8. Interference Effects between the Hull, Propeller and Rudder of a Hydrodynamic Mathematical Model in Maneuvering Motion

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Many expressions of hydrodynamic forces on a ship are proposed to construct a mathematical model for describing maneuvering motion. One of them is the mathematical model which expresses hydrodynamic forces by considering the individual open-water characteristics of the hull, propeller and rudder and the interference effects among them. This mathematical model began to be commonly used because of its convenience in practical usage and rationality. However, when applying the model to a full shaped ship and predicting maneuvering motion at large helm angles by the analyzed results of the ordinary captive model tests, the predicted motions were very different from the measured motions of free running tests. And it was found that the difference was caused by poor treatment of the interference effects between the hull, propeller and rudder. In this paper, we proposed to resolve the problem by carrying out circular motions tests which correspond to steady turning. Further, we analyzed the test results and derived new expressions for the interference effects. The present coefficients describing interference effects were arranged together with the ship particulars, so they can be easily treated in the program for numerical simulations. The prediction of maneuvering motions corresponding to the free running tests were made. Judging from the coincidences between the predicted results and the measured ones, the new mathematical model was proved appropriate for describing the interference effects.
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8. Interference Effects between the Hull, Propeller and Rudder of a Hydrodynamic Mathematical Model in Maneuvering Motion

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