An Estimation Method for the Torsional Vibration of the Marine Propulsion System


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The paper presents an estimation analysis methopd for the natural mode and frequency of the torsional vibrations of a marine power transmission system. A typical merchantman marine propulsion system is made up of a slow speed main engine connected to a directly driven propeller by a relatively short shaft line. Although all classification societies require calculating the operating parameters of the propulsion system, however, they have no simplified formulas. The torsional vibrations of the marine power transmission system are usually the most dangerous for the shaft line and crankshaft. Numerical algorithms based mostly on the Finite Element Method (FEM) are unobtainable and not useful for a ship crew. The chief of marine engineers should have checked a possibility of the analysis and measurements of torsional vibrations. The authors have investigated an estimation method of the torsional vibrations of the system. The article deals with a simulation method for more difficult parameters of the propulsion system like propeller water added mass moment of inertia. The paper also briefly describes the advantages and disadvantages of the undercritical and overcritical propulsion system and discusses calculation results included in the final part of the work. The introduced calculation method has been verified comparing detailed FEM estimations and the measurements of real ships.



Solid State Phenomena (Volumes 220-221)

Edited by:

Algirdas V. Valiulis, Olegas Černašėjus and Vadim Mokšin




L. Murawski and A. Charchalis, "An Estimation Method for the Torsional Vibration of the Marine Propulsion System", Solid State Phenomena, Vols. 220-221, pp. 71-80, 2015

Online since:

January 2015




* - Corresponding Author

[1] L. Brydum , S.B. Jakobsen, Vibration characteristics of two-stroke, low speed diesel engines, MAN B&W Diesel a/s, Copenhagen, 1987, p.1–16.

[2] M. Geveci , A.W. Osburn , M.A. Franchek, An investigation of crankshaft oscillations for cylinder health diagnostics, Mechanical Systems and Signal Processing 19 (2005) 1107–1134.


[3] E.J. Nestorides, A Handbook on Torsional Vibration, Cambridge University Press, (1958).

[4] W.K. Wilson, Practical Solution of Torsional Vibration Problems, Chapman & Hall LTD, London, (1963).

[5] J. A. Aarvik, Software for shafting systems, DNV Software News (3) (2005) 11 p.

[6] L. Murawski, Axial vibrations of a propulsion system taking into account the couplings and the boundary conditions, Journal of Marine Science and Technology, Tokyo, 9(4) (2004) 171–181.


[7] L. Murawski, Shaft line whirling vibrations: effects of numerical assumptions on analysis results, Marine Technology and SNAME News 42(2) (2005) 53–61.

[8] R. Dien, H. Schwanecke, Die propellerbedingte wechselwirkung zwischen schiff und maschine – teil 2. Motortechnische 34(11) (1973) 45–56.

[9] C. A. M. van der Linden, The axial stiffness of marine diesel engine crankshaft – Part II, International Shipbuilding Progress 15(163) (March 1968) 96–105.

[10] Ship Vibration, GL-technology, Hamburg 5 (2001) 52 p.