Abstract
The characterization of the workspace for general spatial 3R chains with skew joint axes is refined by describing the variety of singular displacements as the union of the singular configuration manifolds of orientation type, position type, and attitude type. The surface of attitude singularities is revealed by transferring the singularity sets of spherical 3R chains with intersecting joint axes to the geometry of spatial kinematic chains with skew, non-intersecting joint axes. For this purpose, the degeneracy of a screw system is analyzed by means of a particular angle concept for a set of three oriented lines in space. The obtained argumentation is expressed in terms of geometric manipulator Jacobians completing previous results.
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Notes
- 1.
A sorted pair of two spears and defines a ‘motor’. The special case of intersecting spears with defines a ‘rotor’ and the special case of parallel spears with defines a ‘translator’ [25].
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- 3.
- 4.
“Singularities and mobility are characterized by the determinant of the Jacobian matrix for non-redundant manipulators; or by the determinant of the matrix product of the Jacobian and its transpose for redundant mechanisms.” [16].
- 5.
- 6.
Generally it is assumed that only the pair of first axis and last axis may become coplanar.
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Bongardt, B., Müller, A. (2022). On Orientation, Position, and Attitude Singularities of General 3R Chains. In: Holderbaum, W., Selig, J.M. (eds) 2nd IMA Conference on Mathematics of Robotics. IMA 2020. Springer Proceedings in Advanced Robotics, vol 21. Springer, Cham. https://doi.org/10.1007/978-3-030-91352-6_5
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