A variable structure observer for the control of robot manipulators

Abdelkader Abdessameud, Mohamed Fayçal Khelfi

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


This paper deals with the application of a variable structure observer developed for a class of nonlinear systems to solve the trajectory tracking problem for rigid robot manipulators. The analyzed approach to observer design proposes a simple design methodology for systems having completely observable linear parts and bounded nonlinearities and/or uncertainties. This observer is basically the conventional Luenberger observer with an additional switching term that is used to guarantee robustness against modeling errors and system uncertainties. To solve the tracking problem, we use a control law developed for robot manipulators in the full information case. The closed loop system is shown to be globally asymptotically stable based on Lyapunov arguments. Simulation results on a 3-DOF robot manipulator show the asymptotic convergence of the vectors of observation and tracking errors.

Original languageEnglish (US)
Pages (from-to)189-196
Number of pages8
JournalInternational Journal of Applied Mathematics and Computer Science
Issue number2
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)
  • Engineering (miscellaneous)
  • Applied Mathematics


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