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Theoretical Investigation of ‘Open’ Sound Absorption and Its Comparison with ‘Closed’ Damping

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The conditional equation for the linear propagation constant of ‘open’ sound absorption damping is discussed in which the absorption material is described through its flow resistance, its porosity and its structure factor. For different ratios of covering and flow resistance the normal damping diagrams are given. At low frequencies, the damping coefficient for a definite flow resistance has a minimum. The propagation constant of higher modes is investigated at low and high frequencies. The explicit approximate formulae for the propagation constant at low and high frequencies are compared with the accurate results. Finally the absorption coefficient of “open” sound damping is compared with that of ‘boxed’ sound damping.
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Document Type: Research Article

Publication date: December 1, 1973

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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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