Abstract

In this study, from the viewpoint of ship safety, a stability judgment system based on Time Series Analysis is proposed in order to protect large amplitude rolling in rough seas. The examination of the system is carried out using model experimental data obtained with a free-running test involving a container ship. In this system, the data is analyzed with a self-organizing state space modeling procedure, and ship motion parameters that characterize the ship motion are identified at every moment. Moreover, a safety index is defined by using the identified parameters, and the stability of the ship is determined. It is confirmed that the proposed system is a powerful tool for determining the stability of the ship. Some future problems with respect to the online identification are also considered.

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