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In this paper, a new adaptive fuzzy controller is proposed for the dynamic positioning system of vessels with unknown time-varying dynamic model parameters and environmental disturbances. This controller comprises of an adaptive fuzzy logic and the dynamic surface control (DSC) technique. The adaptive fuzzy system is used to estimate the uncertainties induced by unknown dynamic model parameters and...
A cable laying ship is a deep-sea vessel designed and used to lay underwater cables for telecommunications, electricity, and such. Cable ships are distinguished by large cable sheaves for guiding cable over bow or stern or both. The movement of the cable and the influence of the cable tension on the movement of the cable laying ship are two key problems to be solved during the cable laying operation...
It is well known that the wave motion is a really complex process and hard to be simulated. The paper mainly solves the difficult problem of numerical simulation of wave disturbances in ship motion simulation area. The wave disturbance force and moment acting on the ship sailing on the sea are simulated. Based on statistics superposition theory, Pierson-Moskowitz (P-M) single-parameter standard wave...
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...
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