Hydrodynamic Forces in Low speed and Station-Keeping Model Test of DP Vessels

摘要

The low speed maneuvering model is very important in the simulationfor maneuvering ships in the following actions like Harbour Berthing,Dynamic Positioning operations, Pipe Laying, Offloading, etc. So theprecise hydrodynamic forces estimation in low speed and high yawangle is highly required.In this paper some aspects of the hydrodynamic forces for one marinevessel and low speed model are considered. The non-dimensionalhydrodynamic force coefficients are obtained form captive model test.It can offer reference to the low speed ship maneuvering researchers.Dynamic positioning system is a closed-loop control system whichprovides the control action according to the measured signal to resistthe disturbance of wind, wave and current. The objective of this systemis to let the marine vessel maintain at a fixed position and heading in ahorizontal plane. This thesis developed software for simulation for DPvessels. Finally the performance of the control system is validated inpractice by experimentation with a model ship.