A Spatial Eight-Bar Linkage and Its Association With the Deployable Platonic Mechanisms
A Spatial Eight-Bar Linkage and Its Association With the Deployable Platonic Mechanisms
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DOI：
10.1115/1.4025472
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发表时间：
2014-05
期刊：
影响因子：
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通讯作者：
G. Wei;J. Dai
中科院分区：
文献类型：
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作者：
G. Wei;J. Dai
本文首次提出了一种新型的两自由度单环双平面对称空间八杆机构，该机构具有精确直线运动。对八杆机构的几何和运动学进行了研究，给出了在给定两个对称输入条件下，该机构精确直线运动的封闭形式方程。为了确保两个对称的输入，齿轮八杆机构，然后建议转换成一个精确的直线运动的单自由度连杆机构。所提出的八杆机构产生的直线运动的方向是可变的，并且仅取决于该机构的两对V形R-R副的结构参数。最后，将所提出的八杆机构应用于一组具有径向往复运动的可展开柏拉图机构的综合与构造。提出了基于虚拟中心（VCB）的可展开柏拉图机构综合方法，并制作了可展开柏拉图机构的原型，验证了所提出机构的移动性和运动性。
This paper presents for the first time a novel two degrees of freedom (2-DOF) single-looped dual-plane-symmetric spatial eight-bar linkage with exact straight-line motion. Geometry and kinematics of the eight-bar linkage are investigated and closed-form equations are presented revealing the exact straight-line motion feature of the linkage on the condition that two symmetric inputs are given. In order to secure two symmetric inputs, a geared eight-bar linkage is then proposed converting the linkage into a 1-DOF linkage of exact straight-line motion. The direction of the straight-line motion produced by the proposed eight-bar linkage is changeable and is only dependent on the structure parameters of the two pairs of V-shaped R-R dyads of the linkage. Further, the proposed eight-bar linkage is applied to the synthesis and construction of a group of deployable Platonic mechanisms with radially reciprocating motion. The virtual-center-based (VCB) method is presented for the synthesis and prototypes of the deployable Platonic mechanisms are fabricated verifying the mobility and motion of the proposed mechanisms.