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Modern manned and unmanned aircraft designs have a lightweight and flexible structure to increase the flight performance. This trend is continuing with more flexible aircraft structures that possess a nonlinear behaviour. Typically those very flexible are equiped with a flight control system. This paper addresses trajectory control in longitudinal and lateral motion of a highly flexible aircraft with nonlinear dynamics. A new flight control design approach is introduced that is based on the classical multi-loop control law structure with specific considerations for the nonlinear structural behaviour. The inner loops of the flight control laws shall ensure stability and an optimal shape of the aircraft. The nonlinearities are summed up as uncertainties. Control design strategies in the frequency domain are used to achieve the design objectives. The outer loops are based on the classical multi-loop concept for autopilots. The design method and results in a linear and nonlinear simulation of the very flexible unmanned aerial vehicle X-HALE are presented.

Development of Robust Flight Control Laws for a Highly Flexible Aircraft in the Frequency Domain