Control of Structures using Active Tuned Mass Damper

5.1 Tuned mass Damper (TMD) as an added energy-absorbing system is one of the available methods of passive and active structural control by tuning of the building’s natural frequency and absorbing part of the input energy, thereby reducing possible structural damage. The concept of TMD has been implemented in a number of countries including the United State and Japan for a variety of structures.In this research, the seismic performance of the passive and active controlled structures is studied and compared with that of uncontrolled structures. The properties of the added mass (tuning mass, tuning frequency and tuning damping ratio) are varied widely to obtain the optimum values that minimize the objective cost function. The objective cost function in the passive control depends mainly on the structural response, while in the active control, where there is a control force, the objective cost function depends on the structural response and the control force with different participation weighting coefficients. The influence of changing these weighting coefficients is investigated in details to accommodate the optimum weighting coefficients. Single, three, ten and thirty story buildings were studied. The optimum linear control strategy is adopted and used in this research