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(Referência obtida automaticamente do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Design of an experimental flutter mount system

Texto completo
Autor(es):
Carlos De Marqui Junior ; Daniela C. Rebolho [2] ; Eduardo M. Belo [3] ; Flávio D. Marques [4] ; Roberto H. Tsunaki [5]
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: Journal of the Brazilian Society of Mechanical Sciences and Engineering; v. 29, n. 3, p. 246-252, 2007-09-00.
Resumo

Aeroelastic instabilities may occur in aircraft surfaces, leading then to failure. Flutter is an aeroelastic instability that results in a self-sustained oscillatory behaviour of the structure. A two-degree-of-freedom flutter can occur with coupling of bending and torsion modes. A flexible mount system has been developed for flutter tests in wind tunnels. This apparatus must provide a well-defined 2DOF system on which rigid wings encounter flutter. Simulations and Experimental Tests are performed during the design period. The dimensions of the system are determined by Finite Element analysis and verified with an Aeroelastic Model. The system is modified until first bending and torsion modes become the first and second modes and other modes become higher than these. After this, a Modal Analysis is performed. An identification algorithm, ERA, is used to determine modes shape and frequencies from experimental data. Detailed results are presented for first bending and torsion modes, which are involved in flutter. The flutter mechanism is demonstrated by Frequency Response Functions obtained in several wind tunnel velocities until flutter achievement and by a V-g-f plot obtained from an identification process performed with an extended ERA. Mode coupling, damping behaviour and the self-sustained oscillatory behaviour are verified characterising flutter. (AU)

Processo FAPESP: 99/04980-0 - Aplicação de técnicas não convencionais de controle em aeroservoelasticidade
Beneficiário:Eduardo Morgado Belo
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 00/00390-3 - Estudo de técnicas de processamento paralelo para controle de Flutter
Beneficiário:Carlos de Marqui Junior
Modalidade de apoio: Bolsas no Brasil - Doutorado