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The influence of edge geometry on end-correction coefficients in micro perforated plates
Eindhoven University of Technology, Department of Mechanical Engineering, Dynamics and Control, The Netherlands.
Eindhoven University of Technology, Department of Mechanical Engineering, Dynamics and Control, The Netherlands.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0002-9061-4174
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
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2015 (English)In: Journal of Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 138, no 6, 3668-3677 p.Article in journal (Refereed) PublishedText
Abstract [en]

Global expressions are proposed for end-correction coefficients in micro perforated plates (MPPs) using non-dimensional parameters. MPPs are sound absorbers with small perforation diameters such that the Stokes boundary layers fill up almost the entire perforation. Sound absorption does not only occur within the perforation, but also takes place just outside of it. The latter contribution plus the outside inertia effect on the transfer impedance of the MPP are referred to as end-corrections. In order to determine them, an analytical solution employing the very thin Stokes layer assumption has been derived. However, this assumption requires empirical coefficients in the end-corrections for accurate results. To explore the effects of various parameters a numerical model is used. This model is verified with open-end reflection coefficient measurements. The most prominent result from this study is that compared to plate thickness, the ratio of perforation diameter to Stokes layer thickness (Shear number) and edge geometry affect the end-correction coefficients more significantly. The effect of plate thickness can be neglected for practical purposes, therefore, expressions for the end-corrections in terms of Shear number and edge geometry are provided. The relative error of these expressions is <3% compared to the numerical results. 

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. Vol. 138, no 6, 3668-3677 p.
Keyword [en]
MICROPERFORATED MATERIALS, DUCT, FLOW
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-181392DOI: 10.1121/1.4937748ISI: 000367535700034PubMedID: 26723322ScopusID: 2-s2.0-84950979050OAI: oai:DiVA.org:kth-181392DiVA: diva2:899424
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QC 20160201

Available from: 2016-02-01 Created: 2016-02-01 Last updated: 2016-09-16Bibliographically approved

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Efraimsson, GunillaÅbom, Mats
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Aeronautical and Vehicle EngineeringVinnExcellence Center for ECO2 Vehicle designLinné Flow Center, FLOWMarcus Wallenberg Laboratory MWL
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Journal of Acoustical Society of America
Fluid Mechanics and Acoustics

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