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Response-based method for determining the extreme behaviour of floating offshore platforms

Lookup NU author(s): Said Mazaheri, Professor Martin Downie


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The accurate prediction of extreme excursion and mooring force of floating offshore structures due to multi-variete environmental conditions which requires the joint probability analysis of environmental conditions for the worst case situation is still impractical as the processing of large amount of met-ocean data is required. On the other hand, the simplified multiple design criteria (e.g. the N-year wave with associated winds and currents) recommended by API known as traditional method does lead neither to the N-year platform response nor to the N-year mooring force. Therefore, in order to reduce the level of conservatism as well as uncertainties involved in the traditional method the response-based method can be used as a reliable alternative approach. In this paper this method is described. In order to perform the calculations faster using large databases of sea states, Artificial Neural Networks (ANN) is designed and employed. In the paper the response-based method is applied to a 200,000 tdw FPSO and the results are discussed. © 2004 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Mazaheri S, Downie MJ

Publication type: Article

Publication status: Published

Journal: Ocean Engineering

Year: 2005

Volume: 32

Issue: 3-4

Pages: 363-393

ISSN (print): 0029-8018

ISSN (electronic): 1873-5258

Publisher: Pergamon


DOI: 10.1016/j.oceaneng.2004.08.004


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