PDF全文下载:20160100067
梁辉1, 李伟2, 赵宇1, 胡同帅1
(1. 青岛科技大学 机电工程学院,山东 青岛 266061; 2. 青岛职业技术学院 海尔学院(机电学院), 山东 青岛 266555)
摘要: 并串联机构相对纯并联机构能够增大工作空间,同时能够增加动平台的灵活性。以2(3RPS)并串运动平台为例,给出了并串运动平台的力雅克比矩阵的推导方法以及发生奇异的条件。首先,基于螺旋理论,分析了上下3RPS并联机构支链的运动螺旋系和约束反螺旋;然后运用互易积理论,得到了2(3RPS)并串运动平台的完整运动雅克比矩阵,在此基础上,建立了该机构的静力平衡方程和力雅克比矩阵,发现该矩阵是由2个3RPS并联机构运动雅克比矩阵的转置而联立组成的6×12矩阵。最后,通过分析力雅克比矩阵是否降秩,具体分析了2(3RPS)并串运动平台的约束奇异、运动奇异以及混合奇异位形。
关键词: 并串联机构; 螺旋理论; 雅克比矩阵; 2(3RPS); 奇异位形
中图分类号: TH 112 文献标志码: A
Singularity Analysis of Parallelserial Motion Platform of 2(3RPS)
LIANG Hui1, LI Wei2, ZHAO Yu1, HU Tongshuai1
(1.College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China;
2.Haier College(College of Electromechanical), Qingdao Technical College, Qingdao 266555, China)
Abstract: Compared to the pure parallel manipulator,the working space of the parallelserial motion platform can be increased and so as the flexibility of the moving platform.Therefor,its application foreground is broad.Taken 2(3RPS) parallelserial motion platform as an example,a method for deducing the static Jacobian matrix and conditions for singularity of parallelserial mechanism are illustrated. Firstly,the moving screw system and the constraint antiscrew of the chains of the the upper and lower 3RPS parallel mechanism are analyzed base on screw theory.and then, their complete Jacobian matrix are obtained by the theory of reciprocal screw.Base on what has been done,the static equilibrium equations and the Jacobian matrix of the manipulator are established,and the static Jacobian matrix is a six by twelve matrix,which consists of the transpose Jacobian matrix of the upper and lower 3RPS parallel mechanism.At last, the constraint,moving and hybrid singular configuration are detailed analyzed by investigating the ranks of the static Jacobian matrix.
Key words: parallelserial manipulator; screw theory; Jacobian matrix; 2(3RPS); singular configuration
收稿日期: 20140929
基金项目: 国家自然科学基金资助项目(51105213).
作者简介: 梁辉(1971—),男,副教授.
文章编号: 16726987(2016)01006706; DOI: 10.16351/j.16726987.2016.01.014