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Nicholas Buzbuchi, Dinu Taraza, Dimitrios. V. Lyridis. Theoretical and Experimental Study of the Torsional, Bending and Axial Coupled Vibration of Marine Diesel Engine Shafting System. In Bulletin of the Marine Engineering Society in Japan (MESJ), the Fifth International Symposium on Marine Engineering ISME, Yokohama. 1995.

Abstract: Due to the complicated shape of the marine Diesel engine crankshaft, its deformations also have a complex nature causing coupling phenomena among its individual vibration types: torsional, bending and axial. Up to now, the vibrations of shafting systems driven by marine Diesel engines were in general calculated by considering only the torsion and axial coupling, or by much simplifying the real formula of the crank. The present study proposes a more flexible and realistic model based on the finite element method (FEM) for the calculation of the excitations on coupled vibrations of marine Diesel engines. The model assumes a spatial beam structure with a uniformly distributed mass and concentrated masses in specific nodes. The entire set of exciting forces (including engine and propeller excitations) has been taken into account. This model has been verified through experimental investigations. It has been concluded that the torsion vibrations are dominant relatively to the propeller thrust fluctuations in exciting axial vibrations. The method reveals that the axial vibrations reach annoying levels and occasionally indicates the necessity of axial dampers mounting.

Keywords: Two-stroke marine Diesel, Diesel engine shafting system, coupled vibrations

Posted by Nicolae Buzbuchi

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