted without phase variations, have considerable potential for engineering wavefronts and thus are applicable to invisibility cloaking.
Meng Lian +5 more
doaj +2 more sources
Multi-Directional Cloak Design by All-Dielectric Unit-Cell Optimized Structure [PDF]
Nanomaterials, 2022 In this manuscript, we demonstrate the design and experimental proof of an optical cloaking structure that multi-directionally conceals a perfectly electric conductor (PEC) object from an incident plane wave.
Muratcan Ayik +4 more
doaj +2 more sources
Special transformations for pentamode acoustic cloaking [PDF]
Journal of the Acoustical Society of America, 2012 The acoustic cloaking theory of Norris [Proc. R. Soc. London, Ser. A 464, 2411–2434 (2008)] permits considerable freedom in choosing the transformation f from physical to virtual space. The standard process for defining cloak materials is to first define f and then evaluate whether the materials are practically realizable.
Andrew Norris
exaly +4 more sources
A novel smart hybrid multimorph piezoelectric spherical shell cloak for broadband near-perfect underwater acoustic camouflage applications [PDF]
Scientific ReportsNon-visual auditory camouflage plays a major role in the art of underwater deception. In this work, a hybrid active/semi-active omnidirectional cloaking shell structure composed of alternate complementary piezoelectric and smart viscoelastic (PZT/SVE ...
Seyyed M. Hasheminejad, Ali Kasaeisani
doaj +2 more sources
Ultrathin acoustic cloaking by a conformal hybrid metasurface. [PDF]
Sci Rep, 2019 AbstractUltrathin acoustic cloaking of obstacles with arbitrary shape is achieved by a conformal hybrid metasurface, which is composed of an outer layer of phase-control metasurface (PCM) and an inner layer of near-zero-index metasurface (NZIM). Here, the PCM and NZIM are discretized into two types of labyrinth elements.
Wang Y, Cheng Y, Liu X.
europepmc +4 more sources
Engineered Diffraction Gratings for Acoustic Cloaking
Physical Review Applied, 2019 We show that engineered diffraction gratings can considerably simplify the design and performance of acoustic devices. Acoustic reflecting gratings based on rectangular cavities drilled on an acoustically rigid surface are designed in such a way that all the incident energy is channeled towards the diffracted mode traveling in the oposite direction of ...
Daniel Torrent, Yong Li, Yabin Jin
exaly +5 more sources
Acoustic cloaking design based on penetration manipulation with combination acoustic metamaterials
Journal of Low Frequency Noise Vibration and Active ControlThe acoustic wave transmission manipulation ability is the most important performance for the acoustic metamaterials. To manipulate the acoustic transmission, the combination acoustic metamaterials structures are involved, and the two-directional ...
Chen Luyun
exaly +2 more sources