| A method for simultaneous optimization of smart structures considering conventional structure topology, smart material layout and control strategy is presented. Smart structure design typically focuses on either the actuator/sensor, actuator/controller, or sensor/controller features. In this work, all the features of the structure are considered simultaneously, including (1) actuator, (2) sensor, (3) control law, and (4) structure topology to achieve optimum performance. The use of smart structures with embedded PVDF sensors and PZT actuators are employed for active vibration suppression. A simultaneous optimization methodology is described and applied to increase the stability margin of the closed-loop system. Both simulation and experimental results show that feedback gains and control efficiency of the optimal closed-loop design are improved as compared to the system with a nominal design. Structural optimization, piezoelectric sensors/actuators, optimization algorithms, and control systems are evaluated and characterized. The feasibility of a new class of segmented distributed modal sensors/actuators in measuring/actuating physical displacement of piezoelectric structures has been successfully demonstrated. Specific design cases are used to illustrate the benefit of the approach. |
