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http://dx.doi.org/10.5916/jkosme.2017.41.3.202

Optimum design of propulsion shafting system considering characteristics of a viscous damper applied with high-viscosity silicon oil  

Kim, Yang-Gon (Korea Register of Shipping)
Cho, Kwon-Hae (Department of Offshore Plant Management, Korea Maritime and Ocean University)
Kim, Ue-Kan (Division of Mechanical Systems Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.41, no.3, 2017 , pp. 202-208 More about this Journal
Abstract
The recently developed marine engines for propulsion of ships have higher torsional exciting force than previous engines to improve the propulsion efficiency and to reduce specific fuel oil consumption. As a result, a viscous damper or viscous-spring damper is installed in front of marine engine to control the torsional vibration. In the case of viscous damper, it is supposed that there is no elastic connection in the silicon oil, which is filled between the damper housing and inertia ring. However, In reality, the silicon oil with high viscosity possesses torsional stiffness and has non-linear dynamic characteristics according to the operating temperature and frequency of the viscous damper. In this study, the damping characteristics of a viscous damper used to control the torsional vibration of the shafting system have been reviewed and the characteristics of torsional vibration of the shafting system equipped with a corresponding viscous damper have been examined. In addition, it is examined how to interpret the theoretically optimal dynamic characteristics of a viscous damper for this purpose, and the optimum design for the propulsion shafting system has been suggested considering the operating temperature and aging. when the torsional vibration of the shafting system is controlled by a viscous damper filled with highly viscous silicon oil.
Keywords
Viscous damper; High-viscosity silicon oil; Aging phenomenon; Torsional vibration; Propulsion shafting system;
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