Effects of shaft shape errors are studied on dynamic characteristics of a rotor-bearing system. Stability characteristics of the cylindrical journal bearing are studied. It is shown that the rotating speed at which the oil whip occurs increases when the shape errors exit. And, there is a threshold speed of the bearing with shaft shape errors; before the speed is increased to the threshold, orbits of the center of the journal decrease, and when the speed exceeds the threshold, the orbits increase dramatically and oil whip appears. Furthermore, the quantitative relationship between shaft shape errors and bearing reaction forces of the rotor-bearing system is obtained, which is verified by experiments using rotors with different machining precisions. In order to reduce computing time, variational principle is applied when solving Reynolds’ equation.
Effects of Shaft Shape Errors on the Dynamic Characteristics of a Rotor-Bearing System
Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received January 22, 2019; final manuscript received June 18, 2019; published online July 17, 2019. Assoc. Editor: Alan Palazzolo.
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Sun, F., Zhang, X., Wang, X., Su, Z., and Wang, D. (July 17, 2019). "Effects of Shaft Shape Errors on the Dynamic Characteristics of a Rotor-Bearing System." ASME. J. Tribol. October 2019; 141(10): 101701. https://doi.org/10.1115/1.4044083
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