Hydroelastic Behaviors of Artificial Islands in Waves

人工岛在波浪中的水弹性行为

• 批准号: 08455479
• 负责人: OHKUSU Makoto
• 金额: $ 5.25万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455479/
• 关键词: Floating airport; Waves; Bending vibration; Numerical Analysis; 流力弾性; 境界要素法; 特異摂動法; 膜状構造物; 膜面の変形

Floating aiport is currently a unique prototype of the floating artficial island. Popular design in Japan of floating airports is very thin configuration we call a mat-type. In our research we developed a theoretiocal method to predict accurately the hydroelastic behaviors of mat-type floating airports at sea.1.We modelled the body as a sheet of membrane with small but finite magnitude of bending rigidity. This modelling is legitimate because the depth of the mat-type floating airports is very small relatively to the horizontal dimensions ; length will be several kilometers but depth will be several meters. Naturally the bending rigidity is very small and the body will be considered as a membrane rather than a rigid structure.A boundar value problem on the elevation of the water surface and the membrane was derived by implementing this assumption. We treated with the elongated form (mathematically infinitely long) of the mambrane in waves at oblique incidence angle and in deep or shallow water depth. The boundary value problem was derived and solved with considering the membrane as a quasi water surface. This idea is useful in understanding physics of the vibration of the membrane in water waves. Numerical computation becomes extremely simple and its validity is so reliable when the water depth is shallow and linear shllow water theory is applied.2.Planar configuration of the floating airports is not so simply long rectangular in reality. More numerically involved method is inevitable for predicting its behabiors and designing a real airport. A boundary integral equation method was developed for mathematically analyzing waves-elastic-body interaction of complicated configuration. A efficient scheme was devised for solving equations of extremely large number of panels on huge structure surface. This scheme was validated on our semi-analytical solution by the method developed in 1 for simpler geometry.

浮动的Aiport目前是浮动艺术岛的独特原型。日本浮动机场的流行设计是我们称为MAT-Type的非常薄的配置。在我们的研究中，我们开发了一种理论方法，可以准确预测海上MAT型浮动机场的水力弹性行为。1。我们将人体建模为一张膜片，具有较小但有限的弯曲刚度。这种建模是合法的，因为MAT型浮动机场的深度与水平尺寸相对小。长度将是几公里，但深度将为几米。自然地，弯曲刚度很小，身体将被视为膜而不是刚性结构。通过实现该假设，得出了水面和膜的边界值问题。我们用斜向的波浪和深水或浅水深度的波浪中的波浪中的马布兰伸长形式（数学上无限长）处理。通过将膜视为准水表面，得出和解决了边界值问题。这个想法有助于理解水波中膜振动的物理。数值计算变得非常简单，当水深度较浅并应用线性水理论时，其有效性是如此可靠。2。浮动机场的平面配置在现实中并不是很长的矩形。在数字上参与的方法是不可避免的，可以预测其律师和设计真正的机场。开发了一种边界积分方程方法，用于数学分析复杂构型的波弹性体相互作用。设计了一种有效的方案，用于求解巨大结构表面上大量面板的方程。该方案通过1中开发的方法在我们的半分析解决方案上验证，以简单几何。

项目成果

大楠 丹 難波 康広: "浮体式人工島の流力弾性挙動の研究" 日本造船学会論文集. (発表予定). (1998)

Tan Ohkusu 和 Yasuhiro Namba：“漂浮人工岛的水弹性行为研究”日本造船学会论文集（预定演讲）（1998 年）。

Kashiwagi M.: "A B-Spline Galerkin Scheme for Computing Wave Forces on a Floating Very Large" Proc.7th International Offshore and Polar Engineering Conference(Honolulu). 1. 229-236 (1997)

Kashiwagi M.：“用于计算漂浮超大型波浪力的 B 样条伽辽金方案”Proc.7th 国际近海和极地工程会议（檀香山）。

大楠 丹,難波 康広: "浮体式人工島の流力弾性挙動の研究" 日本造船学会論文集. (発表予定). (1998)

Tan Ohkusu、Yasuhiro Namba：“漂浮人工岛的水弹性行为研究”日本造船学会论文集（预定演讲）（1998 年）。

Ohkusu M.and Nanba Y.: "Analysis of Hydeoelastic Behavior of a Large Floating Platform of Thin Plate Configuration in Waves" Prod.International Workshop on Very Large Floating Structures. (1996)

Ohkusu M.和 Nanb​​a Y.：“波浪中薄板结构大型浮动平台的水弹性行为分析”产品。国际超大型浮动结构研讨会。

Kashiwagi M.: "AB-Spline Galerkin Method for Computing Hydroelastic Behaviour of a Very Large Structure" Proc.Int.Workshop on Very Large Floating Structure,1996. (1996)

Kashiwagi M.：“用于计算超大型结构的水弹性行为的 AB 样条伽辽金方法”Proc.Int.Workshop on Very Large Floating Structure，1996。