Acceleration feedback control of seismic structures

摘要

The essential feedback signals for direct output feedback control are limited to velocities and direct acceleration feedback control is found to be unfeasible even though accelerometers are favorable sensors from the viewpoint of measurement. In this paper, acceler- ation feedback control becomes feasible when the feedback data is extended to cover accelerations of the previous time--steps. A multi-step acceleration feedback control algorithm is derived through an optimization process such that a certain prescribed quadratic performance index is minimized. Control forces are sim- ply generated from acceleration information of the current and pre- vious time-steps. The feasibility of the proposed control algorithm is verified numerically by the tendon control of structures subjected to real earthquake excitation. The control effectiveness of the pro- posed control algorithm is close to that of state feedback control algorithm. Simple on-line calculation and availability of acceler- ometers make the proposed control algorithm favorable to real- time control implementation.