Abstract:
Proposed in the article is the use of new high-information characteristics, in which capacity we used crosscorrelation
coefficients between vibration signals in space-distributed units of a rotating electric machine in
combination with amplitudes of vibration signals in the same units. It was theoretically proven that the said
characteristics make it possible to restore the information on the amplitudes and spatial localizations of occasional
uncompensated disturbing forces, the influence of which gives rise to vibrations during rotating electric
machines’ operation. Determined and theoretically substantiated was the duration of vibration signal’s temporal
realizations, which is advisable to use when obtaining vibration signals’ cross-correlation coefficients in
the units under investigation. It was found that duration of such realizations must be divisible by the frequency
of rotation period of electric machine’s rotor. Besides, adapted was the mathematical model for calculation
of cross-correlation coefficients taking into account the specificities of origin and the physical nature of vibration
signal, which enabled us, having significantly simplified the analytical calculations required for obtaining
the cross-correlation coefficients, to calculate cross-correlation coefficients based on measured values of their
temporal realizations directly in the real-time mode of electric power machine’s operation. The adequacy of
the statements set forth in the article and the informative value of proposed characteristics were proven by
way of computerized simulation.
