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Design and Development of Tunable Exhaust Muffler for Race Car
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 1, 2016 by SAE International in United States
Annotation ability available
The Exhaust Noise is one of the major noise pollutants. It is well-known that for higher noise reduction, the engine has to bear high back pressure. For a race car, back-pressure plays a major role in engine's performance characteristics.
For a given condition of engine rpm & load, conventional muffler has a fixed value of back-pressure and noise attenuation. Better acceleration requires low back-pressure, but the exhaust noise should also be less than the required (Norm) value (110 dBA). This contradicting condition is achieved here by using a ‘Butterfly Valve’ in this novel exhaust muffler. The butterfly valve assumes 2 positions i.e. fully open & fully closed. When the valve is fully closed, the noise reduction will be higher, but the back-pressure will also shoot up. When open, noise reduction will be less and so the back-pressure. So, when better performance is required, the valve is opened and back-pressure is reduced.
The muffler is designed for a 4 cylinder 600 cc engine. The sound transmission loss (STL), which is the measure of effectiveness of the muffler, is also verified experimentally. The reduction in the back pressure at 11000 engine rpm is around 40% with open valve, as compared closed valve condition. The increase in STL, with closed valve, is around 15∼20 dB higher when compared to open valve condition.
CitationTalegaonkar, S., Agrewale, M., and Chhaganlal Vora, K., "Design and Development of Tunable Exhaust Muffler for Race Car," SAE Technical Paper 2016-28-0193, 2016, https://doi.org/10.4271/2016-28-0193.
- Daniel Potente, ‘General Design Principles on an Automotive Muffler’, proceedings of Acoustic 2005, 9-11 Nov 2005
- Dube, P. and Sajanpawar, P., "Study of Perforated Mufflers of Circular and Elliptical Cross Sections Using Parametric Technique and Finite Element Methodology," SAE Technical Paper 2007-01-0895, 2007, doi:10.4271/2007-01-0895.
- Munjal M.L., “Acoustics of ducts and Mufflers with Application to Exhaust and Ventilation System Design”, ISBN: 0471847380, Wiley-Inter-science 1987.
- Shah, S., Kuppili, S., Hatti, K., and Thombare, D., "A Practical Approach towards Muffler Design, Development and Prototype Validation," SAE Technical Paper 2010-32-0021, 2010, doi:10.4271/2010-32-0021.
- Vora, K., Patil, A., and Halbe, V., "A Systems Approach to Automotive Exhaust System Development," SAE Technical Paper 2003-26-0029, 2003, doi:10.4271/2003-26-0029.
- Zeynep Parlar, Şengül Ari, Rıfat Yilmaz, Erdem Özdemir, and Arda Kahraman, ‘Acoustic and Flow Field Analysis of a Perforated Muffler Design’, World Academy of Science, Engineering and Technology Vol:7 2013-03-27
- Liu, B., Maeno, M., Hase, S., and Wakamatsu, S., "A Study of a Dual Mode Muffler," SAE Technical Paper 2003-01-1647, 2003, doi:10.4271/2003-01-1647.
- Yadav, P., Muthukumar, A., Kiran, V., Tandon, V. et al., "Optimized Design of Silencer - An Integrated Approach," SAE Technical Paper 2007-26-037, 2007, doi:10.4271/2007-26-037.
- Jothan, AL, “Self Tuning Exhaust Muffler”, US Patent 5831223, 03-11-1998
- Poru N, “Variable Tuned exhaust system”, US Patents 6769511, 03-08-2004
- Benzhu, SANGO Co, “Passive valve Muffler”, US Patents 6102154, 15-08-2000
- Inaba, M., Hayakawa, Y., and Ishida, T., "A Unique Dual-Mode Muffler," SAE Technical Paper 891356, 1989.
- Sageman, Robert J, BarnerCo., “Auto-matic Back-Pressure Relief”, US Patents 6899199, 31-05-2005
- Yamamoto, S., Matsumoto, S., Ueda, T., Kodama, T. et al., "A Study on Intake and Exhaust System of Turbocharged Engine under the Regulations of Formula SAE," SAE Technical Paper 2007-32-0113, 2007.
- Munjal, M. L, “Analysis and Design of Silencers-An Overview of Research at the Indian Institute of Science”, J. Sound and Vibration, Vol. 211(3), pp.425-433, 1998
- Eriksson, L. and Thawani, P., "Theory and Practice in Exhaust System Design," SAE Technical Paper 850989, 1985, doi:10.4271/850989.
- Lilly Jerry G., P.E, JGL Acoustics, Inc. ‘Engine exhaust noise control’, www.enoisecontrol.com
- Honda, Y., Kodama, T., Wakabayashi, K., Nakayama, K. et al., "A Design Method of Engine Intake and Exhaust System for Formula SAE® Vehicle Using Numerical Simulation Codes," SAE Technical Paper 2005-32-0081, 2005.