The broken-blade propeller induced centrifugal force and hydrodynamic lateral component force will cause the whirling vibration of the shaft system while one of the propeller blades breaks at different positions. Such whirling vibration is investigated in this paper, and the time domain waveform is obtained through using the finite element method. The vibration time domain waveform signal is then transformed into the shaft center orbit diagram. According to the orbit diagram, the shaft center orbit diagnosis technology of broken-blade propeller induced shaft vibration fault is proposed.
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