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TECHNICAL PAPERS

A Contribution on Quasi-Static Mooring Line Damping

[+] Author and Article Information
Christian Bauduin, Mamoun Naciri

Single Buoy Moorings Inc., 24 Avenue de Fontvielle, PO Box 199, MC 98007 Monaco Cedex

J. Offshore Mech. Arct. Eng 122(2), 125-133 (Oct 12, 1999) (9 pages) doi:10.1115/1.533734 History: Received July 26, 1999; Revised October 12, 1999
Copyright © 2000 by ASME
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References

Huse, E., 1986, “Influence of Mooring Line Damping Upon Rig Motions,” Proc., 18th OTC Conference.
Huse, E., and Matsumoto, K., 1988, “Practical Estimation of Mooring Line Damping,” Proc., 20th OTC Conference, Paper No. 5676.
Wichers, J. E. W., and Huijsmans, R. H. M., 1990, “The Contribution of Hydrodynamic Damping Induced by Mooring Chains on Low Frequency Vessel Motions,” Proc., 22nd OTC Conference, Paper No. 6218.
Matsumoto, K., 1991, “The Influence of Mooring Line Damping on the Prediction of Low-Frequency Vessel Motions at Sea,” Proc., 23rd OTC Conference, Paper No. 6660.
Le Boulluec, M., Le Buhan, P., Chen, X-B., Deleuil, G., Foulhoux, L., Molin, B., and Villeger, F., 1994, “Recent Advances on the Slow-Drift Damping of Offshore Structures,” Proc., 8th BOSS Conference, Vol. I.
Raaijmakers, R. M., and Battjes, J. A., 1997, “An Experimental Verification of Huse’s Model on the Calculation of Mooring Line Damping,” Proceedings, 11th BOSS Conference.
Nakamura,  N., Koterayama,  W., and Kyozuka,  Y., 1991, “Slow Drift Damping due to Drag Forces Acting on Mooring Lines,” Ocean Engineering ,18, No. 4, pp. 283–296.
Dercksen, A., and Wichers, J. E. W., 1992, “A Discrete Element Method on a Chain Turret Tanker Exposed to Survival Conditions,” Proc., 6th BOSS Conference.
Webster,  W. C., 1995, “Mooring-Induced Damping,” Ocean Engineering ,22, No. 6, pp. 571–591.
Hwang, Y.-L., 1998, “Numerical Model Tests for Mooring Damping,” Proc., 17th OMAE Conference.
Brown, D., and Mavrakos, S., 1999, “Comparative Study on Mooring Line Dynamic Loading,” to be published in Journal of Marine Structure.
Bompais, X., Le Boulluec, M., Dekindt, F., Marin, S., and Molin, B., 1994, “Slow-Drift Motion: Practical Estimation of Mooring Line Damping,” Proc., 13th OMAE Conference.
Liu, Y., and Bergdahl, L., 1998, “Improvement on Huse's Model for Estimating Mooring Cable Induced Damping,” Proc., 17th OMAE Conference.
Brown, D. T., Lyons, G. J., and Lin, H. M., 1997, “Large-Scale Testing for Mooring Line Hydrodynamic Contributions at Combined Wave and Drift Frequencies,” Proc., 11th BOSS Conference.
Huse, E., and Matsumoto, K., 1989, “Mooring Line Damping Due to First and Second-Order Vessel Motions,” Proc., 21st OTC Conference, Paper No. 6137.
Huse, E., 1991, “New Developments in Prediction of Mooring System Damping,” Proc., 23rd OTC Conference, Paper No. 6593.

Figures

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Extreme mooring line configurations during one surge oscillation
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Near, mid, and far mooring line profiles
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Top view of the mooring line positions during one surge oscillation (discretization is here with N=4)
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(a) Mooring line global axes. (b) Mooring line local (x2 y2 z2) reference axes; the (x2,y2)-plane is perpendicular to the line at curvilinear abscissa s.
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Normal velocity as a function of time for an element of line I located at (a) s=711.3 m; (b) s=686.8 m; (c) s=662.2 m; (d) s=613.2 m; (e) s=539.6 m; (f) s=367.9 m. Excitation period and amplitude, respectively, 100 s and 20 m.
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Normal velocity along line I at time (a) 6.5 s; (b) 19 s; (c) 44 s. Excitation period and amplitude, respectively, 100 s and 20 m.
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Mooring system layout for the Anasuria barge
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Mooring system (lines 1–8) and risers (lines 9 and 10) layout for the FPSO Firenze
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Fraction of critical damping as a function of mean surge amplitude; (a) without current, (b) with current
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Quasi-static method versus time domain methods for low-frequency surge oscillations

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