Systematic Optimization of an Exhaust System to Meet Noise Radiation Criteria at Idle

Paper #:
  • 2014-01-0006

Published:
  • 2014-04-01
Citation:
Elnady, T., Abom, M., and Yang, Y., "Systematic Optimization of an Exhaust System to Meet Noise Radiation Criteria at Idle," SAE Int. J. Passeng. Cars - Mech. Syst. 7(3):915-926, 2014, https://doi.org/10.4271/2014-01-0006.
Pages:
12
Abstract:
Exhaust noise is a major contributor to the radiated noise level of a vehicle, especially at idle. The radiated noise level has to meet a certain criteria based on regulation and consumer demand. In many cases, the problem appears after the vehicle is manufactured and the tailpipe noise measurement is performed indicating a high noise level that needs to be reduced. This paper describes one of those cases where the radiated noise level of a certain passenger car at idle was required to be reduced by 6 dB(A). The exhaust system consists of one main muffler and one auxiliary muffler. A 1D two-port model of the exhaust system including the two mufflers was built using commercial software. This model was validated against the measurement of the two-port matrix of both mufflers. The model was then used together with tailpipe noise measurements to estimate the characteristics of the source strength and impedance. Using a 1D model of the complete system, it was possible to propose several modifications for the vehicle manufacturer to choose from. A systematic optimization approach is presented in this paper describing several suggestions to reduce the radiated tailpipe noise.
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

Technical Paper / Journal Article
2010-09-28
Article
2017-03-13
Training / Education
2018-05-07
Technical Paper / Journal Article
2010-09-28