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.

已经进行了理论和实验研究，以预测波浪中非常大的浮动离岸结构（VLF）的水力弹性行为。该项目的结果总结如下：1。已经开发了一项计算机程序，以通过合并的干模式扩展技术和混合积分方程方法来预测VLF的波浪诱导的水弹性响应。2。已经进行了模型测试，以测量常规波动箱中VLFS模型的氢弹性响应。该模型由连接到切片聚乙烯块的许多铝板组成，以提供浮力。除了具有不同弯曲刚度和质量的模型外，还测试了带有垂直壁或水平淹没板的VLFS模型，以研究减少VLFS边缘附近的大偏转区域的可能性。 （a）VLFS模型的运动响应以高阶弹性模式为特征。随着波浪频率的增加，响应幅度会大大减少，除了在观察到大偏转的波边缘附近。随着波浪频率的增加，其效果更为明显。当VLF的长度超过波长的五倍时，将响应降低至约2/3至1/2，并将其连接到与草稿相当的边缘板。（c）在理论和实验预测之间观察到令人满意的一致性，从而确认了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）

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。

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。

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。

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。