Abstract
In the vibration control of flexible structures, the closed-loop system may be unstable by exciting higher modes which are neglected in the design. In this paper, we discuss a design method of robust controller of a flexible bridge based on the normalized left coprime factorization approach. We show that this method is simple and straightforward to reflect the control objectives such as robustness and performance, on the design. And the validity of the controller is confirmed by some experiments. We also show that this controller has the same structure as a full state observer and the selection of observer gain has a very important role in the design of robust controller.
