This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Exhaust System Design for Sound Quality
Technical Paper
2003-01-1645
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The exhaust system is one of the major P/T systems for sound quality tuning. The many varieties in exhaust pipe routing and the flexibility in muffler design make it possible to design an exhaust system to deliver tailpipe sound for specific sound quality requirements. It is essential that the tailpipe sound be balanced with other P/T sound to yield the overall sound targets. The primary contribution of an exhaust system is the firing and sub-firing orders. The typical tailpipe sound target contains banded targets for “good” orders as well as “do-not-exceed” targets for the rest. Every order target needs to be met in order to yield the right tailpipe sound. In most cases, the pipe routing and the muffler volumes of mufflers are dictated by package constraints, however, the internal design of muffler with a given volume can create quite different tailpipe sounds. Usually a particular muffler design is able to bring down the excess levels of certain un-wanted orders, but very often it also causes the deficiency of some of the good orders. Numerous design iterations are required to meet all the order targets. This is a costly and time-consuming process if it purely relies on prototype hardware testing. This paper presents a systematic target cascading strategy and a CAE driven design process to design an exhaust system for sound quality. The CAE analysis is extensively used to understand the impact of major design features and identify the optimal combination of these features. Correlation between test and CAE simulation results is also included to illustrate the interpretation of the gap between the target and analysis results, which is used to determine the design direction for subsequent design iterations.
Recommended Content
Technical Paper | Engineering Metrics for Disturbing Sound Elements of Automotive Exhaust Noise |
Technical Paper | Modeling of Engine Exhaust Acoustics |
Technical Paper | Powertrain Sound Quality Development of the Ford GT |
Authors
Topic
Citation
Lee, M., McCarthy, M., Romzek, M., Frei, T. et al., "Exhaust System Design for Sound Quality," SAE Technical Paper 2003-01-1645, 2003, https://doi.org/10.4271/2003-01-1645.Also In
References
- Otto, N. etc. “Guidelines for Jury Evaluations of Automotive Sounds” SAE 1999-01-1822 SAE Noise & Vibration Conference 1999
- Blommer, M. Amman, S. Otto, N. “The Effect of Powertrain Sound on Perceived Vehicle Performance” SAE 1997-01-141 SAE Noise & Vibration Conference 1997
- Pflueger, M. Stuecklschwaiger, W. “Quality Map for Commercial Vehicles” SAE 2001-01-1570 SAE Noise & Vibration Conference 2001
- Terazawa, N. Kozawa, Y. Shuku, T. “Objective Evaluation of Exciting Engine Sound in Passenger Compartment During Acceleration” SAE 2000-01-0177 SAE World Congress 2000
- Hetherington, P. Hill, W. “An Analytical/Empirical Approach to Sound Quality Evaluation of Exhaust Systems” SAE 971872 SAE Noise & Vibration Conference 1997
- Garcia, P. Fuhrmann, B. Genuit, K. Letens, U. “Sound Quality of Exhaust Gas Systems” SAE 1998-29-0005 Engine and Environment: Assessing and Fulfilling Subjective Customer Conference 1998
- Hetherington, P. etc. “Simulation Odd Fire V-10 Exhaust Noise for Sound Quality Evaluation” SAE 1999-01-1652 SAE Noise & Vibration Conference 1999
- Naylor, S. Willats, R “The Development of a “Sports” Tailpipe Noise with Predictions of Its Effect on Interior Vehicle Sound Quality” SAE 2000-04-0312 European Conference on Vehicle Noise & Vibration 2000
- Garcia, J. Iturbe, J. Planas, J. “Exhaust Noise Design Based on Psycho-Acoustic Parameters” FISITA World Automotive Congress 2000