Robust Aeroservoelastic-Stability Margins

In aeroservoelastic (ASE)-stability analysis, one considers the coupling of the aerodynamic, inertial, structural, actuation, and control-system elements of the dynamics of an aircraft. The closed-loop interactions of these elements can introduce unexpected instabilities in flight if the analytical model used for synthesis and analysis is not accurate. Measures of allowable flight-condition variations, called "stability margins," should be computed to indicate the range of velocities and altitudes within which the aircraft can safely operate.