This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Experimental Investigation on the Predictability of Exhaust Noise for Feedforward Active Control on a Two-Cylinder Diesel Engine
Annotation ability available
Sector:
Language:
English
Abstract
The exhaust noise of a two-cylinder four-stroke diesel engine was experimentally investigated in order to examine the predictability of the exhaust noise to be reduced by a feedforward active control system. Special attention has been paid to the low frequency characteristics of the exhaust noise as low frequency noise is difficult to reduce with a conventional muffler but effective to control by active control technique. The periodicity of the exhaust noise was examined with the ensemble-average and ensemble-standard deviation of the exhaust pressure signals. The results showed that the exhaust noise investigated was basically quasi-periodic and its variation between cycles was acceptable with an adaptive control algorithm. The properties of the exhaust pressure in low frequency domain were analyzed with the spectra of the exhaust noise pressure. A method to estimate the instantaneous exhaust noise pressure proposed by the author in 1996 was applied to this diesel engine by estimating a limited number N of low frequency harmonics in terms of engine speed and load. This method matches the active control system by its fast response. The predicted and experimental results agree well and show that the prediction method is valid and the exhaust noise pressure is predictable with this method.
Authors
Citation
Hong, G., "Experimental Investigation on the Predictability of Exhaust Noise for Feedforward Active Control on a Two-Cylinder Diesel Engine," SAE Technical Paper 982690, 1998, https://doi.org/10.4271/982690.Also In
References
- Benson, R.S. Annand W.J.D. Baruah, P.C. “A simulation model including intake and exhaust systems for a single-cylinder four-stroke cycle spark ignition engine,” Int. J. Mech. Sci. 17 97 124 1975
- Coates, S.W. Blair, G.P. “Further studies of noise characteristics of internal combustion engine exhaust systems” SAE 740713 1974
- Davies, P.O.A.L. “Realistic model for predicting sound propagation in flow duct systems” Noise Control Engineering Journal 40 1 135 141 January-February 1993
- Davies, P.O.A.L. “Piston engine intake and exhaust system design” J. of Sound and Vibration 190 4 677 712 1996
- Desmons, L. Hardy, J. Auregan, Y. “Determination of the acoustical source characteristics of an internal combustion engine by using several calibrated loads” J. of Sound and Vibration 179 5 869 878 1995
- Ferrari, G. Gastelli, R. “Computer prediction and experimental tests of exhaust noise in a single cylinder internal combustion engine” Noise Control Engineering Journal 24 2 50 56 1985
- Hong, G. Eager, D. “Acoustic properties of a single-cylinder engine exhaust” Proceedings of Australian Acoustical Society Annual Conference Brisbane, Australia November 1996
- Hong, G. “Prediction of exhaust pressure pulses for active control of exhaust noise on a small SI engine” SAE 972083, JSAE 9734160, Proceedings SETC'97 95 100 Yokohama, Japan October 1997
- Jones, A.D. “Modeling the exhaust noise radiated from reciprocating internal combustion engines-a literature review” Noise Control Engineering Journal 23 1 July-August 1984
- Jones, A.D. Van Moorhem, W.K. Voland, B.T. “Is a full nonlinear method necessary for the prediction of radiated engine exhaust noise?” Noise Control Engineering Journal 26 2 March-April 1986
- Prasad, M.G. Crocker, M.J. “Acoustical source characterization studies on a multi-cylinder engine exhaust system” J. of Sound and Vibration 90 4 479 490 1983
- Selamet, A. Yonak, S.H. Novak, J.M. Khan, M “The effect of vehicle exhaust system components on flow losses and noise in firing spark-ignition engines” SAE 951260 1995
- Winterbone, D.E. “Wave action simulation models” in The Thermodynamics and Gas Dynamics of Internal-Combustion Engines II Horlock J.H. Winterbone D.E. Clarendon Press Oxford 1986
- Winterbone, D.E. Worth, D Nichols, J.R. “A comparison of synthesis and analysis models for wave action manifolds” IMechE 1989