The Use of Transfer Matrix for the Design of Interferencial Systems in Exhaust Mufflers

Paper #:
  • 2000-01-0728

Published:
  • 2000-03-06
Citation:
Torregrosa, A., Broatch, A., and Payri, R., "The Use of Transfer Matrix for the Design of Interferencial Systems in Exhaust Mufflers," SAE Technical Paper 2000-01-0728, 2000, https://doi.org/10.4271/2000-01-0728.
Pages:
8
Abstract:
One of the main problems in the design of exhaust silencers is the attenuation of low frequency noise. At these frequencies is where the influence of the engine has more importance; moreover, low frequency noise has the possibility of interaction with the mechanical resonances of the exhaust line, producing additional noise and vibration highly disturbing. A suitable solution to this problem is the use of the interferencial behaviour between two acoustic parallel paths, which produces high attenuation at a given frequency associated with the difference between the acoustic lengths of both paths. In the present paper, a general expression for the 4-pole transfer matrix of an interferencial system with two arbitrary branches is presented, which is applied to a simple but realistic exhaust silencer. Results are compared with the transmission loss measured with a modified impulse method, with good agreement between the model and the measurements.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Training / Education
2018-01-10
Technical Paper / Journal Article
2010-09-28