The interest in the class of unmanned vehicle known as High Altitude Long Endurance aircraft has been growing in the latest years. In this paper, stability problems associated with flight control law design for flexible aircraft are evidenced. A fuzzy-based gain-scheduling approach is proposed to adequate closed-loop response. The application of the technique was demonstrated for the flexible X-HALE aircraft and compared to classical interpolation-based gain-scheduling techniques. Nonlinear simulation results revealed that fuzzy-based gain-scheduling is promising for flexible aircraft control.
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