Abstract
An unusual analytical approach to oil whirl is presented. Instead of using linearized equations for the oil forces all the non-linear terms are retained. The complex equations are solved on an analogue computer, and the more important results are given which show the unusual vibration characteristics of an oil film. It is shown that self-sustained oscillations can exist and, with an exciting force, sub-harmonics are likely. Also the frequency of response may be a sub- or super-multiple of the exciting force.
Ocvirk's short bearing approximation is used as the basis of the analysis. It is recognized that it has certain deficiencies, and the results are therefore treated as indications and not as accurate predictions. Comparison to other theoretical and experimental work supports the validity of the present analysis.
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