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有关的三个项目。（1）通过边界元素方法，（2）稳定跑步和运动控制的模型实验以及（3）通过微气泡注入降低摩擦电阻的模型实验。提到以下结论和发现。1。引入了一些新方法，用于治疗自由表面，下游和kutta条件，并证明该方法有效。模拟了半掩盖的高速船的几种情况，以发现有关淹没举起表面与自由表面流之间相互作用的有趣现象。2。通过使用牵引模型进行牵引，俯仰和滚动运动是免费的，并引入了PD控制，可以确认稳定跑步的实验。还进行了免费的运行测试，其中所有动作都是免费的，以确认如果正确引入控件，则可以确保稳定的运行。通过在海浪中的实验中，证明了半熟食船的海洋价值。3。通过标记可分离模型来确定由于微泡注射引起的电阻的降低而进行实验。当速度和数量高于一定水平时，电阻会降低。但是，由于模型的尺寸较小，要注入气泡的所需工作大于保存的电阻。对于实际的船只而言，这可能不是严重的。通过目前关于高速半熟练船体流体动力方面的研究，可以得出结论，这种高速船是预期的。对于进一步的研究，需要进行更多关于自由跑步的实验。