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Influence of motion coupling and nonlinear effects on parametric roll for a floating production storage and offloading platform (Articolo in rivista)
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- Influence of motion coupling and nonlinear effects on parametric roll for a floating production storage and offloading platform (Articolo in rivista) (literal)
- Anno
- 2015-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1098/rsta.2014.0110 (literal)
- Alternative label
Greco M. 1,2; Lugni C. 1,2; Faltinsen O.M. 2 (2015)
Influence of motion coupling and nonlinear effects on parametric roll for a floating production storage and offloading platform
in Philosophical transactions - Royal Society. Mathematical, physical and engineering sciences (Online); Royal Society, London (Regno Unito)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Greco M. 1,2; Lugni C. 1,2; Faltinsen O.M. 2 (literal)
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- 1 CNR-INSEAN, The Italian Ship Model Basin, via di Vallerano 139, 00128 Rome, Italy
2 Centre for Autonomous Marine Operations and Systems (AMOS), Department of Marine Technology, NTNU, Trondheim, Norway (literal)
- Titolo
- Influence of motion coupling and nonlinear effects on parametric roll for a floating production storage and offloading platform (literal)
- Abstract
- Occurrence and features of parametric roll (PR) on
a weather-vaning floating production storage and
offloading (FPSO) platform with a turret single-point
mooring-line system are examined. The main focus is
on the relevance of motions coupling and nonlinear
effects on this phenomenon and on more general
unstable conditions as well as on the occurrence and
severity of water on deck. This work was motivated
by recent experiments on an FPSO model without
mooring systems highlighting the occurrence of
parametric resonance owing to roll-yaw coupling. A
three-dimensional numerical hybrid potential-flow
seakeeping solver was able to capture this behaviour.
The same method, extended to include the mooring
lines, is adopted here to investigate the platform
behaviour for different incident wavelengths,
steepnesses, headings, locations of the turret and pretensions.
From the results, sway and yaw tend to
destabilize the system, also bringing chaotic features.
The sway-roll-yaw coupling widens the existence
region of PR resonance and increases PR severity;
it also results in a larger amount of shipped water,
especially at smaller wavelength-to-ship length ratio
and larger steepness. The chaotic features are excited
when a sufficiently large yaw amplitude is reached.
Consistently, a simplified stability analysis showed
the relevance of nonlinear-restoring coefficients, first
those connected with the sway-yaw coupling then
those associated with the roll-yaw coupling, both
destabilizing. From the stability analysis, the system is
unstable for all longitudinal locations of the turret and pre-tensions examined, but the
instability weakens as the turret is moved forward, and the pre-tension is increased. The use
of a suitable dynamic-positioning system can control the horizontal motions, avoiding the
instability. (literal)
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