Vibration of the booster motor
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Our plant has a booster unit of Shaanxi Gas Turbine B90; after replacing the motor, the vibration level during single-unit testing was 2.1 mm/s². When the units were operated together, the vibration level during testing was 8.5 mm/s². Spectral analysis of the online monitoring data showed that the first harmonic was relatively high, which indicates issues related to dynamic balancing or loose foundation bolts. The fitter redid the motor foundation, with the alignment being within 0.05 mm. The vibration values during testing remain unchanged. I would like to ask whether single testing and loading have a significant impact on dynamic balance? (The foundation is rigid, so there’s no problem.)
The imbalance changes significantly with speed, but not significantly with load.
To affect Jiaotong University, a careful examination is required.