Numerical Simulation Of Ship's Maneuvering Motion In The Wind, Wave And Current

Ship, like other transportation vehicles, its security is the most important performance that is concerned mostly by people. With the development of shipbuilding and shipping, ship tends to move to the direction of diversification, bigger displacement and higher speed. At the same time, the container ship, LPG, VLCC and roll-roll ship appear, which have their own maneuvering character and difficulty. On the other hand, as ship's number, speed, displacement is increasing and shipping density improving, the probability of shipping accident is rising. As a result, the number of wrecking ship accounts for 0.4 percent of the whole world ship fleet, and 40 percent of the accident are correlated with the maneuverability. In the past dozens of years, shipping accidents happened frequently because of the inappropriate operation of the ship driver and bad ship maneuverability, and the ship maneuvering security is becoming a prominent issue in the world. Therefore, the International Maritime Organization (IMO) and many countries' governments are endeavoring to stipulate for the "Standard of the Ship Maneuverability". In addition, many countries' government also demand the calculation book and trial report of the ship maneuverability for the new-built ship and those ship which entering their countries' water area. On the other hand, with the development of the inland river shipping, the scale of the inland river ship and fleet become more and more huge, especially for those huge fleet which can be look on as corpulent ship with shallow draught. To ensure the security of the navigation, the special maneuverability is needed for them to passing through the bridge safely.The research field of the ship maneuverability includes the ship's movement performance and the natural and water environment (such as wind, wave, current, shallow and narrow waterways)'s influence on the ship's performance. However, estimating the ship's maneuverability and judging that if the ship has met the standard, is the foremost task in the research on ship maneuverability. In the past time, people are often concerned about the maneuverability in the still water, forexample, the course-keeping stability, turning ability and so on. But in the real navigation, ship will suffer from the influence of wind, wave and current. Furthermore, most of the maritime accidents are often happened in the atrocious weather condition, supported by the hurricane and storm. The research on the ship maneuverability in the wind, wave and current, can not only be used to optimize the maneuverability design in the ship design stage, help to understand the mechanics of ship collision and capsizal, but also guide the handling operator to improve the handling skill, guard against the sea accident. Therefore, the study is significant both theoretically and practically. As a result, the studying aim of this paper is to establish a practical and complete system for the prediction of ship maneuvering motion, taking into account of the influence of the environmental factors, such as the wind, wave and current, establish a practical and complete system for the prediction of ship maneuvering motion.In this paper, the OpenGL virtual reality simulation technique is introduced into the field of ship maneuver and control, and using the MMG mathematical model, the three dimensional dynamic simulation system of the ship motion is established and good results are achieved.In the process of the system development, firstly, the maneuvering motion equations for ship in the still water are established, based on the MMG module mathematical model and serial experimental result. After compiling the program, the calculation results are compared with the experimental data, the coherence between them validate the mathematical model. And then, to understand the sensitivity of the parameter in the MMG mathematical model to the maneuvering index, based on the above program, the author alter certain model parameters, then discuss the change of the maneuvering index, the sensitivity of the ma...