光控压电混合驱动特性及影响因素分析

The Characteristic and Influence Factors Analysis of Non-contact Hybrid Photostrictive/Piezoelectric Acutation Mechanism

提出光控压电混合驱动,即利用铁电陶瓷镧改性锆钛酸铅(PbLa Zr Ti,PLZT)在紫外光照射下产生的光电压驱动压电作动器。这种新型光控方式的研究实现了PLZT作动器的非接触激励、抗电磁干扰的光激励特性与压电作动器响应速度快等优势互补。基于等效电学模型建立了在光-热-力-电等多能耦合作用下,压电作动器驱动电压及应变的本构模型;对作动器应变滞后性进行试验分析并与PLZT作动器进行了对比;对光控压电混合驱动的影响因素进行研究,探讨了光照强度、作动器电极表面面积、厚度等尺寸参数对作动器驱动电压的影响规律。

The hybrid photovoltaic/piezoelectric actuation mechanism is proposed. The ultraviolet light-driven PbLaZrTi（PLZT） induced photovoltages are used to drive piezoelectric actuators. The novel actuation mechanism can realize the advantages complementary of non-contact actuation, immune from electric and magnetic disturbances of PLZT and high respond speed of piezoelectric actuators. Based on the equivalent electrical model, constitutive model is established to define the time history of actuation voltages and strain of piezoelectric actuator. Experimental analysis and comparison of strain hysteresis between this new actuation mechanism and PLZT actuator are carried out. The influence factors of this new actuation mechanism are studied. The influences of light intensity and piezoelectric actuator electrode surface area and thickness on the actuation voltages of piezoelectric actuator are investigated.