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Experimental Investigation of the Theory of Porous Absorbers

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The problem is to decide which of the two existing theories for porous sound absorbers – the theory of the quasihomogeneous absorber or the Rayleigh theory – is the better description of real fibrous absorber materials. Experimental results for the characteristic impedance and for the constant of propagation of sound waves in fibrous absorbers are the test data for this investigation. The material characteristics of the quasihomogeneous theory become functions of frequency due to the incorrect formulation of the theory. For the same reason there are contradicting results for the characteristic impedance and for the propagation constant. The Rayleigh theory describes the real absorbers with about equal accuracy, however without discrepancy between characteristic impedance and propagation constant. Furthermore the relevant parameters of the absorber, the porosity and the equivalent tube radius are real constants and not frequency functions.
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Document Type: Research Article

Publication date: February 1, 1972

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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