Disturbance Observers for Rigid Mechanical Systems: Equivalence, Stability and Design

E. Schrijver, Johannes van Dijk

Research output: Contribution to journalArticleAcademicpeer-review

250 Citations (Scopus)
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Abstract

Mechanical (direct-drive) systems designed for high-speed and high-accuracy applications require control systems that eliminate the influence of disturbances like cogging forces and friction. One way to achieve additional disturbance rejection is to extend the usual (P(I)D) controller with a disturbance observer. There are two distinct ways to design, represent, and implement a disturbance observer, but in this paper it is shown that the one is a generalization of the other. A general systematic design procedure for disturbance observers that incorporates stability requirements is given. Furthermore, it is shown that a disturbance observer can be transformed into a classical feedback structure, enabling numerous well-known tools to be used for the design and analysis of disturbance observers. Using this feedback interpretation of disturbance observers, it will be shown that a disturbance observer based robot tracking controller can be constructed that is equivalent to a passivity based controller. By this equivalence not only stability proofs of the disturbance observer based controller are obtained, but it also provides more transparent controller parameter selection rules for the passivity based controller.
Original languageUndefined
Pages (from-to)539-548
Number of pages10
JournalJournal of dynamic systems, measurement and control : transactions of the ASME
Volume124
Issue number4
DOIs
Publication statusPublished - 2002

Keywords

  • Unknown Input Observer
  • Mechanical System
  • Design
  • Manipulators
  • IR-73890
  • METIS-207783
  • Observers
  • PassivityBased
  • Tracking

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