An Experimental Study on Active Vibration Suppression of Composite Structures
复合材料层板构件气弹振动控制实验研究

The vortex induced buffeting loads on aircraft may cause high cyclic strain and stress in aircraft composite structure and lead to composite delamination. To simulate the active vibration suppression for such composite structures, an experimental system is designed, where collocated piezoeletric sensors/actuators are bonded to the surfuce of a composite cylindrical shell, and the maximum determinant of Fisher Information Matrix criteria is used to arrange the piezoelectric network. With sine and square acoustic fields as exciting source and with the filtered adaptive control algorithm to control the deformation of the actuators, a close loop control is established to minimize the selexted vibration modes of the cylindrical shell. Experiments on the system show that the selected modes can be suppressed effectively but higher modes are also excited and lead to significant noise radiation which should be treated carefully in future research.