The roll motions are a key parameter on the design of FPSOs that operate in moderate and severe environmental conditions. To reduce the magnitude of roll motions, some techniques based on changing the vertical position of gravity center are used to put the roll natural period outside of the frequency range of the linear waves. However, recent model tests and also numerical calculations have shown that the vessel may still experience large roll motions which are considered to be induced by second-order wave loads. Further to the work in Rezende et al. (2007) to compute the roll response in frequency domain, new developments to perform simulations in time domain are presented here. In this new method, variations of second-order roll moments dependent on the roll and heave motions are taken into account consistently. It is shown that, unlike the horizontal loads, the quadratic transfer functions of the vertical loads depend on the instantaneous position of the vessel. The variation of the roll moment with the heave position of the vessel has been considered more important than the variation obtained only with the inclination of the vessel. Furthermore, numerical results of roll simulations are compared with model tests results and presented in the paper.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4818-0
PROCEEDINGS PAPER
Simulation of Second-Order Roll Motions of a FPSO
Fla´via Rezende,
Fla´via Rezende
Bureau Veritas, Paris La De´fense, France
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Xiao-Bo Chen,
Xiao-Bo Chen
Bureau Veritas, Paris La De´fense, France; HEU, China
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Marcos D. Ferreira
Marcos D. Ferreira
PETROBRAS, Rio de Janeiro, RJ, Brazil
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Fla´via Rezende
Bureau Veritas, Paris La De´fense, France
Xiao-Bo Chen
Bureau Veritas, Paris La De´fense, France; HEU, China
Marcos D. Ferreira
PETROBRAS, Rio de Janeiro, RJ, Brazil
Paper No:
OMAE2008-57405, pp. 355-361; 7 pages
Published Online:
July 27, 2009
Citation
Rezende, F, Chen, X, & Ferreira, MD. "Simulation of Second-Order Roll Motions of a FPSO." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 1: Offshore Technology. Estoril, Portugal. June 15–20, 2008. pp. 355-361. ASME. https://doi.org/10.1115/OMAE2008-57405
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