作者：郑星, 凌明祥, 刘谦, 严侠

作者单位：中国工程物理研究院总体工程研究所, 四川 绵阳 621999

关键词：压电陶瓷;位移放大机构;振动;动态应变

摘要：

为监测压电陶瓷驱动器并联驱动时各自的动态输出状态，利用压电陶瓷驱动器中位移放大机构的菱形对称结构建立全桥应变测量方法，通过位移放大机构菱边在振动过程中的动态应变变化来反映压电陶瓷驱动器的工作状态。对不同状态下位移放大机构菱边的动态应变进行实验研究，结果表明：利用位移放大机构对称菱边建立的全桥应变测量方法能够有效获取位移放大机构在振动过程中的动态应变变化，且能够对位移放大机构的运行状态进行实时监测，在带负载和不带负载情况下，设计的位移放大机构菱边在振动过程中的应变量级都在几个微应变，该测量结果也反映出设计的位移放大机构刚度较好，能够保证压电陶瓷驱动器有较好的输出性能。

Dynamic strain measurement of rhombus displacement magnification mechanism for piezoceramic actuator
ZHENG Xing, LING Mingxiang, LIU Qian, YAN Xia
Institute of Systemic Engineering, China Academy of Engineering Physics, Mianyang, 621999, China
Abstract: In order to monitor the dynamic output state of multiple piezoelectric actuators in parallel drive, a full bridge strain measurement method was established by using the rhombus symmetrical structure of displacement amplification mechanism in piezoelectric actuator. The working state of piezoelectric actuator is reflected by the dynamic strain change of rhombus edge of displacement amplifier during vibration. The dynamic strain of rhombus edge of displacement amplifier under different states is studied experimentally. The results show that the full bridge strain measurement method based on the symmetrical rhombus edge of the displacement amplification mechanism can effectively obtain the dynamic strain of the displacement amplification mechanism during the vibration process, and can monitor the operation state of the displacement amplification mechanism in working. In the case of load and no load, the strain of the rhombus edge of the designed displacement amplifier is several micro-strains in vibration. The measurement results also reflect that the stiffness of the designed displacement amplifier and the output performance of the piezoelectric actuator is good.
Keywords: piezoelectric ceramics;displacement amplification mechanism;vibration;dynamic strain
2019, 45(1):56-59  收稿日期: 2018-06-13;收到修改稿日期: 2018-08-20
基金项目: 国家自然科学基金青年基金项目（51705487）
作者简介: 郑星(1987-),男,贵州凤冈县人,工程师,硕士,主要从事环境试验及测试技术研究
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