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

• 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

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

我们从1990年开始就船体外展形状对适航性的影响进行了研究。本研究得到的主要结论概括如下：(1)建立了包含船体外展效应的二维体水动力估计方法。表明船体外展对水动力的影响较大。(2)船体外展对波浪载荷和作用在三维体上的附加波浪阻力的影响相对较小。船体耀斑会影响附加的波浪阻力。除此之外，本理论可以很好地估计一阶力。然而，对于船舶附加波浪阻力和波型等二阶力，理论结果与实验结果存在一定的差异。因此，我们应该开发一种新的计算方法。(3)推导了Neumann-Kelvin问题的附加波浪阻力的验证方法。我们从理论计算和实验中明确了丸尾公式中应添加新项。这些新项是由于表面刺穿体与前进速度相交时产生的动量和能量通量的变化率不一致而引起的。(4)我们开发了核函数的计算方法，以提高3-D面板方法的3-D水动力的精度。此外，我们已将其应用于船舶以检查水动力的估计精度。显而易见，船舶上的大量面板对于提高其精度至关重要。(5)根据理论结果和整船实验结果的比较，第一波和第二波力的估算精度在短距离内变差。对此理论还需进一步研究。(6)明确了船体型式与耐波性能之间的相互关系。由此，我们得到了提高船舶波浪性能的指导方法。较少的

项目成果

Hidetsugu Iwashita: "Evaluation of the Added-Wave-Resistance Green Function Distribution on a Panel." Memoirs of the Faculty of Engineering Hiroshima University. 11, No. 2. (1992)

Hidetsugu Iwashita：“评估面板上的附加波阻格林函数分布。”

許 平,高木 幹雄: "大振幅動揺中の二次元浮体に働く非線形流体力" 西部造船会々報. 81. (1991)

Ping Xu，Mikio Takagi：“大振幅振荡期间作用于二维浮体的非线性流体力”，西方造船工程师学会公报 81。（1991）。

Hidetsugu Iwashita, et al.: "Wave Forces Acting on a Blunt Ship with Forward Speed in Oblique Sea." J. Soc. N. A. Japan. 171. (1992)

Hidetsugu Iwashita 等人：“波浪力作用于斜海中向前速度的钝船”。

肥後 靖,河 文根: "前進速度を有する物体の動揺問題における線積分に関する一考察" 関西造船協会誌. 215. (1991)

Yasushi Higo，Fumine Kawa：“物体向前速度运动问题中的线积分研究”关西造船协会杂志 215。（1991）

高木 幹雄,許 平,津村 信一: "自由動揺に対する水線面形状の影響とメモリ-影響関数" 西部造船会々報. 第80号. 117-130 (1990)

Mikio Takagi、Hei Hiroshi 和 Shinichi Tsumura：“水线形状对自由运动和记忆影响功能的影响”西方造船协会通报第 80 号。117-130 (1990)。