一种新型惯性式压电执行器研究

设计了一种惯性式压电执行器.该执行器由身体和4个弹性足构成.每个弹性足是一个带夹层的压电双晶片,称之为复合压电双晶片.首先阐述了该执行器惯性冲击式的运动原理;然后从热力学角度推导出复合压电双晶片悬臂梁端部挠度与外电压、外力的关系式;以此为基础建立了执行器的动力学模型,用13个设计参数如压电片的长度、宽度、高度,执行器质量和驱动电压等表征了执行器的运动状态;最后以驱动电压幅值为自变量,固定其他设计参数,得到了电压幅值与执行器平均速度的关系曲线.此理论计算与试验结果基本相符,证明所建立的执行器动力学模型是合理的.

Research on a new kind of piezoelectric actuator based on inertial principle

A new kind of piezoelectric actuator is proposed and analyzed. The actuator consists of a body and four elastic legs. Each leg consists of two piezoelectric elements attached to each other via a metal shim in between, named as a composite piezoelectric bimorph. The mechanism is based on inertial principle. Above all, the relation between the applied voltage, external force and tip deflection of the composite piezoelectric bimorph was inferred by the thermodynamics. On the basis of the results, the actuator dynamic model was established, denoting the actuator locomotive status by 13 design parameters, such as length, width and height of the piezoelectric element, actuator mass and driving voltage. At last, as an example, regarding the driving voltage amplitude as the independent variable, the relation curve between the amplitude and the actuator average velocity was obtained. The theoretical result is basically identical with that of the qualitative experiment, which proves the rationality of the dynamic model.