The stability of floating platforms is closely related to the sea states, fairlead positions, and center of mass (CM) of the platform. To investigate the influences of these interference factors, numerical modeling of a spar platform with four mooring cables is performed using an in-house MATLAB code. To analyze the influences of the nonlinear hydrodynamic forces of cables, cable dynamics are considered using the lumped mass method with respect to a relative-velocity-element frame. The relation between the motions of the spar and the propagating waves is revealed in both the time and frequency domains. Additionally, the contribution of the hydrodynamic forces to the oscillating amplitude of the mooring forces is approximately 20% in the X- and Y-directions, and 40% in the Z-direction. The hydrodynamic forces also generate hysteresis between the peak displacements and the peak forces. Finally, the influences of the CM and fairleads are studied using four and five virtual maneuvers, respectively. The analysis results indicate that both the CM and fairleads have a slight influence on the translational motions, whereas they have a significant influence on the rotational motions. The optimal positions for setting the CM and fairleads are found with respect to the spar frame.

浮动平台的稳定性与平台的海况、导缆器位置和质心（CM）密切相关。为了研究这些干扰因素的影响，使用内部 MATLAB 代码对具有四根系泊缆绳的梁平台进行了数值建模。为了分析电缆非线性水动力的影响，使用相对速度单元框架的集中质量方法来考虑电缆动力学。在时域和频域中都揭示了翼梁运动与传播波之间的关系。此外，水动力对系泊力振荡幅度的贡献在 X 和 Y 方向约为 20%，在 Z 方向约为 40%。流体动力还在峰值位移和峰值力之间产生滞后。最后，分别使用四个和五个虚拟操作来研究 CM 和导缆器的影响。分析结果表明，CM 和导缆器都对平移运动有轻微影响，而对旋转运动有显着影响。设置 CM 和导缆器的最佳位置是相对于梁框架找到的。