This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Basic Study on Acoustic Response of Non-symmetric Perforated Duct Mufflers
Technical Paper
2011-37-0023
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Perforated sections are common constituent elements of the commercial mufflers used to control the acoustic performance of the silencer, guide the flow and hold the absorbing material when incorporated. The effect of the geometrical parameters such as hole diameter and porosity on the acoustic response of non-concentric perforated duct muffler has been investigated experimentally using a modified impulse method. The experimental study showed that the acoustic behavior is basically determined by one single geometrical parameter: the modified porosity defined as the ratio between the perforated area and the tube cross section area. Furthermore, a one-dimensional time-domain simulation of the investigated geometries was performed. In this connection, the perforated tube muffler was modeled by an equivalent acoustic system, composed of simple zero- and one-dimensional elements, which incorporate the main attenuation mechanisms present in the muffler. The comparison between the measured and calculated acoustic attenuation has been conducted for a broad range of modified porosities. It showed that the proposed computational methodology can yield results in very good agreement with the experimental data for the high modified porosities. However, low modified porosities of non-concentric perforated tube muffler lead to systematic error in prediction of the transmission loss with increasing the frequency. This indicates a complex frequency dependent influence of the perforation impedance for low perforated fractions.
Authors
Citation
Torregrosa, A., Broatch, A., Djordjevic, N., and Moreno, D., "A Basic Study on Acoustic Response of Non-symmetric Perforated Duct Mufflers," SAE Technical Paper 2011-37-0023, 2011, https://doi.org/10.4271/2011-37-0023.Also In
References
- Elnady, T. Åbom, M. Allam, S. “Modelling Perforates in Mufflers Using Two-ports” Journal of Vibration and Acoustics 132 6 061010 2010 10.1115/1.4001510
- Jayaraman, K. Yam, K. “Decoupling Approach to Modeling Perforated Tube Muffler Components” Journal of the Acoustical Society of Americ 69 2 309 396 1981 10.1121/1.385465
- Munjal, M.L. Rao, K.N. Sahasrabude, A.D. “Aeroacoustic Analysis of Perforated Muffler Components” Journal of Sound and Vibration 114 2 173 188 1987 10.1016/S0022-460X(87)80146-3
- Munjal, M.L. Krishnan, S. Reddy, M.M. “Flow-acoustic Performance of Perforated Element Mufflers with Application to Design” Noise Control Engineering Journal 40 1 159 167 1993 10.3397/1.2827829
- Luo, H. Tse, C.C. Chen, Y.N. “Modeling and Applications of Partially Perforated Intruding Tube Mufflers” Applied Acoustics 44 2 99 116 1995 10.1016/0003-682X(95)91366-B
- Sullivan, J. W. “A Method for Modeling Perforated Tube Muffler Components. I. Theory” Journal of the Acoustical Society of America 66 3 772 778 1979 10.1121/1.383679
- Sullivan, J. W. “A Method for Modeling Perforated Tube Muffler Components. II. Applications” Journal of the Acoustical Society of America 66 3 779 788 1979 10.1121/1.383680
- Sullivan, J.W. Crocker, M.J. “Analysis of Concentric-tube Resonators Having Unpartitioned Cavities” Journal of the Acoustical Society of America 64 1 207 215 1978 10.1121/1.381963
- Thawani, P.T. Jayaraman, K. “Modeling and Applications of Straightthrough Resonators” Journal of the Acoustical Society of America 73 4 1387 1389 1983 10.1121/1.389245
- Rao, N. Munjal, M.L. “Generalized Decoupling Method for Analyzing Perforated Element Mufflers” Proceedings of the 1984 Nelson Acoustics Conference Wisconsin (USA) July 1984
- Chang, Y.-C. Chiu, M.-C. “Shape Optimization of One-chamber Perforated Plug/Non-plug Mufflers by Simulated Annealing Method” International Journal for Numerical Methods in Engineering 74 1 1592 1620 2008 10.1002/nme.2226
- Chiu, M.-C. “Shape Optimization of Multi-chamber Mufflers with Plug-inlet Tube on a Venting Process by Genetic Algorithms” Applied Acoustics 71 6 495 505 2010 10.1016/j.apacoust.2010.01.008
- Vasile, O. Enescu, N. “The Acoustic Multi-chamber Muffler Performances” U. P. B. Sci. Bull., series D 71 3 64 74 2009
- Kirby, R. “Simplified Techniques for Predicting the Transmission Loss of a Circular Dissipative Silencer” Journal of Sound and Vibration 243 3 403 426 2001 10.1006/jsvi.2000.3425
- Torregrosa, A.J. Broatch, A. González-Contreras, F. “A Theoretical and Experimental Study of the Behaviour of Concentric Perforated Duct Automotive Mufflers.” SAE Technical Paper 960300 1996 10.4271/960300
- Kirby, R. “Transmission Loss Predictions for Dissipative Silencers of Arbitrary Cross Section in the Presence of Mean Flow” Journal of the Acoustical Society of America 114 1 200 209 2003 10.1121/1.1582448
- Davies, P.O.A.L. “The design of silencers for internal combustion engines” Journal of Sound and Vibration 1 2 185 201 1964 10.1016/0022-460X(64)90081-1
- Munjal, M.L “Acoustics of Ducts and Mufflers” John Wiley & Sons New York 0-471-84738-0 1987
- Broatch, A. “Medida de la Respuesta Acústica de Silenciadores” Universidad Politécnica de Valencia Valencia 84-7721-346-1 1995
- Singh, R. Katra, T. “Development of an Impulse Technique for Measurement of Muffler Characteristics” Journal of Sound and Vibration 56 2 279 298 1978 10.1016/S0022-460X(78)80021-2
- Payri, F. Desantes, J.M. Broatch, A. “Modified Impulse Method forthe Measurement of the Frequency Response of Acoustic Filters to Weakly Nonlinear Transient Excitations” Journal of the Acoustical Society of America 107 2 731 738 2000 10.1121/1.428256
- Mucklow, G.F. Wilson, A. J. “The Attenuation and Reflection of Compression Waves Propagated in Pipes” Proceedings of the Institution of Mechanical Engineers 169 69 80 1955
- Torregrosa, A.J. Broatch, A. Fernandez, T. Denia, F.D. “Description and Measurement of the Acoustic Characteristics of Two-tailpipe Mufflers” Journal of the Acoustical Society of America 119 2 723 728 2006 10.1121/1.2159228
- Payri, F. Broatch, A. Salavert, J.M. Moreno, D. “Acoustic Response of Fibrous Absorbent Materials to Impulsive Transient Excitations” Journal of Sound and Vibration 329 7 880 892 2010 10.1016/j.jsv.2009.10.015
- Desantes, J.M. Torregrosa, A. J. Broatch, A. Moya, D. “Development of Time-domain Models for Automotive Exhaust Mufflers” Acoustique & Techniques 31 21 26 2002
- Torregrosa, A.J. Broatch, A. Payri, R. Gonzáles, F. “Numerical Estimation of End Corrections in Extended-duct and Perforated-duct Mufflers” Journal of Vibration and Acoustics - Transactions of the ASME 121 3 302 308 1999 10.1115/1.2893980