• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2015, Vol. 51 ›› Issue (13): 144-151.doi: 10.3901/JME.2015.13.144

• 机构学及机器人学研究进展——纪念张启先院士诞辰九十周年专辑 • 上一篇    下一篇

2-UPR-RPU并联机构奇异分析

柴馨雪, 项济南, 李秦川   

  1. 浙江理工大学机械与自动控制学院
  • 出版日期:2015-07-05 发布日期:2015-07-05
  • 基金资助:
    国家自然科学基金(51475431)和浙江省自然科学基金(LZ14E050005)资助项目

Singularity Analysis of a 2-UPR-RPU Parallel Mechanism

CHAI Xinxue, XIANG Jinan, LI Qinchuan   

  1. Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University
  • Online:2015-07-05 Published:2015-07-05

摘要: 具有两个转动一个移动(1T2R)的三自由度并联机构是少自由度并联机构中的一个重要分支。1T2R三自由度并联机构根据两条转轴的几何关系和性质可以分为P*U*、UP,PU和RPR等四类:目前对1T2R并联机构的奇异研究主要集中于P*U*类、UP类,而对PU类和RPR类并联机构的奇异研究极少。对一种RPR类的 2-UPR-RPU并联机构进行奇异性分析。运用螺旋理论对2-UPR-RPU并联机构进行自由度分析,推导该机构的运动学反解方程,进而求出机构的雅可比矩阵。根据雅可比矩阵求出2-UPR-RPU机构的三类运动学奇异位形,分析该机构约束奇异。研究表明,2-UPR-RPU并联机构没有运动学反解奇异、运动学正解奇异和约束奇异,但是有两种混合奇异。

关键词: 并联机构, 奇异性, 运动学

Abstract: The 3-DOF parallel mechanism (PM) with one translational and two rotational (1T2R) DOFs is an important category of the lower-mobility PM. The 1T2R 3-DOF PM can be classified into four categories based on the geometry between the two axes of rotations, P*U*-equivalent, UP-equivalent, PU-equivalent, RPR-equivalent PM. The singularity analysis mainly focuses on P*U*-equivalent and UP-equivalent PM, while there is few research on the PU-equivalent and PRP-equivalent PM. A singularity investigation of a 2-UPR-RPU PM belonging to the PRP-equivalent PM of 1T2R is presented. The mobility of a 2-UPR-RPU PM is analyzed by using screw theory. Forward and inverse position relations are established. The Jacobian of the 2-UPR-RPU PM is obtained. Based on the analysis of the Jacobian matrix, three kinds of kinematic singularities of the 2-UPR-RPU PM are identified. The constraint singularity of this PM is analyzed. The 2-UPR-RPU PM has no inverse, forward and constraint singularity and has two kind of combined singularities.

Key words: kinematics, parallel mechanism, singularity

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