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Eight-bar linkage
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Eight-bar linkage : ウィキペディア英語版
Eight-bar linkage

An eight-bar linkage is a one degree-of-freedom mechanism that is constructed from eight links and 10 joints.〔( J. M. McCarthy and G. S. Soh, Geometric Design of Linkages, 2nd Edition, Springer 2010 )〕 These linkages are rare compared to four-bar and six-bar linkages, but two well-known examples are the Peaucellier linkage and the linkage designed by Theo Jansen for his walking machines.
==Classification of eight-bar linkages==
Eight-bar linkages are classified by how many binary, ternary and quaternary links that they have. A binary link connects two joints, a ternary link connects three joints and a quaternary link connects four joints. There are three classes of eight-bar linkage denoted (4, 4, 0, 0), (5, 2, 1, 0) and (6, 0, 2, 0), distinguished by the count of binary, ternary and quaternary links, when read from left to right---the final zero is traditionally added to the class label though no eight-bar linkage has a quintanary link..
There are sixteen different topologies of eight-bar linkages which are distinguished by their non-isomorphic linkage graphs. Of these 16 topologies, nine are in class (4, 4, 0, 0), five are in (5, 2, 1, 0) and two in (6, 0, 2, 0).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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