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The International Journal of Robotics Research
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Solving the Forward Kinematics of a Gough-Type Parallel Manipulator with Interval Analysis

J. -P. Merlet

INRIA Sophia-Antipolis, France

We consider in this paper a Gough-type parallel robot and we present an efficient algorithm based on interval analysis that allows us to solve the forward kinematics, i.e., to determine all the possible poses of the platform for given joint coordinates. This algorithm is numerically robust as numerical round-off errors are taken into account; the provided solutions are either exact in the sense that it will be possible to refine them up to an arbitrary accuracy or they are flagged only as a "possible" solution as either the numerical accuracy of the computation does not allow us to guarantee them or the robot is in a singular configuration. It allows us to take into account physical and technological constraints on the robot (for example, limited motion of the passive joints). Another advantage is that, assuming realistic constraints on the velocity of the robot, it is competitive in term of computation time with a real-time algorithm such as the Newton scheme, while being safer.

Key Words: forward kinematics • parallel robot

The International Journal of Robotics Research, Vol. 23, No. 3, 221-235 (2004)
DOI: 10.1177/0278364904039806
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