【摘要】 全冷式超大型液化气船(Very Large Gas Carrier,VLGC)的运动及波浪载荷预报对船体、围护系统和液舱支座的结构安全性评估至关重要。对此,以83 000 m3VLGC为例,采用WALCS程序系统作为主要分析工具,应用三维线性势流理论,在频域内预报该VLGC船体运动与波浪载荷的传递函数和长期预报极值。以第二液货舱重心处的加速度和舯剖面的垂向波浪弯矩为研究对象,比较分析WALCS预报值与IGC设计值、UR-S11规范值及SESAM预报值的差异。分析结果可为VLGC的结构安全性评估提供载荷输入和参考。更多还原

【Abstract】 Ship motion and wave load prediction of Very Large Gas Carrier( VLGC) is essential for the safety assessment of hull structure,containment system and tank support. An 83 000 m3 VLGC is taken as the object of study for illustration.The hydrodynamic analysis software WALCS based on three dimensional linear potential flow theory is used as the primary analytical tool to predict the hydrodynamic characteristics of ship motion and wave load in frequency domain. The gravity acceleration of second cargo tank and the vertical wave bending moment of midship section are calculated. The WALCS forecast values are compared with those from IGC rule,UR- S11 standard and SESAM. The calculated results can be a reference of the excitation input for the structural safety assessment of VLGC.更多还原