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Amortissement semi-actif des structures flexibles

Othman Ben Mekki 
Abstract : Tuned mass dampers (TMDs) have obtained an important success in civil engineering. Since their performance depends on the choice of its parameters and evolutions of the structure to be controlled may pull down the efficiency of this kind of device. In this work we achieved a semi-active version based on electromechanical device. This semiactive version consists in a pendulum coupled at an alternator. When pendulum begins to oscillate, the alternator converts the mechanical energy into electric energy to be dissipated through an exterior resistor via Joule effect. Four points have been mainly developed in this work. ² The first point is devoted to obtaining an optimal design of a passive actuator using an optimization criteria. This criteria is based on the maximization of the exponential time decay rate by means of the pole placement technique. Numerical simulations have shown the actuator efficiency and the importance of their optimal parameters in absorbing the torsional mode of small-scale bridge under construction when it is in free vibration or also in harmonic vibration. ² The second point studies the multimodal vibration damping of the demonstrator bridge equipped with multiple actuators. In particular, three actuators have been used for control the first vertical mode, the torsional mode, the third mode and the sixth mode of vibrations of the demonstrator bridge. ² The third point consisted in developing the semi-active control law that permits to adapt the actuator parameters in real-time when the structure evolves. This semi-active control law consists in changing the resistor in real-time in such a way to lock the apparent stiffness of the real TMD at its desired optimal value and to vary the damping coefficient. ² The last point deals with the experimental study of the passive control and the semi active control on a small-scale bridge. In passive control, the theory of optimal design of the actuator parameters has been validated and the efficiency of the electromechanical actuator has been confirmed. In semi-active control, only the advantage of the actuator in such a way to make its performance independent of the structural evolution has been validated.
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Submitted on : Monday, June 25, 2007 - 8:00:00 AM
Last modification on : Monday, June 25, 2007 - 8:00:00 AM
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  • HAL Id : pastel-00002570, version 1



Othman Ben Mekki. Amortissement semi-actif des structures flexibles. Engineering Sciences [physics]. Ecole des Ponts ParisTech, 2006. English. ⟨pastel-00002570⟩



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