LeHavreV1, France, Analysis, bibRecord, 000334

Band gap structures in underwater screens of periodically spaced porous plates.

Identifieur interne : 000334 ( France/Analysis ); précédent : 000333; suivant : 000335

Band gap structures in underwater screens of periodically spaced porous plates.

Auteurs : W. Trabelsi [France] ; H. Franklin [France] ; A. Tinel [France] ; S. Derible [France]

Source :

Ultrasonics [ 1874-9968 ] ; 2014.

RBID : pubmed:24485746

Abstract

Acoustic properties of different periodic structures composed of alternating fluid and fluid-saturated porous layers obeying Biot's theory are investigated. At first, the network of modes and the transmission coefficients of finite structures of six plates are studied in the frequency-angle of incidence plane. It is shown that the network of modes concentrates in localized domains of the plane where the transmission coefficients will take the greatest values. With this minimum of six plates, the structures exhibit the main features as for structures containing more plates, especially those with an infinite number of plates. Then, considering infinite structures the band gap calculations are led using the Bloch-Floquet theorem. The evanescent and propagative zones in the frequency-angle of incidence plane are determined. What is proposed here is a class of underwater porous screens that exhibits band gaps extending over great angular domains and enlarging in the frequency domain when the pores at the interfaces of the porous plates are sealed. The effect of porosity on the band gaps is also investigated.

DOI: 10.1016/j.ultras.2014.01.002
PubMed: 24485746

Affiliations:

Links to Exploration step

pubmed:24485746

Le document en format XML

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<front><div type="abstract" xml:lang="en">Acoustic properties of different periodic structures composed of alternating fluid and fluid-saturated porous layers obeying Biot's theory are investigated. At first, the network of modes and the transmission coefficients of finite structures of six plates are studied in the frequency-angle of incidence plane. It is shown that the network of modes concentrates in localized domains of the plane where the transmission coefficients will take the greatest values. With this minimum of six plates, the structures exhibit the main features as for structures containing more plates, especially those with an infinite number of plates. Then, considering infinite structures the band gap calculations are led using the Bloch-Floquet theorem. The evanescent and propagative zones in the frequency-angle of incidence plane are determined. What is proposed here is a class of underwater porous screens that exhibits band gaps extending over great angular domains and enlarging in the frequency domain when the pores at the interfaces of the porous plates are sealed. The effect of porosity on the band gaps is also investigated.</div>
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Band gap structures in underwater screens of periodically spaced porous plates.

Band gap structures in underwater screens of periodically spaced porous plates.

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Abstract

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