Sensitivity Study of Manoeuvring Motion of Ships using Whole Ship Model

Fakhri Akbar Ayub, Y. Furukawa, Hiroshi Ibaragi
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Abstract

Accurate estimation of a ship manoeuvrability is important issue as for the safety of ships at the sea. To accomplish the prediction of ship manoeuvrability with high accuracy using mathematical models for hydrodynamic forces acting on a ship, the values of hydrodynamic coefficients included in the mathematical model should have accurate values. Generally, ship manoeuvrability is evaluated by standard manoeuvring tests such as turning ability, course-keeping and yaw-checking abilities and so on. By investigating the sensitivity of each hydrodynamic coefficient on the results of the standard manoeuvring tests, it is possible to understand which coefficients should be mostly paid attention when they are obtained by numerical simulations. In this paper, sensitivity analysis of all the hydrodynamic derivatives using whole ship model is performed by using the conventional Monte Carlo Simulation (MCS) to evaluate the influence of coefficient on performance indices such as advance, transfer, tactical diameter and 1st and 2nd overshoot angles. The values of hydrodynamic derivatives are varied with the range of standard deviation which is assumed as 10% of their mean value. The results of simulation showed that which hydrodynamic coefficients have dominant effect on the performance indices of standard manoeuvring tests.
基于全船模型的船舶操纵运动灵敏度研究
船舶操纵性的准确估计是关系到海上船舶安全的重要问题。为了利用作用在船舶上的水动力数学模型实现对船舶操纵性的高精度预测,数学模型中所包含的水动力系数值必须具有精确值。一般来说,船舶的操纵性是通过标准的操纵性试验来评价的,如转向能力、航向保持能力和偏航检查能力等。通过研究各水动力系数对标准操纵试验结果的敏感性,可以了解数值模拟得到的系数中哪些是最应注意的。本文采用传统的蒙特卡罗仿真(Monte Carlo Simulation, MCS)方法,对全船模型的所有水动力导数进行敏感性分析,评估系数对推进、转移、战术直径、一超调角和二超调角等性能指标的影响。水动力导数值随标准差范围的变化而变化,标准差为其平均值的10%。仿真结果表明,哪些水动力系数对标准机动试验的性能指标有主导影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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