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根据检修后，机组运行中异常的击鼓余音现象。对检修过程中的水平、摆度异常进行分析，认为机组镜板存在凹陷并由此造成了击鼓余音声响，提出了处理方法建议。
According to the overhaul, abnormal drumming repercussions during the operation of the unit. The level and the swing anomaly in the maintenance process are analyzed, and it is considered that there is a depression in the mirror plate of the unit and the reverberant sound of the drumming sound is caused. A processing method is proposed.