椭圆横断截面新型双轴柔性铰链设计及分析

doi:10.3969/j.issn.1004-132X.2024.08.002

摘要/Abstract

摘要： 现有同位正交复合缺口双轴柔铰存在矩形横断截面锐边结构，增大了应力集中效应，且无法通过优化纵向缺口轮廓来消除。为此，提出一类椭圆横断截面新型双轴柔铰。首先以圆弧缺口为对象，构建该类柔铰的参数化结构模型；然后基于卡氏第二定理建立其柔度及最大应力理论模型，通过有限元分析验证模型的有效性，基于此，实现了柔度及应力集中特性分析；最后通过实验测试验证了柔铰的柔度性能。结果表明，椭圆横断截面型双轴柔铰具备两向各异柔度，可从本质上避免锋利锐边结构，降低应力集中效应，与具有相同缺口结构的矩形横断截面型双轴柔铰相比，工作能力可提高47.9%，该类柔铰结构拓展了现有缺口型柔铰的基本类型。

关键词: 柔性铰链, 柔性机构, 椭圆横断截面, 双轴柔性铰链

Abstract: Two-axis flexure hinges with orthogonally-collocated notches comprised rectangular transverse cross-sections which increased the stress concentration on the sharp edges. In addition, such effects could not be avoided through notch optimization. Consequently, a novel kind of two-axis flexure hinge with elliptical transverse cross-sections was developed herein. Firstly, the parametric model of the flexure hinges with circular notches was established. Then, the compliance and stress models of the flexure hinges were developed based on the Castiglianos second theorem. The analytical models were verified through finite element analyses and the parametric simulations were performed to evaluate the characteristics of compliances and stress concentration. Finally, the compliances of a flexure specimen were tested through experiments. The results show that the ETC flexure hinges have two-dimensional anisotropic compliances. The sharp-edge structures are avoided. Therefore, the stress concentration effects are reduced and the motion capability is increased. Compared to exiting two-axis flexure hinges with identical notch profiles but rectangular transverse cross-sections, the motion capability of the ETC type flexures hinges is increased by 47.9%. The ETC type two-axis flexure hinges expand the design spaces of the primary flexure structures.

Key words: flexure hinge, flexure mechanism, elliptical transverse cross-section(ETC), two-axis flexure hinge

中图分类号:

TH122

魏华贤1, 2, 赵永杰2, 杨楠2, 王奉涛2, 牛小东2. 椭圆横断截面新型双轴柔性铰链设计及分析[J]. 中国机械工程, 2024, 35(08): 1348-1357.

WEI Huaxian1, 2, ZHAO Yongjie2, YANG Nan2, WANG Fengtao2, NIU Xiaodong2. Design and Analyses of a Novel Two-axis Flexure Hinge with Elliptical Transverse Cross-sections[J]. China Mechanical Engineering, 2024, 35(08): 1348-1357.

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链接本文: http://www.cmemo.org.cn/CN/10.3969/j.issn.1004-132X.2024.08.002

http://www.cmemo.org.cn/CN/Y2024/V35/I08/1348

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