Spectral response surfaces, designer waves and the ringing of offshore structures

Peter S. Tromans*, I. Ketut Suastika

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

5 Citations (Scopus)


The purpose of this paper is to apply the spectral response surface method to the ringing problem. We have re-formulated Newman's results for diffraction force on a column in terms of the frequency components of the ocean surface and their Hilbert transforms. The resulting expression, together with a single degree of freedom model for the structure, allows us to generate hyper-surfaces of constant dynamic response as functionals in the Hilbert space of the spectral components of the ocean surface. As the components are uncorrelated, linear processes, it is straightforward to treat the response surfaces as limit states in a FORM (first order reliability method) type of analysis. This provides a very efficient means of calculating the ocean surface history most likely to generate an extreme ringing response (the `designer wave' for ringing) and the ringing response history.

Original languageEnglish
Number of pages8
Publication statusPublished - 1998
Externally publishedYes
EventProceedings of the 1998 International OTRC Symposium - Houston, TX, USA
Duration: 30 Apr 19981 May 1998


ConferenceProceedings of the 1998 International OTRC Symposium
CityHouston, TX, USA


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