Electronic Journal Technical Acoustics ISSN 1819-2408

I. Grushetsky, A. Smol’nikov

FEM application for calculation of coupling loss factors used in SEA, L-shaped beams case

language: English

received 15.04.2004, published 20.05.2004

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ABSTRACT

The way for coupling loss factors (CLF) determination consisting in finite element method (FEM) simulating of coupled subsystems is presented. The feature of the way is the energy in subsystem remote from energy source is fully dissipated in this subsystem. CLF determination was performed for two beams coupled at right angle. Calculating results agree with well known analytical solution for such a junction of semiinfinite beams. Applying CLF derived from FEM simulating, vibration energy of structure like "stairs" composed of four beams was calculated by statistical energy analysis (SEA), used here under the name of energy method (EM), (approximate method) and by FEM (exact method). Exact and approximate results agree well in octave frequency bands containing two or more resonance frequencies of the structure.

10 pages, 6 figures

Сitation: I. Grushetsky, A. Smol’nikov. FEM application for calculation of coupling loss factors used in SEA, L-shaped beams case. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2004, 6.

REFERENCES

1. C. Hopkins. Statistical energy analysis of coupled plate systems with low modal density and low modal overlap. JSV. 2002, V. 251, No 2, pp. 193–214.
2. C. Simmons. Structure-borne sound transmission through plate junctions and estimates of SEA coupling loss factors using the finite element method. JSV. 1991, V. 144, pp. 215–227.
3. L. Cremer, M. Heckl, E. E. Ungar. Structure-Borne Sound, 2nd edition, Springer, Berlin, 1988.

		Igor V. Grushetsky , PhD, Krylov Shipbuilding Research Institute (St. Petersburg, Russia). Scientific area - noise and vibration measurements and control. e-mail: editor(at)ejta.org
		Andrey V. Smol’nikov - expert on computing of vibration and sound radiation of complex structures, Krylov Shipbuilding Research Institute (St. Petersburg, Russia)