| Author | H. S. Murty |
|---|---|
| Title | Aeroelastic Stability Analysis of an Airfoil with Structural Nonlinearities Using a State Space Unsteady Aerodynamics Model |
| Year | 1995 |
| Journal | AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference |
| Volume | 2 |
| Pages | 1172-1182 |
| Editor | - - |
| Abstract | Aeroelastic stability analysis is carried out with a structural cubic nonlinearity in torsional stiffness, for a two-degree-of-freedom airfoil. This analysis was carried out using a state space formulation for the aerodynamic model. This formulation enables hard coupling between the aerodynamics and the structural dynamics. The stability of the system is determined by carrying out an eigenvalue analysis. This analysis was applied to the case of a NACA 64A006 airfoil at a freestream Mach number of 0.85. As limit cycle oscillations can occur prior to the flutter point for nonlinear spring stiffnesses, a time response analysis is carried out in order to determine system behavior. The set of conditions considered in this study produced lower flutter speeds with a nonlinearity than the linear flutter speed. |
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