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Deterministic non-linear wave forecast and motion prediction for short-term offshore operations
Publikationstyp
Conference Paper
Date Issued
2015-01-01
Sprache
English
TORE-URI
Volume
2015-January
Start Page
1236
End Page
1244
Citation
International Offshore and Polar Engineering Conference: 1236-1244 (2015-01-01)
Contribution to Conference
This paper presents a time-domain decision support system based on deterministic, non-linear wave forecast and motion prediction for short-term offshore operations. The system consists of three individual constituents: sea state registrations, non-linear wave forecast and motion prediction. Surface elevation snapshots taken continuously by a ship board radar at great distance ahead the operational area are preprocessed by the wave monitoring system WaMoS II1 and used as input for the wave forecast tool. The non-linear wave propagation is modelled by applying the Higher Order Spectral Method (HOSM), which offers high accuracy and fast calculation time at once. The predicted surface elevation at the location of operation are used for the evaluation of the corresponding offshore structure response. For this purpose, Impulse Response Functions are implemented, which enable the fast determination of the response in time domain. The focus of the present study lies on the evaluation of the non-linear wave forecast and motion prediction part of the proposed decision support system. For illustrating the efficiency of the process, an offshore crane operation is investigated. The accuracy of the predicted (future) surface elevation as well as response of the multi-body problem is evaluated against model tests in the controlled environment of a seakeeping basin.
Subjects
Decision support system
HOSM
IRF
Motion prediction
Non-linear wave forecast