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The influence of viscosity on sound transmission through small circular apertures in walls of finite thickness

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The validity of a formula derived earlier for the transmission of sound through small cylindrical apertures in walls of finite thickness has been confirmed by means of a new measuring method with pure tones.

At the same time the influence of viscosity – ignored in the deduction of our earlier formula – was satisfactorily established.

It has been found that a formula of Ingerslev and Nielsen renders a good account of the viscosity losses in the resonance regions, but only gives a very unsatisfactory description of the further course of the transmission characteristic.

The combination of our earlier formula with the formula of Ingerslev and Nielsen for the resonance peaks now gives a reliable rendering of the complete trend of transmission.

A graph has been constructed from which the minimum transmission loss can be read for a given length and diameter of an aperture.
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Document Type: Research Article

Publication date: January 1, 1965

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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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