Analysis of Vibration Problems Caused by Insufficient Joint Stiffness ofBearing Block of Steam Turbine Generator Set

Taking a steam turbine generator set as an example, analyze the reasons forthe large vibration of the bearing block. According to the test results of external vibrationcharacteristics and the wave diagram of shaft vibration, it was judged that the reasons werethe bad contact between the bearing block foundation and the platform, the platform andthe bearing base, and the insufficient connection stiffness. The vibration of the bearing seatreached the qualified level after reinstalling the pad iron, increasing the number of padiron, relapping the table plate and replacing the pad.