Drillship during DP model tests in wind, waves and current


DP simulations and model R


MARIN has a long history in Dynamic


Positioning (DP) model testing and computer simulations. In recent years there has been increasing interest in the application of


DP systems. And in the past two decades the DP performance of numerous drilling vessels, semi- submersibles, installation vessels and shuttle tankers has been investigated in MARIN’s basins. Two recent projects are highlighted.


UNSIM is the DP system used in model tests. This contains all the elements present in real-life DP


systems, including a position measurement system, a Kalman filter, a controller and an allocation algorithm. For azimuthing thrusters forbidden zones are also taken into account and new options are regularly added to the model DP system. One recent improvement was the development of a new type of azimuthing thruster, with the possibility to measure not only the thruster RPMs during DP model tests but also the thrust and torque.


Eelco Frickel,


Jorrit-Jan Serraris & Hans Cozijn


j.l.cozijn@marin.nl 14 report


Time-domain simulations for DP vessels are carried out using MARIN’s multi-body simulation tool aNySIM. Results of simula- tions can be used to optimise the test programme. For example, by selecting the most relevant environmental conditions to be considered in the model tests, or by optimising the DP system control settings before the vessel actually enters the water, valuable time is saved in the basin.


Deep Water Drilling Vessel Last year, DSME commissioned MARIN to perform


79751


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