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An Optimal Design Methodology for a Family of Perforated Mufflers
Technical Paper
2005-26-053
ISSN: 0148-7191, e-ISSN: 2688-3627
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Sector:
Event:
SIAT 2005
Language:
English
Abstract
Usually when mufflers are designed by well established numerical techniques like boundary element method or finite element method, the numerical model generation is time consuming often limiting the user to try various other possible design alternates. This paper proposes a shorter and faster way to handle such problems by using the conventional four-pole method which retains the transfer matrix for a muffler, this matrix keeps updating with combination of various possible muffler elements. This proves to be a quite efficient one-dimensional approach giving results with satisfactory accuracy. The muffler designs that can be made include all types of expansion chambers, Helmholtz's resonator, extended inlets/outlets, the whole family of perforated elements and many more. It provides a measure of evaluation of the muffler in terms of their Transmission Loss (TL), Insertion Loss (IL) and Noise Reduction (NR).
This paper also provides a comparison of experimental results of silencer of a tractor with that of the prediction made from the model proposed. The basic structure of the silencer includes two sets of cross-flow perforated element plugged with each other. The result comes very close to the actual values obtained. Based on the noise reduction of the silencer, it suggests an improvement. The faster and easier approach facilitates a user to get better design by readily evaluating the performance of any combinations of the above mentioned muffler elements.
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Citation
Mohanty, A. and Pattnaik, S., "An Optimal Design Methodology for a Family of Perforated Mufflers," SAE Technical Paper 2005-26-053, 2005, https://doi.org/10.4271/2005-26-053.Also In
References
- Munjal, M. L. “Acoustics of Ducts and Mufflers” New York Wiley-Interscience 1987
- Bies, D. A. Hansen C. H. “Engineering Noise Control- Theory and Practice” E & FN Spon 1988
- Munjal, M. L. Rao, K. N. Sahasrabudhe, A. D. “Aeroacoustic Analysis of Perforated Muffler Components” J. of Sound and Vibration 114 4 173 188 1988
- Munjal, M. L. Behera, B. K. Thawani, P. T. “Transfer Matrix Model for the Reverse-flow, Three-Duct, Open End Perforated Element Muffler” Applied Acoustics 54 229 238 1998
- Leea, D. H. Kwon, Y. P. “Estimation of the Absorption Performance of Multiple Layer Perforated Panel Systems by Transfer Matrix Method” J. of Sound and Vibration 1998
- Dickey, N. S. Selamet, A. Novak, J. M. “Multi-Pass Perforated Tube Silencers: a Computational Approach” J. of Sound and Vibration 211 3 435 448 1998
- Dokumaci, E. “Sound Transmission in Mufflers with Multiple Perforated Co-axial Pipes” J. of Sound and Vibration 247 3 379 387 2001
- Munjal, M. L. “Formulas of Acoustics” Chapter K in Formulas of Acoustics Mechel, F. P. Springer and Verlag 2002
- Mohanty, A. R. “Experimental and Numerical Investigation of Reactive and Dissipative Mufflers” University of Kentucky Lexington, KY, USA 1993
- Tao, Z. Seybert, A. F. “A Review of Current Techniques for Measuring Muffler Transmission Loss” SAE 03 NVC-38
- Chemingui, N. Biondi, B. “Data Regularization by Inversion to Common Offset” (ICO) Stanford University 2002
- Wu, T. W. Zhang, P. Cheng, C. Y. R. “Boundary Element Analysis of Mufflers with an Improved Method for Deriving the Four-pole Parameters” J. of Sound and Vibration 217 4 767 779 1998