抄録
Dynamic positioning systems have been developed to hold the position of platforms and vessels against external disturbances such as winds and currents by using rotating thrusters, in offshore oil exploitations in place of anchoring systems.
In this paper, in order to make an approach for a vessel having a bow- and a stern-thruster to better the dynamic position control for a drastic wind-force disturbance, detailed investigations were carried out on the on-line selection technique of the PID-type controllers' gain sets. Evaluation of the technique was made on the basis of computer simulations by use of ship motion theory and model test results. It is clarified that the technique will substantially provide an efficient way to the better control performance of dynamic positioning systems.
