For the abnormal vibration fault of the seawater cooling pump at the right gearbox of a ship,this pa-per measured the vibration speed and speed waveform of the pump,determined the vibration excitation source through acceleration envelope analysis,and found that the cause of the fault is the bearing damage and subsequent imbalance of pump rotor.Finally,this paper eliminated the fault by replacing the bearing.
seawater cooling pumpnatural frequencyenvelope spectrumbearing characteristic frequency
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