桁架
四面体
扭转(腹足类)
刚度
虚拟工作
控制理论(社会学)
基础(拓扑)
自由度(物理和化学)
折叠(DSP实现)
结构工程
工程类
拓扑(电路)
作者
Yundou Xu,Chen Yang,Wenlan Liu,Ma Xiaofei,Jiantao Yao,Yongsheng Zhao
出处
期刊:Journal of Mechanisms and Robotics
[ASME International]
日期:2020-02-01
卷期号:12 (1)
被引量:8
摘要
Abstract Recently, the truss antennas with deployable tetrahedron unit mechanisms have been successfully applied in orbit, owing to the advantages of large calibers, high accuracy, and large folding ratios. As multiloop coupled mechanisms, deployable tetrahedral mechanisms have multiple different output links, whose supporting limbs connecting output links and the base are mutually coupled. These mechanisms are also called the passive-input overconstrained mechanisms because their passive torsion springs are used as drivers and because the number of the drivers contained is more than the degrees of freedom (DOFs). In this work, a method based on the equivalent concept of first link-removing and then restoring is proposed for the DOF analysis of the multiloop coupled deployable tetrahedral mechanisms. With one coupled chain removed, the equivalent serial chains between the coupled components and the base are established in the remainder of the mechanisms. Then, the coupled chain removed is restored and the equivalent of the multiloop coupled mechanisms is obtained. The Lagrange method is used to establish the dynamic equation of the passive-input overconstrained mechanisms; the influence of the stiffness and number of torsion springs on the unfolding motion is examined.
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