An experimental study on the dynamic behavior of propulsion shafting alignment in a hybrid vessel

The alignment of propulsion shafting and its dynamic characteristics play a critical role in maintaining vessel integrity and avoiding contact-related incidents. This research delves into the impact of various maneuvering conditions on the whirling vibration of the propulsion motor shafts in a dual hybrid propulsion system. The study focuses on the shifts and orbits of shaft movement during maneuvers, demonstrating how propeller force fluctuations directly affect the shaft stability. Furthermore, this investigation highlights the substantial differences in the dynamic behavior between the two shaft lines. By employing experimental observations and analysis, the paper illuminates potential risks associated with shaft alignment and offers recommendations for mitigating potential contact-related risks. Consequently, the most critical conditions were identified during rapid turning maneuvers: starboard turns presented the critical condition for the PORT shaft line, whereas for the STBD (starboard) one, it was during port turns.