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A stick-slip piezoelectric actuator with measurable contact force

机译：具有可测量接触力的粘贴式压电致动器

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摘要

The output performances of stick-slip piezoelectric actuators strongly depend on the contact force between the driving unit and the slider. However, quantitative measurement of the contact force is still unsolved, which brings difficulty for keeping the performance uniformity of piezoelectric actuators during mass production. To solve this problem, in this study, a cantilever beam was introduced into the driving compliant mechanism for quantitatively evaluating the contact force by means of its elastic deformation. Correspondingly, a stick-slip piezoelectric actuator with measurable contact force was developed. Its structure design and working principle were analyzed in detail, followed by characterizing the output performances under various contact forces, driving voltages, and frequencies. Furthermore, its loading capacity and motion stability were experimentally tested. The results indicated that the change in contact force would lead to the evolution in stepping characteristics between the backward motion and secondary increase in displacement, which further affected the motion speed of the actuator. Furthermore, it was observed that the contact force also significantly affected the resonant frequency of the actuator, and the increase in contact force would increase the resonant frequency. Comparative analysis demonstrated that even introducing the cantilever beam into the driving unit for measuring the contact force, the actuator could still achieve quite good output performances. For example, it could realize high speed (18.37 mm/s under the contact force of 15.54 N), relatively large loading capacity (2.7 N under the contact force of 25.90 N), as well as good motion stability. Therefore, the proposed measuring method of contact force is feasible and the corresponding actuator is applicable, which is meaningful for mass production of stick-slip piezoelectric actuators.
机译：粘滑压电致动器的输出性能强烈地取决于驱动单元和滑块之间的接触力。然而，接触力的定量测量仍然未解决，这使得难以在批量生产期间保持压电致动器的性能均匀性。为了解决这个问题，在该研究中，将悬臂梁引入驱动柔顺机构，以通过弹性变形来定量评估接触力。相应地，开发了一种具有可测量接触力的粘滑压电致动器。详细分析了其结构设计和工作原理，然后在各种接触力，驱动电压和频率下表征输出性能。此外，通过实验测试其装载能力和运动稳定性。结果表明，接触力的变化将导致踩踏运动与位移的次运动和二次增加之间的步进特性的演变，这进一步影响了致动器的运动速度。此外，观察到接触力也显着影响了致动器的谐振频率，并且接触力的增加将增加谐振频率。比较分析证明，甚至将悬臂梁引入驱动单元以测量接触力，致动器仍然可以实现相当良好的输出性能。例如，它可以实现高速（18.37mm / s在15.54 n的接触力），相对大的负载能力（在25.90n的接触力下2.7 n），以及良好的运动稳定性。因此，所提出的接触力的测量方法是可行的，并且相应的致动器是适用的，这对于粘滑压电致动器的批量生产是有意义的。

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  • 来源
    《Mechanical systems and signal processing》 |2020年第10期|106881.1-106881.13|共13页
  • 作者

    Zhi Xu; Hu Huang; Jingshi Dong;

  • 作者单位

    School of Mechanical and Aerospace Engineering Jilin University Changchun 130022 People's Republic of China;

    School of Mechanical and Aerospace Engineering Jilin University Changchun 130022 People's Republic of China Key Laboratory of CNC Equipment Reliability Ministry of Education Jilin University Changchun 130022 People's Republic of China;

    School of Mechanical and Aerospace Engineering Jilin University Changchun 130022 People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    Piezoelectric actuator; Stick-slip; Measurable contact force; Stepping characteristic; Motion stability;

    机译：压电执行器;粘滑;可测量的接触力;步进特征;运动稳定性;

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