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The catastrophic/benign flutter boundary character evaluation and its control are carried out for 2-DOF lifting surfaces. Catastrophic/benign implies that the Limit Cycle Oscillation (LCO) is either unstable or stable. Within this work: (1) Quasi-Steady (QS) theory and Computational Fluid Dynamics (CFD) for subsonic flow calculations are implemented, (2) Flutter motion equations of a two-dimensional airfoil section with cubic nonlinear stiffness in the pitching direction are established, (3) Uncoupled bending and torsion frequencies of the selected aerodynamic surface are computed using recently developed Transfer Matrix Method of Multibody Systems (MSTMM), and (4) Lyapunov’s First Quantity (LFQ) is computed to study the bifurcation behavior of the aeroelastic system in the vicinity of the flutter boundary. The main objective of this study is to implement a control capability enabling one to control both the flutter boundary and its character as to safely expand the operational envelop of the aerospace vehicle without failure.

Catastrophic/benign flutter boundary evaluation carried for two-dimensional aerodynamic surface in subsonic flow