Efficient Mooring Line Fatigue Analysis Using a Hybrid Method Time Domain Simulation Scheme

Niels Hørbye Christiansen, Per Erlend Torbergsen Voie, Jan Becker Høgsberg, Nils Sødahl

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Dynamic analyses of mooring line systems are computationally expensive. Over the last decades an extensive variety of methods to reduce this computational cost have been suggested. One method that has shown promising preliminary results is a hybrid method which combines finite element analysis and artificial neural networks (ANN). The present study presents a novel strategy for selecting, arranging and normalizing training data for an ANN. With this approach one ANN can be trained to perform high speed dynamic response prediction for all fatigue relevant sea states and cover both wave frequency motion and slow drift motion. The method is tested on a mooring line system of a floating offshore platform. After training a full fatigue analysis is carried out. The results show that the ANN with high precision provides top tension force histories two orders of magnitude faster than a full dynamic analysis. Copyright © 2013 by ASME.
Original languageEnglish
Title of host publicationASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
Number of pages10
Volume1
PublisherAmerican Society of Mechanical Engineers
Publication date2013
Article numberOMAE2013-10682
ISBN (Print)978-0-7918-5531-7
DOIs
Publication statusPublished - 2013
Event32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013) - Nantes, France
Duration: 9 Jun 201314 Jun 2013
Conference number: 32

Conference

Conference32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013)
Number32
CountryFrance
CityNantes
Period09/06/201314/06/2013

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