【摘要】 为研究液舱建模方式对半潜式平台总体强度评估的影响,分别采用质量点模型、液舱模型(准静态法)以及考虑液舱内部水动力效应的液舱模型(全动态法)进行了平台水动力预报及结构响应计算,并比较了不同液舱建模方式下平台的典型波浪载荷、设计波参数以及结构应力分布。3种液舱建模方法中,质量点模型将液舱重量等效为质量点,均匀施加在液舱舱壁上,忽略了水动压力的影响,而液舱模型则比较合理地模拟了液舱内部液体的分布情况。计算结果表明,质量点模型和液舱模型的总体应力分布基本保持一致,液舱局部应力略有差异,总体来讲液舱内部水动力效应的影响较小。如果液舱位于平台的关键连接部位时,最好建立液舱模型进行分析,这样更能反映真实情况。更多还原

【Abstract】 In order to study the influence of liquid tank modeling method on the overall strength assessment of semi-submersible platform, the mass point model, the liquid tank model(quasi-static method) and the liquid tank model considering the hydrodynamic effect inside the tank(full dynamic method) were used respectively to carry out the hydrodynamic prediction and structural response calculation of the platform, and the typical wave loads, design wave parameters and structural stress distribution of the platform were compared under different liquid tank modeling modes. Among those three liquid tank modeling methods, the mass point model equalizes the tank weight as the equivalent mass point and uniformly applies it onto the tank bulkhead, ignoring the influence of hydrodynamic pressure, while the tank model simulates the distribution of liquid inside the tank more reasonably. The calculation results show that the overall stress distributions of the mass point model and the liquid tank model are basically the same, and the local stress of the tank is slightly different. Generally speaking, the hydrodynamic effect of the liquid inside the tank is insignificant. However, if the liquid tank is located at the critical junction of the platform, it is suggested to establish a liquid tank model for analysis and better reflecting the real situation.更多还原