In view of the abnormal vibration fluctuation fault of the high and medium pressure rotor in the process of changing load of unit 5 in a factory,the cause analysis and diagnosis are carried out,it is pointed out that the abnormal contact stiffness of No.1 bearing is the main cause of large amplitude vibration fluctuation of high and medium pressure rotor.The problem of abnormal vibration fluctuation of high and medium pressure rotor is solved by replacing new bearing pads and dynamic balancing on site.
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