远洋救助船横摇运动响应极值预报研究

Study on Extreme Value Prediction of Rolling Motion Response of Ocean Rescue Ship

本文采用AQWA软件对远洋救助船的母型船进行耐波性计算,利用Gumbel方法对危险海况下船舶以设计航速航行时的横摇运动响应进行极值预报.基于势流理论进行频域计算,得到船舶六自由度运动响应幅值算子(RAO),确定设计航速下的危险浪向.通过时域方法模拟船舶横摇运动,得到船舶在危险浪向下的横摇运动响应时程.采用Gumbel方法对横摇运动响应进行极值预报,评估不同海况下船舶的航行安全性.结果表明:本文提出的预报方法具有较高的精度.

The seakeeping of the mother ship of the ocean rescue ship was calculated by AQWA software,and the rolling motion response of the ship sailing at the design speed in dangerous sea conditions was predicted by Gumbel method.Based on the potential flow theory,the frequency domain calculation was carried out,and the amplitude operator(RAO)of the ship’s six-degree-of-freedom motion 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.