Steam turbine bearing external characteristic experiment

2020 - turbine bearing external characteristic experiment 01 - 03 author: peng beg flourishing so-called bearing external characteristic test, is through the various parts of the bearing vibration measurement and analysis of bearing seat and the bedplate, bedplate and foundation of the connection and the contact situation, determine the support stiffness of the bearing part, is an important means of analyzing axial vibration. Sure some relevant points on bearing seat, by measuring vibration, according to the measurement results are analyzed. Assume that the identified vibration measuring point as shown in figure 1, vibration measurements can generally be divided into three conditions shown in table 1. Figure 1 external characteristic experiment measuring point vibration table 1 external characteristic structure of the first case, the vibration of the bedplate of the bearing industry, basic values are equal, no vibration attenuation, this suggests that the bearing seat and bedplate, bedplate and basic links and contact is good, may be due to the disturbing force is too large, or foundation vibration can be poor, or base has caused resonance and so on. The second case, 1 and 9 measuring point vibration is very small, explain basic vibration-proof ability is good, points 1 and 2, 8 and 9 of measuring points difference between vibration is very small, bedplate and basic connection and contact normal, mainly is the points 2 and 3 different vibration is big, 25 & mu; m（ Connection and good contact difference should not exceed 5 vibration & mu; m） , suggesting that the bearing seat on the left side of the contact with the counter or connection is bad, should check whether the connecting bolt is tightened or bedplate road. the, bearing seat on the right side of point 7 and 8 big difference between vibration should also check, moreover points 6 and 7 vibration is also different, may be associated with the contact of tile. The third kind of situation can be seen from the table 8 and 9 large difference between the vibration of measuring points and up to 31 & mu; M, bedplate and connection between base or contact is not good, should check whether the anchor bolt is tightened, displacement, check if there's any loose for shim is secondary grouting oil soaked, etc. , in addition to the vibration of the measuring point 1 and 9, are bigger, but compared with the measuring point 5, vibration attenuation, there is no resonance can be thought of as basis, measuring point 1 and 9 big vibration exciting force is larger. External characteristic experiment results in addition to the table 1 by several ways, may also have other different circumstances, should according to actual circumstances, the measured data is analyzed, in terms of axial vibration, should pay attention to the bearing seat, bedplate, based the difference along the axial vibration, bearing vibration at the top of the front and back end differences should be paid attention to, because the axial vibration general with bearing at the top of the largest, the most obvious difference before and after the vibration response. （ Source: the coalification run dry quenching technology exchange learning platform)