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TECHNICAL PAPERS

Ocean Wave Spectral Estimation Using Vessel Wave Frequency Motions

[+] Author and Article Information
R. Pascoal

Unit of Marine Technology and Engineering, Instituto Superior Técnico, Technical University of Lisbon, Avenue Rovisco Pais, 1049-001 Lisboa, Portugalrpascoal@mar.ist.utl.pt

C. Guedes Soares

Unit of Marine Technology and Engineering, Instituto Superior Técnico, Technical University of Lisbon, Avenue Rovisco Pais, 1049-001 Lisboa, Portugalguedess@mar.ist.utl.pt

A. J. Sørensen

Department of Marine Technology, Norwegian University of Science and Technology, Otto Nielsens vei 10, N-7491 Trondheim, Norwayasgeir.sorensen@ntnu.no

J. Offshore Mech. Arct. Eng 129(2), 90-96 (Mar 28, 2006) (7 pages) doi:10.1115/1.2426986 History: Received July 21, 2005; Revised March 28, 2006

Wave spectra are estimated from wave frequency motions of a vessel at zero or low advance speed. Minimization of a cost functional that indicates how well the estimated spectrum results in the measured motion spectra was based on sequential quadratic programming and a genetic algorithm. Two procedures have been developed and applied to numerically simulated motions of a 59 m length offshore supply vessel.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Generated power spectral density contours

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Figure 2

Estimated power spectral density contours

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Figure 3

Generated power spectral density contour lines swell

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Figure 4

Estimated power spectral density contour lines swell, constrained minimization

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Figure 5

Estimated power spectral density contour lines swell, unconstrained minimization

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Figure 6

Smoothed estimate

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