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Constraint network analysis of 3-dimensional insertion tasks

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Abstract

Flexible assembly machines may be improved and costs reduced by relaxing constraints on part fixturing accuracy and employing compliant devices in assembly effectors. An effector-mounted remote center compliance device that corrects for spatial misalignments of prismatic parts of general cross section has recently been demonstrated. This “spatial RCC” was designed by planning for the possible fine motion assembly contact states given a range of initial position and orientation uncertainty between the mating parts. These fine motion contact states are arranged in a constraint network in the fashion of a Petri net controller, however, the control transitions are mediated by compliances reacting to contact forces rather than from force sensing and discrete event controller schemes. A path through the constraint network of a square peg and hole task is found from initial to final assembly states. This path defines a single compliance relationship that is realized with a practical assembly device. Extensions of this design technique to other assembly tasks are discussed.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Department of Industrial and Systems Engineering, Virginia Tech, Blacksburg, VA

    R. H. Sturges

  2. Center of Operation for FIeld RoBOtics Development (FIBO), King Mongkut's Institute of Technology Thonburi, Bangmod, Bangkok, Thailand

    Schitt Laowattana

Authors
  1. R. H. Sturges
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  2. Schitt Laowattana
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Sturges, R.H., Laowattana, S. Constraint network analysis of 3-dimensional insertion tasks. Journal of Intelligent Manufacturing 13, 19–38 (2002). https://doi.org/10.1023/A:1013624912122

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  • DOI: https://doi.org/10.1023/A:1013624912122

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