Adaptive neural network based tracking control for electrically driven flexible-joint robots without velocity measurements

  • Authors:
  • Hui-Min Yen;Tzuu-Hseng S. Li;Yeong-Chan Chang

  • Affiliations:
  • Department of Electrical Engineering, National Cheng Kung University, 1, University Road, Tainan 701, Taiwan, ROC;Department of Electrical Engineering, National Cheng Kung University, 1, University Road, Tainan 701, Taiwan, ROC;Department of Electrical Engineering, Kun-Shan University, 949, Da-Wan Road, Yung-Kang District, Tainan 71003, Taiwan, ROC

  • Venue:
  • Computers & Mathematics with Applications
  • Year:
  • 2012

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Abstract

This paper addresses the motion tracking control for a class of flexible-joint robotic manipulators actuated by brushed direct current motors. This class of electrically driven flexible-joint robots is perturbed by plant uncertainties and external disturbances. Adaptive neural network systems are employed to approximate the behaviors of uncertain mechanical and electrical dynamics. A reduced-order observer is constructed to estimate the velocity signals. Only the measurements of link position and armature current are required for feedback. Consequently, an adaptive neural network-based dynamic feedback tracking controller without velocity measurements is developed such that all the states and signals of the closed-loop system are bounded and the trajectory tracking errors can be made as small as possible. Finally, simulation results are presented to demonstrate the effectiveness of the proposed control algorithms.