船艉开槽型安装船及其运动特性数值分析

摘要

As a method of installing large topsides, floatover installation is time and cost efficient and thereby has been widely used to install offshore platforms. In order to apply the technique to install topsides in the East China Sea, an installation vessel has been developed to adapt to ocean environment conditions in the East China Sea which are mainly with long-period swell. To bypass the restrictions on the motion of the installation vessel in response to the installation process, a slotted stern marine engineering installation vessel and a mooring system are proposed. Considering the combination of long-period swell and short-pe⁃riod wind-sea with wind and current, the maximum motion response of the installation vessel positioned with the mooring system is calculated, and the tension of the mooring lines is verified based on 3D potential theory and coupled time-domain analysis. The results indicate that the long-period swell mainly influences the wave frequency motions of the installation vessel, including heaving oscillation and roll and pitch. The maximum motion response of the installation vessel successfully meets the requirements of installing top⁃side, while the safety of mooring system also satisfies the standard.%浮托法作为一种成本低、耗时少的大型组块安装方法，被广泛应用于海洋平台的安装中。为将浮托法应用于东海海域平台组块的安装，需开发能适应东海长周期涌浪的海洋环境的浮托安装船。提出一种船艉开槽型海洋工程安装船，并根据安装船安装上部模块时对运动响应极值的限制，设计系泊系统。考虑东海长周期涌浪和短周期风浪以及风、流的联合作用，采用三维势流理论和非线性时域耦合分析方法，计算安装船在系泊状态下的时域运动响应极值，并分析校核系泊系统的安全性。研究结果表明，长周期涌浪主要影响安装船在系泊状态下的波频运动，包括垂荡、横摇和纵摇，安装船运动响应极值满足导管架上部模块安装施工要求，系泊系统安全性也满足要求。