利用船舶运动数据估计海浪方向谱的研究

摘要

Useful information from estimation of the directional wave spectrum of sea can assist the safety of ship and the dynamic positioning control. The traditional wave spectrum estimation method uses wave buoys and other instru⁃ments, which cannot be installed on the ships nor used in working ships. This paper researches the wave directional spectrum estimation for dynamically positioning ships, which work at some fixed point. A method of estimating the current wave directional spectrum based on ship motion response data is presented, which uses multivariate AR al⁃gorithm to estimate the cross-spectrum of ship motion and uses a genetic algorithm to solve the optimal parameters of wave directional spectrum. A simulation experiment was carried out under four different sea state conditions and the results confirmed the validity of the presented method.%有效的利用海浪方向谱的信息能够为船舶安全航行和动力定位控制提供帮助，传统的海浪谱估计方法使用波浪浮标等不能随船安装的仪器，不能用于作业中的船舶。对动力定位船舶进行定点作业情况下的海浪方向谱估计进行研究，提出一种基于船舶运动响应数据估计当前海浪方向谱的方法，采用多维AR算法估计船舶运动交叉谱，采用遗传算法求解海浪方向谱的最优参数，并对4种海况情况进行了仿真实验，验证了该方法的有效性。