风浪流载荷下超大型海洋平台拆解船运动特性数值模拟

Numerical simulation of motion characteristics of a dismantling ship for super large offshore platform under wind, wave and current loads

基于Sesam软件研究风浪流耦合载荷下超大型海洋平台拆解船的运动特性,并重点探讨了举升臂及载荷方向的影响规律。首先,基于HydroD频域分析模块得到波浪载荷下拆解船运动特性;在此基础上,将频域分析得到的拆解船运动传递函数及附加质量等导入Sima时域分析模块,并同时考虑风和流载荷的影响,得到风浪流耦合载荷下拆解船运动特性。数值计算结果表明:安装举升臂后拆解船在波浪载荷下的横荡、横摇及首摇方向上运动幅值会显著增大;举升臂导致船体结构具有不对称性,风浪流载荷从压载箱侧加载时拆解船运动幅值相对较小,为保证作业安全性,应尽量保证载荷从压载箱侧加载。

Based on Sesam software,the motion characteristics of a dismantling ship of super large offshore platforms under wind,wave and current load are studied in the present work,and the influence of lifting arm and load direction are investigated.Firstly,the motion characteristics of the dismantling ship under wave load are predicted by the HydroD frequency domain analysis module.Then,the motion transfer function and additional mass of the dismantling ship obtained from the frequency domain analysis are imported into the Sima time domain analysis module,and the influence of wind and current loads is considered at the same time to obtain the motion characteristics of the dismantling ship under wind,wave and current load.The numerical results show that the motion amplitudes of the dismantling ship in the sway,roll and yaw directions under the wave load are significantly increased after the lifting arm is installed;the structure of the dismantling ship is asymmetric due to the lifting arm,and the movement amplitude of the dismantling ship is relatively small when the wind wave current load is loaded from the side of the ballast box.In order to ensure the operation safety,the load should be loaded from the side of the ballast box.