Studying on Stability of Rotor-bearing System Subjected to the Labyrinth Seal Force

The influence of labyrinth seal force on the static equilibrium position of the journal bearing has been studied profoundly.It indicates that the labyrinth seal force can change both the static and dynamic characteristics of the bearing.The first critical speed and its log-decrement ratio for the rotor system have been computed when the labyrinth seal force with accompany with the oil-film force have been taken into consideration.It shows that the influence of labyrinth seal force on the stability is complicated,and there exist many influencing factors such as inlet and discharge pressure,inlet circumferential speed,labyrinth seal parameters,etc.