中文摘要：

在特定波长的高能光束均匀照射下,镧改性锆钛酸铅（PLZT）铁电陶瓷由于在光电效应及逆压电效应的共同作用下会产生光致伸缩效应,可以实现对智能结构的非接触式精密激励。提出一种新的光致伸缩作动器的构型设计,它由4个单片的PLZT作动器构成,由于每一片的不均衡的边界条件,此新型作动器可以产生不均匀的控制力及控制力矩,利用变分法计算出其控制力及控制力矩的近似分布曲线,利用模态扩展方法,分别计算此新型作动器对正方形板及矩形板的模态控制效果,计算作动器尺寸对控制效果的影响。通过与多自由度作动器的对比表明,此新型作动器由于会产生不均匀的控制力及控制力矩使它对板的某些模态的控制效果比多自由度作动器更好。

英文摘要：

Based on the photovoltaic effect and the converse piezoelectric effect,the lanthanum-modified lead zirconate titanate （PLZT） actuator exhibits a photostrictive effect when subjected to certain wave-length light illuminations.Thus,it can be used for non-contact precision excitation and vibration control of smart structures,e.g.,shells and plates.In order to improve the control effectiveness,a new actuator design which consists of four regions of PLZT actuator is proposed and evaluated.Due to its polarized direction and uneven boundary conditions of each region,this new actuator can induce non-uniform control forces and moments.Based on the variation method,the approximate distribution curves of the control forces and moments are calculated.Modal control effects of this new actuator on rectangle and square plates are calculated respectively by using the modal expansion method.The influence of actuator size on control effect is also calculated.The comparison between the control effects of this new actuator and those of a multi-DOF actuator shows that due to the non-uniform control moments,the new actuator induces better modal control effects on certain plate modes than those of the multi-DOF actuator.