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Experimental Assessment of a Single-layer Near-field Acoustic Holography Method in an Enclosed Space
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-5723-9571
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-3609-3005
2015 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Planar near-field acoustic holography (PNAH) is preferably performed in anechoic spaces, since the wave-field extrapolation only holds for outgoing waves, which makes the study of certain vibro- acoustic sources a troublesome pursuit. To overcome this limitation, a number of imaging alternatives have been investigated in recent years with the use of double-layer pressure (or particle velocity) measurements, as well as of single-layer pressure and velocity measurements. Unlike these methods, our approach is to use single-layer pressure measurements and extend the PNAH method such that it is valid in the presence of a parallel reflector. In this paper we address the experimental validation of the extended PNAH formulation by means of reconstructing the pressure radiated by an omnidirectional source and exploring a few excitation frequencies. The reconstruction performance is investigated via both the free-field and the extended PNAH techniques.

Place, publisher, year, edition, pages
2015.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-172056OAI: oai:DiVA.org:kth-172056DiVA: diva2:845449
Conference
Euronoise 2015, May 31 - June 3, Maastricht
Funder
Swedish Research Council
Note

QC 20150828

Available from: 2015-08-11 Created: 2015-08-11 Last updated: 2015-08-28Bibliographically approved

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fulltext(4221 kB)94 downloads
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