What is the Shaft Vibration Standard?

The vibration of the bearing seat cannot fully reflect the vibration of the rotating shaft in the bearing pad (shaft vibration). The ratio of bearing vibration to shaft vibration is related to the stiffness of the bearing support. When the excitation force is constant, the greater the support stiffness, the smaller the vibration of the bearing seat, and the shaft vibration Even in the case of small bearing vibration, there may still be large current vibration in the rotating shaft. Excessive vibration of the shaft may cause fatigue damage to the black metal of the bearing, and cause collision and wear of dynamic and static components. The vibration evaluation standard should be Fully consider various factors. In order to make up for the deficiency that the bearing vibration cannot fully reflect the shaft vibration, the shaft vibration should be taken as the scale of the vibration state evaluation standard of the large rotating machinery unit.

There are two measurement methods for shaft vibration: current vibration and absolute vibration. Table 1-1 and Table 1-2 show iso7919-2 (Measurement of Radial Vibration of Rotary Shaft of Large Turbine Generator Set Installed on Land) formulated by the International Organization for Standardization and evaluation standards). The revised standard is applicable to large turbogenerators installed on land with a power greater than 50MW and a rated speed range of 1500-3600r\/min.

Note: cz600 type eddy current displacement sensor can be used to measure

Table 1-2 Recommended values ​​of absolute shaft vibration displacement (peak-to-peak) for large turbogenerator sets