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Whistling potential for duct components
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
2013 (English)In: SAE Technical Papers: Volume 4, 2013, S A E Inc , 2013, Vol. 4, p. 2013-01-1889-Conference paper, Published paper (Refereed)
Abstract [en]

Components in ducts systems that create flow separation can for certain conditions and frequencies amplify incident sound waves. This vortex-sound phenomena is the origin for whistling, i.e., the production of tonal sound at frequencies close to the resonances of a duct system. One way of predicting whistling potential is to compute the acoustic power balance, i.e., the difference between incident and scattered sound power. This can readily be obtained if the scattering matrix is known for the object. For the low frequency plane wave case this implies knowledge of the two-port data, which can be obtained by numerical and experimental methods. In this paper the procedure to experimentally determine whistling potential will be presented and some examples are given to show how this procedure can be used in some applications for automotive intake and exhaust system components.

Place, publisher, year, edition, pages
S A E Inc , 2013. Vol. 4, p. 2013-01-1889-
Series
SAE Technical Papers, ISSN 0148-7191 ; Vol. 4, 2013
Keywords [en]
Acoustic power, Duct systems, Incident sound waves, Intake and exhaust systems, Numerical and experimental methods, Production of, Scattering matrices, Sound power, Acoustic noise, Exhibitions, Numerical methods, Orifices, Scattering parameters, Ducts
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-134159DOI: 10.4271/2013-01-1889Scopus ID: 2-s2.0-84881214908OAI: oai:DiVA.org:kth-134159DiVA, id: diva2:665640
Conference
SAE 2013 Noise and Vibration Conference and Exhibition, NVC 2013; Grand Rapids, MI; United States; 20 May 2013 through 23 May 2013
Note

QC 20131120

Available from: 2013-11-20 Created: 2013-11-18 Last updated: 2013-11-20Bibliographically approved

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Åbom, Mats

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  • apa
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