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International Conference on Cable-Driven Parallel Robots

CableCon 2021: Cable-Driven Parallel Robots pp 348–359Cite as

Accuracy Improvement for CDPRs Based on Direct Cable Length Measurement Sensors

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Part of the Mechanisms and Machine Science book series (Mechan. Machine Science,volume 104)

Abstract

In many applications of cable-driven parallel robots (CDPRs), accuracy is an important requirement. The accuracy of CDPRs with a controller based only on the standard kinematic model is limited because of effects like cable elongation. Carrying payload on the platform, i.e. applying an external wrench, increases the influence of this effect. To address this problem, we present a cable length correction method based on direct cable length measurement sensors (DCLM-Sensors). With this method, effects like cable elongation can be compensated. In experiments, the position accuracy of the cable robot IPAnema 3 could be improved by 61.49% without additional payload, and 86.31% with additional payload. We present the integration of the sensor feedback in the cable robot controller and the results of an experimental evaluation on the cable robot IPAnema 3.

Keywords

  • Cable-driven parallel robot
  • CDPR
  • Direct cable length measurement
  • DCLM-Sensor
  • Laser sensor
  • Accuracy
  • Elongation
  • Creep

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Fig. 1.

(modified from [2])

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(modified from [5])

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Notes

  1. 1.

    https://gitlab.cc-asp.fraunhofer.de/wek/wirex.git.

  2. 2.

    https://www.sick.com/de/en/p/p346664 [Accessed: 04-February-2021].

  3. 3.

    https://www.hexagonmi.com/de-de/products/laser-tracker-systems/leica-absolute-tracker-at960 [Accessed: 04-February-2021].

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Author information

Authors and Affiliations

  1. Robot and Assistive Systems Department, Fraunhofer Institute for Manufacturing Engineering and Automation IPA, 70569, Stuttgart, Germany

    Christoph Martin, Marc Fabritius & Johannes T. Stoll

  2. Institute for Control Engineering of Machine Tools and Manufacturing Units (ISW) University of Stuttgart, 70049, Stuttgart, Germany

    Andreas Pott

Authors
  1. Christoph Martin
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  2. Marc Fabritius
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  3. Johannes T. Stoll
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  4. Andreas Pott
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Corresponding author

Correspondence to Christoph Martin .

Editor information

Editors and Affiliations

  1. LIRMM, Univ Montpellier, CNRS, Montpellier, France

    Prof. Marc Gouttefarde

  2. Chair of Mechatronics, University of Duisburg-Essen, Duisburg, Germany

    Dr. Tobias Bruckmann

  3. University of Stuttgart, Stuttgart, Germany

    Prof. Andreas Pott

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Martin, C., Fabritius, M., Stoll, J.T., Pott, A. (2021). Accuracy Improvement for CDPRs Based on Direct Cable Length Measurement Sensors. In: Gouttefarde, M., Bruckmann, T., Pott, A. (eds) Cable-Driven Parallel Robots. CableCon 2021. Mechanisms and Machine Science, vol 104. Springer, Cham. https://doi.org/10.1007/978-3-030-75789-2_28

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