深海作业平台无动力上浮过程水动力分析及运动仿真研究

Hydrodynamic analysis and motion simulation of unpowered surfacing of a deep-sea work platform

本文在-180°~0°攻角范围内,对上浮平台的流场进行了研究,结果表明大攻角下扁平体平台的分离流动及涡系非常复杂,从而造成了相应水动力的强非线性。扁平体平台垂直面内的旋转阻尼大,整个上浮过程呈现以攻角变化为主的运动特点,本文提出了在运动方程中采用“变攻角基准状态”的水动力表达方法,即位置力插值,剩余项采用传统增量模式,从而提高了上浮全过程及稳态解的预报精度。上浮运动的系列仿真揭示了抛载重量、抛载位置、初始状态对上浮全过程的影响规律。本文据此对工程上抛载提出了建议。研究结果表明,该深海作业平台无动力上浮过程具有较好的上浮安全性。

The flow fields of a surfacing platform were studied in the range from-180°to 0°of attack angle.The results show hydrodynamics has strong nonlinear characteristics due to complex separation flow and vor-tices.The rotation damping in the vertical plane is large for the studied platform because of its flat-like shape.The whole unpowered surfacing process is dominated by big change of attack angle.A new hydrody-namics expression in motion equation was proposed.The position force is obtained by interpolation directly from data-base,others remain in tradition way.That leads to more precise prediction of the surfacing.The motion simulation of the surfacing platform revealed how the unloaded weight,position and initial state affect whole process.The following suggestions were proposed for safety surfacing in engineering.The deep sea work platform in this paper has good ability of safety surfacing.