System identification and active vibration control of a flexible structure

the aim of this paper is to illustrate the active control of vibration of a flexible structure using a model-based digital controller. the state-space model of the system is derived using a system identification technique known as the observer/kalman filter identification (okid) method together with eigensystem realization algorithm (era). based on the measured response of the structure to a random input, an explicit state-space model of the equivalent linear system is determined. the model is used in a linear quadratic regulator (lqr) to control the first two modes of vibration of a cantilever beam using a piezoelectric actuator/sensor pair. experimental results demonstrate the efficacy of the proposed approach.