Abstract
Captive model tests are conducted for a pure car carrier in the proximity of a sloped bank with variations in water depth, distance between ship hull and bank, hull drift angle and heel angle. Using the hydrodynamic derivatives obtained, the check helm and hull drift angle required at equilibrium conditions are estimated. Course stability of the ship sailing in the proximity of the bank is also studied based on a simplified analysis method. In h∕d=1.2 where h∕d means ratio of water depth h to ship draft d, the check helm of the ship reaches 35° near η0∕L=0.27 where η0 is the distance between the ship center line and the bank. Although this ship is course unstable in case of no rudder control, the ship becomes course stable in any water depths by employing the autopilot with appropriate control gains. The present analysis method is useful for conventionally assessing the course stability of a ship in the proximity of a bank.
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