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Abstract
The effects of changing the preload, offset factor, and load angle on three-lobe bearings were experimentally studied by testing a three-mass flexible rotor in seven different sets of three-lobe bearings. Figures showing the dependence of the instability threshold on load angle, for each bearing set, as well as the dependence of the instability threshold on preload and offset, are presented. The tests indicate that the dependence of instability threshold on load angle decreases as the offset factor increases. With an offset factor of 0.5, the instability threshold increases with larger preloads whereas, with the preload held constant at 0.75, the instability threshold tends to decrease as the offset factor increases. A comparison of theory to experiment shows agreement for the optimum load orientation within 30° for most bearings. The theoretical and experimental instability thresholds differ by up to 45 percent. Possible reasons for the large differences are discussed.
Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in New Orleans, Louisiana, October 5–7, 1981
Notes
Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in New Orleans, Louisiana, October 5–7, 1981
