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Transfer Matrix Computation for Intake Elements with Large Pressure Fluctuations under Mean Flow Conditions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2012 by SAE International in United States
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A new methodology for modeling engine intake has been presented; it is based on a transfer function relating pressure response and mass flow rate that makes use of the corresponding frequency spectrum obtained on the so-called “dynamic flow bench”. This new approach provides a way to obtain fast and robust results, which take into account all the phenomena inherent to compressible unsteady flows. Recently the potential of this method has been explored by incorporating it in a GT-Power model to produce a coupled frequency - time domain simulation of a naturally aspirated engine. The method exhibited promising results.
One strategy utilized to combat the increasingly stringent emissions standards and reduce fuel consumption is to employ downsized turbocharged engines equipped with charge air coolers (CAC). Therefore, research and development must focus not only on naturally aspirated engines but also on turbocharged ones. Simulating such engines with the transfer function methodology is quite difficult, and identifying the transfer function of an air intake line with a CAC and turbocharger requires mounting it on the “dynamic flow bench”, which becomes impossible due to thermal and thermodynamic discontinuities. It is therefore necessary to split the intake line into separate elements, which leads us to transfer matrices.
In this work, a new method was developed to determine the transfer matrix across a simple element, it is capable to deal with any large pressure fluctuations and mass flow rates like the ones encountered on any engine without specific parameterization. It allows reconstruction of the matrix from a non-steady response to a nearly impulse excitation using the dynamic flow bench. Once the transfer matrix for a simple tube is calculated, it is validated by placing the corresponding tube in a GT-Power model of a single cylinder engine intake line.
In conclusion, the perspectives of such a technique are presented. It will allow the calculation of transfer matrices of a more complex system (CAC) intended to be later used for engine simulation purposes.
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CitationMezher, H., Migaud, J., Chalet, D., Raimbault, V. et al., "Transfer Matrix Computation for Intake Elements with Large Pressure Fluctuations under Mean Flow Conditions," SAE Technical Paper 2012-01-0672, 2012, https://doi.org/10.4271/2012-01-0672.
- TO, C.W.S. DOIGE, A.G. “A transient testing technique for the determination of matrix parameters of acoustic systems, I: Theory and principles” Journal of Sound and Vibration 62 2 207 222 1979
- TO, C.W.S. DOIGE, A.G. “A transient testing technique for the determination of matrix parameters of acoustic systems, II: Experimental procedures and results” Journal of Sound and Vibration 62 2 223 233 1979
- TO, C.W.S. DOIGE, A.G. “The application of transient testing methods to the determination of acoustic properties of unknown system” Journal of sound and Vibration 71 4 545 554 1980
- MUNJAL, M L. “Acoustics of Ducts and Mufflers with application to exhaust and ventilation system design” John Wiley & Sons 1987
- Davies, P.O.A.L. Practical flow duct acoustic Journal of Sound and Vibration 124 1 91 115 1988
- Davies, P.O.A.L. HARRISON, M.F. “Predictive Acoustic modeling Applied to the Control of Intake/Exhaust Noise of Internal Combustion Engines” Journal of Sound and Vibration 202 2 249 274 1997
- GIBIAT, V. LALOË, F. “Acoustical Impedance Measurements by the Two-Microphone-Three-Calibration (TMTC) Method” Acoustical Society of America 6 2533 2544 1990
- GLOAGUEN, F. LEFEBVRE, A. GUILAIN, S. GIBIAT, V. “Measurement of the acoustic impedance of engine intake systems with the TMTC method. Reflection functions associated with discontinuities” 4th acoustical European meeting Forum Acusticum Budapest, Hungry 2005
- RODRIGUEZ, S. GIBIAT, V. LEFEBVRE, A. GUILAIN, S. “The three-measurement two-calibration method for measuring the transfer matrix” Journal Acoustic Society of America 2011 May 129 5 3056 67
- Ohata, A. Ishida, Y. “Dynamic Inlet Pressure and Volumetric Efficiency of Four Cycle Four Cylinder Engine,” SAE Technical Paper 820407 1982 10.4271/820407
- Matsumoto, I. Ohata, A. “Variable Induction Systems to Improve Volumetric Efficiency at Low and/or Medium Engine Speeds,” SAE Technical Paper 860100 1986 10.4271/860100
- Tao, Z. Seybert, A. “A Review of Current Techniques for Measuring Muffler Transmission Loss,” SAE Technical Paper 2003-01-1653 2003 10.4271/2003-01-1653
- MUNJAL, M.L. DOIGE, A.G. “Symmetry of One-Dimensional Dynamical Systems in Terms Of Transfer Matrix Parameters” Journal of Sound and Vibration Academic Press Limited 163 3 467 475 1990
- PAYRI, F. DESANTES, J.M. BROATCH, A. “Modified impulse method for the measurement of the frequency response of acoustic filters to weakly nonlinear transient excitations” Acoustical Society of America 107 2 2000
- HARRISON, M.F. DE SOTO, I. RUBIO UNZUETA, P. “A linear acoustic model for multi-cylinder IC engine intake manifolds including the effects of the intake throttle” Journal of Sound and Vibration 278 975 1011 Journal of Sound and Vibration 975 1011 2004
- HARRISON, M.F. STANEV, P.T. “A linear acoustics model for intake wave dynamics in IC engines” Journal of Sound and Vibration 269 1 361 387 2004
- HARRISON, M.F. DUNKLEY, A. “The acoustics of racing engine intake systems” Journal of Sound and Vibration 271 3 959 984 2004
- Fontana, P. Huurdeman, B. “A New Evaluation Method for the Thermodynamic Behavior of Air Intake Systems,” SAE Technical Paper 2005-01-1136 2005 10.4271/2005-01-1136
- BROOME, D. “Induction ram. Part 1, the inertia and waves effects” Automobile engineer 130 133 April 1969
- Mahé, A. Migaud, J. Chalet, D. Hétet, J. “Comparison Between Two Experimental Characterization Setups of Unsteady Behavior of Internal Combustion Engine Intake Systems,” SAE Technical Paper 2008-01-0674 2008 10.4271/2008-01-0674
- MAHE, A. “Caractérisation du comportement non-stationnaire du système d'admission d'air d'un moteur à combustion interne. Incidence sur le remplissage” PhD thesis Ecole Centrale de Nantes 2011
- MUNJAL, M.L. DOIGE, A.G. “The Two-Microphone Method Incorporating The Effects Of Mean Flow And Acoustic Damping” Journal Of Sound And Vibration 137 1 135 138 1990
- CORMERAIS, M. CHALET, D. HETET, J.F. MIGAUD, J. HUURDEMAN, B. “A New Accurate 1D Modeling Method for the Air Intake Line Based on 3D Geometry” 2010
- CHALET, D. MAHE, A. HETET, J.F. MIGAUD, J. “A new modeling approach of pressure waves at the inlet of internal combustion engines” Journal of Thermal Science 20 2 181 188 10.1007/s11630-011-0455-8 2011
- CHALET, D. MAHE, A. MIGAUD, J. HETET, J.F. “A frequency modeling of the pressure waves in the inlet manifold of internal combustion” Applied Energy 88 9 2988 2994 0306-2619 10.1016/j.apenergy.2011.03.036 2011
- WINTERBONE, D.E. PEARSON, R.J. “Theory of Engine Manifold Design: Wave Action Methods for IC Engines” Professional Engineering Publishing 2000
- BRUNEAU, M. “Manuel d'acoustique fondamentale” Paris Hermes 2-86601-712-9 1264-4692 1998