This study considers the evaluation of ship operational performance in real sea states using a time-domain approach. The current seakeeping-maneuvering coupling approach consists of two modules. First, in the seakeeping module, the time-domain three-dimensional Rankine panel method is applied to compute wave-induced forces and resultant ship motion. To validate this module, the computational results for wave drift force are compared with the existing experimental data for various forward speeds and regular wave conditions. Second, in the maneuvering module, the equations of motion with 4 degrees of freedom that are based on the Maneuvering Modeling Group are solved to simulate the ship navigation. The computed seakeeping and maneuvering values are immediately transferred between the two modules in the time domain, and so they are directly integrated. By applying this coupling method, a free-running simulation for a ship navigating along a given route is performed. The trajectory tracking method based on a proportional–derivative-based rudder control is adopted for straight course-keeping. Not only the speed loss but also the attitude for route maintenance is evaluated for various environmental load conditions. The simulation results are validated by a comparison with those of the existing free-running model test. Based on comparisons, environmental load effects and resultant quantities on operational performance are discussed.

这项研究考虑了使用时域方法评估真实海况下船舶的运行性能。当前的海上航行机动耦合方法包括两个模块。首先，在航海模块中，时域三维兰金面板法被用于计算波浪感应力和由此产生的船舶运动。为了验证该模块，将波浪漂移力的计算结果与现有的各种前进速度和规则波浪条件下的实验数据进行了比较。其次，在操纵模块中，求解基于操纵建模组的4个自由度的运动方程，以模拟船舶航行。计算出的航海值和操纵值在时域中立即在两个模块之间传输，因此它们直接集成在一起。通过应用这种耦合方法，可以对沿着给定路线航行的船舶进行自由运行仿真。直线航向采用基于比例微分舵控制的轨迹跟踪方法。在各种环境负荷条件下，不仅评估速度损失，而且评估路线维护的态度。通过与现有自由运行模型测试的比较来验证仿真结果。在比较的基础上，讨论了环境负荷的影响及其对运行性能的影响。直线航向采用基于比例微分舵控制的轨迹跟踪方法。在各种环境负荷条件下，不仅评估速度损失，而且评估路线维护的态度。通过与现有自由运行模型测试的比较来验证仿真结果。在比较的基础上，讨论了环境负荷的影响及其对运行性能的影响。直线航向采用基于比例微分舵控制的轨迹跟踪方法。在各种环境负荷条件下，不仅评估速度损失，而且评估路线维护的态度。通过与现有自由运行模型测试的比较来验证仿真结果。在比较的基础上，讨论了环境负荷的影响及其对运行性能的影响。