Prediction of Maneuvering Motion by the Hydrodynamic Mathematical Model Including Newly Proposed Interference Effects between a Hull, a Propeller and a Rudder.

Abstract

Interference effect coefficients between a hull, a propeller and a rudder were newly proposed, which were arranged together with ship particulars, so they can be estimated without model tests and easily treated in a program for numerical simulation of maneuvering motion. This prediction method was applied for some kinds of model ships in full load condition and ballast load condition, and predicted values of maneuvering motions were compared with the results of free running model tests. Predicted maneuvering motions themselves, propeller thrust and rudder force under maneuvering motions were coincident with those measured values under free running model tests. In the latter half of this paper, a method of scale effect correction for the coefficients of the hydrodynamic mathematical model was proposed. Results of maneuvering trial for full scale ships were compared with predicted results for those, and it became evident that the predicted results were rather similar to the others. Consequently, the prediction method with the interference effect coefficients becomes evident as actually usefull.