Measuring sound absorption: considerations on the measurement of the active acoustic power

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Using a local plane wave assumption, one can determine the normal incidence sound absorption coefficient of a surface by measuring the acoustic pressure and the particle velocity normal to that surface. As the measurement surface lies in front of the material surface, the measured active and incident acoustic power will generally deviate from those at the material surface, leading to a possibly inaccurate sound absorption coefficient. This phenomenon is particularly pronounced for poorly absorbing surfaces if sound is not normally incident over the whole material surface. Based on an analytical model, it is shown that the accuracy can be improved by extending the measurement surface upon which the active acoustic power is measured. Experimental results demonstrate the usefulness of this approach, in particular for poorly absorbing surfaces.
Original languageEnglish
Pages (from-to)193-204
Number of pages12
JournalAcustica united with Acta Acustica
Volume100
Issue number2
DOIs
Publication statusPublished - 2014

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sound transmission
acoustics
absorptivity
Acoustics
Sound
plane waves
incidence

Keywords

  • METIS-297480
  • IR-92550

Cite this

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title = "Measuring sound absorption: considerations on the measurement of the active acoustic power",
abstract = "Using a local plane wave assumption, one can determine the normal incidence sound absorption coefficient of a surface by measuring the acoustic pressure and the particle velocity normal to that surface. As the measurement surface lies in front of the material surface, the measured active and incident acoustic power will generally deviate from those at the material surface, leading to a possibly inaccurate sound absorption coefficient. This phenomenon is particularly pronounced for poorly absorbing surfaces if sound is not normally incident over the whole material surface. Based on an analytical model, it is shown that the accuracy can be improved by extending the measurement surface upon which the active acoustic power is measured. Experimental results demonstrate the usefulness of this approach, in particular for poorly absorbing surfaces.",
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author = "E.R. Kuipers and Wijnant, {Ysbrand H.} and {de Boer}, Andries",
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language = "English",
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Measuring sound absorption: considerations on the measurement of the active acoustic power. / Kuipers, E.R.; Wijnant, Ysbrand H.; de Boer, Andries.

In: Acustica united with Acta Acustica, Vol. 100, No. 2, 2014, p. 193-204.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Measuring sound absorption: considerations on the measurement of the active acoustic power

AU - Kuipers, E.R.

AU - Wijnant, Ysbrand H.

AU - de Boer, Andries

PY - 2014

Y1 - 2014

N2 - Using a local plane wave assumption, one can determine the normal incidence sound absorption coefficient of a surface by measuring the acoustic pressure and the particle velocity normal to that surface. As the measurement surface lies in front of the material surface, the measured active and incident acoustic power will generally deviate from those at the material surface, leading to a possibly inaccurate sound absorption coefficient. This phenomenon is particularly pronounced for poorly absorbing surfaces if sound is not normally incident over the whole material surface. Based on an analytical model, it is shown that the accuracy can be improved by extending the measurement surface upon which the active acoustic power is measured. Experimental results demonstrate the usefulness of this approach, in particular for poorly absorbing surfaces.

AB - Using a local plane wave assumption, one can determine the normal incidence sound absorption coefficient of a surface by measuring the acoustic pressure and the particle velocity normal to that surface. As the measurement surface lies in front of the material surface, the measured active and incident acoustic power will generally deviate from those at the material surface, leading to a possibly inaccurate sound absorption coefficient. This phenomenon is particularly pronounced for poorly absorbing surfaces if sound is not normally incident over the whole material surface. Based on an analytical model, it is shown that the accuracy can be improved by extending the measurement surface upon which the active acoustic power is measured. Experimental results demonstrate the usefulness of this approach, in particular for poorly absorbing surfaces.

KW - METIS-297480

KW - IR-92550

U2 - 10.3813/AAA.918699

DO - 10.3813/AAA.918699

M3 - Article

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SP - 193

EP - 204

JO - Acustica united with Acta Acustica

JF - Acustica united with Acta Acustica

SN - 1610-1928

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