Research Papers

Mobility Analysis of Limited-Degrees-of-Freedom Parallel Mechanisms in the Framework of Geometric Algebra

[+] Author and Article Information
Qinchuan Li

Mechatronic Institute,
Zhejiang Sci-Tech University,
Zhejiang Province 310018, China
e-mail: qchuan@zstu.edu.cn

Xinxue Chai

Mechatronic Institute,
Zhejiang Sci-Tech University,
Zhejiang Province 310018, China
e-mail: jxcxx88@163.com

Ji'nan Xiang

Mechatronic Institute,
Zhejiang Sci-Tech University,
Zhejiang Province 310018, China
e-mail: xjinan@163.com

1Corresponding author.

Manuscript received July 28, 2015; final manuscript received November 23, 2015; published online March 7, 2016. Assoc. Editor: Yuefa Fang.

J. Mechanisms Robotics 8(4), 041005 (Mar 07, 2016) (9 pages) Paper No: JMR-15-1210; doi: 10.1115/1.4032210 History: Received July 28, 2015; Revised November 23, 2015

Mobility is a basic property of a mechanism. The aim of mobility analysis is to determine the number of degrees-of-freedom (DOF) and the motion pattern of a mechanism. The existing methods for mobility analysis have some drawbacks when being applied to limited-DOF parallel mechanisms (PMs). Particularly, it is difficult to obtain a symbolic or closed-form expression of mobility and its geometric interpretations are not always straightforward. This paper presents a general method for mobility analysis of limited-DOF PMs in the framework of geometric algebra. The motion space and constraint space of each limb are expressed using geometric algebra. Then the mobility of the PM can be calculated based on the orthogonal complement relationship between the motion space and the constraint space. The detailed mobility analyses of a 3-RPS PM and a 3-RPC PM are presented. It is shown that this method can obtain a symbolic expression of mobility with straightforward geometric interpretations and is applicable to limited-DOF PMs with or without redundant constraints. Without solving complicated symbolic linear equations, this method also has computational advantages.

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Grahic Jump Location
Fig. 1

Geometric interpretation of outer product (a) a∧b and (b) a∧b∧c

Grahic Jump Location
Fig. 2

The flow chart for detecting the redundant constraints

Grahic Jump Location
Fig. 3

The flow chart of mobility analysis using geometry algebra




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