The Accurate Modeling and Performance Analysis of Cross-Spring Pivot as a Flexure Module
The Accurate Modeling and Performance Analysis of Cross-Spring Pivot as a Flexure Module
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DOI：
10.1115/detc2008-49694
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Hongzhe Zhao;S. Bi;Jingjun Yu;G. Zong
中科院分区：
文献类型：
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作者：
Hongzhe Zhao;S. Bi;Jingjun Yu;G. Zong
交叉弹簧枢轴作为柔性机构中的一种转动元件或组件，其载荷-位移行为一直是众多研究人员关注的课题。追求既能快速设计又能捕捉特性的模型。本文通过近似给出了一些精确的闭合结果。对于设计者来说，这些表达式很简单，无需进行繁琐的迭代过程即可理解参数。在考虑弯矩、水平力和垂直力的通用载荷作用下，对支点的转动位移和中心位移进行了定性和定量的分析。同时，给出了无近似中心移位的简明表达式。通过有限元分析验证了模型的有效性。即使转角达到±20°，转动位移的相对误差也不超过1.8%。在典型但一般的结构和载荷的情况下，中心移动的两个分量的相对误差分别小于6%和4%。版权所有*2008，ASME
The load-displacement behavior of a cross-spring pivot as a kind of rotational element or module in compliant mechanisms is a subject of keen interest for many researchers. The model allowing not only quick design but also characteristics capture is pursued. This paper addresses some accurate closed-form results via approximations. These expressions are simple for a designer to understand the parameters without resorting to a tedious iterative procedure. The rotational displacement and center shift of the pivot are analyzed both qualitatively and quantitatively, with a general-purposed load applied including bending moment, horizontal and vertical forces. Meanwhile, a concise expression for center shift without approximations is proposed. The validity of the model is verified by finite element analysis (FEA). The relative error of the rotational displacement is less than 1.8% even if the rotational angle reaches ±20° the relative errors for the two components of center shift are less than 6% and 4% respectively, in the case of typical but general configurations and loads.Copyright © 2008 by ASME