Author(s)

Fakhri Akbar Ayub,Yoshitaka Furukawa, and Hiroshi Ibaragi

Corresponding Author

Fakhri Akbar Ayub

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.

KEYWORDS

Sensitivity Analysis, Monte Carlo Simulation, Ship Manoeuvrability, Hydrodynamic Coefficients