A model of significant wave height for reliability assessment of a ship

• Published in: Journal of Marine Systems
• Main Authors: Podgorski, Krzysztof, Rychlik, Igor
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2014
• Subjects: Probability Theory and Statistics; Significant wave heights; Hundred years wave; Fatigue damage; Narrow; band approximation; Rainflow cycles; Level crossings; North Atlantic
• Online Access: https://lup.lub.lu.se/record/4255808; https://doi.org/10.1016/j.jmarsys.2013.03.006

Significant wave heights are modeled by means of a spatial-temporal random Gaussian field. Its dependent structure can be localized by introduction of time and space dependent parameters in the spectrum. The model has the advantage of having a relatively small number of parameters. These parameters have natural physical interpretation and are statistically fitted to represent variability of observed significant wave height records. The fitted spatial-temporal significant wave field allows for prediction of fatigue accumulation in ship details and of extreme responses encountered. The method is exemplified by analyzing a container ship data relevant for North Atlantic trade and the results show a high agreement with actual on-board measurements. (C) 2013 Elsevier B.V. All rights reserved.