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Lookup NU author(s): Emmanuel Alfred Mohammed,
Dr Hoi-sang Chan
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This paper presents a cross spectral stochastic analysis methodology for the determination of the combination of global wave-induced dynamic loads by taking into account uncertainties associated with the wave heading, the joint probabilities of the wave environment and the correlations between different global wave-induced dynamic loads. The methodology considers the use of bivariate probability density functions (the cross-spectral probabilistic approach) or the co-variances of two random variables with their associated derivatives (the cross-spectral Hamilton's method) and assumes only rigid body hydrodynamic actions under steady forward speed conditions. The design extreme values of principal global wave-induced load components and their combinations for a container ship progressing in irregular seaways are predicted using these two cross-spectral methods together with the short-term and long-term statistical formulations. It is shown that in general terms both cross-spectral analysis methods can be employed to assess the effects of loads in ship design and reliability analysis. However, the cross-spectral Hamilton's method predicts slightly higher load combinations than the cross-spectral probabilistic approach. (C) 2012 Elsevier Ltd. All rights reserved.
Author(s): Mohammed EA, Chan HS, Hirdaris SE
Publication type: Article
Publication status: Published
Journal: Marine Structures
Print publication date: 01/12/2012
ISSN (print): 0951-8339
ISSN (electronic): 1873-4170
Publisher: Elsevier Ltd
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