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Hybrid Technique for Underbody Noise Transmission of Wind Noise
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 17, 2011 by SAE International in United States
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Wind noise has become an important indicator for passenger automobile quality. Several transmission paths can be related to different parts of the vehicle exterior. While the greenhouse (side glasses, windshield, seals & others) often dominates the interior noise level above 500 Hz, the contribution coming from the underbody area usually dominates the interior noise spectrum at lower frequencies. This paper describes a framework of numerical tools which is capable of determining realistic underbody turbulent and acoustic loads being generated for typical driving conditions, as well as performing the noise transmission through underbody panels and the propagation of sound to the drivers ear location. Different numerical tests are performed to demonstrate the ability of a Statistical Energy Analysis model updated with Finite Element Method properties to predict accurately the noise transmission through the underbody of simplified car vehicle in the mid frequency range under aero acoustic excitation. Parameters of the hybrid technique and the use of finite element modeling to estimate them are discussed. Transfer function comparisons between pure FEM and the hybrid technique are performed involving various load types to demonstrate the consistency of these methods. Cabin sound pressure level comparison for a simplified vehicle with wind noise excitation shows good correlation to FEM calculations performed with adequate statistical treatment. In addition, sensitivity analysis for several underbody parameters involving stiffness, mass, damping and geometry design change is applied to show further the utility of the technique for wind noise design.
|Technical Paper||An Engineering Approach to Sound Quality|
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|Technical Paper||Collins & Aikman Technical Centre|
CitationMoron, P., Hazir, A., Crouse, B., Powell, R. et al., "Hybrid Technique for Underbody Noise Transmission of Wind Noise," SAE Technical Paper 2011-01-1700, 2011, https://doi.org/10.4271/2011-01-1700.
- Moron, P., Powell, R., Freed, D., Perot, F. et al., “A CFD/SEA Approach for Prediction of Vehicle Interior Noise due to Wind Noise,” SAE Technical Paper 2009-01-2203, 2009, doi:10.4271/2009-01-2203.
- Lepley, D., Graf, A., Powell, R., and Senthooran, S., “A Computational Approach to Evaluate the Vehicle Interior Noise from Greenhouse Wind Noise Sources,” SAE Technical Paper 2010-01-0285, 2010, doi:10.4271/2010-01-0285.
- Lyon, R.H. and DeJong, R.G., Theory and Application of Statistical Energy Analysis, Butterworth-Heinemann, Newton, Massachusetts, 1995.
- SEAM Reference Manual, Cambridge Collaborative, Inc., Cambridge, Massachusetts, 2007
- Crouse et al, “Numerical Investigation of Underbody Aeroacoustic Noise of Automobiles”, SAE Paper 2007-01-2400, 2007.
- Manning, J., “Formulation of SEA parameters using mobility functions”, Transactions of the Royal Society of London, Vol. 346, No. 1681, pp. 477-488, 1994.
- Manning, J., “SEA Model to predict structure-borne Noise in Vehicles”, SAE Technical Paper 2003-01-1552, 2003.
- Manning, J., “Use of measured Mobility to improve SEA predictions in the mid frequency range”, Proceeding of DETC 99: 17th ASME Biennial Conference on Mechanical Vibration and Noise, Las Vegas, Nevada, Sept 12-15, 1999.
- Dynamic Analysis User's Guide Nastran, MD., MSC Software Corporation, 2010
- Shan, X., Yuan, X.F. and Chen, H., “Kinetic theory representation of hydrodynamics: a way beyond the Navier-Stokes equation”, J. Fluid Mech., Vol. 550, pp. 413-441, 2006.
- Shock, R., Mallick, S., Chen, H., Yakhot, V. and Zhang, R., “Recent simulation results on 2-D NACA airfoils using a lattice Boltzmann based algorithm.”, AIAA J. of Aircraft, Vol. 39(3), pp. 434-439, 2002.
- Chen, S. and Doolen, G., “Lattice Boltzmann Method for Fluid Flows.”, Ann. Rev. Fluid Mech., Vol. 30: p. 329-364, 1998.
- Chen, H., Teixeira, C. and Molvig, K., “Digital Physics Approach to Computational Fluid Dynamics, Some Theoretical Feature”, Int. J. Mod. Phys. C, 8 (4), p. 675, 1997
- Senthooran, S. et al, “Prediction of wall pressure fluctuations on an automobile side-glass using a lattice-Boltzmann method”, AIAA Paper 2006-2559, Cambridge, Massachusetts, 2006.
- Senthooran, S., Crouse, B., Balasubramanian, G., Freed, D.M., “Effect of Surface Mounted Microphones on Automobile Side Glass Pressure Fluctuations.”, 7th MIRA Conference, 2008.
- Bies, D. and Hansen, C., “Engineering Noise Control: Theory and Practice,” Figure 8.6, 3rd edition, Spon Press, New York, ISBN 0-415-26714-5, 2003.