Sensor/Actuator Optimal Design for Active VibrationControl of Shell Structure

In this paper, a distributed sensor and actuator are designed for the active vibration control of shell structure. To prevent the adverse effect of spillover, distributed modal sensorlactuator system is established by optimizing the electrode pattern and the lamination angle of polyvinylidene fluoride (PVDF). Finite element programs are developed to consider the curved structures integrated with PVDF sensor and actuator. The nine-node Mindlin shell element is used for finite element discretization. The electrode pattern and the lamination angle of PVDF sensor/actuator are optimized using genetic algorithm. The sensor is designed to minimize the observation spillover. and actuator is designed to minimize the system energy of the control modes under a given initial condition. For the verification of the design, numerical simulation and real-time vibration control experiment ofthe integrated smart structure are performed using discrete LQG method as the control law. A singly curved cantilevered smart shell structure integrated with distributed modal sensor/actuator for the suppression of the first and second modes is manufactured for the experiment. The vibration suppressions of control modes are successfully achieved as expected.