As standard ASTM E2611 reveals, the normal incidence sound transmission loss measured on a small sample in an acoustic tube is not only a property of the material but also strongly dependent on boundary conditions (generally unknown) and on the way the material is mounted. This article proposes an experimental method to control the effects of the lateral boundary conditions in an acoustic tube. The main objective is to deduce the properties of a “client element” (material sample) from the measured global acoustic properties of a patchwork composed by the “client material” and a known “host support.” Three patchwork configurations have to be distinguished: patchworks with and without an impervious and rigid interface between the elements and patchworks composed by elements that cannot be identified as equivalent fluids. For each of these configurations, the use of a specific method based on the Mixing Rule Method (MRM) or on the Parallel Transfer Matrix Methods (P-TMM or dP-TMM) used in reverse way is proposed. Numerical and experimental validations are proposed in acoustic tubes on a convenient configuration: a material sample surrounded by an air ring. This configuration allows reducing the material elastic-frame behavior to leave a limp-frame behavior. The proposed methods allow removing the effect of the lateral air ring host surrounding the material. For homogeneous materials, the two methods based on MRM and dP-TMM give similar good results. For non-homogeneous materials or for materials that cannot be modeled as equivalent fluids, only the method based on dP-TMM gives good results.
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April 2021
Research Article|
April 08 2021
Method for controlling boundary condition effects on the measurement of acoustic properties of small samples in tubes
Thomas Dupont
;
Thomas Dupont
a)
1
Department of Mechanical Engineering, École de Technologie Supérieure
, 1100 rue Notre-Dame Ouest, Montréal, Quebec H3C 1K3, Canada
a)Author to whom correspondence should be addressed: [email protected]. Tel.: +1 514 396-8771. Fax: +1-514 396-8530
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Kévin Verdière
;
Kévin Verdière
2
MECANUM, Inc.
, 2444 Rue Bonin, Sherbrooke, Quebec J1K 1C4, Canada
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Philippe Leclaire;
Philippe Leclaire
3
DRIVE EA1859, Univ. Bourgogne Franche Comté, ISAT
, BP 31, 49 rue Mlle Bourgeois, 58027 Nevers, France
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Raymond Panneton
Raymond Panneton
4
CRASH-UdeS, Centre de recherche acoustique-signal-humain de l’Université de Sherbrooke
, 2500 boul. de l’Université, Sherbrooke, Quebec J1K 2R1, Canada
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a)Author to whom correspondence should be addressed: [email protected]. Tel.: +1 514 396-8771. Fax: +1-514 396-8530
Rev. Sci. Instrum. 92, 044906 (2021)
Article history
Received:
July 19 2020
Accepted:
March 14 2021
Citation
Thomas Dupont, Kévin Verdière, Philippe Leclaire, Raymond Panneton; Method for controlling boundary condition effects on the measurement of acoustic properties of small samples in tubes. Rev. Sci. Instrum. 1 April 2021; 92 (4): 044906. https://doi.org/10.1063/5.0022294
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