Vibration process analysis of a gas film seal in counter-rotating shafts

The vibration process of a double-faced gas film seal in counter-rotating shafts was studied here. The stiffness and damping of both end faces of the seal were calculated with finite element method. The vibration process of the seal caused by transient force was analyzed. Then, the effects of the system mass and pressure on the vibration of the system was studied. The results showed that the free vibration frequency of the system is mainly dependent on the mass of the seal racetrack, and the effect of the primary seal ring mass on the free vibration frequency could be neglected; the different ratios of the system mass to the same racetrack mass has little influence on the convergent time of the vibration of the system; as the pressure raises, the force that the system can bear becomes smaller and the system is easy to be unstable. The calculation and analysis above was helpful for the dynamic response analysis of a gas film seal in counter-rotating shafts.