Effect of Engine Output on Maneuverability of a VLCC in Still Water and Adverse Weather Conditions
Effect of Engine Output on Maneuverability of a VLCC in Still Water and Adverse Weather Conditions
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发动机输出对静水和恶劣天气条件下 VLCC 操纵性的影响
DOI：
10.1007/s00773-017-0435-0
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
R.
中科院分区：
文献类型：
--
作者：
Yasukawa;H.;Zaky;M.;Yonemasu;I;Miyake;R.
在这项研究中，MMG为基础的操纵模拟方法（Yasukawa和Yoshimura，J Mar Sci Technol 20（1）：37-52，1）被用来研究VLCC在静水和恶劣天气条件下的操纵性。具体而言，调查涉及的情况是，由于节能技术的进步，超大型油轮的发动机输出大幅减少。第一，VLCC的能效设计指数（EEDI）降低30%（IMO MEPC 63/23，Annex 8，Resolution MEPC.212（63），2012 guidelines on the method of calculating on the reached EEDI for New Ships，2）（Step 3）实际上计划通过采用能量效率装置、大直径和低转速螺旋桨等将传统VLCC（Step 0）改造成新船。在静水和恶劣天气条件下进行了两艘船的操纵模拟（Step 0和Step 3）。据观察，Step 3在静水条件下满足IMO操纵标准。然而，步骤3的机动性比步骤0差，因为舵力由于小的螺旋桨负载而减小，这是由小的发动机输出引起的。此外，在不利天气条件下，Step 3的稳态航行性能，如检查舵、船体漂移角和速度下降，与Step 0相比，通常更差。此外，在步骤3的情况下，路线改变能力也变差。然而，由于强风和大浪引起的大的外部横向力的存在，舵力的差异变得不那么明显，因此，在大博福特尺度下，第0步和第3步的轨迹之间的差异减小了。
In this study, an MMG-based maneuvering simulation method (Yasukawa and Yoshimura, J Mar Sci Technol 20(1):37–52, 1) was used to investigate the maneuverability of a VLCC in still water and adverse weather conditions. Specifically, the investigation involved a situation where the engine output of a VLCC was significantly reduced owing to advances in energy-saving technology. First, a VLCC with 30% reduced Energy Efficiency Design Index (EEDI) (IMO MEPC 63/23, Annex 8, Resolution MEPC.212(63), 2012 guidelines on the method of calculation on the attained EEDI for New Ships, 2) (Step3) is actually planned to the conventional VLCC (Step0) by adoption of energy efficiency devices, a large-diameter and low-revolution propeller, etc. Next, maneuvering simulations of two ships (Step0 and Step3) were performed in still water and adverse weather conditions. It was observed that Step3 satisfied IMO maneuvering criteria in the still water condition. However, the maneuverability of Step3 was worse than that of Step0 since the rudder force was reduced owing to the low propeller load, which resulted from the small engine output. Additionally, steady-state sailing performance of Step3 in adverse weather conditions, such as check helm, hull drift angle, and speed drop, generally worsened when compared with those of Step0. Furthermore, course changing ability also deteriorated in the case of Step3. However, the difference between the trajectories of Step0 and Step3 reduced with respect to the large Beaufort scale since the difference in the rudder force became less noticeable owing to the presence of large external lateral forces caused by strong winds and waves.