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TECHNICAL PAPERS

Analytical Predictions of the Air Gap Response of Floating Structures

[+] Author and Article Information
Lance Manuel

Department of Civil Engineering, University of Texas at Austin, Austin, TX 78712e-mail: lmanuel@mail.utexas.edu

Bert Sweetman, Steven R. Winterstein

Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305

J. Offshore Mech. Arct. Eng 123(3), 112-117 (Feb 16, 2001) (6 pages) doi:10.1115/1.1372195 History: Received March 01, 2000; Revised February 16, 2001
Copyright © 2001 by ASME
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References

Winterstein, S. R., and Sweetman, B., 1999, “Air Gap Response of Floating Structures: Statistical Predictions vs Observed Behavior,” Proc. ASME Paper No. OMAE 99-6042.
WAMIT, 4.0, 1995, “WAMIT: A Radiation-Diffraction Panel Program for Wave-Body Interaction—Users’ Manual,” Department of Ocean Engineering, M.I.T., Cambridge, MA.
Naess,  A., 1986, “The Statistical Distribution of Second-Order Slowly Varying Forces and Motions,” Appl. Ocean. Res., 8, pp. 110–118.
Naess, A., 1992, “Prediction of Extremes Related to the Second-Order, Sum-Frequency Responses of a TLP,” Proc. 2nd International Offshore Polar Engineering, ISOPE, pp. 436–443.
Winterstein, S. R., Ude, T. C., and Kleiven, G., 1994, “Springing and Slow-Drift Responses: Predicted Extremes and Fatigue vs. Simulation,” Proc., BOSS-94, Vol. 3, pp. 1–15.
Winterstein,  S. R., 1988, “Nonlinear Vibration Models for Extremes and Fatigue,” J. Eng. Mech., ASCE, 114, No. 10, pp. 1772–1790.
Crandall, S. H., and Mark, W. D., 1963, Random Vibration in Mechanical Systems, Academic Press, New York, NY.
Ude, T. C., Kumar, S., and Winterstein, S. R., 1996, “TFPOP 2.1: Stochastic Response Analysis of Floating Structures under Wind, Current, and Second-Order Wave Loads,” Technical Report RMS-18, Reliability of Marine Structures Program, Stanford University, Stanford, CA.
Winterstein,  S. R., Jha,  A. K., and Kumar,  S., 1999, “Reliability of Floating Structures: Extreme Response and Load Factor Design,” J. Water, Port, Coastal and Ocean Engineering, ASCE, 125, No. 4.
Jha, A. K., De Jong, P. R., and Winterstein, S. R., 1997, “Motions of a Spar Buoy in Random Seas: Comparing Predictions and Model Test Results,” Proc., BOSS-97, Vol. 2, pp. 333–347.
Manuel, L., and Winterstein, S. R., 1998, “Estimation of Air Gap Statistics for Floating Structures: Release of TFPOP Version 2.2—A Computer Program for Performing Stochastic Response Analysis of Floating Structures,” Technical Note TN-4, Reliability of Marine Structures Program, Stanford University.

Figures

Grahic Jump Location
Veslefrikk air gap response (peak factor in 3 h)—measurements versus analytical predictions at nine different field points for two seastates; Hs=12 and 14 m
Grahic Jump Location
Plan view showing four columns of the Troll semi-submersible and the three field points (Nos. 1, 5, and 6) studied
Grahic Jump Location
Definition of the instantaneous air gap, a(t), in terms of the net wave elevation and the net vertical displacement

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