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Key features of flexure hinges used as rotational joints

机译:用作旋转接头的挠性铰链的关键特征

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This article is supposed to serve as a guide for the design of flexure hinges that act as rotational joints. Firstly, flexure hinges with concentrated and distributed compliance are reviewed. They can be modeled by linear beam theories or by the theory of Elastica, respectively. Secondly, the transition between these limit cases is investigated by finite element methods (FEM). A planar symmetric flexure hinge with a circular notch serves as an exemplary geometry. By extending the notch the compliance is distributed. The deflection curves and the kinetics of desired and parasitic motions are chosen as key features to be studied. The corresponding results are compressed into a pseudo-rigid-body model (PRBM) approximation for a range of geometries. It turned out that the concentrated compliance matches best with an ideal rotational joint, but even for small displacements large stresses occur so that its range of operation is small. Distributing the compliance increases the range of operation, however stiffness within the task space decreases dramatically so that the design of a flexure hinge becomes a tradeoff between the two concurring goals large stiffness and large range of operation.
机译:这篇文章应该作为设计用作旋转接头的挠性铰链的指南。首先,回顾了具有集中和分散柔顺性的挠性铰链。它们可以分别通过线性束理论或通过Elastica理论建模。其次,通过有限元方法(FEM)研究了这些极限情况之间的过渡。具有圆形凹口的平面对称挠性铰链用作示例性几何形状。通过扩展缺口,可以分发法规遵从性。选择挠曲曲线以及所需运动和寄生运动的动力学作为要研究的关键特征。相应的结果被压缩为一系列几何形状的伪刚体模型(PRBM)近似值。事实证明,集中的柔度与理想的旋转接头最匹配,但是即使对于较小的位移,也会出现较大的应力,因此其工作范围很小。分布顺应性增加了操作范围,但是任务空间内的刚度急剧下降,因此挠性铰链的设计成为两个同时达成的目标,即较大的刚度和较大的操作范围之间的权衡。

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