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Some aspects of torsional vibration analysis methods of marine power transmission systems

Murawski L.

Journal of Polish CIMAC

2012

Vol. 7, no 1

175-182

In the paper, the torsional vibrations of marine power transmission system's nonlinear method have been presented. Short presentation of marine propulsion system evolution (and its influence on ship's vibration level) in the last 30 years was included in the introduction. Some aspects of the modeling method of the elements of propulsion system have been shown. Comparison between one-degree model and 3-D Finite Element Method model was discussed. Short description of advantages and disadvantages of the undercritical and overcritical propulsion system was presented. Modeling method of propeller's mass characteristics and damping recalculation method have been shown as an example. Specialised software, for the marine power transmission system torsional vibration’s analysis, made by the author, has been performed as an iterative process. Also example of torsional vibration analysis, for tanker ship, was presented in the paper. A discussion about calculation results was included in the final part of the paper. Overcritical power transmission system is better for typical ship (with slow-speed main engine and directly driven propeller).