Study on the vibration behavior of a G/T 3-ton class composite fishing boat hybrid propulsion system
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In recent years, eco-friendly ships have been widely used to optimize energy efficiency and prevent air pollution. Composite materials can reduce the weight of vessels, reduce maintenance costs and time, and maximize vessel life. In addition, if a ship is equipped with a hybrid propulsion system, its prime movers can be alternated, improving its flexibility in various maneuvering condi-tions. However, the vibration behavior of the ship should be confirmed when new materials are used for the ship hull and for new hybrid transmission configurations. In this study, the performance of a hybrid propulsion system for a 3-ton G/T-class composite fishing boat was evaluated through experiments during a sea trial. The results revealed that torsional vibration exhibits resonance in the propeller speed range of 300 to 350 rpm. The level of resonance is not sufficiently high to damage the shaft, but it may cause the electromagnetic clutch to slip. Thus, propeller efficiency is not maximized. Additionally, this results in a high level of structural vibra-tion. The propulsion system design must be modified to improve the vibration behavior of the ship.
Abstract
In recent years, eco-friendly ships have been widely used to optimize energy efficiency and prevent air pollution. Composite materials can reduce the weight of vessels, reduce maintenance costs and time, and maximize vessel life. In addition, if a ship is equipped with a hybrid propulsion system, its prime movers can be alternated, improving its flexibility in various maneuvering condi-tions. However, the vibration behavior of the ship should be confirmed when new materials are used for the ship hull and for new hybrid transmission configurations. In this study, the performance of a hybrid propulsion system for a 3-ton G/T-class composite fishing boat was evaluated through experiments during a sea trial. The results revealed that torsional vibration exhibits resonance in the propeller speed range of 300 to 350 rpm. The level of resonance is not sufficiently high to damage the shaft, but it may cause the electromagnetic clutch to slip. Thus, propeller efficiency is not maximized. Additionally, this results in a high level of structural vibra-tion. The propulsion system design must be modified to improve the vibration behavior of the ship.
참고문헌 (25)
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