Singularity Characteristics of a Class of Spatial Redundantly actuated Cable-suspended Parallel Robots and Completely actuated ones
This paper aims to study singularity characteristics of a class of spatial redundantly actuated Cable-Suspended Parallel Robots (CSPRs) and completely actuated ones with pairwise cables. This study focuses on the CSPRs with purely three translational degrees of freedom using redundant actuators or complete actuators. One class of CSPRs is able to perform the translational movement with pairwise cables as parallelograms. There are two types of singularity to be discussed, which result from dynamic equations of CSPRs and parallelogram pairwise cables configurations. To assure three-translational dofs without the rotation of the end-effector, the matrix formed by normals of pair-wise cables should maintain in full rank. In the case study, one type of CSPRs with a planar end-effector is discussed to clarify and conclude the singularity features. The results show that in some configurations of CSPR there exists singularity of completely actuated CSPR but redundantly actuated ones are able to fulfill the three-translational-dof movement.
KeywordsCable-suspended Parallel Manipulator Singularity analysis Redundant actuator
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- 1.P. Bosscher, R. L. Williams, L. S. Bryson and D. C. Lacouture: Cable-suspended robotic contour crafting system, Automation in Construction, 17 (1), 45-55 (2007).Google Scholar
- 7.C. Gosselin, P. Ren, S. Foucault: Dynamic trajectory planning of a two-dof cable-suspended parallel robot. 2012 IEEE International conference on Robotics and Automation, 1476-1481 (2012).Google Scholar
- 10.S. Behzadipour, A. Khajepour: Cable-based robot manipulators with translational degrees of freedom. Industrial robotics: theory modelling control, 211-236 (2006).Google Scholar
- 11.D. Vu, E. Barnett, A. Zaccarin, C. Gosselin, On the design of a three-DOF cable-suspended parallel robot based on a parallelogram arrangement of the cables. Cable-driven parallel robots, Springer, 319-330 (2018).Google Scholar
- 14.D. Zlatanov, I.A. Bonev, C. Gosselin: Constraint singularities of Parallel Mechanisms. 2002 IEEE International Conference on Robotics and Automation, 496-502 (2002).Google Scholar
- 16.G. Liu, Y. Lou and Z. Li, Singularities of parallel manipulators: a geometric treatment. IEEE transactions on robotics and automations, 19(4), 579-594 (2013).Google Scholar