  The dynamical response of an aircraft subject to gust perturbations is a key
element in a preliminary design phase. In particular, the loads induced by
gusts along the wing should not exceed some limit values and should even
ideally be decreased. Active control is one lever to address this problem.
However, evaluating the benefit that active control may bring considering some
actuators characteristics or some delay in the loop is a difficult task,
especially in the early design phase. This problem is addressed in this paper
with an open-loop optimal control framework and more specifically with a direct
transcription method resulting in a linear optimisation problem. The approach
is illustrated on a realistic aeroelastic aircraft model built with a coupled
fluid-structure solver which order is reduced to decrease the number of
optimisation variables.
