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Internet-Based Bilateral Teleoperation Based on Wave Variable With Semi-Adaptive Predictor and Direct Drift Control

[+] Author Affiliations
Ho Ching, Wayne J. Book

Georgia Institute of Technology

Paper No. IMECE2005-81112, pp. 1523-1532; 10 pages
doi:10.1115/IMECE2005-81112
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

In a conventional bilateral teleoperation, transmission delay over the internet can potentially cause instability. One of the more robust methods of dealing with this problem is the wave variable. Wave variable guarantees teleoperation stability even under varying transmission delay at the cost of poor transient performance. Adding a predictor on the master side can reduce this undesirable side-effect, but that would require a slave model. Inaccurate slave model used in the predictor as well as variations in transmission delay, both of which are likely under realistic situations, can result in steady state errors. A direct drift control algorithm is used to drive this error to zero regardless of the source of error. A semi-adaptive predictor that can distinguish between free space and rigid contact environment is also used to provide a more accurate force feedback on the master side. This research presents the experimental results and evaluations of the previously mentioned wave variable based methods under realistic operation environment using real master and slave.

Copyright © 2005 by ASME
Topics: Waves , Internet

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