Flutter Margin Research Based on System Stability Analysis Methods

The study investigates flutter boundaries and auto-regressive moving average model (ARMA) stability analysis through numerical simulation cases. Two wind tunnel flutter tests were conducted to analyze the influence of parameter identification errors on boundary prediction accuracy. The research findings indicate: (a) Damping errors have smaller impact than frequency errors on the criterion of flutter boundaries. The criterion in the flutter boundary method is more insensitive to damping errors than the criterion in the ARMA stability analysis method. (b) For wing bending-torsion coupled mode flutter, the criteria of these two methods exhibit similar decreasing trend, which helps to predict flutter boundaries in advance. (c) For planar bending flutter, the ARMA stability analysis method may be more suitable than the flutter boundary method.