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Article

Coupled Analysis of a Spar Structure: Monte Carlo and Statistical Linearization Solutions

[+] Author and Article Information
Pol D. Spanos

Rice University, Houston, TX 77005e-mail: Spanos@rice.edu

Rupak Ghosh

Rice University, Department of Civil Engineering, Houston, TX 77005e-mail: RGhosh@Technip.com

Lyle D. Finn

Technip, 11700 Old Katy Rd, 150 Houston, TX 77079e-mail: LFinn@Technip.com

John Halkyard

Technip, 11700 Old Katy Road, 150, Houston, TX 77079e-mail: JHalkyard@Technip.com

J. Offshore Mech. Arct. Eng 127(1), 11-16 (Mar 23, 2005) (6 pages) doi:10.1115/1.1862253 History: Received January 08, 2004; Revised November 05, 2004; Online March 23, 2005
Copyright © 2005 by ASME
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References

Ran,  Z., Kim,  M. H., and Zheng,  W., 1999, “Coupled Dynamic Analysis of a Moored Spar in Random Waves and Currents (Time Domain vs. Frequency Domain Analysis),” Trans. ASME,121, pp. 194–200.
Ran,  Z., and Kim,  M. H., 1997, “Nonlinear Coupled Responses of a Tethered Spar Platform in Waves,” Int. J. Offshore and Polar Eng.,7, pp. 111–118.
Gupta, H., Finn, L., and Weaver, T., 2000, “Effects of Spar Coupled Analysis,” Proceedings of the Offshore Technological conference, Vol. 2, pp. 629–638.
Spanos, P. D., Ghosh, R., Finn, L. D., and Halkyard, J. E., 2002, “Stochastic Dynamic Analysis of a Spar Structure Coupled With Top Tensioned Risers and Mooring Lines,” 4th International Conference on Computational Stochastic Mechanics, Corfu, Greece, pp. 583–589.
Pauling, J. Randolph, Inc., 1995, “MLTSIM: Time Domain Platform Simulation for Floating Platform Consisting of Multiple Interconnected Bodies,” Geyserville, California.
Mekha, B. B., Johnson, C. P., and Roesset, J. M., 1995, “Nonlinear Response of a Spar in Deep Water,” Proceedings of the 5th International Offshore and Polar Engineering Conference, Vol. 3, The Hauge, ISOPE, pp. 462–469.
Ran,  Z., Kim,  M. H., Niedzwecki,  J. M., and Johnson,  R. P., 1995, “Responses of a Spar Platform in Random Waves and Currents (Experiment vs. Theory),” Int. J. Offshore and Polar Eng.,6, pp. 27–34.
Chakrabarti, S. K., 1987, Nonlinear Methods in Offshore Engineering, Elsevier Science, New York.
Sarpkaya, T., and Issacson, M., 1981, Mechanics of Wave Forces on Offshore Structures, Van Nostrand Reinhold, New York.
Roberts, J. B., and Spanos, P. D., 1990, Random Vibrations and Statistical Linearizations, Wiley, New York, 2003.
Donley,  M. G., and Spanos,  P. D., 1991, “Stochastic Response of a Tension Leg Platform to Viscous Drift Force,” J. Offshore Mechanics and Arctic Engineering, ASME,113, pp. 148–155.
Spanos,  P. D., and Donley,  M. G., 1991, “Equivalent Statistical Quadratization for Nonlinear System,” J. Eng. Mech., 117, pp. 1289–1310.

Figures

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Mooring line load-displacement plot for different vertical displacements
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Variation of frictional coefficient
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(a) Truss Spar; (b) Simplified 3-d-o-f model of Spar; (c) Preload and the frictional force at the interface
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PSD of the surge response and force
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PSD of the heave response and force
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PSD of the pitch response and moment
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Probability density of the surge response
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Probability density of the heave response
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Probability density of the pitch response
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Time histories comparison of surge
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Time histories comparison of heave; Comparison of the surge responses
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Comparison of the surge responses
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Comparison of the heave responses
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Comparison of the pitch responses

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