Isomorphism identification is an important and difficult problem in mechanism type synthesis, it is also one of the most difficult problems in graph theory.
同构识别是机构类型综合中一个重要而又困难的问题，同时，也是图论中非常难解决的问题之一。
2
The classification and isomorphism identification of planar mechanism kinematic chains are important problems in the structural analysis and type synthesis of planar mechanism.
平面机构运动链的分类与同构识别是机构结构分析与类型综合中的重要问题。
3
Since the importance of the identifying of the kinematics' isomorphism in mechanism's structural type synthesis, this paper attempted to use a few methods to do it.