Research on the Estimation of Ocean Wave Spectra Based on Running Ship Motions

基于行船运动的海浪谱估计研究

• 批准号: 63550326
• 负责人: HIRAYAMA Tsugukiyo
• 金额: $ 1.54万
• 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 (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550326/
• 关键词: Ship Motion; Ocean Wave Statistics; Irregular Waves; Spectrum; Directional Spectrum; 方向スペクトル

There is no need to say that for the design and management of ship or floating bodies it is important to grasp the real state of ocean waves in quantitative manner. It is also important on the view point of preventing abnormal sea disaster. Usually instrumental measurement of ocean waves is made by ships in standing condition or moored floating bodies and it is very difficult to measure waves from running ship, so even today main source of ocean wave statistics is owed to visual observation.So,in this research we aimed to estimate directional spectrum of ocean waves in real time, introducing micro computer on board and using information on ship motions.On the first stage of this project, we conducted towing ship experiment in our towing tank which can generate directional spectrum waves and comparing those results with theoretical calculation, we examine the reliability of theoretical calculation of ship motions in directional spectrum waves.In the next, we developed a system which can estimate directional spectrum waves in real times by obtaining ship motions from sensors on board. In this system the frequency response functions of ship motions are given theoretically. Those functions are examined in the first stage and then we made numerical simulation on this system.Finally, we applied this system in real ship experiment and it was found that this system can be used practically.

无需说，对于船舶或漂浮物体的设计和管理，以定量方式掌握海浪的真实状态很重要。在防止异常海灾的角度，这也很重要。通常，船只处于站立状态或悬挂式浮动物体的情况下，对海浪进行工具测量，并且很难测量运行船的波浪，因此，即使到今天，海浪统计的主要来源也归功于视觉观察。因此，在这项研究中，我们旨在估算实时的驾驶机构的驾驶范围，以估算出船上的驾驶范围。它可以产生定向光谱波并将这些结果与理论计算进行比较，我们检查了方向光谱波中船舶运动的理论计算的可靠性。在下一个中，我们开发了一个可以通过从板上传感器获得传感器的船舶运动来估算实时估计方向光谱波的系统。在此系统中，理论上给出了船舶运动的频率响应函数。这些功能在第一阶段进行了检查，然后我们在此系统上进行了数值模拟。从实际的船舶实验中，我们应用了该系统，发现该系统实际上可以使用。