含金属芯压电纤维的驱动特性研究

Reseach on characterization of actuator of metal piezoelectric fiber

针对含金属芯压电纤维这种新型驱动器的确定特性,建立了悬臂杆结构含金属芯压电纤维驱动器的理论模型。根据第一类压电方程,推导出了自由端位移、夹持力和纵向共振频率的解析表达式,分析了金属芯性能和半径对这3个参数的影响;并把理论计算结果和有限元分析结果进行了比较。通过实验测量了自由端位移和夹持力。理论和实验结果表明,这种驱动器端部有较小的位移1.8μm、较大的夹持力150 mN、较高的一阶共振频率25.21 kHz。

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.