Wave Direction Feed-Forward on Basis of Relative Motion Measurements To Improve Dynamic Positioning Performance
Author A.B. Aalbers and U. Nienhuis (MARIN)
Title Wave Direction Feed-Forward on Basis of Relative Motion Measurements To Improve Dynamic Positioning Performance
Conference/Journal Offshore Technology Conference (OTC), Houston
Paper no. OTC1987-5445
Month May
Year 1987

Abstract
A method is described which may improve the dynamic positioning of large ships im wind and waves, especially in case of non-parallel wind and wave directions. The proposed method applies the measurement of relative motions at two opposite side locations to estimate the wave direction and the wave drift force level. Combination with the wind measurement leads to an optimum heading set-point. The potential improvements are illustrated by results of tests and dynamic positioning simulations.

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