中文摘要：

将具有J个环路的平面单输入一双杆组连杆机构看作由具有j-1个环路的子机构与一个双杆组组成，则此机构的回路情况由组成它的子机构的回路情况、双杆组的构形以及双杆组与子机构运动的相互作用决定．基于此思想，在全面分析了所有类型双杆组的构形及装配条件的基础上，与型转化法机构结构分解路线的自动生成相结合，实现了平面SIDM回路识别的系统化与自动化；为计算机辅助机构综合提供了理论基础和技术方法．

英文摘要：

The circuit problem is a fundamental and difficult problem in the process of linkage synthesis. A planar single-input-dyadic linkage with j loops contains a planar single-input-dyadic linkage with j-1 loops and a dyad. Then, the circuit condition of the planar single-input-dyadie linkage with j loops is determined by the circuit condition of the planar single-input-dyadie linkage with j-1 loops and the configuration of the dyad. Based on the above thought and combined with the automatic generation of structural decomposing of planar mechanism according to the type transformation theory and the assembly configurations and conditions of all types of dyads are analysis thoroughly. Circuit automatic identification of the planar single-input-dyadic linkages with P joint is realized. The results provide technical method for computer aided dimensional synthesis.