Tuning of transfer functions for analysis of wave-ship interactions

Ulrik D. Nielsen*, Raphaël E.G. Mounet, Astrid H. Brodtkorb

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Transfer functions are often used together with a wave spectrum for analysis of wave–ship interactions, where one application addresses the prediction of wave-induced motions or other types of global responses. This paper presents a simple and practical method which can be used to tune the transfer function of such responses to facilitate improved prediction capability. The input to the method consists of a measured response, i.e. time series sequences from a given sensor, the 2D wave spectrum characterising the seaway in which the measurements are taken, and an initial estimate of the transfer function for the response in study. The paper presents results obtained using data from an in-service container ship. The 2D wave spectra are taken from the ERA5 database, while the transfer function is computed by a simple closed-form expression. The paper shows that the application of the tuned transfer function leads to predictions which are significantly improved compared to using the transfer function without tuning.
Original languageEnglish
Article number103029
JournalMarine Structures
Volume79
Number of pages21
ISSN0951-8339
DOIs
Publication statusPublished - 2021

Keywords

  • Wave-induced ship motions
  • Transfer functions
  • Wave spectrum
  • Tuning coefficient
  • Ship motion prediction

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