Abstract
In this paper, a method of active control is presented for suppressing random vibration of class of flexible structures subject to both wind and seismic disturbances. It should be noted that inherently each of them has mutually different characteristics. Therefore, it is reasonable from the practical point of view to provide two types of controllers, one of which excludes the vibration due to wind disturbance and another suppresses the vibration due to seismic input. Following to the idea,the state variable is split into two parts-the one is driven by wind disturbance and the other by the seismic one. Consequently the optimal controls are obtained in the form of feedback and feedforward.
