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Control of Industrial Robot Joint Flexibility Using Acceleration Feedback

[+] Author Affiliations
Ahmed S. Zaki

KVH Industries, Inc.

Paper No. IMECE2005-80586, pp. 1469-1474; 6 pages
doi:10.1115/IMECE2005-80586
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Dynamic Systems and Control, Parts A and B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 0-7918-4216-9 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

Many industrial robotic arms are used for general pick and place operations. These particular robotic arms are usually driven by timing belts, which limit the speed of the pick and place operation due to undesirable vibration at the end of the motion. This undesirable vibration is attributed to the timing belt’s flexibility, which introduces resonance inside the servo bandwidth. The objective of this paper is to demonstrate a simple and robust approach, which can be easily implemented in real time, to control robot belt flexibility. By using standard industrial accelerometers and a sliding observer, all the information required to implement a control can be estimated. A description of the sliding observer design and the vibration suppression controller are presented in this paper. Simulation results show how this technique can successfully reduce the robot end-point vibration and improve the bandwidth of the servo controller.

Copyright © 2005 by ASME
Topics: Plasticity , Robots , Feedback

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