Maximum Likelihood Method as a Means to Estimate the Directional Wave Spectrum and the Mean Wave Drift Force

AuthorsOlaf J. Waals, Drs. A.B.Aalbers (MARIN) and (TU Delft)
Conference/JournalOMAE Conference, Oslo
DateJan 1, 2002
Maximum likelihood method as a means to estimate the directional wave spectrum and the mean wave drift force on a dynamically positioned vessel
Feed forward in control theory is a method in which real time information about system disturbance is fed into the controller to improve its performance. As such, feed forward of the wave drift forces would improve DP behavior of a ship in terms of fuel consumption as well as position keeping. In the present study the wave drift forces have been divided in a constant part and a low frequent oscillating part. The constant part directly depends on the directional wave energy spectrum.
manoeuvring and nautical studiesstability, seakeeping and ocean engineeringwaves, impacts and hydrostructuralcfd developmentcfd/simulation/desk studiesmeasurements and controldata sciencetime-domain simulationsdynamic positioningrenewablesoil and gasinfrastructuremarine systemslife at seamodel testingloads and responsesmotionssimulationwavesoffshore engineering