摘要
应用基于Longuet-Higgins波浪模型的双波列叠加改进模型进行畸形波的数值模拟。使用SESAM软件对波浪传递函数和半潜式平台水动力参数进行计算。通过频域-时域变换,在时域下求解平台的运动方程和系泊缆的动平衡方程,得到平台运动响应和系泊缆张力。同时研究了波浪方向和聚焦位置的变化对平台运动响应和系泊缆张力的影响规律。研究发现,平台响应和系泊缆张力受畸形波的聚焦位置影响显著。横摇、纵摇响应和系泊缆受力随浪向角的改变成规律性变化,垂荡运动则对浪向角的改变不敏感。
Advanced double wave train superposition model, which is based on Longuet- Higgins model, is applied to the numerical simulation of freak wave. Wave force transfer function and hydrodynamic parameters of a semi-submersible platform were calculated by SESAM. Under transformation from frequency domain to time domain, motion response of platform and tension of mooring ropes were obtained by solving the kinematic equation of platform and dynamic balance equation of mooring ropes in time domain. Simultaneously, the influence due to the changes of the wave direction and focus position was calculated and discussed respectively. The study finds that focus position of freak wave has a significant influence on response of platform and tension of mooring ropes. Rolling motions, pitch motions and tension of mooring ropes show regular changes with the increasing of wave direction. But heave motions of platform are insensitive to wave direction.
关键词
半潜式平台
畸形波
时域分析
Semi-submersible platform
Freak wave
Time-domain analysis
