Characteristics of propulsion shafting system in ships with engine acceleration problems in the barred speed range

In this study, the characteristics of the torsional vibration in a propulsion shafting system equipped with a fuel saving ultra-long stroke engine were reviewed. This review included the technology developed for improvement of the acceleration capacity in low load ranges in eco-ships. Then a proper examination was conducted of methods for alternative design of propulsion shafting systems to cope with the engine acceleration problem in the barred speed range.