CAE Based Approach to Understand a Behavior of Vibro-Acoustic System
In this paper, a CAE based approach to understand a behavior of vibro-acoustic system is introduced. The sound pressure at an evaluation point in an enclosure can be described by inner product of (i)an acoustic transfer function from coupling surface to the evaluation point, and (ii)a structural vibration on the coupling surface. By addition of (iii)the correlation angle between above (i) and (ii), the sound pressure can be exactly estimated. In this paper, the correlation (iii) is called Vibro- Acousitc Coupling Factor (VAC). Using VAC, it is possible to understand not only the radiation efficiency, but also the interference of sound at the evaluation point. The proposing method explains the behavior of vibro-acoustic system using the frequency response of (i), (ii) and (iii). As an example, the proposing method is applied to FE model for improving the vibroacoustic characteristic.
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- 1.Donders, S. Hermans, L. Nauwelaerts, E. Chojin, S. Pluymers, B. Desmet, W., CAE Technologies for Efficient Vibro-Acoustic Vehicle Design Modification and Optimization, Proc. ISMA 2008, pp. 4127-4142, Leuven, Belgium, September 15-17, 2008.Google Scholar
- 2.MSC software, MSC.Nastran Reference Manual 2001, pp580.Google Scholar
- 3.R.Freymann, Dynamic Response of Coupled Structural-Acoustic Systems, Journal of Low Frequency Noise and Vibration, Vol.14, No.1, 1995.Google Scholar
- 4.Michel Tournour, Luc Cremers and Pierre Guisset, Inverse Numerical Acoustic Based on Acoustic Transfer Vectors, Proc. ICSV-7, pp.221-229, Jul. 2000Google Scholar