Fatigue assessment of the propulsion shafting system in eco-ships with an engine acceleration problem
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초록
The ultra-long stroke engine (G-type) was developed to generate greater power at lower speeds than previous designs, such as the super long stroke engine (S-type). The new design was intended to improve propulsion efficiency by adopting a higher stroke bore ratio and larger diameter propeller turning at lower speed. In recent cases, however, eco-ships have experienced problems with not passing quickly through the critical speed within the overall range of operating speeds. This study reviewed the vibration characteristics of a propulsion shafting system installed in eco-ships with G-type engines to determined proper measures for avoiding fatigue fracture of the shafts. Examples of propulsion shafting design for several types of vessels were considered based on a detailed method for shaft fatigue estimation, and the results were compared with those of existing simplified methods such as IACS UR M68 and optimum damper design theory.
Abstract
The ultra-long stroke engine (G-type) was developed to generate greater power at lower speeds than previous designs, such as the super long stroke engine (S-type). The new design was intended to improve propulsion efficiency by adopting a higher stroke bore ratio and larger diameter propeller turning at lower speed. In recent cases, however, eco-ships have experienced problems with not passing quickly through the critical speed within the overall range of operating speeds. This study reviewed the vibration characteristics of a propulsion shafting system installed in eco-ships with G-type engines to determined proper measures for avoiding fatigue fracture of the shafts. Examples of propulsion shafting design for several types of vessels were considered based on a detailed method for shaft fatigue estimation, and the results were compared with those of existing simplified methods such as IACS UR M68 and optimum damper design theory.
참고문헌 (18)
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