On Hydroelastic Behavior of Very Large Floating Structures for Ocean Space Utilization

海洋空间利用超大型漂浮结构的水弹性行为研究

• 批准号: 09450205
• 负责人: MATSUI Tetsuya
• 金额: $ 6.72万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450205/
• 关键词: floating offshore structure; wave; fluid force; motion response; elastic response; integral equation method; 流れ

Theoretical and experimental studies have been performed to predict the hydroelastic behavior of a very large floating offshore structures (VLFS) in waves. The results of the project are summarized as follows :1. A computer program has been developed to predict the wave-induced hydroelastic response of a VLFS by combined use of a dry-mode expansion technique and the hybrid integral-equation method.2. Model tests have been conducted to measure the hydroelastic response of a VLFS model in a regular wave tank. The model is composed of a number of aluminum plates attached to a slitted polyethylene block to provide buoyancy. In addition to the models with different bending stiffnesses and masses, a VLFS model with a vertical wall or a horizontal submerged plates at the wave-front edge were tested to investigate the possibility of reducing the large deflection near the edge zone of the VLFS. The following conclusions were derived from the series of tests.(a) The motion response of the VLFS model is characterized by the higher-order elastic modes. With increasing the wave frequency, the response amplitudes are reduced drastically except near the wave-front edge where the large deflection is observed.(b) Attaching the vertical wall or the horizontal submerged plates at the wave-front edge has the effect of reducing the large deflection at the edge zone. Its effect is more pronounced with increasing the wave frequency. When the length of the VLFS exceeds five times the wave length, the response is reduced to about 2/3 to 1/2 with attaching the edge plates whose length is comparable with the draft.(c) Satisfactory agreement is observed between theoretical and experimental predictions, confirming the validity of the proposed analytical method.

对超大型浮式海洋结构物在波浪中的水弹性行为进行了理论和试验研究。本课题的主要研究成果如下：1.将干模态展开技术和混合积分方程法相结合，编制了超大型浮体波浪诱导水弹性响应的计算程序.在规则波水槽中进行了VLFS模型水弹性响应的模型试验。该模型是由一些铝板连接到一个狭缝聚乙烯块，以提供浮力。除了具有不同的弯曲刚度和质量的模型，VLFS模型的垂直壁和水平淹没板在波的前端边缘进行了测试，以探讨减少VLFS的边缘区附近的大挠度的可能性。从一系列试验中得出以下结论。(a)VLFS模型的运动响应由高阶弹性模态表征。随着波频的增加，响应幅值急剧减小，但在波前缘附近出现较大的挠度。(b)在波前边缘附加垂直壁或水平潜板，可以减小边缘区的大挠度。其效果随着波频率的增加而更加明显。当VLFS的长度超过5倍波长时，通过附加长度与吃水相当的边缘板，响应减小到约2/3至1/2。(c)令人满意的协议之间观察到的理论和实验预测，确认所提出的分析方法的有效性。

项目成果

金徳印ほか: "TLP係留索の疲労損傷への2次波浪外力の寄与について-レインフロー法による時間領域解析-"日本建築学会東海支部研究報告集. 第38号. 293-296 (2000)

Kim Tokuin 等：“二次波外力对 TLP 系泊缆疲劳损伤的贡献 - 使用雨流法的时域分析”日本建筑学会东海分院研究报告第 38. 293-296 号（2000 年）

Matsui, T. et al.: "Wave Forces on Large Axisymmetric Floating Bodies in Weak Current"Proc. 16th Int. Conf. on Offshore and Arctic Engng., Yokohama. Vol. I-A. 39-46 (1999)

Matsui, T. 等人：“弱电流中大型轴对称浮体上的波浪力”Proc。

Moribe, Y. et al.: "An Experimental Study on Wave Response of a Large Floating Plate-Type Structure, Part 1 : Comparison with Analytical Prediction"Summaries of Technical Papers of Annual Meeting, AIJ. Vol.A-2. 349-350 (1999)

Moribe, Y. 等人：“大型浮板型结构的波浪响应实验研究，第 1 部分：与分析预测的比较”年会技术论文摘要，AIJ。

Kato, K.et al.: "Comparative Study on the Motion Characteristics of Different Types of Floating Offshore Structures" Proc.16th Int.Conf.on Offshore Mechanics and Arctic Engineering, Yokohama. Vol.I-A. 195-202 (1997)

Kato, K.等人：“不同类型浮动海上结构运动特性的比较研究”Proc.16th Int.Conf.on Offshore Mechanics and Arctic Engineering，横滨。

Matsui, T. et al.: "Wave Forces on Large Axisymmetric Floating Bodies in Weak Current"Proc. 16th Int. Conf. on Offshore Mechanics and Arctic Engineering, Yokohama. Vol.I-A. 39-46 (1997)

Matsui, T. 等人：“弱电流中大型轴对称浮体上的波浪力”Proc。