Oil Whirl of Flexible Rotors
- 1 June 1962
- journal article
- research article
- Published by SAGE Publications in Proceedings of the Institution of Mechanical Engineers
- Vol. 176 (1) , 523-531
- https://doi.org/10.1243/pime_proc_1962_176_046_02
Abstract
The equations for a flexible rotor in journal bearings are set up and solved, extending the method previously used by Hummel and Cameron. It is shown that if w is the natural elastic frequency of the rotor, A the resonant oil frequency for an infinitely stiff but otherwise identical rotor, then the combined frequency s is given by l/ s2 = 1/Λ2 + 1/ w2. This resonant frequency will usually occur when it equals 1/2 the shaft rotational frequency The frequency calculated by the method given here is applied to a number of cases of large turbines and alternators and found to give quite satisfactory resultsKeywords
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