Abstract
Smart micro composites are designed optimally for the vibration suppression. The present smart structures are composed of graphite/epoxy (CFRP) composites and PZT actuators. Performance of vibration control strongly depends on actuator placements and modal shapes of structure. It is possible to specify vibration mode shapes for laminated composites by varying stacking combinations of angles of reinforcing fibers. In this paper, vibration control performance is maximized by optimizing fiber orientation angle, PZT actuator placement, and weight parameters in the control system simultaneously. A simple genetic algorithm method with modal database is used as an optimizer. Based on the numerical results, the experimental verification is conducted with an innovative excitation method using a laser abrasion technique. Since the pulse laser is irradiated precisely at the same position with same power repeatedly, this method makes it possible to excite micro structures with high reproducibility. Calculated results show that the optimized smart micro composite has superior performance of vibration suppression to some representative ones, and experimental results validate the present multidisciplinary optimization technique.
