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Acoustic modeling and testing of a complex car muffler
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
2006 (English)In: International Congress on Sound and Vibration 2006, 2006, 1119-1126 p.Conference paper, Published paper (Refereed)
Abstract [en]

Perforated mufflers are used by exhaust system manufacturers to improve the broadband attenuation at low frequencies, with the drawback that this normally also implies an increased pressure drop. The detailed modelling of this type of muffler depends on knowledge of the perforate impedance which is influenced by hole geometry as well as the details of the flow distribution. The existing formulas for calculation of perforate impedance are semi-empirical and a number of alternatives have been published. One motivation behind this work was to review the existing formulas for perforate impedance using accurate measured data for perforated mufflers. A modified model presented by Bauer 1977 was found to be the best. A second motivation was to show that for a detailed analysis, using 3D acoustic FEM, the mean flow can be neglected except for calculating the perforate impedances.

Place, publisher, year, edition, pages
2006. 1119-1126 p.
Series
13th International Congress on Sound and Vibration 2006, ICSV 2006, 2
Keyword [en]
Acoustic model, Broadband attenuation, Flow distribution, Hole geometry, Mean flow, Modified model, Semi-empirical, Automobile manufacture, Motivation, Mufflers, Acoustic impedance
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-155043Scopus ID: 2-s2.0-84883401037ISBN: 9781627481502 (print)OAI: oai:DiVA.org:kth-155043DiVA: diva2:759444
Conference
13th International Congress on Sound and Vibration 2006, ICSV 2006, 2 July 2006 through 6 July 2006, Vienna
Note

QC 20141030

Available from: 2014-10-30 Created: 2014-10-29 Last updated: 2014-10-30Bibliographically approved

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Åbom, Mats

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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
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