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

Vortex-induced vibration experiments with a long semi-immersed flexible cylinder under tension modulation: Fourier transform and Hilbert-Huang spectral analyses

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Autor(es):
Franzini, Guilherme R. [1, 2, 3, 4] ; Goncalves, Rodolfo T. [1] ; Pesce, Celso P. [4] ; Fujarra, Andre L. C. [4, 1] ; Mazzilli, Carlos E. N. [3] ; Meneghini, Julio R. [2] ; Mendes, Pedro [5]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Escola Politecn, TPN Numer Offshore Tank, BR-2231 Sao Paulo - Brazil
[2] Univ Sao Paulo, Escola Politecn, NDF Fluids & Dynam Res Grp, BR-2231 Sao Paulo - Brazil
[3] Univ Sao Paulo, Escola Politecn, LMC Lab Computat Mech, BR-2231 Sao Paulo - Brazil
[4] Univ Sao Paulo, Escola Politecn, LMO Offshore Mech Lab, BR-2231 Sao Paulo - Brazil
[5] Petrobras SA, Rio De Janeiro - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Journal of the Brazilian Society of Mechanical Sciences and Engineering; v. 37, n. 2, p. 589-599, MAR 2015.
Citações Web of Science: 4
Resumo

An experimental investigation of the vortex-induced vibration phenomenon on a long semi-immersed flexible cylinder in constant current profile were carried out at a recirculating water channel facility. The experiments are part of a comprehensive research project which aims a better understanding of non-linear riser dynamics. Vertical and prescribed monochromatic harmonic motions were imposed to the top with amplitude A(t)/L approximate to 1% causing eigenfrequencies modulations. The mass ratio parameter is m{*} approximate to 10, and the ratio between the total length L and the immersed length Lim is L/Lim approximate to 3.5. The Reynolds number Re range lies within the interval 10(3) < Re <10(4). Three values of motion frequency f(t) were imposed, being them f(t) : f(N,1) - 1:3, 1:2 and 1:1 where f(N,1) is the first eigenfrequency. The application of both the Fourier Transform and the Hilbert-Huang Transform allowed identifying subharmonic components and also frequency modulation aspects in the data. (AU)

Processo FAPESP: 13/09802-2 - Estudo do escoamento ao redor de cilindros inclinados e de baixa razão de aspecto com vistas ao movimento induzido pela emissão de vórtices (MIV) de plataformas flutuantes
Beneficiário:Guilherme Rosa Franzini
Linha de fomento: Bolsas no Brasil - Pós-Doutorado