Analytical Predictions of the Air Gap Response of Floating Structures-Reference-Cited by-同舟云学术

Analytical Predictions of the Air Gap Response of Floating Structures

Published:2001-02-16 Issue:3 Volume:123 Page:112-117
ISSN:0892-7219
Container-title:Journal of Offshore Mechanics and Arctic Engineering
language:en
Short-container-title:

Author:

Manuel Lance¹,Sweetman Bert²,Winterstein Steven R.²

Affiliation:

1. Department of Civil Engineering, University of Texas at Austin, Austin, TX 78712

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

Abstract

Two separate studies are presented here that deal with analytical predictions of the air gap for floating structures. 1) To obtain an understanding of the importance of first and second-order incident and diffracted wave effects as well as to determine the influence of the structure’s motions on the instantaneous air gap, statistics of the air gap response are studied under various modeling assumptions. For these detailed studies, a single field point is studied here—one at the geometric center (in plan) of the Troll semi-submersible. 2) A comparison of the air gap at different locations is studied by examining response statistics at different field points for the semi-submersible. These include locations close to columns of the four-columned semi-submersible. Analytical predictions, including first and second-order diffracted wave effects, are compared with wave tank measurements at several locations. In particular, the gross root-mean-square response and the 3-h extreme response are compared.

Publisher

ASME International

Subject

Mechanical Engineering,Ocean Engineering

Link

http://asmedigitalcollection.asme.org/offshoremechanics/article-pdf/123/3/112/5480915/112_1.pdf

Reference11 articles.

1. 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.

2. 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.

3. Naess, A. , 1986, “The Statistical Distribution of Second-Order Slowly Varying Forces and Motions,” Appl. Ocean. Res., 8, pp. 110–118.

4. 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.

5. 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.

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