Prospects of using vibration monitoring to assess the development of torsional vibrations in marine propulsion systems

Vibration and vibrations occurring during the operation of a ship's power plant remain dangerous phenomena that lead to the occurrence of fatigue cracks and destruction of elements of machine-propulsion systems, supporting structures and other consequences. The resonance of vibrations of various types is especially dangerous, as a result of which the impact of vibration on ship structures and equipment increases several times. Torsional vibrations in marine propulsion systems cause additional vibration load, but in practical studies they are measured separately from other types of vibrations, while it is necessary to install measuring equipment directly on a rotating shaft, which is associated with certain difficulties. The article presents the results of studies that confirm the possibility of evaluating torsional vibrations by measuring the vibration of the bow of the diesel hull. It is determined that the relationship between torsional vibrations and vibration is manifested most strongly in the classical scheme of power transmission from a medium-speed engine to a fixed-pitch propeller. As a result of practical research on ships of projects 1557 and 81200, resonant torsional vibration frequencies were established by measuring vibration, which was confirmed by direct measurements of torsional vibrations. The studies conducted indicate the prospects of using vibration monitoring to assess the parameters of torsional vibrations of marine propulsion systems in the periods between routine torsiography or strain measurement.

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