Abstract
In order to increase ship performance in actual navigation conditions, a definite evaluation method of the performance should be established. For that purpose, a design index, 10 mode Index for Ships, is developed. The index consists of ship speed in ten kinds of weather conditions as well as ship speed in calm seas.The present paper prescribes a calculation method for the 10 mode Index for Ships. To obtain the ship speed in actual seas,equilibrium equations of external forces acting on a ship are calculated. Selected as the external forces acting on a ship are resistance in still water, propeller thrust, and resistance due to drift, steering, winds and waves. In calculating these forces, accuracy should be kept for resistance due to waves. Therefore, the calculation is developed based on the hybrid type procedure, which combines the model tests with the numerical calculation. In addition to this, a package program to calculate the index is developed.In the paper following verifications are carried out; 1) comparing calculations on added resistance in regular waves with other programs, 2) comparing tests of a container ship model in several ship model basins and 3) full scale measurement of a pure car carrier. From the verifications it is clarified that the hybrid calculation is robust to evaluate ship speed in actual seas.
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