Vibration diagnostic tests of marine gas turbine engines are performed as a research of on-line and off-line types.
On-line systems generally monitored one or two vibration symptoms, which asses the limited and/or the critical values
of parameters and they, potentially, can warn and/or shutdown engines. Off-line Systems are usually used for
vibration analysis during non-steady state of work. The paper presents a new method of vibration diagnostics of rotor
bearing system of gas turbine systems. The study assumes implementation of characteristics of vibration signals
during the shut-down process of the rotor. The shut-down process is non-stationary so the studies used the order
tracking procedure. Identified orders constitute individual characteristics as a function of changes of the rotational
speed and shut-down process time. These allow the observation of changes in the support rigidity of the rotor in the
frequency domain and change the bearing resistance torque as a function of changing time of the shut-down process.
The resulting characteristics are as reference fingerprints for each of the rotors. Changes in the characteristics of the
primary evidence of the processes of wear. Changes in the stiffness of rotor supports make change the amplitude of
orders and frequency of the resonance signals observed in the frequency domain - decreasing rotational speed. The
bearing wear results in changes in the shut-down time between successive intervals of characteristic rotational speed
and the total shut-down time.
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