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Article Dans Une Revue Acta Acustica united with Acustica Année : 2014

Viscoelasticity Effect on a Periodic Plane Medium Immersed in Water

Résumé

In this paper we are interested in the acoustic scattering by plane periodic media immersed in afluid. In particular, the effects of viscosity on the stop and pass bands are investigated both theoretically and experimentally.W e consider Np eriods of an elementary cell composed of twop lates, presenting ah igh impedance contrast, with only one being considered viscous. Experimental results demonstrate the influence of the incidence side, and the developed theoretical models validate this phenomenon explicitly.Acomparison of theoretical and experimental reflection spectra of amultilayered structure composed of N (2 ≤ N ≤ 5) periods of plane layers is presented in the frequencyrange from 0.5 to 3.5 MHz. The period consists of twoisotropic plates considered as perfectly bonded, one in aluminum (elastic), the other in polyethylene (viscoelastic). Moreover, the influence of the number of periods is discussed. It is shown that the number of periods necessary to obtain stable stop and pass bands depends on the geometrical and physical characteristics of the viscoelastic plate. Fort he configurations under study,itisdemonstrated that three periods ensure the convergence of the reflection spectrum.
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Dates et versions

hal-03840983 , version 1 (16-01-2023)

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Pierre Maréchal, Olivier Lenoir, Aissam Khaled, Mounsif Ech Cherif El Kettani, Driss Chenouni. Viscoelasticity Effect on a Periodic Plane Medium Immersed in Water. Acta Acustica united with Acustica, 2014, 100 (6), pp.1036-1043. ⟨10.3813/AAA.918783⟩. ⟨hal-03840983⟩
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