Systematic Optimization of an Exhaust System to Meet Noise Radiation Criteria at Idle
Elnady, Tamer; Abom, Mats; Yang, Yong;
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. Copyright © 2014 SAE International.
Other data
Title | Systematic Optimization of an Exhaust System to Meet Noise Radiation Criteria at Idle | Authors | Elnady, Tamer ; Abom, Mats; Yang, Yong | Keywords | SHAPE OPTIMIZATION;4-POLE PARAMETERS;MUFFLER;SOUND;DUCTS | Issue Date | 1-Jan-2014 | Publisher | SAE INT | Journal | SAE International Journal of Passenger Cars - Mechanical Systems | ISSN | 19463995 | DOI | 10.4271/2014-01-0006 | Scopus ID | 2-s2.0-84903398827 | Web of science ID | WOS:000421796800001 |
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