earticle

영어

The effectiveness of vibration control using Linear Quadratic Gaussian(LQG) method applied in the base isolated building is investigated. The robust stability of the closed loop system measured by phase and gain margin is also studied to verify its demerit. Since the base isolated building exhibits the largest relative displacements in the base isolator, the control target is to reduce them by aid of the LGQ method. The closed loop control system consists of an actuator located in the base isolated floor and an observer.
The observer used to estimate all the states, floor displacements in this case, based on the measured state is found to be the most effective when located in the base isolated floor. The results indicated that the LGQ hybrid control method using only one measured displacement suppressed effectively the relative displacement in the base isolated floor compared to the responses from Linear Quadratic(LQ) control method where all the states should be measured. This LQG control system, however, loses all the system stability margin and robustness due to the Kalman filter adapted in its algorithm.