Numerical model for the simulation of the aeroelastic response of fixed wings. / Modelo numérico para simulação da resposta aeroelástica de asas fixas.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

A numerical model for the simulation of the aeroelastic response of fixed wings is proposed. The methodology used in the work is to treat the aerodynamic and the structural dynamics separately and then couple them in the equation of motion. The dynamic characterization of a prototype wing is done by the finite element method and the equation of motion is written in modal coordinates. The unsteady aerodynamic loads are predicted using the vortex lattice method. The exchange of information between the aerodynamic and structural meshes is done by the surface splines interpolation scheme, and the equation of motion is solved interactively in the time domain, employing a predictor-corrector method. The aerodynamic and structural dynamics theories, and the methodology to couple them, are described separately, together with the corresponding obtained results. The aeroelastic response of the prototype wing is represented by time histories of the modal coordinates for different airspeeds, and the flutter occurrence is verified when the time histories diverge (i.e. the amplitudes keep growing). Fast Fourier Transforms of these time histories show the coupling of frequencies, typical of the flutter phenomenon.

ASSUNTO(S)

flutter aeroelasticity método de malha de vórtices aerodinâmica não-estacionária unsteady aerodynamics aeroelasticidade vortex lattice method

ACESSO AO ARTIGO

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