The paper discusses a method for estimating extreme value statistics of the airgap for floating offshore platforms subjected to random seas. It is an adaptation of a recently developed method, which is based on the mean upcrossing rate (MUR) function for univariate time series combined with an optimization procedure that allows prediction at extreme response levels by extrapolation. Extensive model tests were performed in a large wave basin for a tension leg platform (TLP) operating in the Norwegian Sea. Among several critical parameters, the airgap was measured at a number of locations under the platform deck. The wave in deck impact is a critical safety issue with respect to the deck damage and occurrence of extreme tether tensions. The authors have utilized experimental data to look at critical airgaps under the deck in random waves. Conclusions are drawn about extreme airgap statistics, and consequently about the wave impact probability in severe seas.
Airgap Statistics for a Tension Leg Platform
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 30, 2013; final manuscript received July 3, 2014; published online October 21, 2014. Assoc. Editor: Lance Manuel.
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Gaidai, O., Naess, A., and Stansberg, C. T. (October 21, 2014). "Airgap Statistics for a Tension Leg Platform." ASME. J. Offshore Mech. Arct. Eng. February 2015; 137(1): 011602. https://doi.org/10.1115/1.4028734
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