基于瞬态高斯波包的船舶耐波性模型试验研究  

Study on Sea-keeping Model Test Based on Transient Gaussian Wave Packets

作　　者：刘震 范佘明[1] 王海波[1] 陈禧 LIU Zhen;FAN Sheming;WANG Haibo;CHEN Xi(Shanghai Key Laboratory of Ship Engineering,Marine Design and Research Institute of China,Shanghai 200011,China)

机构地区：[1]中国船舶及海洋工程设计研究院,上海市船舶工程重点实验室,上海200011

出　　处：《中国造船》2020年第2期43-51,共9页Shipbuilding of China

基　　金：工信部高技术船舶科研项目。

摘　　要：基于瞬态波(聚焦波)包的船舶耐波性模型试验耗时很短,可以显著提高试验效率。首先在大型拖曳水池模拟满足高斯波谱的不同聚焦波幅的瞬态波包,然后针对一艘钻井船,考虑其迎浪、首斜浪以及横浪状态,在瞬态高斯波包作用下进行耐波性模型试验。研究发现:试验模拟的瞬态高斯波包具有较好的波形和谱形特征;用聚焦波幅适当的瞬态高斯波包获得的钻井船垂荡、纵摇运动及垂荡加速度RAO(response amplitude operator)与规则波及白噪声不规则波的试验结果吻合较好,而且能有效地捕捉RAO曲线的峰值。为了获得合理的RAO,聚焦波幅不宜过大,谱峰周期需与相应的摇荡运动的固有周期相当。这项研究对提高船舶耐波性模型试验的效率具有重要意义。In sea-keeping model test of ships,regular waves and white-noise irregular waves are frequently utilized to obtain response amplitude operators(RAOs)of the motion and acceleration of these ships.A series of experiments by means of regular waves needs long time duration(approximately 60 min)and it is difficult to capture the peak value of the RAO.Model test using white-noise irregular waves has a relatively short duration(10~30 min),but reflection of tank walls may affect test results.The experiment based on transient waves(focused waves)holds a quite less time duration(1~2 min)and thus significantly improve the testing efficiency.In this study,transient wave packets satisfying the Gaussian spectrum were generated in a large towing tank to conduct sea-keeping model tests of a drilling ship under the condition of head wave,oblique wave,and beam wave respectively.It is shown that the measured transient Gaussian wave packet holds better wave profile.It is demonstrated that RAOs of the heave and pitch motions as well as the heave acceleration by the transient Gaussian wave packet with a suitable focused amplitude are in good agreement with those obtained by regular waves and white-noise irregular waves,and can effectively capture the peak of the RAOs.In order to obtain rational RAOs,the specified focused amplitude should not be too large and the period of the peak in the Gaussian wave spectrum should be close to natural periods of the corresponding motions of the ship.This study is of significance for improving efficiency of ships in waves.

关 键 词：瞬态波 高斯波包 响应幅值算子(RAO) 耐波性模型试验 

分 类 号：U661.32[交通运输工程—船舶及航道工程]