A prediction method, based on the Morison equation as well as Froude-Krylov formula, is presented to simulate the loads acting on the columns and caissons of the semi-submersible platform induced by Internal Solitary Wave (ISW) respectively. Combined with the experimental results, empirical formulas of the drag and inertia coefficients in Morison equation can be determined as a function of the Keulegan–Carpenter (KC) number, Reynolds number (Re) and upper layer depth $h_1/h$ respectively. The experimental and calculated results are compared. And a good agreement is observed, which proves that the present prediction method can be used for analyzing the ISW-forces on the semi-submersible platform. Moreover, the results also demonstrate the layer thickness ratio has a significant effect upon the maximum horizontal forces on the columns and caissons, but both minimum horizontal and vertical forces are scarcely affected. In addition, the incoming wave directions may also contribute greatly to the values of horizontal forces exerted on the caissons, which can be ignored in the vertical force analysis.

提出了一种基于Morison方程和Froude-Krylov公式的预测方法，分别模拟了由内孤立波（ISW）引起的作用在半潜平台柱和沉箱上的载荷。结合实验结果，可以确定 Morison 方程中阻力系数和惯性系数的经验公式为 Keulegan-Carpenter (KC) 数、雷诺数 (Re) 和上层深度的函数$H_1/H$分别。比较实验和计算结果。并且观察到了很好的一致性，这证明本预测方法可以用于分析半潜平台上的ISW力。此外，结果还表明，层厚比对柱和沉箱上的最大水平力有显着影响，但对最小水平力和垂直力几乎没有影响。此外，传入的波浪方向也可能对施加在沉箱上的水平力的值有很大影响，这在垂直力分析中可以忽略。