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

如果我们要意识到我们研究的目标是：1。在很长的回报期内，在给定位置的波浪高度预测时，置信度必须是：1。对波高度的预测o海岸。 2。与非均匀深度的尺度相媲美的阶数是扁平的。研究了柔性的结构，发现他们的非线性必须仔细设计，以设计其安全设施，例如驻车设备

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。