Design of Compliant Straight-line Mechanisms Using Flexural Joints
Design of Compliant Straight-line Mechanisms Using Flexural Joints
复制标题
使用弯曲关节的柔顺直线机构设计
DOI：
10.3901/cjme.2014.01.146
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发表时间：
2014-01-01
影响因子：
4.2
通讯作者：
Bi Shusheng
中科院分区：
文献类型：
--
作者：
Pei Xu;Yu Jingjun;Bi Shusheng
直线柔性机构是设计直线运动平台的重要组成部分，在精密应用中非常有用。然而，只有少数配置的直线柔性机构是适用的。为了构造更多类型的旋转弯曲关节，提出了一种设计大位移旋转弯曲关节的直线弯曲机构的方法，该方法将直线运动视为旋转弯曲关节的刚性和柔性寄生运动的折衷。提出了一种基于泰勒级数展开的解析设计方法，以快速求得近似解。为了说明和验证所提出的方法，采用两种弯曲关节，交叉轴铰和叶型等腰梯形弯曲（LITF）枢轴对直线弯曲机构进行重构。它们的性能分别通过解析法和有限元法得到。结果的比较表明了该方法的准确性。两个算例表明，该方法可以将大挠曲节点转化为近似直线机构，在5mm位移范围内线性度高于5000。这可以为设计、分析或优化直线柔性机构提供一种新的方法。
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 5 000 within 5 mm displacement. This can lead to a new way to design, analyze or optimize straight-line flexure mechanisms.