破损舰船运动与波浪载荷预报方法

为了研究舰船舱室破损对船体运动与波浪载荷的影响,采用三维频域势流理论,计算了发生第二类舱室破损后舰船在斜浪规则波上的运动与垂向弯矩。以一典型破损情况为例,计算了船舶破损后的浮态及稳性,并与破损前进行了比较,结果显示,横摇运动及垂向弯矩明显增加,而其它5个自由度运动则有所减小。基于船舶静力学原理,分析了舰船破损对浮态及稳性的影响。最后,使用格林函数法研究了舱室进水导致的液舱晃荡,结果表明,液舱晃荡附加质量在某些频率附近有明显的共振效应,必须通过阻尼系数考虑流体粘性的影响,避免产生非物理结果。

Prediction Method of Damaged Ships Motion and Wave Loading

In order to study the influence of damaged compartment on ship motion and wave loading, the three dimensional frequency domain potential flow theory was introduced, and the motion response and vertical bending moment of the ships were calculated on condition of the second type damaged in oblique wave. Taking a typical damaged condition as example, floating condition and stability with the post-dam- aged condition were calculated, and the results were compared with the pre-damaged condition. The re- sults show that the roll motion and the vertical bending moment obviously increase, while other 5-DOF mo- tions decrease. Based on the theory of ship hydrostatics, the influence of damaged warships on floating con- dition and stability was analyzed. At last, the liquid tank sloshing which caused by ships damage were re- searched by using the Green Function Method. The conclusions are drawn that added mass have obviously resonance effect in some frequency range, the effects of fluid viscosity have to be considered via damping coefficient to avoid the non-physical results.