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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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.
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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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