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TECHNICAL PAPERS

Experimental Investigation of Mooring Line Loading Using Large and Small-Scale Models

[+] Author and Article Information
Neil Kitney, David T. Brown

Department of Mechanical Engineering, University College London, London, United Kingdom

J. Offshore Mech. Arct. Eng 123(1), 1-9 (Nov 27, 2000) (9 pages) doi:10.1115/1.1342159 History: Received February 11, 2000; Revised November 27, 2000
Copyright © 2001 by ASME
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References

Molin,  B., 1994, “Second Order Hydrodynamics Applied to a Moored Structure—A State of Art Survey,” Schiffstechnik, 41, pp. 59–84.
Brown,  D. T., and Mavrakos,  S., 1998, “Comparative Study on Mooring Line Damping,” J. Mar. Struct., 12, No. 3, pp. 131–151.
ISSC., 1997, Proc., 13th International Ship and Offshore Structures Congress, Trondheim, Norway, August 18–22, Report of Committee I.2-Loads: Vol. 1, pp. 78–82.
Webster,  C., 1995, “Mooring Line Damping,” Ocean Eng., 22, pp. 571–591.
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. OTC, Paper 6218, Houston, TX.
Papazoglou, V. J., Mavrakos, S. A., Triantafyllou, M. S., and Brando, P., 1990, “A Scaling Procedure For Mooring Experiments,” Proc., First European Offshore Mechanics Symposium. pp. 490–498.
NTNF, 1991, “Mooring Line Damping,” FPS 2000 Research Program, Part 1.5.
Raaijmakers, R. M., and Battjes., 1997, “An Experimental Verification of Huse’s Model on the Calculation of Mooring Line Damping,” Proc. BOSS, pp. 439–452.
Papazoglou,  V. J., and Mavrakos,  S. A., 1990, “Non-Linear Cable Response and Model Testing in Water,” J. Sound Vib., 140, No. 1, pp. 103–115.
Chen, X., Wei, M., and Huang, X., 1993, “Bi-Frequency Analyses of Mooring Line Dynamics,” Proc. OMAE 1993, Vol. 1, pp. 267–273.
Koterayama, W., Nakamura, M., and Changhong, H., 1994, “Slow Drift Damping Force due to Viscous Force Acting on Mooring Lines and Floating Structure,” Proc. BOSS, pp. 97–112.
Huse, E., 1986, “Influence of Mooring Line Damping Upon Rig Motion,” Proc. OTC, Paper 5204, Houston, TX.
Suhara, T., Koterayama, W., Hiyama, H., and Koga, Y., 1987, “Approximate Analyses of Oscillation of Mooring Line,” PRADS International Symposium, pp. 247–256.

Figures

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UCL oscillation system mounted above test facility tank
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UCL mooring line suspended from triaxial load
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General arrangement of model-scale mooring line setup at CEHIPAR facility
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CEHIPAR oscillation system mounted above test facility tank
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ISSC system 1 line tension results for time domain numerical model compared with UCL and CEHIPAR experimental data. Arrows indicate range between minimum and maximum numerical prediction.
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ISSC system 1 line damping results for time domain numerical model compared with UCL and CEHIPAR experimental data. Arrows indicate range between minimum and maximum numerical prediction.
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Indicator diagram for ISSC wave drift test 2.1 using (a) CEHIPAR data, and (b) UCL data
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Indicator diagram for ISSC wave test 3.1 using (a) CEHIPAR data, and (b) UCL data
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Indicator diagram for ISSC bi-harmonic test 4.1 using (a) CEHIPAR data, and (b) UCL data
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Nondimensional dynamic tension; drift frequency oscillations, period constant at 5.5
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Nondimensional dynamic tension; wave frequency oscillations, period constant at 0.55
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Nondimensional dynamic tension; biharmonic excitation, drift amplitude, and period constant at 0.12 and 5.5, respectively
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Nondimensional dynamic tension; wave frequency oscillations, amplitude constant at 0.07
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Nondimensional dynamic tension; biharmonic excitation, drift amplitude, and period constant at 0.12 and 5.5, respectively
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Nondimensional damping; harmonic wave period constant at 0.55, biharmonic drift amplitude, and period constant at 0.12 and 5.5, respectively
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Nondimensional damping; harmonic wave amplitude constant at 0.07, bi-harmonic drift amplitude, and period constant at 0.12 and 5.5., respectively
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Indicator diagrams: (a) shows reducing wave period at constant amplitude of 0.06; (b) represents increasing wave amplitude at constant frequency of 0.55
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Indicator diagrams: (a) shows reducing superimposed wave period at constant amplitude of 0.06; (b) represents increasing superimposed wave amplitude at constant frequency of 0.55. Drift amplitude and frequency held constant at 0.12 and 5.5, respectively.

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