GF集是一种特殊的集合,用于对机构末端的运动特征进行描述。首先介绍GF集的基本概念和基于GF集的并联机构构型方法,而后提出了基于GF集的3T1R并联机构构型方法。根据该构型方法,得到可构成3T1R类并联机构的GF集的各种组成方式,并列举出具有确定运动特征的支链。最后,根据GF集的求交运算法则,构造了3T1R类并联机构。
A GF set is utilized to describe the kinematic characteristics of an end - effector of a parallel mechanism, The basic concept of GF set and the type synthesis principle based on Gr set are first introduced. A new method for the type synthesis of 3T1R parallel mechanisms based on GF set is then presented, According to the approach pro- posed in this paper, composing patterns of the GFset of 3T1R parallel mechanisms are obtained. Kinematic limbs with specific kinematic character/stics that can be applied to construct 3T1R parallel mechanisms are then enumerated. Finally, the type synthesis of 3T1R parallel mechanisms is developed using the feasible kinematic limbs.