Reconstruction of Wave Field around Taiwan Sea Area using Ship Motions of a Fleet

• Main Authors: Cheng-Han Tsai, 蔡承翰
• Other Authors: Forng-Chen Chiu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/57911549554759728011

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 97 === In recent years, artificial neural network (ANN) has been applied on the field of ocean engineering and naval architecture. Most of these researches are used to do prediction in time domain, and the accuracy is acceptable for engineering applications. In the present study, the pattern recognition ability of ANN is applied to develop a model for evaluating wave characteristics basing on ship motions. In addition, ANN is also applied to reconstruct the spatial distribution of wave field around Taiwan sea area by using limited numbers of sampling wave data. In the present study, maybe 50~70 ships of the fleet of Taiwan Coast Guard are considered as the mobile agents of a sensor network for capturing the wave field around Taiwan sea area. By sensing the motion responses of each ship at the same time and putting them into ANN model, the significant wave height、wave period、incident angle and ship speed at the location of each ship can be evaluated. Then puting these scattered wave data (about 50~70 sets) into another ANN model, the spatial distribution of wave field around Taiwan sea area can be reconstructed. In this study, SWAN data of the TaiCOMS are applied for simulating the proposed ship-bone wave monitoring system and verifying the accuracy and feasibility of this system. MATLAB is used to develop the software to simulate the ship motions in short crested irregular waves, and Neural Solution is applied to develop the ANN models. ANN models have a good performance on evaluating wave characteristics basing on ship motions and reconstructing the spatial distribution of wave field around Taiwan sea area by using limited numbers of sampling wave data. The result of this research shows that the present ship-bone wave monitoring system is feasible with acceptable accuracy for engineering use.