Maio 2014 vol. 1 num. 1 - 10th World Congress on Computational Mechanics

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ANALYSIS OF STABILITY CONDITIONS OF A SLENDER BEAM UNDER WIND EFFECTS USING NUMERICAL MODEL

Král, R. ; Náprstek, J. ;

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The paper deals with a numerical analysis of an aero-elastic system wherein the flow-structure interaction is taking place in its entire complexity. It is addressed to flowinduced vibrations and other response types termed as flutter or divergence, which arise due to fluctuating fluid forces and movement of the vibrating body. These phenomena are investigated on two different types of a slender beam cross-section. This strategy enables to model the body as a double-degree of freedom (DDOF) system. The paper demonstrates a determination of aero-elastic behavior of the body before and within the critical state. The attention is paid to the elastic stiffness, damping and other DDOF system parameters influence on the type and shape of aero-elastic stability limits. The question of aero-elastic stability with regard to external disturbances is discussed as well. The relevant bifurcation points and hysteresis in response loops as functions of the wind speed are identified. A separation curve emerges within the hysteresis loop dividing the space into trivial and post-critical regimes. The results obtained using numerical approach are described and widely interpreted physically. Extensive comparison with results obtained by both (i) analytical investigation and (ii) wind tunnel experiments is presented.

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Palavras-chave: Stability conditions, Aero-elastic response, Flutter.,

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DOI: 10.5151/meceng-wccm2012-18243

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Como citar:

Král, R.; Náprstek, J.; "ANALYSIS OF STABILITY CONDITIONS OF A SLENDER BEAM UNDER WIND EFFECTS USING NUMERICAL MODEL", p. 1022-1040 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-18243

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