The field test and calculation analysis for unstable vibration of 320MW turbomachinery rotor-bearing systems

摘要

Unstable vibration of rotor-bearing systems often occurs on large turbomachineries, which affects the normal operation and the equipment safety. However, the diagnosis for this defect is sometimes difficult in the field. This paper presents some examples of this unstable vibration concerning 320MW units, and introduces the field test procedure and calculation analysis for investigating the instability characteristics and detecting the causes of this fault. The results show that this vibration is induced by steam flow, and the causes of the fault is the improper construction design, operational parameters and others. This paper can be a reference to diagnose similar defects on large turbomachineries and troubleshooting.