This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Experimental Validation of Vibro-Acoustic Modeling of Automotive Mufflers and Transmission Covers
Technical Paper
2003-26-0036
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A reactive type of muffler of a 4-stroke Auto-Rickshaw was modeled using a commercially available Acoustic Finite Element Analysis (FEA) software like Sysnoise. Design sensitivity of different geometry parameters of mufflers to its Insertion Loss over a wide frequency range was studied. The analytical results were validated by the Laboratory Speaker test. But in the presence of a hot gas flow, the Insertion Loss characteristics of the muffler were far different. As the flow speed increased, negative attenuation was found in some frequency bands.
The second part of the paper studies the software prediction of structure borne noise from a transmission cover of a Motorcycle. The sound power level was predicted by uncoupled fluid-structure analysis of Boundary Element Method (BEM). To reduce the sound power radiated from its top surface, a ribbed pattern and increase in thickness were proposed. The software output regarding the sound radiation efficiency of the cover was only partly validated.
Authors
Citation
Ambardekar, M., Shivakumar, V., and Kumaresh Babu, T., "Experimental Validation of Vibro-Acoustic Modeling of Automotive Mufflers and Transmission Covers," SAE Technical Paper 2003-26-0036, 2003, https://doi.org/10.4271/2003-26-0036.Also In
References
- Munjal, M. L. “Acoustics of Ducts and Mufflers” John Wiley & Sons, Inc. 1987
- Davies, P.O.A.L. “Practical Flow Duct Acoustics” Journal of Sound & Vibrations 124 1 1988
- Eriksson, L. J Thawani, P. T. “Theory and Practice in Exhaust System Design” SAE Paper No. 850989 1985
- Kaneda, T., et al. “Prediction of Transmission Loss for Motorcycle Muffler,” SAE Paper No. 1999-01-3256 1999
- Fukuda, M. Kojima, N Iwaishi T. “A study on Mufflers with Air Flow: 1 st Report” Bulletin of the JSME 26 214 April 1983
- Inagawa M Nakamura K. “Reducing Exhaust System Noise of Heavy Trucks” JSAE Review 41 52 1980
- Lalor, N Petyt, M. “Modes of Engine Structure Vibration as a Source of Noise” SAE Paper No. 750833 1975
- Beranek, L. L Ver, I. L. “Noise and Vibration Control Engineering, Principles and Applications” John Wiley 1992
- Hirakawa, N. Mihara, A Suwa, J “Study on Predicative Evaluation Method of Noise Generated by Engine” SAE Paper No. 951758 1995
- Agren, A Johansson, O. “Reduction of Noise from the Timing -Transmission Cover on a Diesel Truck engine” SAE 951240 1995
- Liang, P. N. “FEM/BEM Vibroacoustic Evaluations/Validations on Plain and Ribbed Motorcycle Transmission Top Covers” SAE Paper No. 1999-01-1794 1999
- Prikryl, K. “Influence of the Gearbox Housing Surface Ribs for the Radiated Noise” Paper VI, Proc. 4 th Sysnoise Users’ Meeting Leuven Belgium 1997
- VanBuskirk, J. “Noise Problems associated with Geometrically Stiffened Panels” SAE Paper No. 931265 1993
- Steyer, G Campbell B. “Simulation of Radiated Noise from a Transmission Side Cover” SAE Paper No. 972022 1997