Abstract
A smart structure is composed of the piezoelectric film sensor and actuator in order to reduce the structural vibration. 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 force is applied by the piezoelectric film actuator and the feedback signals are detected by the piezoelectric film sensor and the accelerometer in the system. The vibration response is suppressed by the modal control in which the modal coordinate displacement is taken as the controlled variable. The shape/placement of the piezoelectric actuator and the H_2 control system are simultaneously optimized by SQP method and genetic algorithm to achieve an enhanced vibration control performance. Efficient optimization algorithm based on a two-step procedure is employed in the simultaneous optimization. It is verified by some applications that the enhanced performance for the vibration suppression can be achieved by the presented optimal design.
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