Aeroelastic stability analysis of an airfoil with structural nonlinearities using a state space unsteady aerodynamics model

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Aeroelastic stability analysis of an airfoil with structural nonlinearities using a state space unsteady aerodynamics model

Murty, H.S.

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 piror to the flutter point for nonlinear spring stiffness, a time response analysis is carried out in order to determine system behaviour. The set of conditions considered in this study produced lower flutter speeds with a nonlinearity than the linear flutter speed.

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Document information

Title :

Aeroelastic stability analysis of an airfoil with structural nonlinearities using a state space unsteady aerodynamics model

Additional title:

Aeroelastische Stabilitätsanalyse eines Tragflügelprofils mit konstruktiven Nichtlinearitäten unter Verwendung der Zustandsraumformulierung für ein instationäres aerodynamisches Modell

Contributors:

Murty, H.S. (author)

Published in:

and AIAA/ASME Adaptive Structures Forum, AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 36 ; 2 ; 1172-1182

Publication date :

1995

Size :

11 Seiten, 7 Bilder, 25 Quellen

ISBN :

1-56347-120-5

Type of media :

Conference paper