拖轮协助液化天然气过驳作业条件下的船舶运动响应

Dynamic Response of Liquefied Natural Gas Transfer Operation with Tug Assist

为了研究天然液化气(LNG)船对船过驳作业中拖轮对系统稳定性影响,指导过驳作业安全开展,基于三维势流理论的数值计算分析方法,利用加盖阻尼法在两船间添加驻波抑制单元以提高船舶水动力参数的计算精度,在与同类型试验结果比较验证后,进一步开展LNG船舶在海上锚泊过驳时采用不同拖轮配置方式下的船舶水动力性能以及过驳系统泊稳性能的研究。结果表明,风浪流作用于船首条件下,在受载船配置拖轮或在两船分别配置拖轮的方式可减小两船在船长方向相对运动以及艏摇运动的幅度,形成了快速预报不同配置场景下的船舶运动以及设备受力情况的方法。

In order to study the influence of the tugs on the system stability during the liquefied natural gas(LNG)ship-to-ship transfer operation,and to guide the safety of lightering operations,the numerical stimulation and analysis method of the three-dimensional potential flow theory is used,combined the lid damping method to improve the stability of the system.The calculation accuracy of the ship's hydrodynamic parameters is compared and verified with the same type of test results,and then further carry out research on the ship's hydrodynamic performance and the mooring stability of the transfer system when LNG ships are anchored at sea with different tug configurations.Under the action of wind,waves,and currents on the bow of the ship,the results show that tugs on the LNG receiving ship or two ships on the same time can reduce the relative motion of the two ships in the ship-length direction and the amplitude of the yaw motion,forming a rapid forecasting method for the ship motion and equipment stress in different configuration scenarios.