Titre :

Effective Medium Representation of Periodic Designs Based on a Semi-Analytical Approach

Auteur(s) :

Roux, Laetitia [Auteur]
DCNS Group [DCNS]
Audoly, Christian [Auteur]
DCNS Group [DCNS]
Hladky, Anne-Christine [Auteur]
Acoustique - IEMN [ACOUSTIQUE - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Kessissoglou, Nicole [Auteur]
School of Mechanical and Manufacturing Engineering [Sydney]

Titre de la manifestation scientifique :

47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018

Ville :

Chicago, IL

Pays :

Etats-Unis d'Amérique

Date de début de la manifestation scientifique :

2018-08-26

Titre de la revue :

Proceedings of 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018

Éditeur :

Institute of Noise Control Engineering

Discipline(s) HAL :

Sciences de l'ingénieur [physics]
Sciences de l'ingénieur [physics]/Acoustique [physics.class-ph]

Résumé en anglais : [en]

An important practical application of an acoustic metamaterial for underwater applications is as a hull coating on marine vessels. Such coatings may be periodic multilayered media comprising alternating layers of two ...
Lire la suite >An important practical application of an acoustic metamaterial for underwater applications is as a hull coating on marine vessels. Such coatings may be periodic multilayered media comprising alternating layers of two materials, or elastic media with periodic inclusions. This work investigates the use of an effective medium approach to study a 2D periodic design of an elastic medium with soft or rigid inclusions. A semi-analytical approach that combines a differential method and a finite element model of the unit cell of the 2D periodic design is used to obtain the transfer matrix associated with the representative unit cell. Effective properties associated with the unit cell, including the effective speed of sound and the effective mass density, are then derived from the transfer matrix. Finally, the transmission and reflection coefficients of a structure formed by a finite number of unit cells in the direction of sound propagation and immersed in water are computed using the effective medium properties. To assess the validity and accuracy of the method presented here, results for the acoustic performance of the effective medium representation based on the semi-analytical approach are compared with those from direct computation of the 2D design from a finite element model.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL