期刊名称：Constantin Brancusi University's Annals, Letters and Social Sciences Serie
印刷版ISSN：1844-6051
出版年度：2009
期号：2
出版社：Academica Brancusi Publisher
摘要：In the present paper the structural analysis of the Assur group of class 4 and order 2 (tetrad) is investigated. Beginning from the tetrad with revolute joints and replacing successively the revolute joint by prismatic joint, 64 kinds of tetrad are generated. The structural analysis of these kinds leads to 24 kinematic models. From these are removed the models that degenerate in four family mechanisms or mechanism with apparent family.
