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港内拖轮协助操船工况下本船极限航速的研究
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摘要
本文结合船舶操纵运动数学模型,就港内拖轮协助操船工况下本船的极限航速这一问题进行了深入的研究。
     本文采用MMG分离建模的思想建立了一个较为精确、较为完整的适用于港内拖轮协助操船工况下的运动数学模型。分别考虑了船体、桨和舵上的力及力矩,以及三者相互之间的干涉;充分考虑了港内操纵浅水和低速两个特点;考虑了拖轮桨推力、受到的流体动力以及大船与拖轮之间的相互作用力三者之间的关系。论文对模型的算法——龙格—库塔法和梯度法作了详尽的讨论。采用C++语言和MATLAB数学软件混合编程,对船舶操纵性试验进行了仿真计算。本文对拖轮顶推大船船首一侧工况下本船的极限航速进行了定量分析。详细讨论了船舶排水量、装载状态、水深吃水比和拖轮功率与极限航速的关系,并给出极限航速估算图谱以及相应的回归公式。
     通过本论题的研究,得出以下结论:
     船舶排水量的增加,水深变浅,极限航速都将减小,且这种减小的趋势较为明显;增加拖轮功率,极限航速将增大,但增大的趋势并不十分明显。
     本文的研究结果为引航员和船长安全地控制拖轮助操工况下本船的航速提供了参考依据,为船舶操纵安全评估提出了新的研究方向,也为船舶操纵模型器的研制与开发提供了新思路。
This thesis explores the vessel maximum velocity with tugboat assistance in harbor based on the ship maneuvering mathematical model.
    According to the MMG's separated modeling theory, an integrated mathematical model is established, which can be applied to ship maneuvering with tugboat assistance in harbor. The model has taken in account the following factors: hydrodynamic forces and moments acting on the hull, propeller and rudder of the vessel, and the hydrodynamic interaction among them; the characteristics of the maneuverability in shallow water and in low speed; the variable forces and moments acting on the tugboat. The paper also elaborates on the calculating method, the Runge-Kutta method and the Grads method. By integrating C++ with MATLAB through the programming process, the research simulates the trials on the ship maneuverability.
    The thesis presents a quantitative analysis of the maximum velocity with tugboat assistance at the fore part of vessel. Grounded on a comprehensive discussion of the effects of tonnage, loading condition, ratio of water depth to draft and tugboat power, the thesis puts forward the assessment curves as well as the regression formulae.
    The study has obtained the following conclusion: the increase of tonnage or the decrease of water depth will lead to an obvious decrease of the maximum velocity, while the increase of the tugboat power causes an unconspicuous increase of the maximum velocity.
    The research provides with the reference for the pilots and captains on safe control of the vessel maximum velocity with tugboat assistance. It brings forward a new research field in safety assessment of vessel operation, and a new idea to develop the ship-handling simulator.
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