Pages 203-204
A smart structure is composed of the piezoelectric film sensors and actuators in order to achieve the required vibration control performance. H_2 controller is designed with the reduced order model of the smart structure which is obtained by finite element and modal analyses. The control forces are applied by the piezoelectric film actuators and the feedback signals are detected by the piezoelectric film sensors or the accelerometers in the system. The modal control and the displacement control are conducted by selecting the modal coordinates and the physical displacement as the controlled response, resulting in the vibration reduction. Efficient optimization algorithm based on a two step procedure is proposed in the integrated optimization of structural shape and H_2 control system. It is analytically and experimentally verified that the enhanced performance for the vibration suppression can be achieved by the integrated optimization.
