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A Proposed Quality Criterion for Tubes Used for Measuring Acoustic Absorption and Impedance

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The elementary transmission line theory cannot be applied to the measurement of acoustic absorption and impedance using the stationary wave-tube method when there are appreciable energy losses in the sound wave arising from the presence of the tube walls, and it becomes necessary to invoke more complicated procedures.

By means of the wave theory, the errors between the measured and the correct values of the acoustic absorption and impedances, due to measuring tube losses, are analysed.

Abacuses are provided to calculate the recorded experimental errors, as a function of directly measurable quantities, R, λ 0 and d 0 (distance from rigid end to first minimum).

Finally, and as a corollary, a quality criterion is proposed for the classification of tubes to be used for measurements of acoustical absorption and impedance.
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Document Type: Research Article

Publication date: February 1, 1973

More about this publication?
  • 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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