Theoretical and experimental investigation of performance characteristics and design aspects of cross-spring pivots
Theoretical and experimental investigation of performance characteristics and design aspects of cross-spring pivots
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DOI：
10.1016/j.ijsolstr.2019.08.023
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发表时间：
2020-03
影响因子：
3.6
通讯作者：
L. Goncalves Junior;R. Theska;H. Lepikson;A.S. Ribeiro Junior;S. Linß;P. Gräser
中科院分区：
文献类型：
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作者：
L. Goncalves Junior;R. Theska;H. Lepikson;A.S. Ribeiro Junior;S. Linß;P. Gräser
十字弹簧枢轴在过去的几十年中被广泛应用于各种精密工程应用中，因为它没有粘滑和间隙，可以实现高运动重复性。本文考虑了板簧反曲率的非线性效应，建立了交叉弹簧枢轴弹性运动学行为的精确解析模型。有限元分析（FEA），基于非线性薄壳模型，进行了比较，以便与这种类型的设备的主要性能参数的分析结果，即中心偏移，旋转刚度和应力的片簧。此外，建立了一个实验装置，以评估这两种模型的适用性限制。最后，针对十字弹簧枢轴的设计改进进行了讨论。
Cross-spring pivots have been widely employed over the last decades in a broad variety of precision engineering applications due to the high motion repeatability achieved thanks to the absence of stick slip and clearance. In this paper, the non-linear effect of the anticlastic curvature of the leaf-springs is considered for the accurate analytical modeling of the elasto-kinematic behavior of cross-spring pivots. Finite element analyses (FEA), based on a non-linear thin-shell model, are carried out in order to compare them with the analytical results for the main performance parameters of this type of device, i.e. center-shift, rotational stiffness and stress in the leaf-springs. Furthermore, an experimental setup is built to assess the applicability limits of both models. Finally, remarkable performance aspects of cross-spring pivots are discussed aiming for design improvements.