EHD Analysis of a Four-Lobe Pressure Dam Bearing with Rigid and Flexible Rotors

Authors:

G. Bhushan (NIT Kurukshetra, Haryana)

S. S. Rattan (NIT Kurukshetra, Haryana)

N.P. Mehta Director (M.M. Engineering College, Ambala, Haryana)

Abstract:

It is observed that among multi-lobe pressure dam bearings, a four-lobe bearing pressure dam possesses good stability characteristics. A four-lobe pressure dam bearing is produced by cutting two pressure dams on the upper two lobes and two relief-tracks on the lower two lobes of an ordinary four-lobe bearing. The elastohydrodynamic analysis of a four-lobe pressure dam bearing has been described in this paper. The results indicate that liner flexibility considerably affects the stability of a four-lobe pressure dam bearing. The minimum threshold speed decreases whereas the zone of infinite stability increases with increase in the liner flexibility. The rotor flexibility aversely affects the minimum threshold speed but the zone of infinite stability remains unaffected.