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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, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design.ORCID-id: 0000-0002-9061-4174
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0001-7898-8643
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2015 (Engelska)Ingår i: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 138, nr 6, s. 3668-3677Artikel i tidskrift (Refereegranskat) Published
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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. 

Ort, förlag, år, upplaga, sidor
American Institute of Physics (AIP), 2015. Vol. 138, nr 6, s. 3668-3677
Nyckelord [en]
MICROPERFORATED MATERIALS, DUCT, FLOW
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-181392DOI: 10.1121/1.4937748ISI: 000367535700034PubMedID: 26723322Scopus ID: 2-s2.0-84950979050OAI: oai:DiVA.org:kth-181392DiVA, id: diva2:899424
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QC 20160201

Tillgänglig från: 2016-02-01 Skapad: 2016-02-01 Senast uppdaterad: 2017-11-30Bibliografiskt granskad

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Efraimsson, GunillaÅbom, Mats

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Farkost och flygVinnExcellence Center for ECO2 Vehicle designLinné Flow Center, FLOWMWL Marcus Wallenberg Laboratoriet
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Journal of the Acoustical Society of America
Strömningsmekanik och akustik

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