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2005, 9

I. Grushetsky, A. Smol’nikov

Comparison of FEM and SEA for vibration computing in periodic structures

language: English

received 15.03.2005, published 31.03.2005

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ABSTRACT

Some examples of vibration energy computing in beams structure using Finite Element Method (FEM) and Statistical Energy Analysis (SEA) are presented. Calculations are carried out for periodic structure, that consists of equal beams and of beams whose lengths are random variables with equal mean value and some deviation. The later case is real one, when the dimensions of structure elements are not known exactly but are specified as a mean value and some tolerance. It is shown that the beams energies, calculated by FEM, in structure consisting of equal beams and beams, whose lengths are random variables with equal mean value, are different. Thus FEM computation which uses solely mean characteristics can be inaccurate. Difference between average FEM and SEA results is not significant. It is concluded that SEA – less expensive method – is quite suitable for practical engineering computing.

10 pages, 9 figures

Сitation: I. Grushetsky, A. Smol’nikov. Comparison of FEM and SEA for vibration computing in periodic structures. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2005, 9.

REFERENCES

1. Lyapunov V. T., Nikiforov A. S. Vibration isolation in ship structures. Leningrad, “Sudustroenie” 1975. (In Russian).
2. L. Cremer, M. Heckl, E. E. Ungar. Structure-Borne Sound, 2nd edition, Springer, Berlin, 1988.
3. Nikiforov A. S. Noise control of ship structures. Leningrad, “Sudustroenie” 1990. (In Russian)


 

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)