21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-1.10.2

CLOSED-LOOP CONSTRAINED CONTROL ALLOCATION FOR A SUPERMANOEUVERABLE AIRCRAFT

Dang-Vu B., Brocas D.
ONERA, France

Keywords: closed-loop, constrained control, supermanoeuverable aircraft

Recent research into the problem of allocating flight control effectors to generate specified moments has explored techniques that achieve the maximum attainable aircraft moment. The contribution of this paper is to incorporate open-loop control allocators obtained from such techniques inside a closed-loop dynamic inversion control law. The combined approach is used to design the flight control law of a supermanoeuvrable aircraft. The simulation results of a velocity roll manoeuvre are compared with two other most commonly used control allocation techniques : pseudo-inverse and daisy chaining. When the controls reach saturation, it is shown that the use of moderate sideslip can significantly increase the attainable moment subset at high angle of attack flight regime. A µ-analysis is conducted to assess the stability robustness of the control law to modelling uncertainties.

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