Worst case analysis of the X-38 crew return vehicle flight control system
by
J. Shin, G.J. Balas and A.K. Packard
in
AIAA Journal of Guidance, Dynamics and Control, vol. 24, no. 2, March-April, pp. 261-269, 2001.
Category: Journal Article
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Abstract:
A linear fractional transformation (LFT) model of the linearized equation of the lateral-directional axes of the X-38 crew return vehicle is developed to facilitate the analysis of ight control systems. The LFT model represents uncertainty in nine aerodynamic stability derivatives at a given ight condition with frequency-domain performance speciŽ cations. The X-38 LFT model combined with a controller at speciŽ c ight conditions is used to determine the aerodynamic coefŽ cients that result in the worst-case performance and gain/phase margin of the closed-loop system. The objective is to verify that a given controller remains stable and achieves desired performance objectives for all predeŽ ned aerodynamic variations at select operating conditions along its ight trajectory.
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