浅水域における操縦数字モデルの検討 : とくに舵利きパラメータに対する浅水影響

概要

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In order to clarify shallow water effects on the various parameters necessary to predict the rudder normal force during manoeuvring motions, which are called rudder-effectiveness parameters in this paper, different kinds of captive model tests were extensively carried out for a particular ship. As a result, it is found that the rudder-effectiveness parameters are remarkably dependent on the water depth, and that intimate knowledge of those parameters at a certain water depth is essential for predicting manoeuvring motions at that depth with accuracy. In particular, both κ value and δ_R versus β relationship, which denote the increase of rudder inflow velocity and effective rudder inflow angle respectively, are most important. Prediction of rudder normal force in transient state during manoeuvring motions is not satisfactorily accurate especially in shallow water, although the steady turning characteristics may be predicted well by means of the mathematical model used in this paper. Lastly, it is shown that the full-scale manoeuvring motion can be successfully estimated from the results of model tests by taking account of the scale effects on the total resistance and the effective wake fraction.
社団法人日本船舶海洋工学会の論文