The vibration of a huge centrifugal pump with nine vaned
was monitored. The power and revolution of the pump motor
are 160 kW, 2975 rpm, respectively. The reference measurement
was taken on 17 October 2001 (Figs. 2 and 3). As shown
from reference measurement, vibration behaviour of the pump
inner bearing composes of multipliers of the shaft rotation in
the spectrum graph and irregular impact signals in the time
domain waveform graph.