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On structure-borne sound: experiments showing the initial transient acoustic wave field generated by an impacted plate
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-8355-2414
1994 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 96, no 5, p. 2791-2797Article in journal (Refereed) Published
Abstract [en]

The initial propagating transient acoustic field in air generated by an impacted plate is visualized. The transient traveling flexural waves in the plate created by the impact are shown, simultaneously. The experiments are performed using double pulsed holographic interferometry. It is shown that flexural waves in a plate act as a series of traveling acoustic sources. Since the flexural waves in the plate are dispersive the trace matched acoustical waves further away from the impact source propagate at a smaller angle relative to the plate than those closer to the impact. An observer situated close to the plate and away from the impact point will first receive high-frequency components of the sound. A quantitative evaluation of the acoustic field also shows that if there is a transient increase in pressure on one side of the plate there will be a similar decrease on the other side.

Place, publisher, year, edition, pages
1994. Vol. 96, no 5, p. 2791-2797
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-3265DOI: 10.1121/1.411285Scopus ID: 2-s2.0-0027973122Local ID: 112a1c50-02b9-11dc-ad0a-000ea68e967bOAI: oai:DiVA.org:ltu-3265DiVA, id: diva2:976121
Note
Godkänd; 1994; 20070515 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Wåhlin, AndersGren, PerMolin, Nils-Erik

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