On Wave Force Analysis Using System Identification
Worden, K., Stansby, P.K., Tomlinson, G.R. et al. (1 more author)
(1992)
On Wave Force Analysis Using System Identification.
Research Report.
Acse Report 450
.
Dept of Automatic Control and System Engineering. University of Sheffield
Abstract
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.
Metadata
Item Type:
Monograph
Authors/Creators:
Worden, K.
Stansby, P.K.
Tomlinson, G.R.
Billings, S.A.
Copyright, Publisher and Additional Information:
The Department of Automatic Control and Systems Engineering research reports offer a forum for the research output of the academic staff and research students of the Department at the University of Sheffield. Papers are reviewed for quality and presentation by a departmental editor. However, the contents and opinions expressed remain the responsibility of the authors. Some papers in the series may have been subsequently published elsewhere and you are advised to cite the later published version in these instances.
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