Kinematic of symmetric deployable scissor-hinge structures with integral mechanism mode
Kinematic of symmetric deployable scissor-hinge structures with integral mechanism mode
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DOI：
10.1016/j.compstruc.2017.06.006
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发表时间：
2017-10
影响因子：
4.7
通讯作者：
Yao Chen;Linzi Fan;Jian Feng
中科院分区：
文献类型：
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作者：
Yao Chen;Linzi Fan;Jian Feng
本文研究了由连杆、铰和铰组成的剪铰可展结构的运动特性。然而，很少有人关注这些结构的固有对称性和潜在的干扰。本文提出了一种新的对称结构整体机构模型。采用这种机构整体模型，改进了运动分析算法，能够有效地跟踪剪铰结构的运动轨迹。在展开过程中，结构的几何构型和运动不确定性进行了研究。此外，我们关注的非相邻成员之间的干扰和潜在的运动奇异性，这些展开结构。数值分析表明，剪铰结构在完全展开或折叠状态下会产生运动学奇异。这些可展结构在沿着运动路径上的几何变换是连续的、显著的，但其固有对称性保持不变，整体机构模态保持完全对称性。所提出的整体机构模型是针对具体可展结构所特有的，有助于可展结构的进一步研究。
Some cases of kinematic behavior of deployable scissor-hinge structures, which consist of link members and pivot and hinge joints, have been investigated. However, few have concerned the inherent symmetry and potential interference of these structures. Here we present a new mode of integral mechanism for symmetric structures. Adopting this integral mechanism mode, the algorithm of kinematic analysis is improved, and is capable of following the motion path of a scissor-hinge structure efficiently. During deployment, the geometric configurations and kinematic indeterminacy of the structure are studied. Further, we concern the interferences among nonadjacent members and potential kinematic singularity for these deployable structures. Numerical analysis points out that kinematic singularity could be induced when a scissor-hinge structure is fully deployed or folded. Geometric transformations of these deployable structures are continuous and significant when moving along the motion path. Nevertheless, the inherent symmetry keeps unchanged, and the integral mechanism mode preserves full symmetry. The proposed integral mechanism mode is unique to a specific deployable structure, and it is therefore helpful for further studies on deployable structures.