Stiffness and stress characteristics of the generalized cross-spring pivot
Stiffness and stress characteristics of the generalized cross-spring pivot
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DOI：
10.1016/j.mechmachtheory.2009.10.001
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发表时间：
2010-03
影响因子：
5.2
通讯作者：
Hongzhe Zhao;S. Bi
中科院分区：
文献类型：
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作者：
Hongzhe Zhao;S. Bi
广义的十字弹簧枢轴由两片叶片在长度方向任意位置对称交叉而成，具有良好的性能，可广泛应用于精密机械中。刚度和应力特性是该枢轴的重要考虑因素，但其中一些属性尚未揭示。在本文中，首先基于一些精确的近似建立了一个简单的刚度预测模型。然后分析力矩刚度和力刚度，以便更好地表征几何参数的影响。在研究了垂直力的影响后，捕获了恒定刚度特性，并根据屈曲载荷提出了一种低旋转刚度的方法。此外，还进行了应力分析，以便能够表征影响因素（如几何参数和载荷）的性质，并通过应力检查来满足大运动范围的枢轴。最后，分析模型揭示的特性通过有限元分析 (FEA) 进行验证。
The generalized cross-spring pivot, formed by crossing two leaves symmetrically at an arbitrary position along the length, can be employed widely in precision machine due to plenty of good performances. The stiffness and stress characteristics are important consideration for this pivot, but some of these attributes have not been revealed. In this paper, a simple model for stiffness prediction is first established based on some accurate approximations. Then moment stiffness and force stiffness are analyzed in order to better characterize the influences of the geometric parameters. After investigating the effect of the vertical force, the constant stiffness property is captured, and an approach to the low rotational stiffness is presented according to the buckling load. Moreover, the stress analysis is also implemented on purpose that the properties of the influencing factors (such as geometric parameters and loads) can be characterized and the pivot with large motion range can be fulfilled by stress checking. Finally, the characteristics, revealed by the analysis model, are validated by finite element analysis (FEA).