ABSTRACT

In this article, the comparing research on ship maneuvering between full scale ship and the model was done for the YUKUN training ship, and related papers are very few in the literature. The sea trial such as speed tests, turning tests and zigzag tests was carried out and the trajectory, roll, pitch, RPM and the power of the main engine were obtained. Based on the data of both sea trial and model test, the trajectory, roll, pitch, RPM and the power of the main engine were compared. The model correction for predicting the full scale ship maneuvering such as the advance, the tactical diameter and the overshoot angle was finished for YUNKUN training ship. Some suggestions were made to further develop the study such as a series of model, model size, the control of the RPM.

INTRODUCTION

The scale effect between full scale ship and model has not solved on ship maneuvering though many scholars has done their best by model tests and numerical calculation for many years(Ueno, M and Tsukada, Y(2013), Shin, S, Ahn, K, Sung, Y and Oh, S(2012), Wang, YC, CAI, RZ, LI, XB(2005)). At present, the data of model test has to be directly applied to predict full scale ship maneuvering, and it is impossible that the characteristic parameters such as the advance, tactical diameter and overshoot angle were underestimated, which will has a large effect on the seagoing ship. It is very difficult and complex to solve the scale effect in model tests for predicting the full scale ship maneuvering. For dozens of years, this problem is an eternal topic in ITTC reports. Some critical factors to scale effects such as model size, model self-propulsion point (MSPP) and ship self-propulsion point (SSPP) have to take in consideration(). To apply a self-propulsion point different from MSPP in free running model tests, it is necessary to equip the ship model with an auxiliary device to apply a towing force. Wang, SL et al(1998) put forward the calculation method of correspondent rudder angle comprising rectify method. Sun, M et al.(2012) presented research on the influence of the Reynolds number on the hydrodynamic coefficients in submarine model tests. Tsukada Y et al. (2013) developed a prototype of an auxiliary thruster that assists free running model ships' propellers. Therefore, it is not easy to establish a standard full scale extrapolation method from maneuvering tests in the near future, like a full-scale powering prediction method.

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