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Ocean Wave Spectral Estimation Using Vessel Wave Frequency Motions

[+] Author Affiliations
R. Pascoal, C. Guedes Soares

Technical University of Lisbon, Lisboa, Portugal

A. J. So̸rensen

Norwegian University of Science and Technology, Trondheim, Norway

Paper No. OMAE2005-67584, pp. 337-345; 9 pages
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 2
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4196-0 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME


Parametric and non-parametric spectral descriptions are used to estimate the wave spectra from wave frequency motions of a vessel at low advance speed, using minimization procedures based on a constrained gradient search and a genetic algorithm. The parametric description provides smooth power spectral energies as a result of the analytic spectral description. The non-parametric requires a smoothing post processing if very good readability is needed. It has been concluded that the non-parametric description is faster, more robust to model errors and likely to be a better formulation for adaptive algorithms.

Copyright © 2005 by ASME



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