Abstract
Aeroelastic interactions have been noted to have a strong effect on the flight dynamics of a fixed-wing micro air vehicle. These effects include changes to the frequency and damping of the flight modes and to the shape of the flight modes. However, how these open-loop aeroelastic effects influence the closed-loop aeroservoelastic performance of a micro air vehicle is unclear. The current research investigates the longitudinal, closed-loop tracking performance of a fixed-wing micro air vehicle with varying levels of wing stiffness using a LQR tracking controller. It is found that the tracking performance decreases as wing bending stiffness decreases, for a fixed set of LQR weighting matrices. Additionally, the possibility of virtually changing the stiffness of the wing by using a model-following control scheme is investigated. In this manner, one configuration is made to respond as if it had the closed-loop tracking performance associated with a different level of stiffness. It is observed that the stiff aircraft can approximate the response of the flexible but the flexible aircraft is unable to adequately approximate the performance of the stiff aircraft.
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