Pengaruh Penambahan Bilge Keel Terhadap Rao (Response Amplitude Operator) Gerakan Roll Kapal Begoung Madura

Roll motion is the most critical response for traditional fishing vessels, particularly when encountering beam seas, which pose a significant risk of capsizing. The Begoung Madura vessel, characterized by its U-shaped hull and low roll damping, is highly susceptible to resonant roll motions. This study aims to analyze the effect of adding a flat bar bilge keel on the roll motion response of the Begoung Madura vessel. The method employed is hydrodynamic numerical simulation using a time-domain approach within the ANSYS AQWA software. The simulations were conducted under irregular wave conditions using the JONSWAP spectrum, with a beam sea wave direction (90°) and a constant vessel speed of 10 knots. Nine bilge keel configurations were examined, combining variations in installation positions (0.2T, 0.4T, 0.6T) and installation angles (15°, 30°, 45°). The analysis was performed by comparing the Root Mean Square (RMS) values of the roll response for each variation against the model without a bilge keel. The results indicate that the bilge keel configuration at the 0.4T position with a 15° angle (V4) is the most optimal, achieving an 8.0% reduction in the RMS roll value compared to the baseline vessel, with the lowest RMS value recorded at 0.16060°.