Skip to main content
European Commission logo print header
Contenido archivado el 2022-12-27

WAVE FEED-FORWARD DYNAMIC POSITIONING OF LARGE SHIPS

Objetivo

Marin has recently completed an innovative design research project to investigate the potential improvement which a wave-feed-forward dynamic positioning method may have on the dynamic positioning of a tanker type ship.
In presently available dynamic positioning systems the above mentioned wave-feed-forward capabilities are not incorporated.
The research program provides essential information for the design of a wave-feed-forward DP control system.
Calculations data report No. 47929-1-OE.
Relative motion and drift force measurement report No. 47929-2-GT Summary Phase 1 report No. 47929-3-OE
Final "wave-feed-forward" DP report No. 47929-4-GT
(Distribution restricted to participants).
Dynamic positioning of tankers at sea is becoming a viable alternative to mooring of floating production units or tankers by conventional means.
However, in the harsh environment of, for instance, the northern North Sea the capability of the DP system will be taxed to the limits due to the relatively large influence of second order wave drift forces on the vessel.
In such cases the capability of a DP system to sustain higher sea conditions can be increased using real time information which incorporates knowledge of :
- the direction of the incoming waves with respect to the ship's heading;
- the magnitude of the wave drift forces.
This information may be obtained from real time measurement of the relative wave elevation at the waterline of the vessel.
The utilization in the DP control system of the information on the wave direction and the drift force magnitude as derived from the relative motion measurement is termed "wave-feed-forward".
The report of the research program for wave-feed-forward provides information on the possibilities to obtain instantaneous information on the drift forces acting on a tanker and on the direction of the waves relative to that tanker.
Furthermore, it provides a description of how this real time information can be incorporated in the DP control system and the results of dynamic positioning experiments using wave-feed-forward carried out on model scale, showing the improvements in positioning accuracy and the effect on power consumption.
Information about the availability of the report can obtained at the Marine Research Institute Netherlands. (Adress : P. O. Box 28, 6700 AA Wageningen, The Netherlands).

Convocatoria de propuestas

Data not available

Régimen de financiación

DEM - Demonstration contracts

Coordinador

MARITIME RESEARCH INSTITUTE NETHERLANDS
Aportación de la UE
Sin datos
Dirección
HAAGSTEEG 2 P.O. BOX 28
6700 Wageningen
Países Bajos

Ver en el mapa

Coste total
Sin datos