Abstract
An inverted three-lobe pressure dam bearing which is produced by cutting a pressure dams on the upper lobe and two relief-tracks on the lower two lobes of an ordinary inverted three-lobe bearing is found to be more stable than an inverted three-lobe bearing. In this paper an inverted three-lobe pressure dam bearing supporting rigid and flexible rotors is analytically investigated to determine its performance when L/D ratio is varied in the range 0.8-1.5. The static and dynamic characteristics are studied at various L/D ratios. The results show that the stability of an inverted three-lobe pressure dam bearing increases with decrease in L/D ratios both for rigid as well as flexible rotors.
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