Modified Optimal Linear Control of Seismic Structures

A modified optimal linear control algorithm for the active control of structures is developed in the discrete-time formulation. Since the environmental loads and disturbances are not measured during real-time control, they are not involved in the derivation of the control algorithm, so that the controller is a proportional feedback of current state. In this paper the new modified optimal linear control of structures is presented. Using a logical assumption, the unmeasurable disturbances are considered in the state space equation and also in the derivation of the control algorithm, so that the controller is a combination of the control force in the last step and the proportional feedback of states in two last steps. Hence, the control performance of the modified control algorithm is superior to that of the original one. The feasibility and effectiveness of the proposed control algorithm is verified through frequency-domain and time-domain analysis, and compared with the original one. The tendon control system of a three-degree-of-freedom structure is illustrated to demonstrate the control effectiveness of the modified control algorithm.

کلیدواژه ها:

Optimal control ، Active ، Structural dynamics ، Earthquake