This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Linear Acoustic Modelling using 1-D Flow Systems which represent Complex 3-D Components
Technical Paper
2011-01-1524
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Acoustics of automotive intake and exhaust systems have been modelled very successfully for many years using 1D gas dynamic simulations. These use pseudo 3D models to allow complex components to be constructed from simple building blocks. In recent years, tools have appeared that automate the construction of network models from 3D geometries of intake and exhaust components. Using these tools, concurrent noise and performance predictions are a core part of most engine development programmes. However, there is still much interest in the more traditional field of linear acoustics: analysing the acoustic behaviour of isolated components or predicting radiated noise using a linear source. Existing approaches break the intake and exhaust system down into a set of components, each with known acoustic properties. They are then connected together to create a network that replicates the donor non-linear model. A new approach is used whereby the exact same network representation is used for both linear and non-linear analysis of the model. Each modelling element in the non-linear model directly corresponds to an element in the linear model. There is no prior knowledge of the intention of the geometry (resonator, etc). The acoustic behaviour is an output (measured) rather than an input (assumed). The core of this new approach is the conversion of complex 1-D flow networks to their acoustic equivalents. Comparisons of predicted transmission loss between full non-linear simulations and the new linear model show close agreement for a large range of auto-meshed 3D components.
Recommended Content
Authors
Citation
Amphlett, S., Niven, P., Payri, F., and Torregrosa, A., "Linear Acoustic Modelling using 1-D Flow Systems which represent Complex 3-D Components," SAE Technical Paper 2011-01-1524, 2011, https://doi.org/10.4271/2011-01-1524.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
- Torregrosa, A. J. Broatch, A. Bermúdez, V. Andrés, I. 2005 Experimental assessment of emissions models used for IC engine exhaust noise prediction Experimental Thermal and Fluid Science 30 2 97 107
- Payri, F. Torregrosa, A. J. Broatch, A. Moya, D. 2003 Predictive modelling applied to exhaust system development Proc. 2 nd Styrian Noise, Vibration & Harshness Congress Graz (Austria)
- Ferrari, G. Castelli, R. 1985 Computer predictions and experimental tests of exhaust noise in a single cylinder internal combustion engine Noise Control Engineering Journal 24 2 50 56
- Jones, A. D. Brown, G. L. 1982 Determination of two-stroke engine exhaust noise by the method of characteristics Journal of Sound and Vibration 82 3 305 327
- Mayer, K. P. Nowotny, B. 1981 Ein Berechnungsverfahren für Abgasschalldämpfer von Viertaktmotoren MTZ Motortechnische Zeitschrift 42 10 391 396
- Payri, F. Torregrosa, A. J. Chust, M. D. 1996 Application of MacCormack schemes to I. C. engine exhaust noise prediction Journal of Sound and Vibration 195 5 757 773
- Sapsford, S. M. Richards, V. C. M. Amlee, D. R. Morel, T. Chappell, M. T. 1992 Exhaust system evaluation and design by non-linear modeling SAE Paper 920686
- Selamet, A. Dickey, N. S. Novak, J. M. 1995 A time-domain computational simulation of acoustic silencers Journal of Vibration and Acoustics - Transactions of the ASME 117 323 331
- Desantes, J. M. Torregrosa, A. J. Broatch, A. Moya, D. 2002 Development of time-domain models for automotive exhaust mufflers Acoustique et Techniques 31 21 26
- Onorati, A. 1997 Nonlinear fluid dynamic modeling of reactive silencers involving inlet/outlet and perforated ducts Noise Control Engineering Journal 45 35 51
- Torregrosa, A. J. Broatch, A. Payri, R. “The Use of Transfer Matrix for the Design of Interferencial Systems in Exhaust Mufflers,” SAE Technical Paper 2000-01-0728 2000 10.4271/2000-01-0728
- Davies, P. O. A. L. 1997 Predictive acoustic modelling applied to the control of intake/exhaust noise of internal combustion engines Journal of Sound and Vibration 202 249 274
- Desantes, J. M. Torregrosa, A. J. Broatch, A. 1995 Hybrid linear/nonlinear method for exhaust noise prediction SAE Transactions - Journal of Engines 104 1012 1020
- Payri, F. Desantes, J. M. Torregrosa, A. J. 1995 Acoustic boundary condition for unsteady one-dimensional flow calculations Journal of Sound and Vibration 188 1 85 110
- Morel, T. Morel, J. Blaser, D. A. “Fluid Dynamic and Acoustic Modeling of Concentric-Tube Resonators/Silencers,” SAE Technical Paper 910072 1991 10.4271/910072
- Bodén, H. Åbom, M. 1995 Modelling of fluid machines as sources of sound in duct and pipe systems Acta Acustica 3 549 560
- Ih, J.-G. Peat, K. S. 2002 On the causes of negative impedance in the measurement of intake and exhaust noise sources Applied Acoustics 63 153 171
- Silva, F. Guillemain, P. Kergomard, J. et al 2009 Approximation formulae for the acoustic radiation impedance of a cylindrical pipe Journal of Sound and Vibration 322 255 263
- Payri, F. Torregrosa, A. J. Payri, R. 2000 Evaluation through pressure and mass velocity distributions of the linear acoustical description of I.C. engine exhaust systems Applied Acoustics 60 4 489 504
- Denia, F. D. Albelda, J. Fuenmayor, F. J. Torregrosa, A. J. 2001 Acoustic behaviour of elliptical chamber mufflers Journal of Sound and Vibration 241 3 401 421
- Selamet, A. Denia, F. D. Besa, A. J. 2003 Acoustic behavior of circular dual-chamber mufflers Journal of Sound and Vibration 265 5 967 985
- Ji, Z. L. Selamet, A. 2000 Boundary element analysis of three-pass perforated duct mufflers Noise Control Engineering Journal 48 5 151 156
- Broatch, A. Margot, X. Gil, A. 2005 A CFD approach to the computation of the acoustic response of exhaust mufflers Journal of Computational Acoustics 13 2 301 316
- Glav, R. Åbom, M. 1997 A general formalism for analyzing acoustic 2-port networks Journal of Sound and Vibration 202 5 739 747
- Munjal, M. L. 1987 Acoustics of ducts and mufflers Wiley