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Experimental measurement of acoustic properties by a two source method with simultaneous excitation
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).ORCID iD: 0000-0001-7898-8643
2011 (English)In: 18th International Congress on Sound and Vibration 2011, ICSV 2011, 2011, 879-886 p.Conference paper (Refereed)
Abstract [en]

In this work, an experimental technique is presented for the acoustic characterization of materials and devices. The developed technique is based on the two source method with simultaneous excitation, thus reducing the time requirements in comparison with the standard two source technique. A decomposition technique is applied to the pressure measurements associated with each microphone, that include noise of two sources acting simultaneously, and the input signals used to excite the two sources. The procedure allows the calculation of the transfer functions between each microphone and each input separately. Once the individual transfer functions have been obtained, it is possible to characterize an acoustic device by means of its four-pole matrix as well as its transmission loss. The technique has been validated by comparison with theoretical results and experimental methods of earlier studies, for several test cases including a straight duct and a reactive muffler.

Place, publisher, year, edition, pages
2011. 879-886 p.
Keyword [en]
Acoustic characterization, Decomposition technique, Experimental measurements, Experimental methods, Experimental techniques, Straight duct, Test case, Theoretical result, Time requirements, Transmission loss, Two sources, Microphones, Transfer functions, Acoustic properties
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-148730ScopusID: 2-s2.0-84871486103ISBN: 9781618392596OAI: diva2:745440
18th International Congress on Sound and Vibration 2011, ICSV 2011, 10 July 2011 through 14 July 2011, Rio de Janeiro

QC 20140910

Available from: 2014-09-10 Created: 2014-08-11 Last updated: 2014-09-10Bibliographically approved

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Åbom, Mats
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Marcus Wallenberg Laboratory MWLCompetence Center for Gas Exchange (CCGEx)
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