Oil-Film Whirl—An Investigation of Disturbances Due to Oil Films in Journal Bearings

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Abstract
With three rotors and five bearings, tests have been run with oil at various viscosities to determine conditions defining a range of stable operation with cylindrical journal bearings at speeds above twice critical speed. It is concluded that short bearings, rather large clearance ratios, and moderate unit bearing loads favor a wide range of such stable operation, up to more than five times critical speed. Slight misalignment resulted in a remarkable increase of the range. After discussion of historical background and consideration of recently reported findings that seem to be at variance with those reported here, it is suggested that two substantially different phenomena should be recognized. Results of a large number of runs under which the whirl was impending (the border line of instability) are presented in two tables.

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