The turbine friction vibration cause during the period of start-up and in the early time of commercial service in Lingao nuclear power station is analyzed,and the adopted measures to solve the problem are introduced.

Materials present plastic deformation under cyclical loading because of the influence of vibration friction,and the resilience vs the displacement show the hysteresis trait in a vibration compaction system.

In order to decrease the harmfulness caused by said impact-rubbing to the equipments, the characteristics of impact-rubbing vibration, diagnosis method, and corresponding dispasal scheme have been expounded in detail.

It is believed from analysis that the vibration is mainly a rubbing vibration at the position of bearing no.

The effect of unbalance distribution on a large rotor s frictional vibration behavior has been studied.

Basing this idea,the paper derives the kinematic equations of driven mechanism during the startup motion and gets the critical conditions of the frictional vibration and the frictional mechanism.