科创中国

原文链接：万方

• 摘要：

  Straight-line compliant mechanisms are important building blocks to design a linear-motion stage,which is very useful in precision applications.However,only a few configurations of straight-line compliant mechanisms are applicable.To construct more kinds of them,an approach to design large-displacement straight-line flexural mechanisms with rotational flexural joints is proposed,which is based on a viewpoint that the straight-line motion is regarded as a compromise of rigid and compliant parasitic motion of a rotational flexural joint.An analytical design method based on the Taylor series expansion is proposed to quickly obtain an approximate solution.To illustrate and verify the proposed method,two kinds of flexural joints,cross-axis hinge and leaf-type isosceles-trapezoidal flexural(LITF)pivot are used to reconstruct straight-line flexural mechanisms.Their performances are obtained by analytic and FEA method respectively.The comparisons of the results show the accuracy of the approach.Both examples show that the proposed approach can convert a large-deflection flexural joint into approximate straight-line mechanism with a high linearity that is higher than 5 000within 5 mm displacement.This can lead to a new way to design,analyze or optimize straight-line flexure mechanisms.

• 关键词：

  flexure mechanism straight-line mechanism flexural joint center-shift

• 作者单位：

  School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China

• 基金项目：

  National Natural Science Foundation of China(Grant51275552)%Foundation for the Author of National Excellent Doctoral Dissertation of China(Grant201234)

• 来源期刊：

  中国机械工程学报

• 年，卷(期)：

  201427001