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A NON-PARAMETRIC TECHNIQUE FOR AERODYNAMIC STATE IDENTIFICATION FOR FLUTTER PREDICTION

Azevedo, J. H. A.; Azevedo, J. L. F.; Silva, R. G. A.;

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The objective of the present work is to study forms of identifying the aerodynamic states, for state space aeroelastic stability analyses in the frequency domain, using high- fidelity CFD codes in an efficient fashion. In particular, there is interest in the use of non- parametric identification techniques in order to obtain the necessary aerodynamic transfer functions from a single unsteady CFD computation. The CFD tool used is based on the 2-D Euler equations, which are discretized using a finite volume approach for unstructured grids. A centered scheme, with added artificial dissipation, is used for spatial discretization and explicit Runge-Kutta methods are employed for time marching. The work implements a single combined input method in order to simultaneously excite the aerodynamic responses in all the system natural modes and, at the same time, allow the output to be split into the contribution of each individual mode to the aerodynamic transfer function. The proposed approach is applied to a NACA 0012 airfoil-based typical section model in transonic flight. Results are compared to a previously implemented identification capability in which the aerodynamic transfer functions are computed with an unsteady simulation for each modal movement.

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Palavras-chave: System identification, Aerodynamic states, Flutter prediction.,

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DOI: 10.5151/meceng-wccm2012-18743

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Como citar:

Azevedo, J. H. A.; Azevedo, J. L. F.; Silva, R. G. A.; "A NON-PARAMETRIC TECHNIQUE FOR AERODYNAMIC STATE IDENTIFICATION FOR FLUTTER PREDICTION", p. 2175-2194 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-18743

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