Robust Stability of Aeroelastic Systems Using [Micron]-Method and Nyquist Criterion

This work presents the robust stability evaluation of aeroelastic systems under the presence of uncertainty in parameters. In order to estimate the stability margins within the expected limits of an uncertain parameter, the total system is defined as a sum of a deterministic nominal model that represents the average system and a feedback signal which introduces the effect of the uncertainty on the system dynamics. If nominal model and the feedback forms a closed loop system, Nyquist Criterion and mu-method can be implemented to analyze the robust stability. In order to present the practical application on a flutter problem and compare the numerical results obtained by Nyquist Criterion and mu-method, a fixed wing example is considered.