Extended state observer based robust control of wing rock motion

Abstract In this paper, a new design based on the Extended State Observer (ESO) technique for the robust control of wing rock motion of slender delta wings is proposed. The wing rock motion dynamics with varying angle of attack is significantly uncertain. The ESO is employed to simultaneously estimate the state and the uncertainty. The estimated uncertainty is used to robustify an Input–Output Linearization based controller designed for the nominal system. Closed loop stability of the overall system is established. The notable feature of the proposed design is that it neither requires accurate plant model nor any information about the uncertainty. The effectiveness of the ESO in estimation of the uncertainties and states and in regulating the rolling motion in the presence of significant uncertainties and un-modeled servo and sideslip dynamics is illustrated by simulation. Lastly, the efficacy of the proposed design is demonstrated by comparing its performance with some well-known existing designs.

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