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PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros
Semi-Active Control of Base-Isolated Structures using a new Inverse Model of Magnetorheological Dampers
A. Bahar1, F. Pozo2, L. Acho2, J. Rodellar1 and A. Barbat3
1CoDAlab, ETSECCPB, 2CoDAlab, EUETIB, 3CIMNE, ETSECCPB,
A. Bahar, F. Pozo, L. Acho, J. Rodellar, A. Barbat, "Semi-Active Control of Base-Isolated Structures using a new Inverse Model of Magnetorheological Dampers", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 160, 2009. doi:10.4203/ccp.91.160
Keywords: magnetorheological damper, parameter identification, Bouc-Wen model, semi-active control, black box, benchmark building.
Magnetorheological (MR) dampers have received special attention as semi-active devices for mitigation of structural vibrations . Because of the inherent nonlinearity of these devices, it is difficult to obtain a reasonable mathematical inverse model. This paper is concerned with two related concepts. On one hand, it presents a new inverse model of MR dampers based on the normalized Bouc-Wen model. On the other hand, it considers a hybrid seismic control system for building structures, which combines a class of passive nonlinear base isolator with a semi-active control system. In this application, the MR damper is used as a semi-active device in which the voltage is updated by a feedback control loop. The management of MR dampers is performed in a hierarchical way according to the desired control force, the actual force of the dampers and its capacity to react. The control is applied to a numerical three-dimensional benchmark problem which is used by the structural control community as a state-of-the-art model for numerical experiments of seismic control attenuation . The performance indices show that the proposed semi-active controller behaves satisfactorily.
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