Semiactive vibration control in a three-story building-like structure using a magnetorheological damper

Abstract

This article considers the dynamic analysis and semiactive vibration control on a building-like structure, excited on its base through an external force generated by an electromechanical shaker providing harmonic and seismic motion at the base of the overall structure. The mathematical model of the overall system is obtained using Euler-Lagrange methods, which is validated by means of experimental modal analysis techniques. In fact, the external force excites the first three (lateral) vibration modes of the building-like structure. Therefore, to suppress and/or attenuate the undesirable vibrations on the structure, it is proposed a semiactive vibration control scheme considering a Magneto-Rheological damper directly coupled between the base and the first floor. The hysteretic behavior of the Magneto-Rheological damper is modeled by means of the polynomial approach proposed by Choi-Lee-Park. Finally, a Multi Positive Position Feedback controller combined with Sliding-Mode Control techniques is synthesized, using as output the position provided by an accelerometer collocated on the first floor. Some experimental results are presented to show the dynamic performance of the overall building-like structure.