The preliminary design of a differentiated compliance anchoring system (DICAS) is assessed based on stability of its slow-motion nonlinear dynamics using bifurcation theory. The system is to be installed in the Campos Basin, Brazil, for a fixed water depth under predominant current directions. Catastrophe sets are constructed in a two-dimensional parametric design space, separating regions of qualitatively different dynamics. Stability analyses define the morphogeneses occurring across bifurcation boundaries to find stable and limit cycle dynamical behavior. These tools allow the designer to select appropriate values for the mooring parameters without resorting to trial and error, or extensive nonlinear time simulations. The vessel equilibrium and orientation, which are functions of the environmental excitation and their motion stability, define the location of the top of the production riser. This enables the designer to verify that the allowable limits of riser offset are satisfied. The mathematical model consists of the nonlinear, horizontal plane fifth-order large-drift, low-speed maneuvering equations. Mooring lines are modeled by open-water catenary chains with touchdown effects and include nonlinear drag. External excitation consists of time-independent current, wind, and mean wave drift.
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February 1999
Research Papers
Preliminary Design of Differentiated Compliance Anchoring Systems
L. O. Garza-Rios,
L. O. Garza-Rios
Department of Naval Architecture and Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145
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M. M. Bernitsas,
M. M. Bernitsas
Department of Naval Architecture and Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145
e-mail: michaelb@engin.umich.edu
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K. Nishimoto,
K. Nishimoto
Department of Naval Architecture and Ocean Engineering, University of Sa˜o Paulo, Sa˜o Paulo, Brazil
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I. Q. Masetti
I. Q. Masetti
Petrobra´s Research Center/CENPES, Rio de Janeiro, Brazil
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L. O. Garza-Rios
Department of Naval Architecture and Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145
M. M. Bernitsas
Department of Naval Architecture and Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145
e-mail: michaelb@engin.umich.edu
K. Nishimoto
Department of Naval Architecture and Ocean Engineering, University of Sa˜o Paulo, Sa˜o Paulo, Brazil
I. Q. Masetti
Petrobra´s Research Center/CENPES, Rio de Janeiro, Brazil
J. Offshore Mech. Arct. Eng. Feb 1999, 121(1): 9-15 (7 pages)
Published Online: February 1, 1999
Article history
Received:
September 17, 1997
Revised:
September 11, 1998
Online:
December 17, 2007
Citation
Garza-Rios, L. O., Bernitsas, M. M., Nishimoto, K., and Masetti, I. Q. (February 1, 1999). "Preliminary Design of Differentiated Compliance Anchoring Systems." ASME. J. Offshore Mech. Arct. Eng. February 1999; 121(1): 9–15. https://doi.org/10.1115/1.2829556
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