中文摘要：

本文回顾了压电尺蠖作动器的发展历史并重点介绍了一种LEF型大推力直线压电作动器,并对其工作原理和应用前景进行了详细的介绍.该型大推力作动器结构紧凑,具有大行程、大推力、断电自锁、耐磨的特点,其输出推力可达5.6 kN.该型作动器可应用于无人机中,通过该作动器来控制机翼的收缩,从而控制无人战机的速度,将显著提高无人战机完成作战任务的效率.

英文摘要：

The state of the art of the inchworm actuators was reviewed and the piezoelectric linear actuatorswith large thrust were introduced with thick and heavy colors in this paper. Among them, the operation prin-ciple and the application prospect of a LEF piezoelectric actuator was detail introduced. The LEF piezoelec-tric actuator can be applied in the unmanned combat aircraft vehicle （UCAV） for its outstanding characteris-tics of compact structure, long stroke, large thrust, insensitivity to wear and a rigid power-off self-lockingstate. The wing＇s shape can be changed by the actuator to control the speed of the UCAV. Thus, the combatefficiency of the UCAV can be greatly improved.