Prediction of Behaviors of Floating Artificial Islands.

漂浮人工岛行为的预测。

• 批准号: 03555099
• 负责人: OHKUSU Makoto
• 金额: $ 6.85万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555099/
• 关键词: Floating Structure; Wave Forces; Drift Forces; Computer Simulation; 海上空港; 海底傾斜

Confidence to its safety and reliability for many years must be very high if we are to realize the idea of floating artificial islands. In this perspective the objectives of our research were: 1.Improvement of confidence to the prediction of extreme values of wave heights at a given location in very long return period. 2. Development of the prediction technique of wave forces on large scale floating structures located at shallow water close t o the coast. 3. Evaluation of safety of a floating structure system composed of a lot of elements including the station keeping facilities. Results of the research were: 1. We collected wave data obtained Genkai-nada area and predicted 1 00 years waves with taking into account the idea of confidence limits. The amount of data accumulated is not sufficient to have the reliable results in this area.2. (1) A theoretical method was developed for predicting wave forces on a floating structure supported by a lot of elementary floating bodies. In this me … More thod the effects of non-uniform depth of water and the existence of the coast are appropriately considered. Its theoretical basis is a perturbation and a matched asymptotic deduced from the difference between the structure's size and the size of each element composing it; the former is of th e order of kilometers comparable to the scale of non-uniform depth while to the latter's scale the sea bottom is flat. (2) A theoretical method to calculate second order wave forces, drift forces, on a structure composed of a lot of circular cylinders was given and the characteristics of these forces were understood.3. (1) A computer simulation of the behaviors in the water of long flexible structures, which would be used as elements of the stationkeeping facility of the structure, was studied and it was found that their nonlinearity have to be considered carefully when designing the safe facility. (2) We almost completed a computer program to simulate the behaviors of the artificial floating island system including various factors such as the station keeping facilities and to demonstrate their computer graphics. Less

如果我们要实现浮动人工岛的想法，对它的安全性和可靠性多年来必须有很高的信心。从这一角度出发，我们的研究目标是：1.提高对长重现期给定位置波高极值预报的置信度。2.近岸浅水大型浮式结构物波浪力预报技术的发展。3.浮式结构物系统的安全性评价包括位置保持设施在内的许多要素。研究结果如下：1.我们收集了玄海那达地区的波浪资料，并考虑到置信限的思想，预测了100年的波浪。在这方面积累的数据量不足以得到可靠的结果. (1)建立了由多个基本浮体支撑的浮式结构物所受波浪力的理论计算方法。在这个我 ...更多信息 方法适当考虑水深不均匀和海岸的存在。它的理论基础是一个摄动和一个匹配渐近推导出的结构的大小和组成它的每个元素的大小之间的差异;前者是公里的顺序可比的非均匀深度的规模，而后者的规模，海底是平坦的。(2)给出了计算多个圆柱组成的结构上的二阶波浪力即漂移力的理论方法，并了解了这些力的特点. (1)本文研究了长柔性结构物在水中的行为的计算机模拟，这些柔性结构物将用作结构物的位置保持装置的元件，发现在设计安全装置时必须仔细考虑它们的非线性。(2)我们几乎完成了一个计算机程序来模拟人工浮岛系统的行为，包括各种因素，如位置保持设施，并演示其计算机图形。少

项目成果

Makoto Ohkusu: "A study of Behaviors of a Long and Flexible Pipe in the Water" Proc. 6th International Conference Behaviors of Offshore Structures. (1993)

Makoto Ohkusu：“水中长柔性管行为的研究”Proc。