Study on Effect of Hull-flare Form for Sea-keeping Qualities

船体外展形状对适航性影响的研究

基本信息

批准号：
02452187
负责人：
TAKAKI Mikio
金额：
$ 4.29万
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：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452187/
关键词：
Hull-Flare Impulse Response 3-D Panel Method Improvement of Calculating Accuracy Neumann-Kelvin Problem Added Wave Resistance Mutual Relation to Hull form Unified Theory Hybrid法水面上部形状水面上の船型形状細長体理論(Unified Theory)耐航性能

项目摘要

We have studied on the effect of hull-flare form for sea-keeping qualities since 1990. The main conclusions obtained in this study are summarized as follows :(1) We have developed the estimating method for the hydrodynamic forces on 2-D body which include the hull flare effect. It has made clear that the effect of hull-flare on the hydrodynamic force is large.(2) The hull-flare effect on the wave loads and the added wave resistance acting on 3-D body is relatively small. The hull-flare affects on the added wave resistance. In addition to that, the present theory can estimate well the first order force. However, there are some discrepancies between theoretical results and the experimental ones concerning the second order forces such as the added wave resistance and wave pattern around a ship. Therefore, we should develop a new calculating method.(3) We have derived the validation method of the added wave resistance on the Neumann-Kelvin Problem. We have made clear from the theoretical c … More alculation and the experiment that the new terms should be added to Maruo's formula. The new terms are caused by the inconsistency in the changing rate of momentum and energy flux arising from the intersection on the surface-piercing body with forward speed.(4) We have developed the calculating method of the kernel function to improve the accuracy of the 3-D hydrodynamic forces due to the 3-D panel method. Furthermore, we have applied it to a ship to check the estimation accuracies of the hydrodynamic forces. It has become clear that a large number of panels on a ship are essential to improve its accuracy.(5) According to the comparisons between the theoretical results and experimental results on a full ship, the estimating accuracies of the first and second wave forces become worse in the short range. We should investigate the theory furthermore.(6) We have made clear the mutual relation between the ship hull forms and the sea-keeping qualities. Following this, we have gotten the instruction method improving the ship performance in waves. Less

自1990年以来，我们已经研究了船体 - 弗莱尔形式对海上保存质量的影响。本研究中获得的主要结论总结如下：（1）我们已经开发了2-D身体流体动力的估计方法，其中包括包括船体火炬效应。已经清楚地表明，船体 - 紫外线对流体动力的作用很大。（2）船体 - 罚款对波载的效应，作用于3-D身体的添加波电阻相对较小。船体 - 罚款会影响添加的波电阻。除此之外，目前的理论还可以很好地估计一阶力。但是，理论结果与实验结果之间存在一些差异，这些结果涉及二阶力，例如船舶周围的添加波电阻和波模式。因此，我们应该开发一种新的计算方法。（3）我们在Neumann-Kelvin问题上得出了添加波电阻的验证方法。我们已经从理论上明确了说明……更多的耕作和实验，应该将新术语添加到Maruo的公式中。新术语是由于动量和能量通量速率的不一致引起的，这是由向前速度的表面启动体上的相交引起的。（4）我们已经开发了核函数的计算方法，以提高由于3-D面板方法引起的3-D流体动力的准确性。此外，我们将其应用于船上以检查流体动力的估计准确性。很明显，船上的大量面板对于提高其准确性至关重要。（5）根据理论结果与完整船上的实验结果之间的比较，第一波和第二波力的估计准确性在短范围内变得更糟。（6）我们已经明确了船体形式与海上保管品质之间的相互关系。之后，我们获得了指令方法，以波浪改善了船舶性能。较少的