Different-Level Simultaneous Minimization of Joint-Velocity and Joint-Torque for Redundant Robot Manipulators

  • Authors:
  • Yunong Zhang;Dongsheng Guo;Shugen Ma

  • Affiliations:
  • School of Information Science and Technology, Sun Yat-sen University, Guangzhou, China 510006;School of Information Science and Technology, Sun Yat-sen University, Guangzhou, China 510006;Department of Robotics, Ritsumeikan University, Shiga-ken, Japan 525-8577

  • Venue:
  • Journal of Intelligent and Robotic Systems
  • Year:
  • 2013

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Abstract

In J Robot Syst 13(3):177---185 (1996), Ma proposed an efficient technique to stabilize local torque optimization solution of redundant manipulators, which prevents occurrence of high joint-velocity and guarantees the final joint-velocity to be near zero. To prevent the same problems, a different-level simultaneous minimization scheme is proposed in this paper for robotic redundancy resolution, which combines the minimum two-norm joint-velocity and joint-torque solutions via two weighting factors. Physical constraints such as joint-angle limits, joint-velocity limits and joint-acceleration limits are also taken into consideration in such a scheme-formulation. Moreover, the proposed different-level simultaneous minimization scheme is resolved at the joint-acceleration level and reformulated as a general quadratic program (QP). Computer-simulation results based on the PUMA560 robot manipulator performing different types of end-effector path-tracking tasks demonstrate the validity and advantage of the proposed different-level simultaneous minimization scheme. Furthermore, experimental verification conducted on a practical six-link planar robot manipulator substantiates the effectiveness and the physical realizability of the proposed scheme.