Control of ship noise by propeller
When the vibration caused by the propeller is severe, it may cause the fatigue damage of the hull. The propeller may also be a direct or annoying source of noise due to its vibration. The non-uniform water flow through the propeller is vibration and noise generation. The main reason. The study of the flow field condition and the modification of the stern line type if necessary to improve the part flow condition will be implemented in the design stage with model tests. The foundation of the propeller, such as the installation of protective devices on the hull to prevent strong impact Pressure. A proper clearance between the propeller and the hull is an important condition to ensure a small impact. The clearance value given in this article is recommended as the minimum value. The fins on the propeller will improve the flow field characteristics and reduce to some extent Vibration level. In improving the flow field characteristics, the propeller duct may be effective. However, it is worth noting that the stern structure connecting the duct is poorly strengthened.
