复合材料层板构件气弹振动控制实验研究

飞机局部复合材料构件存在着因涡流作用诱发的弹性振动问题。本文首先研究了表面粘贴型压电元件对复合材料构件的传感和驱动原理；针对结构待控模态的要求，采用了D-准则优化确定同位压电传感/驱动器在构件中的布置方案；应用自适应振动前馈控制原理和方法，构造了闭环控制系统；分别利用正弦和方波信号激发气动声场，对玻纤/环氧圆筒构件进行激振和振动控制实验；结果表明：构件主要待控模态的振动得到了有效抑制，但也出现了高阶模态被激发的问题，导致结构辐射噪声上升。

An Experimental Study on Active Vibration Suppression of Composite Structures

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.