Abstract
This paper investigated the motion/force transmission quality for a class of parallel Schönflies-motion generators built with four identical RR\(\varPi \)RR-type limbs. It turns out that the determinant of the forward Jacobian matrices for this class of parallel robots can be expressed as the scalar product of two vectors, the first vector being the cross product of the four unit vectors along the parallelograms, the second one being related to the rotation of the mobile platform. The pressure angles, derived from the determinants of forward and inverse Jacobians, respectively, are used for the evaluation of the transmission quality of the robots. Four robots are compared based on the proposed method as illustrative examples.
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Notes
- 1.
R and \({\Pi }\) stand for revolute joint and parallelogram (\(\varPi \) joint), respectively, and the underlined letter indicates the actuated joint.
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Acknowledgements
The reported work is partly supported by the Fundamental Research Funds for the Central Universities (DUT16RC(3)068) and by Innovation Fund Denmark (137-2014-5).
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Wu, G., Bai, S., Caro, S. (2018). Transmission Quality Evaluation for a Class of Four-limb Parallel Schönflies-motion Generators with Articulated Platforms. In: Zeghloul, S., Romdhane, L., Laribi, M. (eds) Computational Kinematics. Mechanisms and Machine Science, vol 50. Springer, Cham. https://doi.org/10.1007/978-3-319-60867-9_32
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DOI: https://doi.org/10.1007/978-3-319-60867-9_32
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