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The Use of Transfer Matrix for the Design of Interferencial Systems in Exhaust Mufflers
Technical Paper
2000-01-0728
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
SAE 2000 World Congress
Language:
English
Abstract
One of the main problems in the design of exhaust silencers is the attenuation of low frequency noise. At these frequencies is where the influence of the engine has more importance; moreover, low frequency noise has the possibility of interaction with the mechanical resonances of the exhaust line, producing additional noise and vibration highly disturbing. A suitable solution to this problem is the use of the interferencial behaviour between two acoustic parallel paths, which produces high attenuation at a given frequency associated with the difference between the acoustic lengths of both paths. In the present paper, a general expression for the 4-pole transfer matrix of an interferencial system with two arbitrary branches is presented, which is applied to a simple but realistic exhaust silencer. Results are compared with the transmission loss measured with a modified impulse method, with good agreement between the model and the measurements.
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Torregrosa, A., Broatch, A., and Payri, R., "The Use of Transfer Matrix for the Design of Interferencial Systems in Exhaust Mufflers," SAE Technical Paper 2000-01-0728, 2000, https://doi.org/10.4271/2000-01-0728.Also In
References
- JONES, A.D. 1984 Modelling the exhaust noise radiated from reciprocating internal combustion engines -A literature review Noise Control Engineering Journal 23 1 12 31
- BRUGGEMAN, J.C. 1995 Flow noise in exhaust systems Schalldämpfer und Abgasanlagen bei Kraftfahrzeugen Haus der Technik Essen
- DESANTES, J.M. TORREGROSA, A.J. BROATCH, A. 1995 Hybrid linear/nonlinear method for exhaust noise prediction SAE Paper 950545
- ERIKSSON, L.J. 1982 Silencers BAXA, D.E. Noise control in internal combustion engines New York John Willey & Sons 237 292
- Selamet, a. dickey, n. S. novak, j. M. 1994 The Herschel-Quinke tube: A theoretical, computational, and experimental investigation Journal of the Acoustical Society of America 96 5 3177 3185
- MUNJAL, M.L. 1987 Acoustics of ducts and mufflers New York John Willey & Sons
- BROATCH, A. Medida de la respuesta acústica de silenciadores
- SELAMET, A. RADAVICH, P. M. 1995 The Effect of Length on the Acoustic Attenuation Performance of Concentric Expansion Chambers: An Analytical, Computational, and Experimental Investigation SAE Paper 950544
- DAVIES, P.O.A.L. 1988 Practical flow duct acoustics Journal of Sound and Vibration 124 1 91 115
- PAYRI, R. 1999 Ánalisis de la atenuación acústica producida por filtros acústicos: SÍntesis y modelado de silenciadores de escape
- Torregrosa, a. broatch, a. payri, r. Gonzalez, f. 1999 Numerical Estimation of End Corrections in Extended-Duct and Perforated-Duct Mufflers Journal of Vibration and Acoustics - Trans. ASME 121 3 302 308
- DAVIES, P.O.A.L. 1997 Acoustic modelling of multiple path silencers with experimental validations Journal of Sound and Vibration 202 2 195 225