Stable torque optimization for redundant robots using a short preview

Khaled Al Khudir, Gaute Halvorsen, Leonardo Lanari, Alessandro De Luca

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We consider the known phenomenon of torque oscillations and motion instabilities that occur in redundant robots during the execution of sufficiently long Cartesian trajectories when the joint torque is instantaneously minimized. In the framework of on-line local redundancy resolution methods, we propose basic variations of the minimum torque scheme to address this issue. Either the joint torque norm is minimized over two successive discrete-time samples using a short preview window, or we minimize the norm of the difference with respect to a desired momentum-damping joint torque, or the two schemes are combined together. The resulting local control methods are all formulated as well-posed linear-quadratic problems, and their closed-form solutions generate also low joint velocities while addressing the primary torque optimization objectives. Stable and consistent behaviors are obtained along short or long Cartesian position trajectories, as illustrated with simulations on a 3R planar arm and with experiments on a 7R KUKA LWR robot.
Original languageEnglish
Pages (from-to)2046-2053
Number of pages8
Journal IEEE Robotics and Automation Letters
Volume4
Issue number2
DOIs
Publication statusPublished - 15 Feb 2019
Externally publishedYes

Keywords

  • Robotics
  • motion control
  • Optimisation
  • Dynamic

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  • Activities

    • 1 Oral presentation

    Stable Torque Optimization for Redundant Robots using a Short Preview

    Khaled Al Khudir (Speaker)
    2019

    Activity: Talk or presentationOral presentation

    Research Output

    • 3 Citations
    • 3 Article
    • 1 Chapter

    Human-robot contactless collaboration with mixed reality interface

    Khatib, M., Al Khudir, K. & De Luca, A., 5 Aug 2020, In : Robotics and Computer-Integrated Manufacturing. 67, 12 p., 102030.

    Research output: Contribution to journalArticle

  • Task Priority Matrix at the acceleration level: Collision avoidance under relaxed constraints

    Khatib, M., Al Khudir, K. & De Luca, A., 25 Jun 2020, In : IEEE Robotics and Automation Letters. 5, 3, p. 4970-4977 8 p., 9126194.

    Research output: Contribution to journalArticle

  • 1 Citation (Scopus)

    Faster motion on Cartesian paths exploiting robot redundancy at the acceleration level

    Al Khudir, K. & De Luca, A., 9 Jul 2018, In : IEEE Robotics and Automation Letters. 3, 4, p. 3553-3560 8 p.

    Research output: Contribution to journalArticle

  • 3 Citations (Scopus)

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