Dynamic redundancy resolution in a nonholonomic wheeled mobile manipulator

  • Authors:
  • Glenn d. White;Rajankumar m. Bhatt;Venkat n. Krovi

  • Affiliations:
  • Department of mechanical and aerospace engineering, state university of new york at buffalo, buffalo, ny 14260, usa e-mails: gdwhite@eng.buffalo.edu, rmbhatt@eng.buffalo.edu;Department of mechanical and aerospace engineering, state university of new york at buffalo, buffalo, ny 14260, usa e-mails: gdwhite@eng.buffalo.edu, rmbhatt@eng.buffalo.edu;Department of mechanical and aerospace engineering, state university of new york at buffalo, buffalo, ny 14260, usa e-mails: gdwhite@eng.buffalo.edu, rmbhatt@eng.buffalo.edu

  • Venue:
  • Robotica
  • Year:
  • 2007

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Abstract

Wheeled Mobile Manipulators (WMM) possess many advantages over fixed-base counterparts in terms of improved workspace, mobility and robustness. However, the combination of the nonholonomic constraints with the inherent redundancy limits effective exploitation of end-effector payload manipulation capabilities. The dynamic-level redundancy-resolution scheme presented in this paper decomposes the system dynamics into decoupled task-space (end-effector motions/forces) and a dynamically consistent null-space (internal motions/forces) component. This simplifies the subsequent development of a prioritized task-space control (of end-effector interactions) and a decoupled but secondary null-space control (of internal motions) in a hierarchical WMM controller. Various aspects of the ensuing novel capabilities are illustrated using a series of simulation results.