PBP压电双晶片驱动器力学特性研究

为了获得后屈曲预压缩 （PBP）驱动器的力学特性，该文通过解析模型、有限元模型及实验验证对其进行了研究，3种结果符合较好。结果表明，PBP驱动器可达到10°的输出转角峰 峰值，3倍于施加同样电压的普通压电双晶片，设计空间增大。其一截频率达到178 Hz，远高于普通微小型电动伺服舵机。该文可为PBP舵机驱动器原理样机的研制提供理论基础和实验方法。

Study for Mechanical Behavior of PBP Piezoelectric Bimorph Actuator

In order to get the static and dynamic characteristic behaviors of post buckled pre compressed (PBP) piezoelectric bimorph actuators, simplified theoretical models were established and the PBP was simulated by finite element analysis. Furthermore, an experimental apparatus and platform were set up, based on which the static, dynamic and torque measuring experiments were carried out to validate the theoretical predictions. It was shown that the experimental results and theoretical predictions were excellently correlated. Over 10° free peak to peak end rotation could be produced by the PBP actuator, which was more than three times of the available end rotation of the original bimorph under the same voltage, thus the design space of the actuator was increased significantly. The 1st natural frequency of PBP actuator reached 178 Hz, which was much higher than the bandwidth of conventional electromechanical sub scale servoactuators. The work of this paper provides theoretical basis and test methods for the development of PBP bimorph actuator prototype.