| With the continued exploitation of the ocean by human extended to the deep sea, the traditional mooring system can not meet the operational requirements of ship positioning in the deep sea areas, therefore, dynamic positioning system came into being. The basic role of dynamic positioning is to maintain the position and heading of the marine structures, and providing a stable operating environment for the exploration of oil and gas proceed smoothly. The biggest characteristic of the marine environment is unpredictability and random, dynamic positioning is to be able to offset the effect of external low-frequency loads, and prevent the slow drift movement of the marine structures. Now, the dynamic positioning vessel has been put into application, and has a good practicality and economy, shows the broad prospects of the dynamic positioning applications.In this paper, we have the high-power deep-sea oil platform support vessels (OSV) building by Zhenjiang Shipyard as research object, analysis the OSV's dynamic positioning system, mainly on study of the dynamic positioning control method, the study of dynamic positioning control method relied on accurate ship motion mathematical model, so at first, studied the characteristics of ship motion mathematical model and the mathematical model of marine environment, with the OSV as research object, according to the specific characteristics of OSV, established a mathematical model of OSV's, and simulated the OSV's handling movement, and compared with the real ship test to verify the correctness of the mathematical model and exploratory study a fast positioning control method based on the mathematical model, this method is simulated, the simulation results show the rationality of this control method. This paper have studied the dynamic position control system of the OSV, the main work as follow:1,Research on the basic theoretical knowledge of ship motion and modeling, to understand the motion characteristics of ships, ship motion mathematical model and the marine environment mathematical model is the basis of dynamic positioning technology, choose the right coordinate system, determine the mathematical model used to control system and Ship motion simulation, it is the theoretical basis for research. In this paper, we have the survey of the ship and the actual sea conditions, analysis of the relationship between ship motion and the mathematical model, and study the mathematical model of the marine environment, established a suitable dynamic positioning movement mathematical model of OSV, developed the simulation program by the MATLAB language, the simulation results were compared with the actual ship tests to verify the correctness of the mathematical model.2,We have discussed the measurement system of the OSV's dynamic positioning, dynamic positioning system achieved the required position, heading, wind speed and wind direction and other informations by measuring devices. Through analysis of the dynamic positioning measurement system, we discussed the operational principle of position measurement, heading and wind speed and direction indicator, and through the analysis of the OSV, get a suitable measurement system for dynamic positioning.3,Analysed the dynamic positioning control system, and some of the commonly used methods of control theory and control method, get the advantages and shortcomings, according to the specific characteristics of the OSV in the operations, we exploratory study a kinds of rapid positioning control method, and the need of some factors for the control were studied, and finally this control method is simulated through the MATLAB software, theoretically proved that the dynamic positioning control method is effective and reasonable.Based on the simulation of the ship, get the following conclusions:1,Through the simulation of OSV's dynamic positioning mathematical model, we obtained the effect of ship movements by hydrodynamic derivatives, provied the reference for improve the accuracy of ship motion mathematical model.2,Exploratory developed a rapid positioning method, from the simulation results, it has a good control effect, meet the requirements of OSV's positioning operations. The work has a certain reference value on the ship fixed point dynamic positioning control, and also laid the foundation for further research in this field. |
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