Conclusion

Abstract

Robust aeroservoelastic stability margins are analyzed by applying the µ method to an aircraft model with associated uncertainties. These margins indicate the smallest perturbation in dynamic pressure for which the model is not robustly stable to those uncertainties. Correspondingly, nominal stability margins consider only a theoretical plant and may be highly suspect because of errors and unmodeled dynamics. Thus, robust margins provide a higher level of safety and are confidence for determining a flight envelope within which an aircraft can operate.