基于四杆机构单元的柔性铰链设计与尺寸优化

doi:10.7527/S1000-6893.2017.421283

材料工程与机械制造

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基于四杆机构单元的柔性铰链设计与尺寸优化

张静, 寇子明

太原理工大学机械工程学院, 太原 030024

收稿日期:2017-03-27 修回日期:2017-07-20 出版日期:2017-11-15 发布日期:2017-07-20
通讯作者: 张静 E-mail:free1985216@163.com
基金资助:
国家自然科学基金（51505319）；太原理工大学校基金（2014TD040）；太原理工大学人才引进基金（tyut-rc201448a）

Design and size optimization of flexible hinge based on unit of four-link linkage

ZHANG Jing, KOU Ziming

College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received:2017-03-27 Revised:2017-07-20 Online:2017-11-15 Published:2017-07-20
Supported by:
National Natural Science Foundation of China (51505319); Special/Youth Foundation of Taiyuan University of Technology (2014TD040); Qualified Personnel Foundation of Taiyuan University of Technology (tyut-rc201448a)

摘要/Abstract

摘要：

针对柔性铰链存在的转动角度小和径向漂移大等问题，进行了大转角和高精度柔性铰链设计。利用四杆机构中曲柄摇杆机构的转角放大特性，以固化的四杆机构为变形模块，通过摇杆的小变形实现铰链的大转角运动。柔性铰链中固化的四杆机构为超静定结构，基于超静定结构理论进行了柔性单元的受力分析，并建立了柔性铰链的刚度模型，实现柔性铰链的分析和设计。根据设计方案选取设计变量，基于理论推导得到刚度建立目标函数，根据性能和几何边界建立约束条件，利用遗传算法对柔性铰链尺寸进行优化，并通过ANSYS进行了特定尺寸下柔性铰链变形和应力分析，验证了优化结果的正确性。

关键词: 柔性铰链, 四杆机构, 大转角, 刚度, 优化

Abstract:

Small rotation angle and big center-shift are the main problems of flexure hinges. To solve these problems, the flexible hinge with big angle and high precision is designed. Using the characteristics of angle amplification of the crank rocker mechanism of the four-link linkage, the articulated points of the linkage are fixed. The fixed four-bar linkage is taken as the deformation module. By using the small deformation of the rocker in the four-link linkage, motion of large rotational angle of the flexible hinge is realized. The fixed four-bar linkage in the flexible hinge is a statically indeterminate structure. Based on the theory of statically indeterminate structure, deformation and stress analysis of the flexible unit is conducted. The stiffness model for the flexure hinge is given. The objective function is derived based on the stiffness model, and the design variables and constraints are defined. The size of the flexure hinge is optimized by using the genetic algorithm. Analysis of the deformation and stress of a specific size of the flexible hinge using ANSYS software validates correctness of the optimization results.

Key words: flexible hinge, four-link linkage, large rotational angle, stiffness, optimization

中图分类号:

V474
TH122

张静, 寇子明. 基于四杆机构单元的柔性铰链设计与尺寸优化[J]. 航空学报, 2017, 38(11): 421283-421283.

ZHANG Jing, KOU Ziming. Design and size optimization of flexible hinge based on unit of four-link linkage[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(11): 421283-421283.

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E-mail：hkxb@buaa.edu.cn

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基于四杆机构单元的柔性铰链设计与尺寸优化

Design and size optimization of flexible hinge based on unit of four-link linkage

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