非接触式压电作动器微位移放大机构等效刚度研究。

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
Micromachines Pub Date : 2025-08-25 DOI:10.3390/mi16090974
Huaiyong Li, Dongya Zhang, Yusheng Lin, Yue Yang, Zhiwei Shi, Chong Li
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引用次数: 0

摘要

针对传统接触式压电致动器存在机械磨损和使用寿命有限的问题,提出了一种采用压缩空气进行能量传递的非接触式压电致动器;阐述了其结构和工作原理。微位移放大机构的放大性能对作动器的工作性能有显著影响,而微位移放大机构的放大性能又与机构的刚度密切相关。建立了圆角直梁柔性铰链和微位移放大机构的数学模型。推导了计算铰链和机构等效刚度的解析方程。研究了铰链的弯曲刚度和拉伸刚度以及机构的等效刚度随关键结构参数的变化规律。分析了微位移放大机构的应力分布,评价了其结构设计的合理性和可靠性。制作了样机并进行了等效刚度试验。理论计算与实验结果基本一致,验证了刚度模型的准确性。结果表明,柔性铰链的拉伸刚度明显大于弯曲刚度,从而简化了铰链刚度模型。铰链最小厚度和梁长对机构刚度有重要影响;减少厚度或增加梁的长度降低刚度,提高位移放大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of the Equivalent Stiffness of a Non-Contact Piezoelectric Actuator's Micro-Displacement Amplification Mechanism.

To address the issues of mechanical wear and limited service life in conventional contact piezoelectric actuators, this study proposes a non-contact piezoelectric actuator employing compressed air for energy transmission; we elucidate its structure and operating principle. The working performance of the actuator is significantly affected by the amplification performance of its micro-displacement amplification mechanism, which itself is closely dependent on the mechanism's stiffness. Mathematical models for both the filleted straight-beam flexure hinge and the micro-displacement amplification mechanism are established. Analytical equations for calculating the equivalent stiffness of the hinge and the mechanism are derived. The variations in the hinge's bending stiffness and tensile stiffness, as well as the mechanism's equivalent stiffness with key structural parameters, are investigated. The stress distribution of the micro-displacement amplification mechanism is analyzed to evaluate the rationality and reliability of its structural design. A prototype is fabricated and equivalent stiffness tests are conducted. The theoretical calculation is basically consistent with the experimental results, verifying the accuracy of the stiffness model. The results show that flexure hinge tensile stiffness significantly exceeds the bending stiffness, permitting the simplification of the hinge stiffness model. Hinge minimum thickness and beam length critically affect mechanism stiffness; reducing thickness or increasing beam length lowers stiffness, boosting displacement amplification.

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来源期刊
Micromachines
Micromachines NANOSCIENCE & NANOTECHNOLOGY-INSTRUMENTS & INSTRUMENTATION
CiteScore
5.20
自引率
14.70%
发文量
1862
审稿时长
16.31 days
期刊介绍: Micromachines (ISSN 2072-666X) is an international, peer-reviewed open access journal which provides an advanced forum for studies related to micro-scaled machines and micromachinery. It publishes reviews, regular research papers and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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