For the rotor with seals, when the rotor is running at high speed, some characteristics of the seal will affect the stability of the rotor operation and the safe operation of the unit. On the contrary, the vibration of the rotor will also affect the sealing performance of the seal. Therefore, based on the interaction between the rotor and the contact seal, an equivalent dynamic model is established to analyze the dynamic characteristics of the rotor system with seals.

The reason why the contact seal can play a sealing role is that the contact between the seal and the rotor enables the sealing function to be realized, as shown in the figure is the force diagram of the rotor.

When the rotor is running, on the one hand, the radial vibration of the rotor changes the force on the sealing plate, which makes the displacement of the seal change in the radial direction, which will have a certain impact on the sealing performance of the seal.

On the other hand, due to the rigidity of the seal, the radial vibration of the rotor is simulated. The interaction between the two determines the dynamic characteristics of the rotor and the sealing performance of the seal.