基于光控压电混合驱动悬臂梁独立模态控制

提出利用镧改性锆钛酸铅(PLZT)的光电效应,将PLZT作为电动势源来驱动压电作动器,从而实现光控板壳结构的振动控制。基于光控压电等效电学模型建立了光控压电混合驱动的数学模型,并进行了实验验证。为了实现光控悬臂梁的独立模态控制,针对悬臂梁结构,设计了正交模态传感器/作动器表面电极形状函数。提出PLZT与压电作动器正/反接控制的激励策略,并结合速度反馈定光强控制的控制算法,利用Newmark-β法对不同光照强度下悬臂梁的动态响应进行了数值仿真分析。分析结果证明了所设计的模态传感器/作动器及针对光控压电混合驱动提出的控制策略的正确性。

Independent Modal Control of Cantilever Beam Based on Hybrid Photovoltaic/Piezoelectric Actuation Mechanism

In this study, the photonic control of flexible shell using hybrid photovoltaic/piezoelectric actuation mechanism is proposed. Based on the photovoltaic effect of PLZT, it is used as photovoltaic generator to drive piezoelectric actuator. The constitutive model of this novel actuation mechanism is established based on its equivalent electrical model, and it is verified by experiments. In order to realize the independent modal control of cantilever beam using hybrid photovoltaic/piezoelectric actuation mechanism, orthogonal sensors are designed, and the ON/OFF control of positive/negative connection between PLZT and piezoelectric actuator is proposed combining with constant light control algorithm based on velocity feedback. Dynamic modal control equations of the cantilever beam laminated with orthogonal actuators based on this novel photonic control method is numerically simulated using Newmark--β method. The simulation results show that the orthogonal sensors/actuators designed and control schemes proposed for this photonic method can effectively realize photonic independent modal control of cantilever beam.