Results 221 to 230 of about 2,673 (256)

On the Optimization of Sonic Crystal Acoustic Noise Barriers

INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 2023
Acoustic 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., Galiana-Nieves J., Redondo J., Mangini A. M., Fanti M. P.   +4 more
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Sonic crystals and sonic wave-guides

Measurement Science and Technology, 2005
A 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, 2008
Acoustic 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, null Ming-Hui Lu, null Liang Feng, null Yong-Yuan Zhu, null Shi-Ning Zhu, null Nai-Ben Ming   +5 more
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Effect of Sonication on Crystal Properties

Separation Science and Technology, 1995
Ultrasonic 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, I. Z. Shirgaonkar, A. B. Pandit   +2 more
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Noise Attenuation by Sonic Crystal Window

2019
The 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, Wensheng Luo, Long Bin Tan, Kian Meng Lim, Jinlong Xie, Heow Pueh 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, 2018
Two 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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Negative birefraction of acoustic waves in a sonic crystal

Nature Materials, 2007
Optical birefringence and dichroism are classical and important effects originating from two independent polarizations of optical waves in anisotropic crystals. Furthermore, the distinct dispersion relations of transverse electric and transverse magnetic polarized electromagnetic waves in photonic crystals can lead to birefringence more easily. However,
Ming-Hui, Lu, Chao, Zhang, Liang, Feng, Jun, Zhao, Yan-Feng, Chen, Yi-Wei, Mao, Jian, Zi, Yong-Yuan, Zhu, Shi-Ning, Zhu, Nai-Ben, Ming   +9 more
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Nondiffractive propagation of sound in sonic crystals

The Journal of the Acoustical Society of America, 2008
In this work we present the study of the nondiffractive propagation regime of ultrasonic waves in a two-dimensional periodic acoustic media (sonic crystal) both from the theoretical and the experimental point of view. An analytical treatment of this regime sonic wave propagation is presented, which allows evaluating the parameters of the nondiffractive
Isabel Perez-Arjona, Victor Sánchez-Morcillo, Víctor Espinosa, Kestutis Staliunas, Javier Redondo   +4 more
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Subdiffractive propagation of ultrasound in sonic crystals

Physical Review B, 2007
We present an experimental demonstration of the subdiffractive propagation (self-collimation) of an ultrasound beam in a two-dimensional sonic crystal formed by a square array of steel cylinders inmersed in water. Measurements show that the diffractive spreading of a narrow beam is strongly reduced along the spatially modulated direction of the crystal.
Víctor Espinosa, Víctor J. Sánchez-Morcillo, Kestutis Staliunas, Isabel Pérez-Arjona, Javier Redondo   +4 more
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Band Structure in a Sustainable Sonic Crystal

Materials Science Forum, 2019
During the last few decades many researchers have been interested in acoustic wave propagation in artificial periodic composites known as sonic crystals. Sonic crystals have received renewed attention because they exhibit acoustic band gaps where there are only evanescent waves.
Edson Jansen Pedrosa Miranda Jr., S.F. Rodrigues, J.M.C. dos Santos   +2 more
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