A DH-parameter based condition for 3R orthogonal manipulators to have 4 distinct inverse kinematic solutions

Details A DH-parameter based condition for 3R orthogonal manipulators to have 4 distinct inverse kinematic solutions A DH-parameter based condition for 3R orthogonal manipulators to have 4 distinct inverse kinematic solutions

2007-09-04

arxiv.org/abs/0709.0409v1

Journal of Mechanical Design 127 (2005) 150-155

Computer Science

Robotics

Scientific paper

Positioning 3R manipulators may have two or four inverse kinematic solutions (IKS). This paper derives a necessary and sufficient condition for 3R positioning manipulators with orthogonal joint axes to have four distinct IKS. We show that the transition between manipulators with 2 and 4 IKS is defined by the set of manipulators with a quadruple root of their inverse kinematics. The resulting condition is explicit and states that the last link length of the manipulator must be greater than a quantity that depends on three of its remaining DH-parameters. This result is of interest for the design of new manipulators.

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