Vibroimpact motion,slippage and return of the rotor on the stator

Transitional processes are investigated in the rotor-stator system when the rotor becomes abruptly unbalanced in their contact, and the rotor rotates slower or faster than its critical speed while the torque is standard for turbine characteristics. It is shown that rotor in contact can operate relatively safely within a few fractions of a second under immense dynamic load affecting both the rotor and the stator. The system processes are discussed in time, including the misbalance effect, the rotational velocity, and the recovery factor upon the critical sliding friction coefficient making the rotor run-in dangerous on the stator.