Propagation of Intense Acoustic Waves in Sonic Crystals

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 2015 Spain English Publisher:Elsevier BVJournal:Physics Procedia, volume 70, pages 271-274 (issn: 1875-3892,

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Authors: Jimenez, Noe; Sánchez Morcillo, Víctor José; Picó Vila, Rubén; García-Raffi, L. M.; Mehrem Issa Mohamed Mehrem, Ahmed; Hamham, El Mokhta;

doi: 10.1016/j.phpro.2015.08.152

Propagation of Intense Acoustic Waves in Sonic Crystals

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Abstract

[EN] The propagation of intense acoustic waves in a periodic medium (sonic crystal) is numerically studied. The medium consists in a structured fluid, formed by a periodic array of fluid layers with alternating linear acoustic properties and quadratic nonlinearity coefficient. The spacing between layers is of the order of the wavelength; therefore Bragg effects such as band gaps appear. We show that the interplay between strong dispersion and nonlinearity influences wave propagation. The classical waveform distortion process typical of intense acoustic waves in homogeneous media can be strongly altered when nonlinearly generated harmonics lie inside or close to band gaps.

The work was supported by Spanish Ministry of Economy and Innovation and European Union FEDER through projects FIS2011-29731-C02-02 and MTM2012-36740-c02-02. A. Mehrem acknowledges Generalitat Valenciana the support from Santiago Grisolia program (grant 2012/029).

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Spain

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Keywords

Sonic Crystals, 1 D periodic layered media, Harmonics, Intense Acoustic Waves, Second harmonic generation, Physics and Astronomy(all), Intense acoustic waves, Band gaps, FISICA APLICADA, Nonlinear acoustic, Sonic crystals, Layered media, MATEMATICA APLICADA, Band Gaps

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