Structure Design of S-type Foldable Flexible Hinges

Abstract

Abstract: According to principles of flexure hinge series and parallel relationship, a S-type foldable flexible hinge was designed in order to reduce flexibility and get a larger corner of the flexible hinges. Using pseudo rigid-body method and energy method, the stiffness model of S-type flexure hinges was deduced. By ANSYS, a finite element model of the flexible hinges was built, and the stiffness and stress analyses of the S-type hinges were carried out. It is found that the stiffness of errors are about 3% by comparing the simulation values and theoretical values. As a result, the stiffness model of S-type flexure hinges is proved right. When the rotational degrees about the flexure hinge are up to ±35°, the safety of factor is as 4. So the S-type foldable flexible hinges fully meet the design requirements.

Key words: flexure hinge, pseudo-rigid-body method, energy method, equivalent stiffness, finite element analysis

摘要： 为了减小柔性铰链的转动刚度，依据串并联关系，设计了S形折叠式柔性铰链。使用伪刚体法和能量法，建立了S形柔性铰链的刚度模型。利用ANSYS建立了该柔性铰链的有限元模型，对铰链进行了刚度和应力分析，并将其与理论值进行了比较，得到刚度误差约为3%，验证了刚度模型的准确性。当转角达到最大值±35°时，安全系数为4，符合设计要求。

关键词: 柔性铰链, 伪刚体法, 能量法, 等效刚度, 有限元分析

CLC Number:

TH122

YAN Kai1,2,3;ZHANG Jing1,2,3;KOU Ziming1,2,3. Structure Design of S-type Foldable Flexible Hinges[J]. China Mechanical Engineering.

闫凯1,2,3;张静1,2,3;寇子明1,2,3. S形折叠式柔性铰链结构设计[J]. 中国机械工程.

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