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Prediction of Extreme Roll Motion on an FPSO Using Long Term Statistics

[+] Author Affiliations
Tone M. Vestbo̸stad, Sverre Haver, Odd Jan Andersen

Statoil Exploration and Production, Stavanger, Norway

Arne Albert

Maritime Tentech AS, Stavanger, Norway

Paper No. OMAE2002-28117, pp. 129-136; 8 pages
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 2
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3612-6 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME


This paper presents a method for predicting extreme roll motion on an FPSO using long-term statistics. The method consists of a long-term simulation where a database of consecutive short-term sea states with combined weather conditions, including direction and magnitude of wind, wind waves and swell waves, is used. The vessel heading in given weather conditions is simulated. For each combined sea state, the short-term roll motion maxima are calculated to form a long-term probability distribution, and the extreme roll motion, e.g. the 100-year value, can be estimated from the distribution. For an example FPSO, the results from the long-term analysis have been compared with full-scale measurements, giving a validation of the method. This paper is a shortened version of [1].

Copyright © 2002 by ASME
Topics: Motion , FPSO



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