This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Design of a Hybrid Exhaust Silencing System for a Production Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 16, 2005 by SAE International in United States
Annotation ability available
A prototype hybrid exhaust silencing system consisting of dissipative and reactive components is designed based on the boundary element method (BEM) with a specific emphasis on its acoustic performance as evaluated relative to a production system. The outer dimensions of the prototype system are comparable to its production counterpart, which has two silencers connected by a pipe. The predicted transmission loss by BEM for the prototype is compared with the experimental results in an impedance tube for both the prototype and production hardware, providing a design guidance for the former. The sound pressure levels measured at the tailpipe exit during the engine ramp-up experiments in a dynamometer laboratory are presented to compare the two systems, providing the final assessment. The acoustic effect of the pipe connecting the two prototype silencers is also examined computationally, along with a discussion of the measured flow performance and the surface temperatures of silencers in both systems.
|Technical Paper||Neither dB(A) nor Loudness: Beyond them?|
|Technical Paper||Noise Reduction of Heavy-Duty Trucks|
|Technical Paper||A Review of Current Techniques for Measuring Muffler Transmission Loss|
CitationLee, I., Selamet, A., Huff, N., and Hrdlicka, M., "Design of a Hybrid Exhaust Silencing System for a Production Engine," SAE Technical Paper 2005-01-2349, 2005, https://doi.org/10.4271/2005-01-2349.
SAE 2005 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V114-6; Published: 2006-02-01
Number: V114-6; Published: 2006-02-01
- Beranek, L. L. 1988 “Noise and Vibration Control,” Institute of Noise Control Engineering Washington, DC.
- Brebbia, C. A. Telles, J. C. F. Wrobel, L. C. 1984 “Boundary element techniques: theory and applications in engineering,” Springer-Verlag New York
- Cheng, C. Y. R. Wu, T. W. 1999 “Exhaust muffler design and analysis using a boundary element method based computer program,” SAE 1999-01-1661 89 95
- Craggs, A. 1977 “A finite element method for modeling dissipative mufflers with a locally reactive lining,” J. Sound and Vib. 54 285 296
- Cummings, A. Chang, I.-J. 1988 “Sound attenuation of a finite length dissipative flow duct silencer with internal mean flow in the absorbent,” J. Sound and Vib. 127 1 17
- Davis, D. D. Stokes, G. M. Moore, D. Stevens, G. L. 1954 “Theoretical and experimental investigation of muffler with comments on engine-exhaust muffler design,” NACA Report 1192
- Delany, M. E. Bazley, E. N. 1970 “Acoustical properties of fibrous absorbent materials,” Applied Acoustics 3 105 116
- Everest, F. A. 2001 “Master Handbook of Acoustics,” McGraw-Hill New York
- Huff, N. T. 2001 “Materials for absorptive silencer systems,” SAE Noise and Vibration Conference and Exhibition April 30 May 3 SAE Paper No. 2001-01-1458 Traverse City, MI
- Ingard, U. Bolt, R. H. 1951 “Absorption characteristics of acoustic material with perforated facings,” J. Acoust. Soc. Am. 23 533 540
- Ji, Z. L. Ma, Q. Zhang, Z. H. 1994 “Application of the boundary element method to predicting acoustic performance of expansion chamber mufflers with mean flow,” J. Sound and Vib. 173 57 71
- Kirby, R. Cummings, A. 1998 “The impedance of perforated plates subjected to grazing gas flow and backed by porous media,” J. Sound and Vib. 217 619 636
- Li, J. Wahl, T. Yoo, S.-W. Song, A. 2003 “Computational and experimental study on transmission loss of automotive exhaust muffler system,” SAE Noise and Vibration Conference and Exhibition May 5-8 SAE Paper No. 2003-01-1648 Traverse City, MI.
- Munjal, M. L. 1987 “Acoustics of Ducts and Mufflers,” Wiley New York
- Munjal, M. L. Thawani, P. T. 1997 “Effect of protective layer on the performance of absorptive ducts,” Noise Con. Eng. J. 45 14 18
- Munjal, M. L. 2003 “Analysis and design of pod silencers,” J. Sound and Vib. 262 497 507
- Nice, M. 1999 Owens Corning Automotive
- Peat, K. S. Pathi, K. L. 1995 “A Finite element analysis of the convected acoustic wave motion in dissipative silencers,” J. Sound and Vib. 184 529 545
- Selamet, A. Lee, I. J. Ji, Z. Huff, N. T. 2001 “Acoustic attenuation performance of perforated concentric absorbing silencers,” SAE Noise and Vibration Conference and Exhibition April 30 May 3 SAE Paper No. 2001-01-1435 Traverse City, MI.
- Selamet, A. Lee, I. J. Huff, N. T. 2003 “Acoustic attenuation of hybrid silencers” J. Sound and Vib. 262 509 527
- Scott, R. A. 1946 “The absorption of sound in a homogeneous porous medium,” Proc. of the Phy. Soc. 58 165 183
- Scott, R. A. 1946 “The propagation of sound between walls of porous material,” Proc. of the Phy. Soc. 58 358 368
- Sullivan, J. W. Crocker, M. J. 1978 “Analysis of concentric-tube resonators having unpartitioned cavities,” J. Acoust. Soc. Am. 64 207 215
- Sullivan, J. W. 1979 “A method for modeling perforated tube muffler components. I. Theory, II. Applications,” J. Acoust. Soc. Am. 66 772 788