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Modelling multi-modal sound transmission from point sources in ducts with flow using a wave-based method
Trinity College Dublin, Department of Mechanical and Manufacturing Engineering, Ireland.
Trinity College Dublin, Department of Mechanical and Manufacturing Engineering, Ireland.ORCID iD: 0000-0003-0176-5358
Trinity College Dublin, Department of Mechanical and Manufacturing Engineering, Ireland.
DLR, German Aerospace Center, Germany.
2009 (English)In: 16th International Congress on Sound and Vibration, ICSV16, 2009, Vol. 8, 4685-4693 p.Conference paper, Published paper (Other academic)
Abstract [en]

An understanding of the multi-modal propagation of acoustic waves in ducts is of practical interest for use in the control of noise in, for example, aero-engines, automotive exhaust and ventilation systems. In this paper, the propagation of sound from point sources in hard-walled ducts is modelled using a numerical wave-based approach, referred to as the wave expansion method. This is a highly efficient full-domain discretisation method, which requires as few as two-to-three mesh points per wavelength. An inhomogeneous potential flow may be easily included in the method. The numerical solution for point sources embedded in the wall of a circular duct with non-reflective end-conditions and a uniform axial flow is compared with an analytical Green's function solution. A modal decomposition technique is used to provide detailed information about the modal content of the sound field. This study provides an insightful comparison between an analytical and numerical solution to the acoustic field in a duct. The accuracy and robustness of the wave expansion method is assessed for this benchmark problem before its versatility is demonstrated with examples.

Place, publisher, year, edition, pages
2009. Vol. 8, 4685-4693 p.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-159525Scopus ID: 2-s2.0-84868649144ISBN: 978-161567736-8 (print)OAI: oai:DiVA.org:kth-159525DiVA: diva2:785465
Conference
16th International Congress on Sound and Vibration, Krakow, Poland, 5 July 2009 through 9 July 2009
Note

QC 20160226

Available from: 2015-02-03 Created: 2015-02-03 Last updated: 2016-08-22Bibliographically approved

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O'Reilly, Ciarán J.

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf