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建立了悬臂梁结构半电极含金属芯压电纤维新型压电弯曲驱动器的理论模型。根据第一类压电方程,推导出自由端位移、夹持力和弯曲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。实验结果表明,悬臂梁结构半电极含金属芯压电纤维弯曲驱动器的自由端位移可达589μm,夹持力可达427μN,一阶弯曲共振频率为28 Hz,有限元分析结果和理论值基本吻合,说明这种驱动器有较大的端部位移、较小的夹持力和较低的弯曲共振频率。
A theoretical model of a new type of piezoelectric bending actuator with semi-electrode and metal-core piezoelectric fiber with cantilever structure was established. Based on the piezoelectric equations of the first kind, analytical expressions of free end displacement, clamping force and bending resonance frequency are deduced. The influence of metal core performance and radius on these three parameters is analyzed. The theoretical calculation results and finite element analysis The results were compared. The experimental results show that the free end displacement of the cantilever semi-electrode metal-core piezoelectric fiber bending actuator can reach 589μm, the clamping force can reach 427μN, the first-order bending resonance frequency is 28 Hz, and the finite element analysis basically agrees with the theoretical value , Shows that this drive has a larger end displacement, smaller clamping force and lower bending resonance frequency.