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Exploration of the differences between a pressure-velocity based in situ absorption measurement method and the standardized reverberant room method

Exploration of the differences between a pressure-velocity based in situ absorption measurement method and the standardized reverberant room method
Exploration of the differences between a pressure-velocity based in situ absorption measurement method and the standardized reverberant room method
Several measurement techniques are available for the determination of the sound absorbing properties of material packages. The Kundt's method and the reverberant room method are the most commonly used techniques and they are standardized. However, both methods cannot be used in situ. In the past it has been shown that the PU in situ method can be used in a broad frequency range (typically from 300 Hz up to 10 kHz), on small samples (typically 0.03 m2 to 0.38 m2 or larger), while hardly being affected by background noise and reflections. Several studies revealed that similar results can be obtained as with the Kundt's tube if the measurements are performed under certain circumstances. A thorough comparison with the reverberant room method has not been conducted yet. In this paper preliminary results are presented of a comparison of the reverberant room method, the PU in situ method, and measurements with PU probes in a reverberant room. Several factors that may cause discrepancies amongst the methods are discussed. In addition, edge effects, which are experienced with the reverberant room method due to the finite size of the sample, are visualized with 3D intensity measurements that are performed in a reverberant room
1939-800X
Cats, Peter
cae67b53-80f0-4a5f-b8e2-03bf3e4f24db
Tijs, Emiel
152dcd61-0cbd-4ce3-97d5-0e2b204a2b86
Fernandez Comesana, Daniel
156c0f0a-b641-4b56-8790-ff3d4dcb96fd
Cats, Peter
cae67b53-80f0-4a5f-b8e2-03bf3e4f24db
Tijs, Emiel
152dcd61-0cbd-4ce3-97d5-0e2b204a2b86
Fernandez Comesana, Daniel
156c0f0a-b641-4b56-8790-ff3d4dcb96fd

Cats, Peter, Tijs, Emiel and Fernandez Comesana, Daniel (2013) Exploration of the differences between a pressure-velocity based in situ absorption measurement method and the standardized reverberant room method. Proceedings of Meetings on Acoustics, 19 (15140). (doi:10.1121/1.4798958).

Record type: Article

Abstract

Several measurement techniques are available for the determination of the sound absorbing properties of material packages. The Kundt's method and the reverberant room method are the most commonly used techniques and they are standardized. However, both methods cannot be used in situ. In the past it has been shown that the PU in situ method can be used in a broad frequency range (typically from 300 Hz up to 10 kHz), on small samples (typically 0.03 m2 to 0.38 m2 or larger), while hardly being affected by background noise and reflections. Several studies revealed that similar results can be obtained as with the Kundt's tube if the measurements are performed under certain circumstances. A thorough comparison with the reverberant room method has not been conducted yet. In this paper preliminary results are presented of a comparison of the reverberant room method, the PU in situ method, and measurements with PU probes in a reverberant room. Several factors that may cause discrepancies amongst the methods are discussed. In addition, edge effects, which are experienced with the reverberant room method due to the finite size of the sample, are visualized with 3D intensity measurements that are performed in a reverberant room

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Published date: 2 June 2013
Organisations: Acoustics Group

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Local EPrints ID: 353400
URI: https://eprints.soton.ac.uk/id/eprint/353400
ISSN: 1939-800X
PURE UUID: a7bbd69f-7c35-45df-8ae7-7688264b58f0

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Date deposited: 06 Jun 2013 08:23
Last modified: 30 Jan 2018 17:35

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