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In order to deal with the control difficulties of the dredger's dynamic positioning system under large disturbances caused by dredging operation, a disturbances compensating dynamic surface control method is proposed to be used in the dredger's dynamic positioning system. Disturbances can be measured and compensated by the adding forces sensors. The proposed robust controller guarantees the semi-globally...
When a large ship sails on the sea, it must meet the random wave disturbances and produce complicated movement form. It is very important to consider the random wave disturbance force and moment in the ship manoeuvring simulation and ship control system design. So it is really important to research on wave signal and figure out the disturbance force and moment of ocean wave acting on ship. The wave...
Automatic marine steering is an integral part of intelligent vehicle control system. It includes course keeping and course changing. Its main purpose is to ensure that ships sail in the given direction automatically in spite of changes in sea conditions, wind and other disturbances. Fuzzy control is the well-known fact that fuzzy logic systems need no accurate mathematical models of the system under...
Because of the strong non-linearity, uncertainty and typical underactuated properties, as well as the restraints of rudder, the design of ship tracking controller is yet a challenge work. In this paper, the problem was investigated by utilizing the active disturbance rejection control (ADRC) method. Firstly, the ADRC was introduced briefly and the characteristics of ship tracking motion were analyzed...
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