Fast adaptation is commonly required in model reference adaptive control (MRAC) to handle uncertainties and achieve precise command tracking. High adaptive gain achieves fast adaption, and introduces high-frequency oscillation into the control signal. In this paper, we propose a robust compensator–based MRAC (R-MRAC) for an aircraft to tackle the problem of control signal high-frequency oscillation. First, the architecture of a standard MRAC with state augmentation is presented. Second, the control architecture is modified by introducing a robust compensator to guarantee transient performance of the closed-loop system. Finally, the proposed R-MRAC is applied to control the altitude of the aircraft with significant uncertainty in control effectiveness and aerodynamic coefficients. Numerical simulations results show that the proposed R-MRAC can effectively eliminate high-frequency oscillation.
Robust Adaptive Control with Control Structure Modification for Aircraft
Journal of Aerospace Engineering ; 32 , 3
2019-02-27
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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