系泊浮体在浅水波浪中运动响应的计算研究

Research on the Motion Response of Mooring Body in Shallow Water

对于船舶在浅水中的运动和锚泊系统响应问题,使用时域方法计算一艘起重铺管船在浅水无航速系泊状态下在波浪中的运动响应。基于三维频域势流理论,应用SESAM软件计算浮体在规则波中的频域水动力参数及运动响应。通过频域到时域的转换方法,得到浮体在时域中的水动力系数和不规则波的一阶与二阶波浪力。在时域内计算锚链拉力,再耦合数值求解浮体时域运动方程,得到其在不规则波中的运动时历。最后,采用本方法计算铺管驳船在多点系泊状态下,在浅水波浪中的6个自由度的运动响应和锚缆张力,并将计算结果与模型试验进行比较。分析表明本方法能够提供具有工程精度的船舶运动性能预报。

To research the motion and mooring system response of pipe-lay barge in shallow water,a time-domain numerical method was used to solve the motion and mooring system response of mooring float body without forward speed in shallow water.Based on 3-D frequency potential theory,the hydrodynamic co-efficient and motion response of float body in frequency-domain were calculated using the SESAM program and transferred into time-domain.The response of motion and tension of mooring cable was calculated in time-domain.The time-domain motion equation of float body was solved using numerical method coupling the float body and the mooring system.By using this method,the motion and mooring system response of a pipe-laying barge was calculated and compared with the experiment result.Results proved that on the numerical results has enough accuracy for engineering application.