Abstract
We consider nonholonomic mobile manipulators built from an n a joint robotic arm and a nonholonomic mobile platform with two independently driven wheels. Actually, there is no efficient kinematic formalism for these systems which are generally characterized by their high number of actuators. So, kinematic modelling is presented with particular emphasis on redundancy. Whereas kinematic redundancy is well known in the holonomic case, it is pointed out that it is necessary to define velocity redundancy in the case of nonholonomic systems. Reduced velocity kinematics based on quasi-velocities are shown to provide an efficient formalism. Two examples of mobile manipulators are presented. Finally, reduced velocity kinematics and velocity redundancy are shown to be adequate tools in order to realize operational task while optimizing criteria such as manipulability.
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Bayle, B., Renaud, M. & Fourquet, JY. Nonholonomic Mobile Manipulators: Kinematics, Velocities and Redundancies. Journal of Intelligent and Robotic Systems 36, 45–63 (2003). https://doi.org/10.1023/A:1022361914123
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DOI: https://doi.org/10.1023/A:1022361914123