練習船「豊潮丸」の操縦性に及ぼすトリム影響

概要

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Fuliscale trials were carried out to capture the trim effect on maneuverability of a training ship "ToyoshioMaru" with the azimuth propellers which are arranged in parallel at stern part. Turning test and zig-zag maneuver test were conducted in three load conditions with different trim. Three K-GPS antennas were used for measuring 6-DOF motion of the ship. This ship has superior turning performance in any trimmed conditions: tactical diameter is almost 1 .8L where L is ship length when the azimuth angle is 35 degrees. However, the course instability appeared in even keel condition. The instability was significantly improved in the stern-trimmed condition. We found that change of hydrodynamic derivatives with respect to hull drift angle (hull damping forces) in trimmed condition contributes to the improvement of the course instability through the captive model test.
2012-03-25