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A Comparison of Test-Based and Analytic SEA Models for Vibro-Acoustics of a Light Truck
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Abstract
A number of researchers [3],[4] have shown that Statistical Energy Analysis[1] provides a useful framework for test-based noise path analysis - as well purely analytical models. This paper describes the results of a comparative study of two such models - an analytic SEA model and a test-based SEA parameter model - for predicting the Noise Reduction performance of a light truck body.
First, the different power balance matrix solutions and SEA subsystem definitions are reviewed. Second the results of the two independent models are compared. For some specific cases of structure-borne noise, the test-based method is shown to be more accurate than the analytic model. Third, means by which individual measured SEA parameters can be integrated into an analytic SEA model are proposed and evaluated. Results indicate that the scope for analytical model improvement, but also highlight the need for more rigorous “consistency” in the way test-based SEA parameters are measured.
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Chen, H., O'Keefe, M., and Bremner, P., "A Comparison of Test-Based and Analytic SEA Models for Vibro-Acoustics of a Light Truck," SAE Technical Paper 951329, 1995, https://doi.org/10.4271/951329.Also In
References
- Lyon, R. H. DeJong R.G. Theory and Application of Statistical Energy Analysis 2nd Butterworth-Heinemann 1995
- Clifton, S. M. et. al. “AutoSEA User Guide” Vibro-Acoustic Sciences Publication No. ASEA-010 Jan. 1992
- Bies, D. Hamid S. “In Situ Determination of Loss and Coupling Loss Factors by the Power Injection Method,” JSV 70 2 187 204 1980
- Lalor, N. “The Experimental Determination of Vibrational Energy Balance in Complex Structures,” Paper No. 108429 Proc. SIRA Conf. on Stress and Vibration London 1989
- Lalor, N. Sato K. “Measurement of Statistical Energy Analysis Parameters by a Transient Test Method,” UNSW-A&VC Course Notes “The Basics of Statistical Energy Analysis” Canberra July 1993
- Kasper, P. et. al. “Correlated System Model for F150 Noise and Vibration,” Vibro-Acoustic Sciences Report No. CS005-TR003 Ford Motor Company July 1993
- Lalor, N. Stimpson, G. “Results of SEA Testing and Force/Noise Transfer Function Measurements on a [Light Truck]” ISVR Report Ford Motor Company Nov. 1993
- “[Light Truck] Operating SPL Measurements Report” Ford Motor Company Project No. 93010 Dec. 1992