Robust control of a nonlinear non-minimum phase supersonic flight vehicle based on stable system center

Authors: Mohsen Bahrami, Behrouz Ebrahimi, Mehdi Asadi

Abstract:
Design and synthesis of a nonlinear time-varying and non-minimum phase supersonic flight vehicle longitudinal dynamics control for g-commands output tracking are presented. Differential geometric approach utilized to outline system relative degree and unstable internal dynamics explored based on the vehicle dynamics transformation into a nonlinear normal form. Unstable internal dynamics are then invoked to identify ideal state reference profiles leading to a desired output-tracking problem. Compensated internal dynamics converged to a solution on the system center manifold for ideal internal dynamics asymptotically. Finally, sliding mode control employed based on an appropriate sliding manifold to track the reference input while being robust against uncertainties. Simulation results are performed and effectiveness of the designed approach demonstrated.

Keywords:
Internal dynamics
Non-minimum phase systems
Stable system center
Nonlinear
Time-varying
Flight vehicle

Published in: Aerospace Science and Technology  (Volumes 25, Issue 1, March, 2013)

Publisher: Elsevier

ISSN Information: 1270-9638

Robust control of a nonlinear non-minimum phase supersonic flight vehicle based on stable system center

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