Development of a guidance system for safe navigation in rough seas

本研究工作的主要目的是研制一种在波涛汹涌的海面上安全航行的导引系统。研究工作持续了三年，取得了以下五个主要成果：结果表明，该系统将有助于船舶的安全航行。硬件组成：该系统必须监测天气状况、船舶在波浪中的运动和波浪载荷，以支持恶劣天气下的安全航行。该系统的要求是具有成本效益和耐久性。本系统通过减少传感器的数量，可以满足这些要求。系统应用程序的开发：基于两种预测技术开发了系统应用程序。第一种是船舶建造领域的随机预测技术，称为“短期预测法”；第二种是贝叶斯估计方法。此外，还引入了合适的图形化用户界面和数据存储功能作为数据库，提高了在实际操作中的实用性。可行性试验：在Shioji-maru训练舰上进行了舰载试验，并修改了系统应用程序。结果表明，在实际船舶运行中，船舶运动不能作为一个非平稳随机过程来分析。因此，不应直接采用“短期预测法”。方向性波谱估计算法的改进：基于上述原因，对估计算法进行了改进。通过引入TVVAR模型并对贝叶斯估计进行推广，证明了非定常船舶运动和时变波浪谱的分析是可行的。海上宽带系统：为商船船队管理提出了一个新概念。该实时远程监控系统是利用T.S.Shiojimaru利用通信卫星开发的海上宽带系统开发的。估计波浪谱的耗时计算可以转移到岸边。少

The main objective of this research work is development of a guidance system for safe navigation in rough seas. The research work was continued for three years and following five major results were obtained. According to the results, it can be conclude that the system developed here will contribute to safe navigation of ships.1.Making up the hardware : The weather condition, ship motions in waves and wave loads must be monitored by the system in order to support the safe navigation in rough weather. The requirements of the system are to be cost-effective and durable. The system developed here can satisfy those requirements by reducing the sensors.2.Development of system application program : The system application program was developed based on two kinds of prediction technique. The first one is the stochastic prediction technique called "short term prediction method" in the field of naval architecture and the second one is Baysian estimation method. Furthermore, introducing a suitable … More graphical user interface and a function of data storage as a data base, usefulness in the actual operation was improved.3.Feasibility tests : On board tests were carried out using the training ship Shioji-maru and the system application program was revised. According to the results, it was revealed mat the ship motions can not be analyzed as a non-stationary stochastic process in the actual ship operation. Therefore, the "short term prediction method should not be applied directly.4.Improvement of the estimation algorithm for directional wave spectra : For the reasons mentioned above, the estimation algorithm was modified. Introducing the TVVAR modeling and extending the Baysian estimation, it was shown mat non-stationary ship motions and time-varying wave spectrum can be analyzed.5.Maritime Broadband system : A new concept was proposed for merchant fleet management. The real-time remote monitoring system was developed using the Maritime Broadband system, which is a developing system of T.S.Shiojimaru using a communications satellite. Time consuming calculations for estimating wave spectra can be shifted to the shore side. Less