Diagnosing the shafting alignment in the COGAG propulsion system by means of vibration measurement

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Diagnosing the shafting alignment in the COGAG propulsion system by means of vibration measurement

Grzadziela, A.

The application of vibroacoustic analysis methods has been presented in this paper. The described conception concerns evaluative process of the centring state in a transmission shaft within powered marine gas turbine system as a function of ships displacement. Some structural components of the gas turbine unit and reduction gearbox have been selected for the analysis. Some results of the vibro-tests have been presented as well. The tests had been worked out during sea trials. From among all considered diagnostic parameters first harmonic mean amplitudes of the vertical and horizontal vibration signals of the propulsion turbine are the most sensitive. This element of BDS system is accepted and used in the ships, which are powered by the COGAG power plant. The presented method is the typical database for the monitoring system of shaft alignment off-line and on-line type. This described idea is based on the researches of the corvette power plants.