The offshore oil exploration in Brazil has been, traditionally, made by semi-submersible and moored ship-based units. The need for more restricted wave-induced motions has demanded new conceptions of floating structures, in which the mono-column concept distinguishes itself. Due to its cylindrical shape hull, this floating unit could present a significant low frequency vibratory movement caused by the vortex shedding phenomenon. This kind of phenomenon on huge structures like platforms is usually known as VIM (Vortex Induced Motions). The main objective of this work is to evaluate a time domain methodology applied in VIM problems. This methodology uses a Van der Pol equation to represent the vortex shedding phenomenon. The force calculation schemes presented in this work are applied in physical examples and its results will be compared to model test data. The analyses were performed in a non linear dynamic analysis program, using a six degree of freedom model, developed for this study.
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ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
May 31–June 5, 2009
Honolulu, Hawaii, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4341-3
PROCEEDINGS PAPER
Time Domain Methodology for Vortex-Induced Motion Analysis in Monocolumn Platform Available to Purchase
Thiago Aˆngelo Gonc¸alves de Lacerda,
Thiago Aˆngelo Gonc¸alves de Lacerda
COPPE - Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Gilberto Bruno Ellwanger,
Gilberto Bruno Ellwanger
COPPE - Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Marcos Queija de Siqueira,
Marcos Queija de Siqueira
COPPE - Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Elizabeth Frauches Netto Siqueira
Elizabeth Frauches Netto Siqueira
CENPES - Petrobras, Rio de Janeiro, RJ, Brazil
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Thiago Aˆngelo Gonc¸alves de Lacerda
COPPE - Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Gilberto Bruno Ellwanger
COPPE - Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Marcos Queija de Siqueira
COPPE - Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Elizabeth Frauches Netto Siqueira
CENPES - Petrobras, Rio de Janeiro, RJ, Brazil
Paper No:
OMAE2009-79806, pp. 717-722; 6 pages
Published Online:
February 16, 2010
Citation
Gonc¸alves de Lacerda, TA, Ellwanger, GB, Queija de Siqueira, M, & Siqueira, EFN. "Time Domain Methodology for Vortex-Induced Motion Analysis in Monocolumn Platform." Proceedings of the ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. Volume 1: Offshore Technology. Honolulu, Hawaii, USA. May 31–June 5, 2009. pp. 717-722. ASME. https://doi.org/10.1115/OMAE2009-79806
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