Visual Servoing of a Redundant Manipulator with Jacobian Matrix Estimation using Self-organizing Map

Prem Kumar Patchaikani, Laxmidhar Behera

    Research output: Contribution to journalArticlepeer-review

    36 Citations (Scopus)

    Abstract

    Vision based redundant manipulator control with a neural network based learning strategy is discussed in this paper. The manipulator is visually controlled with stereo vision in an eye-to-hand configuration. A novel Kohonen's self-organizing map (KSOM) based visual servoing scheme has been proposed for a redundant manipulator with 7 degrees of freedom (DOF). The inverse kinematic relationship of the manipulator is learned using a Kohonen's self-organizing map. This learned map is shown to be an approximate estimate of the inverse Jacobian, which can then be used in conjunction with the proportional controller to achieve closed loop servoing in real-time. It is shown through Lyapunov stability analysis that the proposed learning based servoing scheme ensures global stability. A generalized weightupdate law is proposed for KSOM based inverse kinematic control, to resolve the redundancy during the learning phase. Unlike the existing visual servoing schemes, the proposed KSOM based scheme eliminates the computation of the pseudo-inverse of the Jacobian matrix in real-time. This makes the proposed algorithm computationally more efficient. The proposed scheme has been implemented on a 7 DOF PowerCubeTM robot manipulator with visual feedback from two cameras.
    Original languageEnglish
    Pages (from-to)978-990
    JournalRobotics and Autonomous Systems
    Volume58
    Issue number8
    DOIs
    Publication statusPublished - Aug 2010

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    Keywords

    • Redundant manipulator
    • Visual servoing
    • Inverse Jacobian
    • Self-organizing map
    • Kinematic control
    • Redundancy resolution

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