To predict the capability of dynamic positioning systems on floating objects, the existing procedures and strategies are primarily focused on the power consumption minimisation, treating of numerous limitations and conditions that should be satisfied at the same time. On the other hand, when the extreme limits of the system must be predicted other factors are of primary importance instead of minimal power consumption. Thruster interaction effect such as axial and transverse flow acting on the propeller disc, thruster-hull interaction, thruster-thruster interaction and ventilation are relevant and rarely taken into account. These effects, whether they occur separately or in combinations, can cause significant thrust losses, which could consequently degrade reliability of dynamic positioning systems. Different allocation strategies were studied to take the above mentioned effects into account. Here, a smart thrust allocation strategy has been developed to maximise the DP capability of vessels during operations in heavy weather conditions. The main goal of this paper is the quantification of the effects due to thruster interaction on the resulting DP capability predictions of the vessel. Applications to two existing offshore vessels have been considered to highlight different allocation strategies on the resulting DP capability plots in terms of operational rosettes.

Smart Thrust Allocation Procedures in Early Design Stage Dynamic Positioning Predictions

NABERGOJ, RADOSLAV;MAURO, FRANCESCO
2015

Abstract

To predict the capability of dynamic positioning systems on floating objects, the existing procedures and strategies are primarily focused on the power consumption minimisation, treating of numerous limitations and conditions that should be satisfied at the same time. On the other hand, when the extreme limits of the system must be predicted other factors are of primary importance instead of minimal power consumption. Thruster interaction effect such as axial and transverse flow acting on the propeller disc, thruster-hull interaction, thruster-thruster interaction and ventilation are relevant and rarely taken into account. These effects, whether they occur separately or in combinations, can cause significant thrust losses, which could consequently degrade reliability of dynamic positioning systems. Different allocation strategies were studied to take the above mentioned effects into account. Here, a smart thrust allocation strategy has been developed to maximise the DP capability of vessels during operations in heavy weather conditions. The main goal of this paper is the quantification of the effects due to thruster interaction on the resulting DP capability predictions of the vessel. Applications to two existing offshore vessels have been considered to highlight different allocation strategies on the resulting DP capability plots in terms of operational rosettes.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2847182
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