Wing rock regulation with a time-varying angle of attack

We consider the problem of aircraft wing rock regulation given that the angle of attack is allowed to change with time. This is an extension beyond the results currently available in the literature on this application, since the complex nonlinear behavior of the wing rock phenomenon, and its qualitative dependence on the angle of attack have generally forced researchers to keep the angle of attack fixed in order to develop regulators. In some cases, those regulators are tested at other angles of attack, and this serves to claim robustness of the designs. Here, we apply newly developed techniques for nonlinear systems with a time-varying structure to this problem, and show that regulation can be achieved even when the angle of attack changes with time over a wide range.