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Guidelines on the Use of Experimental Sea for Modeling and Understanding Road Noise in Cars
Technical Paper
1999-01-1704
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Over the last years, SEA has been recognized as a useful tool to model and analyze the high-frequency vibro-acoustic behavior of fully assembled complex structures. This paper discusses the experimental derivation of the loss factor model of a passenger car. The paper outlines the different steps which need to be taken to obtained a fully validated experimental SEA model. This includes the subdivision into subsystems, the PIM measurement campaign, the derivation of the loss factors and their associated confidence levels and the model validation. The paper further details how the experimental SEA model was used to quantify and investigate the airborne and structure-borne contributions to the interior noise level for a road noise test condition. The operational power inputs to the vehicle were indirectly determined from operational response measurements. A contribution analysis showed that airborne noise sources dominated structure-borne noise sources above 500Hz. A sensitivity study allowed to propose an effective design modification. This modification was implemented and successfully tested on the road.
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Authors
Citation
Hermans, L. and Iadevaia, M., "Guidelines on the Use of Experimental Sea for Modeling and Understanding Road Noise in Cars," SAE Technical Paper 1999-01-1704, 1999, https://doi.org/10.4271/1999-01-1704.Also In
References
- Fahy J.F. Statistical Energy Analysis: A Critical Overview Phil. Trans. R. Soc. Lond. A 346 431 447 1994
- Kompella M.S. Bernhard R.J. Measurement of the statistical variation of structural-acoustic characteristics of automotive vehicles Proc. of SAE 65 81 Michigan 1993
- Lyon R.H. “Statistical Energy Analysis of Dynamical Systems: Theory and Practice” MIT Press Cambridge 1975
- Parrett A. V. Hicks J. K. Burton T.E. Hermans L. “Statistical Energy Analysis of Airborne and Structure-borne Automobile Interior Noise” Proc. of SAE Traverse City 1997
- Fingberg U. Bharj T. Cimerman B. “High-Frequency NVH Optimization Using Energy Techniques” Proc. of ISMA 21 conference Leuven 1996
- Bies D.A. Hamid S. “In situ determination of loss and coupling loss factors by the power injection method Journal of Sound and Vibration” 70 2 187 204 1980
- De Langhe K. High Frequency Vibrations: Contributions to Experimental and Computational SEA Parameter Identification Techniques Department of Mechanical Engineering KUL Leuven 1996
- Fahy F.J. Statistical Energy Analysis International Seminar on Applied Acoustics Leuven 1993
- Lalor “Practical considerations for the measurements of internal and coupling loss factors on complex structures” ISVR Technical Report No. 182 June 1990
- Hermans L. De Langhe K. Demeestere L. Methods to Estimate the Confidence Level of the Experimentally Derived Statistical Energy Analysis Model: Application to Vehicles Proc. of SAE 1997
- Lalor N. “The experimental determination of vibrational energy balance in complex structures” Proc. SIRA Conference on Stress and Vibration - Recent Developments in Industrial Measurements and Analysis London 1989
- Kraniauskas P. “Transforms in Signals and Systems” Addison-Wesley Publishing Company 1992
- Schroeder M.R. “New Method of Measuring Reverberation- Time” Acoustical Society of America 409 412 1965
- Hermans L. “On the Influence of the Subsystem Mass or Volume in Experimental Statistical Energy Analysis” Proc. Inter-Noise 97 Budapest August 1997
- Smith P.W. Statistical models of coupled dynamical systems and the transition from weak to strong coupling Journal of the Acoustical Society of America 65 695 698 1979
- Hermans L. Wyckaert L, K. “Experimental Statistical Energy Analysis: Internal and Coupling Loss Factor Matrix Validation” Proc. Inter-noise 96 Liverpool July-August 1996
- Hermans L. Iadevaia M. Experimental SEA Modelling of a Family Car: The Indirect Determination of Operatoinal power inputs Proc. of Noise-Con98 Ypsilanti, Michigan 1998
- Lalor N. Stimpson G “FEM+SEA+Optimisation = Low noise” Proc. ATA Conference on Vehicle Comfort Bologna 1992
- Van der Linden P.J.G. “Omnidirectional volume velocity point sources: how can they be approximated” Proc. of Inter-Noise 97 Budapest August 1997