A Study on Reproduction of Ship Motions Using Coastal Waves and Judge of Operational Cancellation

Abstract

A safety of maritime transportation should be secured around harbours and open waters. However, the evaluation method about judge of ship cancellation has not been numerically modeled yet. It is inevitable to estimate ship motions during the coastal navigation. Here, the new concept of reproduction of ship motions is shown by using the coastal network wave database, NOWPHAS. A domestic ferry service, which navigates in the Pacific Ocean, is set as the object of this study. Firstly, field observations of ship motions were implemented when typhoons approached Japan in 2003-2004. Then, the reproduction accuracy is verified between two types of equations of motions. It shows that the impulse response method is inevitable to estimate large amplitudes pitch motions with detailed wave data as directional spectrums for the judge of cancellation.