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Path following by the end-effector of a redundant manipulator operating in a dynamic environment

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1 Author(s)
M. Galicki ; Inst. of Med. Stat., Friedrich Schiller Univ., Jena, Germany

This paper addresses the problem of generating at the control-loop level a collision-free trajectory for a redundant manipulator operating in dynamic environments which include moving obstacles. The task of the robot is to follow, by the end-effector, a prescribed geometric path given in the work space. The control constraints resulting from the physical abilities of robot actuators are also taken into account during the robot movement. Provided that a solution to the aforementioned robot task exists, the Lyapunov stability theory is used to derive the control scheme. The numerical simulation results for a planar manipulator whose end-effector follows a prescribed geometric path, given in both an obstacle-free work space and a work space including the moving obstacles, illustrate the trajectory performance of the proposed control scheme.

Published in:

IEEE Transactions on Robotics  (Volume:20 ,  Issue: 6 )