Based on the method, the axis pre-stress was used to improve piezoelectric bimorph driver displacement and torque, the electromechanical coupling field FEM simulation of some Micro Air Vehicle' s piezoelectric bimorph driver was made and static and dynamic characteristic curves under different axial forces and voltage loads were obtained accordingly. In order to verify the reliability of the FEM solution, the comparison between FEM solution and analytical solution was made and the results show that: the FEM and analytical solutions are in good conformity; and a 14° peak-to—peak deflection and a 2.4N* mm torque of this type of piezoelectric bimorph driver are obtained under 150V voltage and 25N axial force, four times bigger than that without axis per-stress piezoelectric bimorph. Its nature frequency is 95H2, which is much larger than that of the electromechanical actuator, significantly enhancing the maneuverability and stability of Micro Air Vehicle.%研究轴向预压缩力增大压电双晶片驱动位移及力矩问题,对某微型飞行器的压电双晶片驱动器进行了机电耦合场有限元仿真,得到在不同轴向力及电压作用下的静动态特性.为了验证系统可靠性,采用解析解进行比较,结果表明:有限元解和解析解复合较好.采用上述压电双晶片驱动器,在150V电压及25N轴向力的作用下,驱动转角峰峰值为14°,驱动力矩为2.4N* mm,都达到未施加轴向力的压电双晶片驱动器的4倍以上.一阶固有频率为95Hz远大于普通电动舵机,可大幅提高微型飞行器的操稳性.
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