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。 The axial pre-compression force is used to increase the displacement and torque of the piezoelectric bimorph. The finite element simulation of electromechanical coupling field is performed on the piezoelectric bimorph driver of a micro-aircraft. The static and dynamic characteristic. In order to verify the reliability of the system, the analytical solution is used for comparison. The results show that the combination of finite element solution and analytical solution is better. Using the above piezoelectric bimorph driver, under the action of 150V voltage and 25N axial force, the peak-to-peak driving angle is 14 ° and the driving torque is 2.4N * mm, both of which reach the piezoelectric bimorph driver without axial force 4 times more. The first-order natural frequency of 95Hz is much larger than ordinary electric steering gear, which can greatly improve the handling stability of the micro-aircraft.