Response-Based Estimation of Sea State Parameters

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Abstract

Reliable estimation of the on-site sea state parameters is essential to decision support systems for safe navigation of ships. The sea state parameters can be estimated by Bayesian Modelling which uses complex-valued frequency response functions (FRF) to estimate the wave spectrum on the basis of measured ship responses. It is therefore interesting to investigate how the filtering aspect, introduced by FRF, affects the final outcome of the estimation procedures. The paper contains a study based on numerical generated time series, and the study shows that filtering has an influence on the estimations, since high frequency components of the wave excitations are not estimated as accurately as lower frequency components. Moreover, the paper investigates how the final outcome of the Bayesian Modelling is influenced by the accuracy of the FRF. Thus, full-scale data is analysed by use of FRF calculated by a 3-D time domain code and by closed-form (analytical) expressions, respectively. Based on comparisons with wave radar measurements and satellite measurements it is seen that the wave estimations based on closedform expressions exhibit a reasonable energy content, but the distribution of energy appears to be incorrect.
Original languageEnglish
Title of host publicationProceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering
Publication date2007
ISBN (Print)0-7918-3799-8
Publication statusPublished - 2007
Event26th International Conference on Offshore Mechanics and Arctic Engineering - San Diego, CA, United States
Duration: 10 Jun 200715 Jun 2007
Conference number: 26

Conference

Conference26th International Conference on Offshore Mechanics and Arctic Engineering
Number26
CountryUnited States
CitySan Diego, CA
Period10/06/200715/06/2007

Cite this

Nielsen, U. D. (2007). Response-Based Estimation of Sea State Parameters. In Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering