The vibration based diagnostics of ship propulsion systems
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/332358
Tipus de documentText en actes de congrés
Data publicació2015
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
The article has been worked out on the basis of the report devoted to the
conducted diagnostic investigations of the ship main propulsion unit’s mechanical system.
Gdansk University of Technology has been ordered with such investigations by the repair
Shipyard carrying out the ship’s overhaul. Diagnostic tests involved measurements and
analyses of the vibration signals generated in selected constructional kinematic pairs of the
identical (twin) starboard and portside marine propulsion lines. The vibration signals have
been registered at the representative load ranges. By this way the stability of the considered
mechanical unit has been estimated both in a global and local sense. Appearing at that time the
resonance phenomena which result in a kinetic energy dissipation of the ship main
propulsion unit’s masses being in a rotational movement have been identified. There
have been also localized places of the largest growth of the changeable internal
tensions’ amplitudes, what considerably constrains cycles number of the load alterations
at which elements transmitting the propulsion torque from engines to propellers crack, as a result
of the material fatigue phenomenon.
The most probable reasons of the mechanical unit’s enlarged vibration level have been pointed out
on the basis of a carried out analysis of the alignment results, the specifity of the applied main
engine running on the partial loads as well as the range of constructional changes
that had been made during the propulsion unit’s overhaul. Results of the repeated
diagnostic sea trials, carried out after the reduction gears’ modification recommended by the
Authors, confirmed a relevance of the earlier formulated diagnosis. The modification works aimed
to perform a resonance offset by the damping correction of hydraulic devices
additionally founded on the gears frames.
A technology of the marine propulsion shaft line’s transverse and longitudinal vibration
measurements carried out by means of the portable vibration register as well as a method of the
vibration spectral analysis have been focused within the program description of the
performed diagnostic investigations. They represented the base for a diagnostic
inference
about the considered mechanical unit’s dynamic state.
CitacióKorczewski, Z.; Rudnicki, J. The vibration based diagnostics of ship propulsion systems. A: MARINE VI. "MARINE VI : proceedings of the VI International Conference on Computational Methods in Marine Engineering". CIMNE, 2015, p. 535-545. ISBN 978-84-943928-6-3.
ISBN978-84-943928-6-3
Fitxers | Descripció | Mida | Format | Visualitza |
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Marine-2015-43_THE VIBRATION BASED DIAGNOSTICS.pdf | 2,962Mb | Visualitza/Obre |