Force modeling of zero/low-velocity fin stabilizer and hydrofoil profile optimization

摘要

Fin stabilizers have been widely used to reduce the roll motion of ships at medium-high velocities. However, the anti-rolling efficiency of the traditional fin declines rapidly as the speed of the ship decreases. To enable more efficient use of fin stabilizers across the whole speed range, dynamics of fins at zero-low velocity were derived. Then, the proposed model was verified by experiment and the numerical results were compared with those of previous studies. To obtain a balance between the performance of the hydrofoil profile at zero-low and medium-high speed, we determined desirable ranges for various hydrofoil profile parameters including sweep angle, aspect ratio, and relative position of the shaft for non-retractable fins. Finally, tests were conducted using forced ship roll motion to determine the fin-induced anti-rolling moment and to test the optimized hydrofoil profile under real conditions.