本机稳定振动后，方可带料运行；
轴系非稳定振动是超临界机组的一种重要的振动故障。
It is concluded that, the property of non-steady vibration of such kind unit is of steam-excited vibration.
通过对某机组运行中发生的不稳定振动进行分析，结合现场数据，诊断出了振动故障。
The vibration malfunction was diagnosed through the analysis of unstable vibration in the operation of a unit and the field data.
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