Optimum Propeller Interaction Analysis of Harbourtug With Azimuth Thruster

Abstract

Determine the safety of tug operation at sea, especially in narrow shipping areas such as port areas, it is necessary to pay attention to the maneuverability of ships and the performance of the ship’s steering system. In ship maneuvering, a specially designed thruster with 360 degrees side thrust with a small turning angle is needed in order to produce a good ship movement performance. In this study, the authors designed a tugboat propeller ka-series four blades. The propeller can move 360 degrees so that the distribution of power is evenly distributed in all directions. The system is expected to provide extra thrust when needed in the process of maneuvering and docking the ship. Equipped with hydraulics used to quickly lift and lower the thruster and pull it back into the hull when not in use. The analysis results show that each propeller variation such as the difference in thrust value, torque value and resulting efficiency. From the analysis model, the highest thrust value was obtained in the first propeller model with a variation of P/D 1, AE/A0 0.45 valued at 306201.4. The lowest torque value is generated in the third propeller model with a variation of P/D 0.6, AE/A0 0.65 value at - 22400.2 Nm. Harbourtug requires a high thrust value, so it is advisable to use the first Propeller model with variations of P/D 1, AE/A0 0.45 The highest efficiency value is obtained in the first propeller model valued at 0.7151.