Abstract
This paper shows the stability characteristics of a flexible rotor supported in three types of multi-lobe bearings, i.e. 2-lobe bearings, 3-lobe bearings and 4-lobe bearings, and tilting pad journal bearings theoretically. Angular spring and angular damping coefficients of oil film of the bearings are calculated and the effects of the preload factor on the coefficients are discussed. With a Jeffcott rotor model considering the angular spring and angular damping coefficients, stability charts are made under the wide range of operating conditions, and show that 2-lobe bearings with a high preload factor cover much larger stable region in the stability charts than the other bearings, and 3-lobe bearings, 4-lobe bearings and tilting pad journal bearings with line contact pivots do not have special advantages in comparison with 2-lobe bearings. From the results, it is concluded that 2-lobe bearings with a high preload factor are most suitable for supporting the flexible rotor.
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