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Stabilized minimum infinity-norm torque solution for redundant manipulators

Published online by Cambridge University Press:  05 April 2001

Ick-Chan Shim
Affiliation:
Department of Mechanical Engineering Korea Advanced Institute of Science and Technology, Yusung-ku, Taejon, 305-701, Korea
Yong-San Yoon
Affiliation:
Department of Mechanical Engineering Korea Advanced Institute of Science and Technology, Yusung-ku, Taejon, 305-701, Korea

Abstract

The minimization of the joint torques based on the ∞-norm is proposed for the dynamic control of a kinematically redundant manipulator. The ∞-norm is preferred to the 2-norm in the minimization of the joint torques since the maximum torques of the actuators are limited. To obtain the minimum ∞-norm torque solution, we devised a new algorithm that uses the acceleration polyhedron representing the end-effector's acceleration capability. Usually the minimization of the joint torques has an instability problem for the long trajectories of the end-effector. To suppress this instability problem, an inequality constraint, named the feasibility constraint, is developed from the geometrical relation between the required end-effector acceleration and the acceleration polyhedron. The minimization of the °-norm of the joint torques subject to the feasibility constraint is shown to improve the performances through the simulations of a 3-link planar redundant manipulator.

Type
Research Article
Copyright
1998 Cambridge University Press

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