Study on Extreme Value Prediction of Rolling Motion Response of Ocean Rescue Ship
The seakeeping of the mother ship of the ocean rescue ship was calculated by AQWA soft-ware,and the rolling motion response of the ship sailing at the design speed in dangerous sea condi-tions was predicted by Gumbel method.Based on the potential flow theory,the frequency domain cal-culation was carried out,and the amplitude operator(RAO)of the ship's six-degree-of-freedom mo-tion response was obtained to determine the dangerous wave direction at the design speed.The ship rolling motion was simulated by time domain method,and the response time history of ship rolling motion under dangerous waves was obtained.Gumbel method was used to predict the extreme value of rolling motion response and evaluate the navigation safety of ships under different sea conditions.The results show that the prediction method proposed in this paper has high accuracy.
ocean going rescue vesselseakeepingextreme value predictionroll motion
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