Acoustic modeling and testing of a complex car muffler
2006 (English)In: International Congress on Sound and Vibration 2006, 2006, 1119-1126 p.Conference paper (Refereed)
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.
, 13th International Congress on Sound and Vibration 2006, ICSV 2006, 2
Acoustic model, Broadband attenuation, Flow distribution, Hole geometry, Mean flow, Modified model, Semi-empirical, Automobile manufacture, Motivation, Mufflers, Acoustic impedance
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-155043ScopusID: 2-s2.0-84883401037ISBN: 9781627481502OAI: oai:DiVA.org:kth-155043DiVA: diva2:759444
13th International Congress on Sound and Vibration 2006, ICSV 2006, 2 July 2006 through 6 July 2006, Vienna
QC 201410302014-10-302014-10-292014-10-30Bibliographically approved