Balancing Of Multimass Flexible Rotors
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In this paper, we will consider only the problem of synchronous rotor response due to unbalance. There are numerous complex nonsynchronous vibrations that can occur in rotating machinery. Quite often the nonsynchronous motion can not be corrected merely by improving the rotor balance. The causes of this may be due to self-excited whirl motion caused by fluid film hearings, seals, balance pistons, aerodynamic effects, internal friction, shaft rubs, shaft asymmetry, or by external excitations through gear boxes, misaligned couplings, piping acoustics or transmitted foundation vibrations.
Gunter, E. J.; Barrett, L. E.; Allaire, P. E. (1976). Balancing Of Multimass Flexible Rotors. Texas A&M University. Gas Turbine Laboratories. Available electronically from