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Microstructure based estimation of the dynamic drag impedance of lightweight fibrous materials
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics. Centre for ECO2 Vehicle Design.ORCID iD: 0000-0003-1855-5437
2017 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 141, no 3, p. 1360-1370Article in journal (Refereed) Published
Abstract [en]

This paper focusses on the prediction of one of the main mechanisms of acoustic attenuation, the dynamic drag impedance, of a bundle of fibres typical of lightweight fibrous porous materials. The methodology uses geometrical properties derived from microscopy, and is based on the assumption that the interaction between the shear stress fields of neighbouring fibres may be neglected in the predicted drag force of an individual fibre. An analytical procedure is discussed which provides an estimate of the drag forces acting on infinite longitudinal and transversely orientated cylinders oscillating sinusoidally in a viscous incompressible fluid of infinite extent, at rest. The frequency-dependent viscous drag forces are estimated from the shear stresses on the surface of the cylinders, and may be scaled in terms of fibre diameter distributions and orientation angles in order to predict the dynamic drag impedance of a real material. The range of validity for this modelling approach is assessed through finite element solutions of three different fibre arrangements.

Place, publisher, year, edition, pages
Acoustical Society of America (ASA), 2017. Vol. 141, no 3, p. 1360-1370
National Category
Applied Mechanics
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-205413DOI: 10.1121/1.4976814ISI: 000398962500027Scopus ID: 2-s2.0-85014441362OAI: oai:DiVA.org:kth-205413DiVA, id: diva2:1088960
Funder
Swedish Research Council, 2015-04258
Note

QC 20170419

Available from: 2017-04-18 Created: 2017-04-18 Last updated: 2017-04-28Bibliographically approved

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