After the historical data of the unit vibration, the adjustment of the shafting in the overhaul, the repair of several pieces of cemented carbide and the unweighted and the relevant operating parameters during the start of the low-pressure rotor, the static and static rubbing and the rotor are not eliminated. In the case of balance, etc., it is considered that there may be some serious faults in the unit shafting system or the supporting system, so that the stiffness is lowered, the resonance speed is closer to the working speed, and the vibration response under the exciting force is increased. Insufficient tightening of the low-input wheel-connected short-axis bolts may be the main cause of this abnormal vibration. The shutdown inspection found that the short-axis steam side connecting bolts had 11 insufficient tightening forces, and the tightening range was 15-35 degrees. There was no problem with the short-axis power generation side connection, and the short-axis swing and end face deviation were within the acceptable range. After the treatment, the abnormal vibration is removed again, and the bearing bush and the shaft vibration reach an excellent level. The other time is the use of a torque wrench in the overhaul of a power plant unit due to insufficient tightening force of the bolt. There is a big difference between the 4th and 4th wattage vibration and the shaft speed of the shaft vibration before and after the abnormal vibration. The main reason is that the 4th wattage vibration and the shaft vibration increase sharply with the increase of the rotating speed after the unit speed is greater than 2700r/min. In addition to the change in the dynamic stiffness of bearing No. 4, the reason for the increase in the vibration of No. 4 bearing may be that there is a new imbalance in the shafting, which results in a large exciting force, or a connection between the steaming and the steaming. The short shaft bolt has insufficient tightening force or uneven tension.
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