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Acoustical Absorption and Critical Thickness

AuthorsPfretzschner, Jaime; Rodríguez Alves, Rosa M.
KeywordsAbsorption coefficient function
Acoustical absorption
Porous acoustic materials
Critical depth
Issue DateSep-2001
PublisherAcoustical Society of Italy
Citation17th International Congress on Acoustics, Architectural Acoustics, Measurement in building acoustics, 7A.11.03
AbstractThis paper presents a theoretical and experimental study that shows the presence of a horizontal asymptote of the absorption coefficient function α(f) in relation with the thickness of the sample. This asymptote conduces to the existence of a critical depth, characterized by a certain attenuation of the sound wave, that limits the absorbing properties of the material. Above this thickness, α(f) does not change noticeably and a progressive increase of the layer thickness only means an unnecessary waste of acoustic material.
DescriptionCommunication presented at the 17th International Congress on Acoustics, Rome, 2-7 September 2001.
Appears in Collections:(IA) Comunicaciones congresos

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