Modeling, Analysis and Experiments of a Three-dimensional Bridge-type Mechanism with Combined Flexure Hinges

doi:10.3901/JME.2018.13.110

Abstract

Abstract: To solve the issue of low amplification ratio for the compliant bridge-type mechanism, a three dimensional bridge-type mechanism with combined flexure hinges is proposed, which not only remains the superiority of the conventional bridge-type mechanisms, e.g., structure symmetry, compact size and simple design, but also achieves high amplification ratio. To analyse the performance of the 3D bridge-type mechanism, the statics model is established via the compliance matrix method, based on which a new evaluation index, the relative amplification rate is proposed to measure the displacement loss of the mechanism. Several 3D bridge type mechanisms with three frequently used flexure hinges are analysed by the established model. The results show that the 3D bridge-type mechanism reaches the optimal performance when the V-shaped hinge and the filled leaf hinge are employed in bridge 1 and bridge 2 respectively. Finally, a bridge-type mechanism with amplification ratio of 41 and relative amplification rate of 0.9 is confirmed by FEA simulation and experiments.

Key words: bridge type mechanism, compliance matrix method, flexure hinges, relative amplification rate

CLC Number:

TG156

CHEN Fangxin, GAO Futian, DU Zhijiang, SUN Lining, DONG Wei. Modeling, Analysis and Experiments of a Three-dimensional Bridge-type Mechanism with Combined Flexure Hinges[J]. Journal of Mechanical Engineering, 2018, 54(13): 110-116.

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