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The free mobility of a parallel manipulator

  • Jing-Shan Zhao (a1) (a2), Zhi-Jing Feng (a1), Li-Ping Wang (a1) and Jing-Xin Dong (a1)

Abstract

Singularities of a manipulator have been addressed repeatedly. However, the singularities and the degree(s) of freedom, as a matter of fact, are two different aspects of the mobility of a manipulator. Consequently, this paper dedicates to discussing the mobility properties through mobility space, which synchronously define the type, number and direction characteristics of the independent motions that the manipulator should execute. The mobility space of a manipulator can be obtained with reciprocal screws of the manipulator via singular value decomposition, which instantaneously depicts the singularity and mobility problems of the manipulators. Application example demonstrates that this methodology can investigate the all-sided mobility properties of parallel manipulators.

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Corresponding author. Fax: (86) 01062782351. E-mail address: zjs01@mails.tsinghua.edu.cn.

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