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Research Papers: Mechanisms and Robotics

The Stiffness Model of Leaf-Type Isosceles-Trapezoidal Flexural Pivots

[+] Author and Article Information
Pei Xu

Robotics Institute, Beihang University, Beijing, 100083, P.R.C.peixu@me.buaa.edu.cn

Yu Jingjun

Robotics Institute, Beihang University, Beijing, 100083, P.R.C.jjyu@buaa.edu.cn

Zong Guanghua

Robotics Institute, Beihang University, Beijing, 100083, P.R.C.ghzong@buaa.edu.cn

Bi Shusheng

Robotics Institute, Beihang University, Beijing, 100083, P.R.C.ssbi@buaa.edu.cn

J. Mech. Des 130(8), 082303 (Jul 11, 2008) (6 pages) doi:10.1115/1.2936902 History: Received June 15, 2007; Revised February 22, 2008; Published July 11, 2008

A leaf-type isosceles-trapezoidal flexural pivot can be of great practical use for designing compliant mechanisms. The analysis of load-deflection behavior for such a pivot is essential to the study of the mechanisms that are comprised of them. Based on the analysis of a single special loaded leaf segment, a pseudo-rigid-body four-bar model is proposed. The four-bar model is further simplified to a pin-joint model for some simple applications. The accuracy of both models is demonstrated by comparing results to those of nonlinear finite element analysis. At last, the two models are applied to analyze the cartwheel hinge as an example.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Complex flexures. (a) Cross-axis pivot; (b) LITF pivot; (c) cartwheel hinge.

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Figure 2

The analytic model of a LITF pivot

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Figure 3

The equivalent relationship between a LITF pivot and a four-bar model

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Figure 4

The analytical model for a single leaf segment

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Figure 5

The PRB model for Case I loading

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Figure 6

The PRB model for case II loading

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Figure 7

The equivalent relationship between a LITF pivot and a pin-joint model

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Figure 8

Comparisons of results when angular displacement varying

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Figure 9

Comparisons of results when h varying

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Figure 10

The PRB models of a cartwheel hinge

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Figure 11

Comparisons of results for cartwheel hinge

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