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Global wave load combinations by cross-spectral methods

Lookup NU author(s): Emmanuel Alfred Mohammed, Dr Hoi-sang Chan

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Abstract

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.

Publication metadata

Author(s): Mohammed EA, Chan HS, Hirdaris SE

Publication type: Article

Publication status: Published

Journal: Marine Structures

Year: 2012

Volume: 29

Issue: 1

Pages: 131-151

Print publication date: 01/12/2012

ISSN (print): 0951-8339

ISSN (electronic): 1873-4170

Publisher: Elsevier Ltd

URL: http://dx.doi.org/10.1016/j.marstruc.2012.10.005

DOI: 10.1016/j.marstruc.2012.10.005

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