Observer Based Semiactive Control of Structures Using Mr Dampers

Abstract eng:
MR damper is a semi-active control device used effectively to control the response of building frames for earthquakes. In most practical situations, it is not possible to take response measurements from all degrees of freedom and use them for developing feedback control algorithm to be used for actuating the MR dampers.Therefore, observer based control strategies are to be developed. Herein, an observer-based control algorithm is developed for semi-active control of building frames using MR dampers for stochastic control. The algorithm is developed using Kalman filter, LQG algorithm and clipped optimal control. The control of a ten storey building frame is achieved by employing a maximum number of 3 MR dampers and three displacement measurement locations employed strategically in the building frame. Locations of the MR dampers and measurement locations are determined using the genetic algorithm. The measurements are provided as feedback information to the control algorithm. The controlled responses of interest are the top storey displacement, maximum drift and the base shear of the frame. These three response quantities are determined for a number of real and artificial earthquakes. The artificial earthquakes considered are oftwo types, one broadband and the other narrowband. The results of the study suggest that; (i) the degree of control of the response quantities of interest varies with the earthquakes (ii) for the numerical problem solved here, the optimal locations of the dampers remain same for all the three response quantities of interest and for all earthquakes (iii) optimal locations of observations vary with the response quantities of interest and earthquakes. Therefore, no unique solution exists for the overall good performance of a partially observed controlled structure.

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