Adaptive identification and model tracking by a flexible spacecraft

  • J. M. Skowronski
Conference paper
Part of the Lecture Notes in Control and Information Sciences book series (LNCIS, volume 170)


A rigid-flexible spacecraft structure subject to bounded uncertainty in structural parameters and payload, with large articulation angles, is modelled by a hybrid multidimensional system with high (untruncated) geometric nonlinearity and Coriolis forces. It is to be controlled adaptively to track a rigid body reference model with desired dynamics. To this aim the system is replaced by a nonlinear adaptive, state and parameter identifier with considerably reduced number of DOF and made exactly integrable, i.e. with solutions in closed form. The technique used is that of nonlinear extension to MRAC introduced by the author a few years ago. The results lie in obtaining feedback signal adaptive controller in analytic form and exactly integrable adaptive laws, both the controller and the laws based on the state information supplied by the identifier, thus robust to uncertainty.

The technique allows for the tracking to occur with stipulated precision obtained in stipulated real time. The reduced dynamics and the exact integrability of the identifier and the adaptive laws make on-line computation of the algorithms simple enough to be made sufficiently fast on a small on-board computer.


Geometric Nonlinearity Flight Control Model Reference Adaptive Control Multibodies Flexible System Partial Differential Equation Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • J. M. Skowronski
    • 1
  1. 1.University of Southern CaliforniaLos Angeles

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