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Evaluation of speed loss in bulk carriers with actual data from rough sea voyages

机译：利用波涛汹涌的海上航行的实际数据评估散货船的速度损失

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摘要

The evaluation of speed loss is the most important studies in the optimal ship routing. However, the mode of speed loss during rough sea voyages is complicated because of the involvement of the human factor. A speed loss analysis is conducted to improve the accuracy of evaluation of measured data extracted from actual marine conditions. First, the conventional criteria to judge the deliberate speed reduction is summarized with the conventional ship maneuvering techniques. Second, a nationwide questionnaire for marine engineers implemented for engine safety during rough sea voyages is detailed. Third, these conventional criteria are validated by analyzing the collated data on accelerations, ship motions, navigation, and engine parameters. The limiting value of vertical acceleration agrees with that obtained via practical measurements. On the contrary, the limiting values of lateral acceleration, roll motions, probabilities of deck wetness, and slamming do not agree with that obtained via measurements. The probabilities of deck wetness, slamming, and propeller racing start to increase at approximately the same instant where the deliberate speed reduction occurs. Some relations between the deck and engine parameters detailed in this paper were found to be highly correlated. Finally, the results of the analysis were used to model simpler estimations.
机译：速度损失的评估是最佳船舶路线中最重要的研究。但是，由于人为因素的影响，在波涛汹涌的海上航行中速度损失的方式很复杂。进行速度损失分析以提高评估从实际海况中提取的测量数据的准确性。首先，用常规的船舶操纵技术总结了判断故意降低速度的常规标准。其次，详细介绍了针对海上工程师在海上航行中为发动机安全而实施的全国性问卷。第三，通过分析有关加速度，船舶运动，导航和发动机参数的整理数据，可以验证这些常规标准。垂直加速度的极限值与通过实际测量获得的极限值一致。相反，横向加速度，侧倾运动，甲板潮湿的可能性和砰击的极限值与通过测量获得的极限值不一致。在故意降速发生的大约同一瞬间，甲板潮湿，砰砰和螺旋桨飞行的可能性开始增加。发现本文详细介绍的甲板与发动机参数之间的某些关系是高度相关的。最后，分析的结果用于对更简单的估计进行建模。

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