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http://dx.doi.org/10.5050/KSNVE.2014.24.9.667

Transient Torsional Vibration Analysis of Ice-class Propulsion Shafting System Driven by Electric Motor  

Barro, Ronald D. (Marine Engineering Division, Mokpo National Maritime University)
Lee, Don Chool (Marine Engineering Division, Mokpo National Maritime University)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.24, no.9, 2014 , pp. 667-674 More about this Journal
Abstract
A ship's propulsion shafting system is subjected to varying magnitudes of intermittent loadings that pose great risks such as failure. Consequently, the dynamic characteristic of a propulsion shafting system must be designed to withstand the resonance that occurs during operation. This resonance results from hydrodynamic interaction between the propeller and fluid. For ice-class vessels, this interaction takes place between the propeller and ice. Producing load- and resonance-induced stresses, the propeller-ice interaction is the primary source of excitation, making it a major focus in the design requirements of propulsion shafting systems. This paper examines the transient torsional vibration response of the propulsion shafting system of an ice-class research vessel. The propulsion train is composed of an electric motor, flexible coupling, spherical gears, and a propeller configuration. In this paper, the theoretical analysis of transient torsional vibration and propeller-ice interaction loading is first discussed, followed by an explanation of the actual transient torsional vibration measurements. Measurement data for the analysis were compared with an applied estimation factor for the propulsion shafting design torque limit, and they were evaluated using an existing international standard. Addressing the transient torsional vibration of a propulsion shafting system with an electric motor, this paper also illustrates the influence of flexible coupling stiffness design on resulting resonance. Lastly, the paper concludes with a proposal to further study the existence of negative torque on a gear train and its overall effect on propulsion shafting systems.
Keywords
Electric Motor; Propeller-ice Interaction; Resonance; Transient Torsional Vibration;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Barro, R. D. and Lee, D. C., 2011, Excitation Response Estimation of Polar Class Vessel Propulsion Shafting System, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 21, No. 12, pp. 1166-1176.   과학기술학회마을   DOI   ScienceOn
2 Gilmour, T. H., 2008, Arctic Shipping and Class, U.S. Maritime Administration Arctic Shipping Conference.
3 Szolc, T. and Jankowski, L., 2008, Active Control of Transient Torsional Vibrations Due to Run-up of a Rotor Machine Driven by the Electric Motor, XXIII Symposium - Vibrations in Physical System.
4 Szenasi, F. R. and Von Nimitz, W. W., 1978, Transient Analyses of Synchronous Motor Trains, Proceedings of the Seventh Turbomachinery Symposium.
5 Chang, S. Y., 2004, Studies of Newmark Method for Solving Nonlinear Systems: (I) Basic Analysis, Journal of the Chinese Institute of Engineers, Vol. 27, No. 5, pp. 651-662.   DOI
6 Lee, D. C. and Yu, J. D., 2003, Transient and Unstable Torsional Vibrations on a 4-stroke Marine Diesel Engine, ICES2003-578.
7 Korean Registry of Shipping, 2012, Guidance Relating to the Rules for the Classification of Steel Ships.
8 Batrak, Y., Torsional Vibration Calculation Issues with Propulsion Systems, ShaftDesigner - The Shaft Calculation Software.