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Sound diffusers based on sonic crystals
The Journal of the Acoustical Society of America, 2013A sound diffuser is proposed based on sonic crystals, structures formed by a periodic distribution of cylindrical scatterers in a host medium, which is usually air. The diffuser is a so-called biperiodic structure, as formed by two arrays of sonic crystals with slightly different periodicities.
Redondo, Javier +3 more
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Sonic crystal acoustic switch device
The Journal of the Acoustical Society of America, 2013This study reports a wave-controlled sonic crystal switch device that exhibits a destructive interference-based wave to wave reverse switching effect. By applying control waves, this acoustic device, composed of a two-dimensional square lattice sonic crystal block, reduces acoustic wave transmission from input to output.
Serkan, Alagoz, Baris Baykant, Alagoz
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2010
This work introduces the so named radial sonic crystals, which are a new type of acoustic materials characterized by the fact that their acoustical properties are periodic in the radial direction, either in two dimensions or in three dimensions.These periodic conditions allow the application of Bloch theorem to the corresponding wave equation for sound
Daniel Torrent, José Sánchez-Dehesa
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This work introduces the so named radial sonic crystals, which are a new type of acoustic materials characterized by the fact that their acoustical properties are periodic in the radial direction, either in two dimensions or in three dimensions.These periodic conditions allow the application of Bloch theorem to the corresponding wave equation for sound
Daniel Torrent, José Sánchez-Dehesa
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Sonic crystal with open resonant cavities
Physical Review E, 2007An improved scattering matrix method is developed to study a two-dimensional air-rigid sonic crystal with open resonant cavity, and the band structure and transmission properties are investigated. Numerical results show that both the band structure and the transmission coefficient are sensitive to the shape of the resonant cavity.
Zhilin, Hou +4 more
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On the Optimization of Sonic Crystal Acoustic Noise Barriers
INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 2023Acoustic noise barriers based on sonic crystals constitute one of the most promising innovative bets of recent years in the field of environmental noise control. Sonic crystals are defined as metamaterials formed by periodic arrays of acoustic rigid scatterers embedded in a fluid (usually air).
Ramirez Solana D. +4 more
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Sonic crystals and sonic wave-guides
Measurement Science and Technology, 2005A sonic crystal is a finite-size periodic array composed of scatterers embedded in a homogeneous material. It should have full band-gaps where any sound wave is not allowed to propagate but is reflected completely. It is actually a sonic version of a photonic crystal.
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Acoustic metamaterials of sonic crystals
2008 International Workshop on Metamaterials, 2008Acoustic wave exhibits inherently different characters when propagating in sonic band-gap materials. We address negative refractions of acoustic wave both experimentally and theoretically in two dimensional sonic crystals constructed with steel rods embedded in air.
null Yan-Feng Chen +5 more
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Effect of Sonication on Crystal Properties
Separation Science and Technology, 1995Ultrasonic irradiation resulting in acoustic cavitation was employed during the partial crystallization of diphenyl oxide and dimethyl phenyl carbinol from their respective crude melts. The crystals obtained showed improved purity and better olefactory values for both compounds. This was confirmed by melting point measurements and image analysis of the
R. Srinivasan +2 more
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Noise Attenuation by Sonic Crystal Window
2019The main objective of this study is to develop a novel noise attenuation device which can resolve the conflict of noise and ventilation issues faced by conventional glass or louver windows. Therefore, a sonic crystal (SC) window was designed and was tested in a reverberation room.
Hsiao Mun Lee +5 more
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Enhanced Sound Beam from a Sonic Crystal Waveguide via a Self-Collimating Sonic Crystal
Journal of Theoretical and Computational Acoustics, 2018Two novel composite structures that couple a sonic crystal waveguide (SCW) to a self-collimating sonic crystal (SCSC) are proposed to control beam divergence and transmission. Finite element simulations indicate that an SCSC attached to the output of an SCW can reduce the half-power angular width by 48.81% and enhance the normal radiation intensity by ...
Jin-Fu Liang, Lun-Xun Gong
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