Novel Annulus-shaped Flexure Pivot in Rotation Application and Dimensionless Design
Novel Annulus-shaped Flexure Pivot in Rotation Application and Dimensionless Design
复制标题
新型环形柔性枢轴在旋转应用和无量纲设计中的应用
DOI：
10.3901/cjme.2009.06.800
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发表时间：
2009-12-01
影响因子：
4.2
通讯作者：
Zong Guanghua
中科院分区：
文献类型：
--
作者：
Bi Shusheng;Zhao Shanshan;Zong Guanghua
大挠度柔性枢轴广泛应用于高精度旋转场合，但其柔性结构形式较少，设计方法也较为简便。提出了一种由六个弯曲梁柔性元件组成的新型大挠度弯曲柔性环形柔性枢轴。理论上可以提供10度以上的角行程。首先，采用主运动伪刚体法建立柔性枢轴模型。虽然伪刚体法可以用来分析大变形柔性枢轴的性能，但对于这种新型柔性枢轴的设计来说，该方法无疑是一项繁重而困难的工作。为了简化设计过程，提出了基于参数化模型和有限元分析的尺寸设计图。使用尺寸设计方法作为工具，设计人员可以根据环形柔性枢轴的刚度和旋转要求快速确定最佳几何形状。最后给出了以实现环形柔性枢轴回转行程为目标的初步设计尺寸设计图例。有限元分析结果表明，预期回转行程与图形设计结果的相对误差小于4%。采用无量纲化方法设计圆环形柔性枢轴，可以减少设计时间和复杂度。该新型环形柔性枢轴及其尺寸设计方法是对大挠度柔性枢轴结构和设计方法的有益补充。
Large-deflection flexure pivot is widely used in high precision rotation application, but there are less flexure configurations and simple and convenient design methods. This paper presents a novel large-deflection curved-compliant annulus-shaped flexure pivot composed of six curved beam flexure elements. It can offer more than 10 degrees angular stroke theoretically. Firstly, main-motion pseudo-rigid-body method is introduced to establish the flexure pivot model. Although pseudo-rigid-body method can be used to analyze the large-deformation flexure pivot performance, the method is definitely a laborious and difficult task for designing this novel flexure pivot. In order to simply the designing process, dimension-design graphs based on the parametric models and finite element analysis is presented. Using the dimension-design method as a tool, the designers can determine the optimal geometry rapidly, based on the stiffness and rotation demands of an annulus-shaped flexure pivot. Finally, dimension-design graph examples are given whose primary design aims to achieve a rotation stroke of annulus-shaped flexure pivot. The finite element analysis results show that the relative designing error between anticipative rotation stroke and graph design result is less than 4%. The dimensionless method used in designing annulus-shaped flexure pivot can reduce design process in both time and complexity. The novel annulus-shaped flexure pivot and dimension-design method are helpful supplement to configuration and design method of large-deflection flexure pivot.