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Worden, K.; Stansby, P.K.; Tomlinson, G.R.; Billings, S.A. (1992)
Publisher: Dept of Automatic Control and System Engineering. University of Sheffield
Languages: English
Types: Book
Subjects:
It is well known that the Morison equation has a limited capability in predicting wave forces on slender cylindrical members of offshore structures. Attempts have been made to improve prediction in both the time and frequency domains using system identification . In this paper the work to date will be reviewed. System identification requires samples of time data for force and flow velocity; considered here are data from a U-tube, the De Voorst wave flame and the Christchurch Bay tower. The results obtained in the time-domain include an improved classification of wave forces and excellent predictions of measured forces although the model structures are case specific. A series expansion for the force spectrum is proposed via the Morison-Duffing equation which promises more accurate modelling of high frequency components in the force histories for general application. This has implications for fatigue analysis.
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