20808 System Identification and Robust Control for Flexible Structures

This paper deals with a vibration control system for a flexible three-story structure with H-infinity controller and surface bonded PZT (lead zirconium titan ate) patches. The plant transfer function is identified by Time Based Prediction Error Method. As a reference model, plant frequency responses given by Experimental Modal Analysis are used to improve the performance of the identified function. We designed H-infinity robust controller based on the identified plant. We implemented the control system by software and hardware to evaluate the performance. The experiments result in significant decays of two modes with our control system. The decay of first mode is 22 dB and the second mode is 15 dB. And, this system is applied using the finite element method.