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Study on a High Speed Semi-Submersible Ship.

高速半潜船研究。

基本信息

批准号：
01460168
负责人：
MORI Kazu-hiro
金额：
$ 1.54万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

In the present project, three items related to the high speed ship are mainly studied ; (1) free-surface flow computation by the boundary element method, (2) model experiments for the stable running and motion control, and (3) reduction of the frictional resistance by micro-bubble injection. Following conclusions and findings are mentioned.1. Some new methods are introduced for the treatments of free-surface, downstream and Kutta conditions and it is proved that the method is effective. Several cases for the semi-submersible high-speed ship are simulated to find interesting phenomena on the interaction between the submerged lifting surface and free-surface flows.2. An experiment to confirm stable running is carried out by making use of a towed model where heaving, pitching and rolling motions are free and the PD control is introduced. A free running test where all the motions are free is also carried out to confirm that a stable running is assured if a control is introduced properly. The sea-worthiness of the semi-submerged ship is proved good through the experiments among waves.3. An experiment is carried out by marking use of a separable model to determine the reduction of resistance due to the micro-bubble injection. The resistance reduces when the velocity and the quantity are above a certain level. However, the required work to inject the bubble is larger than the saved resistance because of the small size of the model. This may not be serious for the actual ship.Through the present studies on the hydrodynamic aspects of the high-speed semi-submersible ship, it can be concluded that such a type of high speed ship is prospective. More experiments on free running are necessary for further studies.

在本项目中，主要研究了与高速船舶相关的三个项目；(1)边界元法自由面流动计算；(2)稳定运行和运动控制模型实验；(3)微泡注入减小摩擦阻力。以下结论和发现被提及。介绍了一些处理自由面、下游和库塔条件的新方法，并证明了该方法的有效性。通过对半潜式高速船的几个实例进行仿真，发现了水下升力面与自由水面流相互作用的有趣现象。利用无起伏、无俯仰、无横摇的拖曳模型进行了稳定运行试验，并引入了PD控制。在所有运动自由的情况下，还进行了自由运行测试，以确认如果适当引入控制，可以确保稳定运行。通过波浪间试验，证明了半潜船的适航性良好。通过标记使用可分离模型进行了实验，以确定由于微泡注入而减少的阻力。当速度和数量超过一定水平时，阻力减小。然而，由于模型尺寸小，注入气泡所需的功大于节省的阻力。这对实际的船来说可能并不严重。通过对高速半潜船水动力方面的研究，可以得出结论，这种类型的高速船是有前景的。进一步的研究需要更多的自由运行实验。