S. Edwards et al., Experimental identification of excitation and support parameters of a flexible rotor-bearings-foundation system from a single run-down, J SOUND VIB, 232(5), 2000, pp. 963-992
Field balancing of rotors with unknown foundation dynamics is more often th
an not a painstaking, time-consuming and expensive process. A recent method
to identify both the excitation and flexible support parameters of a rotor
-bearings-foundation system has been verified experimentally in this paper.
In addition to mass unbalance, the excitation due to a bent rotor has been
included in the method, which has great potential in the field, since it a
llows balancing to be performed using data obtained from just a single run-
up or run-down. Using this single-shot balancing technique, vibration level
s of an experimental rotor rig were successfully reduced to less than one-t
enth of their original levels. The geometry of a bent rotor has also been a
ccurately identified and it was shown that including bend identification in
those cases where only unbalance forcing was present in no way detracted f
rom the accuracy of the estimated unbalance or foundation parameters. The i
dentification of the flexible foundation parameters was generally successfu
l, with measured and estimated parameters matching very closely in most cas
es. The identification method was tested for a wide range of conditions, an
d proved suitably robust to changes in system configuration, noisy data and
modelling error. (C) 2000 Academic Press.