Wave-free floating-body forms in shallow water and application to a very large floating structure

浅水中无波浪浮体形式及其在超大型浮式结构中的应用

• 批准号: 06651085
• 负责人: KYOZUKA Yusaku
• 金额: $ 0.58万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06651085/
• 关键词: Wave-Free Body; Wave-Free Singularity; Wave Free; Wave Diffraction; Shallow Water; Boundary Element Method; 波無し浮体形状; 半潜水式海洋構造物; 波浪強制力; 浅海域; 浮体; 波特異点

Some wave-free floating-body forms in heaving oscillation are obtained by using a wave-free singularity of source and vertical dipole combination to generate bulbous-shaped two-and three-dimentional bodies in shallow water. Body forms are obtained by the streamline tracing method at a planned wave frequency, where the body boundary condition of heaving oscillation is satisfied.Effects of location of the wave-free singularity and water depth on the body-form are studied. Body forms become slender as water depth becomes shallow. Wave exciting forces of obtained bodies are calculated by the singularity distribution method in two-and three-dimentions to verify that they become wave-free at the planned wave-number.Model experiments were conducted in 2D and 3D wave tanks. Wave exciting forces of obtained wave-free bodies were measured in regular waves. Wave-free frequency estimated by amplitude reaponse function of heaving excitation is almost same as the theory but a little bit higher, which may be attributed to nonlinear effects such as viscosity of water. Finally, some proposal are made to apply such a wave-free body to a very large floating structure (VLFS) of semi-submersible type.

利用源的无波奇异性和垂直偶极子的组合，在浅水中产生球根形二维和三维物体，得到了无波浮体在升沉振荡中的几种形式。采用流线追踪法，在满足波浪升沉振荡边界条件的情况下，在给定的波浪频率下得到了船体的外形，并研究了无波奇点位置和水深对船体外形的影响。随着水深变浅，体型变得细长。采用奇异性分布法计算了二维和三维模型的波浪激振力，验证了模型在设计波数下的无波性，并在二维和三维波浪水槽中进行了模型试验。在规则波中测量了所获得的无波体的波浪激振力。由垂荡激励的振幅响应函数估算的无波频率与理论值基本一致，但略偏高，这可能是由于水的粘性等非线性效应的影响。最后，提出了将这种无波体应用于超大型半潜式浮式结构物（VLFS）的建议。

项目成果

N.Nariai and Y.Kyozuka :"Wave-Force Body Forms in Shallow Water" Proc.Conference of West Japan Soc.of Civil Engineering. 358-359 (1996)

N.Nariai 和 Y.Kyozuka：“浅水中的波浪力体形式”西日本土木工程学会会议论文集。

成合功光: "浅海域の波無し浮体形状と波浪応答" 土木学会西部支部研究発表会講演概要集. 358-359 (1996)

成功之光：“浅水中的无波浮体形状和波浪响应”日本土木工程师学会西部分会的演讲摘要 358-359 (1996)。

成合功光、経塚雄策: "浅海域の波無し浮体形状と波浪応答" 平成7年度土木学会西部支部研究発表会梗概集. (発表予定). (1996)

Hikaru Seiga、Yusaku Kyozuka：“浅水中的无波浮动结构形状和波浪响应”1995 年日本土木工程师学会西部分会研究报告摘要（待提交）。