Optimal Loading System to Prevent Cargo Damage in Rough Sea Navigation from Viewpoint of Vibration Response

与公路和铁路运输相比，海上船舶运输需要在更复杂的自然条件下进行。特别是，船舶在波浪中的运动对更精确地评估安全性非常重要。虽然在造船领域已经积累了大量的研究和理论，但在实际海域中从船舶大运动损货角度进行安全评价的实例却很少。在本研究中，全新设计了总观测系统，以实现船舶运动、货物甲板加速度、车辆货物锚固力在20,000DWT级国内渡轮上的连续数据库。从这些数据库中可以揭示货物撞击与船舶运动之间的一些关系。此外，这些数据可以在2011年3月11日观测到，当时日本东北地区发生了规模空前的地震和海啸。这艘渡轮驶离离震中很近的宫城县。在观测到的垂直加速度中，可以识别出10Hz左右的显著响应。类似的现象在海上和陆地上的船只上都是肯定的。货舱甲板加速度和锚固力的关系几乎可以用船舶运动和波涛条件来解释。目前，我们正在构建船舶运动损坏货物的动态仿真算法，为海上车辆货物作业提供新的安全管理方法。

Maritime transportation with vessels is required to operate under more complicated natural conditions than road or rail transportations. Especially, ship motions in waves are very important to evaluate safety more precisely. Although many studies and theories have been accumulated in the field of naval architecture, there are few examples on the safety evaluation from viewpoint of cargo damage due to large ship motions in actual seas. In this study, the total observation system is newly designed to enable continuous database of ship motions, cargo deck accelerations, lashing forces of vehicle cargo in a 20,000DWT class domestic ferry. Some relations can be revealed between cargo impacts and ship motions from these databases. Moreover, these kinds of data can be observed in March 11, 2011, when theunprecedented size of seaquake and tsunami in Tohoku District, Japan. The ferry was off Miyagi Prefecture,which is very near from epicenter of the seaquake. The remarkable response is recognized around 10Hz in observed vertical acceleration. The similar phenomenon is assured in vessels at sea, as well as that in land. Relations of cargo deck accelerations and lashing forces can be almost explained by ship motions and wave conditions in rough seas. Now we are constructing the dynamic simulation algorithm about cargo damage due to ship motions, and it contributes to the new safety management of vehicle cargo operation at seas.