An Algorithm for Computing Cusp Points in the Joint Space of 3-RPR Parallel Manipulators

Details An Algorithm for Computing Cusp Points in the Joint Space of 3-RPR Parallel Manipulators An Algorithm for Computing Cusp Points in the Joint Space of 3-RPR Parallel Manipulators

2007-05-10

arxiv.org/abs/0705.1450v1

European Conference on Mechanism Sciences (21/02/2006) 1-12

Computer Science

Robotics

Scientific paper

This paper presents an algorithm for detecting and computing the cusp points in the joint space of 3-RPR planar parallel manipulators. In manipulator kinematics, cusp points are special points, which appear on the singular curves of the manipulators. The nonsingular change of assembly mode of 3-RPR parallel manipulators was shown to be associated with the existence of cusp points. At each of these points, three direct kinematic solutions coincide. In the literature, a condition for the existence of three coincident direct kinematic solutions was established, but has never been exploited, because the algebra involved was too complicated to be solved. The algorithm presented in this paper solves this equation and detects all the cusp points in the joint space of these manipulators.

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