Abstract
This paper addresses the design of a robust back-up control law for the future aircraft concept VELA (Very Efficient Large Aircraft) which is naturally unstable in its low-speed flight domain. The design is based on a polytopic technique and assures minimum handling qualities over a wide range of center of gravity (c.o.g.) positions for both longitudinal and lateral aircraft motions. The stability domain in the presence of saturations on the actuator rate outputs is computed and the final control law is validated with a three-axis nonlinear simulator.
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