Abstract
Sub-6th order screw systems composed of (the sum of) three planar pencils of lines (PPLs)—3-PPL-systems—are closely related to the static singularity (or forward kinematic singularity) analysis of a number of 3-legged parallel manipulators and inverse kinematic singularity analysis of a class of hybrid manipulators. This paper presents an alternative simple approach to the derivation of the conditions for sub-6th order 3-PPL-systems. The characteristics of fourth order 2-PPL-systems are first revealed by using a reciprocal-screw-system based approach. By decomposing a 3-PPL-system as the sum of a 2-PPL-system and a 1-PPL-system, conditions for sub-6th order 3-PPL-systems can then be derived based on the intersection of screw systems. This paper also contributes to the classification of 3-PPL-systems.
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Notes
- 1.
Screws of non-zero pitch within a fourth order 2-PPL-system are omitted since they are irrelevant to the conditions for sub-6th order 3-PPL-systems.
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Acknowledgments
The first author would like to acknowledge the financial support of Engineering and Physical Sciences Research Council of the UK (EPSRC) under grant Nos. EP/I016333/1 and EP/K018345/1. The second author would like to acknowledge the support of National Science Foundation China under Grant No. 51375058. The authors also acknowledge the support from the Overseas Famous Scholar Program Sponsored by Chinese Ministry of Education, China. Thanks to Mr Ruiming Li from Beijing Jiaotong University, China for creating the CAD models in Fig. 1.
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Kong, X., Li, D. (2014). Conditions for Sub-6th Order Screw Systems Composed of Three Planar Pencils of Lines. In: Lenarčič, J., Khatib, O. (eds) Advances in Robot Kinematics. Springer, Cham. https://doi.org/10.1007/978-3-319-06698-1_51
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DOI: https://doi.org/10.1007/978-3-319-06698-1_51
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