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Reflection waves by a submerged layer with density sound velocity and attenuation symmetrical gradients

AuthorsCarbó, Rafael ; Molero, Adriana C.
KeywordsSound wave propagation
Inhomogeneous media
Reflection loss
Theoretical study
Density sound velocity
Linear gradient attenuation
Issue DateSep-2002
PublisherSociedad Española de Acústica
CitationForum Acusticum Sevilla 2002. Physical Acoustics ; PHA-Gen-034
AbstractSpecial composite materials could be modeled as an inhomogeneous medium where the density, sound velocity and attenuation of acoustical energy varies. This paper presents a theoretical study of sound wave propagation through media whose properties change along one of the coordinate rectangular axis, properties that remain constant in the plane orthogonal to this axis. The results were applied to obtain the reflection loss of a symmetrical inhomogeneous layer with a central homogeneous layer of thickness D and acoustic impedance ρc, adapted to the water impedance ρ0c0 in both surfaces by a viscoelastic layer of thickness d, with doping of load particles with given density sound velocity and linear gradient attenuation. We assumed the following conditions: low particles concentration, low particle sizes as compared to the wavelength, normal incidence of the acoustic waves and thickness D>>d.
Description6 pages.-- PACS nr.: 43.20.Gp.-- Communication presented at: Forum Acusticum Sevilla 2002 (Sevilla, Spain, 16-20 Sep 2002), comprising: 3rd European Congress on Acoustics; XXXIII Spanish Congress on Acoustics (TecniAcústica 2002); European and Japanese Symposium on Acoustics; 3rd Iberian Congress on Acoustics.-- Special issue of the journal Revista de Acústica, Vol. XXXIII, year 2002.
Appears in Collections:(IA) Comunicaciones congresos
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