One of the main sources of noise of a vehicle is the engine where its noise is usually damped by means of acoustic mufflers. A very common problem in the modeling of automotive mufflers is that of two flow ducts coupled through a perforate. A new segmentation approach is developed here based on two-port analysis techniques, in order to model perforated pipes using general two-port codes, which are widely available. Examples are given for simple muffler configurations and the convergence of the technique is investigated based on the number of segments used. The results are compared with closed form solutions form the literature. Finally, an analysis of a complicated multichamber perforated muffler system is presented. The two-port simulation results show good agreement with both the measurements, and the simulations using the classical four-port elements.
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e-mail: tamer@asugards.net
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December 2010
Research Papers
Modeling perforates in mufflers using two-ports
T. Elnady,
T. Elnady
ASU Sound & Vibration Laboratory, Faculty of Engineering,
e-mail: tamer@asugards.net
Ain Shams University
, 1 Elsarayat Street, Abbaseya, 11517 Cairo, Egypt
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M. Åbom,
M. Åbom
The Marcus Wallenberg Laboratory for Sound and Vibration Research, AVE,
KTH
, SE-10044 Stockholm, Sweden
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S. Allam
S. Allam
Department of Automotive Technology, Faculty of Industrial Education,
Helwan University
, Elsawah Street-Elkoba, 11282 Cairo, Egypt
Search for other works by this author on:
T. Elnady
ASU Sound & Vibration Laboratory, Faculty of Engineering,
Ain Shams University
, 1 Elsarayat Street, Abbaseya, 11517 Cairo, Egypte-mail: tamer@asugards.net
M. Åbom
The Marcus Wallenberg Laboratory for Sound and Vibration Research, AVE,
KTH
, SE-10044 Stockholm, Sweden
S. Allam
Department of Automotive Technology, Faculty of Industrial Education,
Helwan University
, Elsawah Street-Elkoba, 11282 Cairo, EgyptJ. Vib. Acoust. Dec 2010, 132(6): 061010 (11 pages)
Published Online: October 8, 2010
Article history
Received:
July 6, 2009
Revised:
March 4, 2010
Online:
October 8, 2010
Published:
October 8, 2010
Citation
Elnady, T., Åbom, M., and Allam, S. (October 8, 2010). "Modeling perforates in mufflers using two-ports." ASME. J. Vib. Acoust. December 2010; 132(6): 061010. https://doi.org/10.1115/1.4001510
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