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Extraordinary Dynamic Responses of Huge Floating Offshore Structures in Directional Spectrum Waves

巨大漂浮海上结构在定向谱波中的非凡动力响应

基本信息

批准号：
01420032
负责人：
TAKEZAWA Seiji
金额：
$ 20.86万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01420032/
关键词：
Floating Huge Offshore Structures Directional Spectrum Waves Dynamic Response in Wave Responses in Directional Spectrum Waves Extraordinary or Extreme Response Elastic Response of Structures 方向スベクトル波

项目摘要

On huge floating offshore structures mooring in deep seas, experimental researches in irregular waves using semi-elastic models were carried out at the towing tank of Yokohama National University.A very long model was moored by the one point mooring buoy of a tension type and directional spectrum waves simulating satisfactorily real ocean waves were also used. Such experiments have not been carried out in the world. Obtained results of this study are as follows.1. It is certified that newly developed one point mooring buoy using 4 tensioned wires has enough performances for usage in deep and rough seas.2. Furthermore, motions of the huge floating offshore structure moored by this buoy system are very small and satisfy completely the demands for use of artificial floating islands etc.3. On the other hand, there is a notable tendency that the longitudinal rigidity of the huge floating offshore structures is small compared with that of the huge ships. Although the motions as a rigid body … More are negligible small as above mentioned, the elastic responses in waves appear remarkably. Especially when the natural frequency of elastic structure exist in the frequency order of wave spectra, resonance phenomena are occurred and those elastic responses become extraordinary high value to compared with wave exciting forces as input.4. Several vibration modes are induced simultaneously and there are phase differences. Therefore elastic response characteristics are quite different due to the position in the structure.From the obtained results, it become clear that the huge floating offshore structure is valuable for the artificial floating islands to many purposes, even if those are settled at the rough deep ocean. And this study shows a practical example of the very long floating island moored by one point tension buoy system. Moreover the results of this investigation newly indicate that the elastic structural response of the huge floating island is one of the important investigation item in the initial design stage. And some practical useful data for design of such huge offshore structure are also shown in this research. Less

在横滨国立大学的拖曳水池中，采用张力型单点系泊浮筒系泊超长模型，模拟真实的海浪，对大型海洋浮式结构物进行了不规则波半弹性模型试验研究。世界上还没有进行过这样的实验。本研究取得的主要结果如下：1.证明了新研制的4根张紧绳单点系泊浮筒具有足够的深水、大风浪性能.此外，该浮标系泊的大型海洋浮式结构物的运动非常小，完全满足人工浮岛等的使用要求。另一方面，大型海洋浮式结构物的纵向刚度与大型船舶相比有明显的偏小趋势。虽然刚体的运动 ...更多信息由于上述因素的影响可以忽略不计，因此波浪中的弹性响应显著地出现。特别是当弹性结构的固有频率处于波浪谱的频率级时，与输入的波浪激振力相比，会发生共振现象，弹性响应值会变得非常高.多个振动模式同时被诱导，并且存在相位差。结果表明，大型海洋浮式结构物对于人工浮岛具有很好的应用价值，即使是在波涛汹涌的深海中也是如此。并给出了一个单点张力浮标系泊超长浮岛的应用实例。研究结果表明，大型浮岛的弹性结构响应是初步设计阶段的重要研究项目之一。同时也为此类大型海洋结构物的设计提供了一些实用的数据。少