A STUDY ON THE PREDICTION OF STABILITY BEHAVIOUR FOR FLEXIBLE ROTOR IN JOURNAL BEARINGS

The influence of the labyrinth seals on the dynamic behaviour of a flexible rotor in journal bearings is investigated. In particular a code which makes possible the determination of the stiffness and damping coefficients and the calculus of the stability threshold in absence of unbalance is carried up. The determination of the oil film pressure in journal bearings and in the labyrinth seal is made using the Warner's hypothesis and the bulk-flow model with two-control-volume, respectively.