中文说明：
对于船舶及海洋平台等海洋浮式结构物，在其水动力试验过程中针对其横摇、纵摇运动数据进行分析，计算得出其固有运动周期及阻尼系数，进一步使用用FDTD计算三维周期结构。
English Description：
For floating structures such as ships and offshore platforms, the rolling and pitching motion data are analyzed during the hydrodynamic test, and the natural motion period and damping coefficient are calculated. Then FDTD is used to calculate the three-dimensional periodic structure