Reseach on characterization of actuator of metal piezoelectric fiber

BIAN Yi-xiang1， QIU Jin-hao2
（1. College of Mechanical Engineering， Yangzhou University， Yangzhou 225127， China；  2. Key Lab of Smart Materials and Structures，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China）

Abstract： Aiming at the description of the characteristics of metal core piezoelectric fiber（MPF） actuator，the mechanical mode of the new type actuator was established. According to the constitutive piezoelectric equations，the analytical expressions of the tip displacement，the blocking force and the natural frequencies were derived. The effect of the diameter and Young's modulus of the metal core on these properties were investigated based on the analytical equations. And the results were compared with those of the finite element method. The tip displacement and blocking force were measured experimentally. Analytical and experimental results indicate that the actuator can give a small displacement as 1.8 μm，a big blocking force as 150 mN ，and a high first mode resonance frequency as 25.21 kHz.
Key words： metal core； piezoelectric fiber； piezoelectric actuator