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A Spectral Response Surface Method for Calculating Crest Elevation Statistics

[+] Author Affiliations
Peter S. Tromans

Imperial College London, London, England

Luc Vanderschuren

Engineering Systems, Louvain-la-Neuve, Belgium

Paper No. OMAE2002-28535, pp. 617-620; 4 pages
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 2
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3612-6 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME


The statistics of wave crest elevation in a random, directionally spread sea are calculated using a novel approach. The non-linearity of steep waves is modelled to second order using Sharma and Dean kinematics and a spectral response surface method is used to deduce the crest elevation corresponding to a given probability of exceedance. The spectral response surface method works in the probability domain, making it several times faster than conventional time domain simulation of random waves. However, the results from the two methods show good agreement. As expected, non-linearity makes extreme crests higher than the corresponding linear ones.

Copyright © 2002 by ASME



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