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Table 3 Natural frequencies of rotor system under different cavitation conditions

From: Unsteady Flow and Structural Behaviors of Centrifugal Pump under Cavitation Conditions

Mode Non-cavitation (Hz) NPSH = 5.71 m (Hz) NPSH = 2.58 m (Hz) NPSH = 1.68 m (Hz) NPSH = 1.10 m (Hz)
1 136.79 136.48 136.41 136.35 135.84
2 156.98 156.92 156.91 156.89 156.70
3 156.99 156.93 156.91 156.90 156.71
4 779.66 779.60 779.59 779.57 779.44
5 779.84 779.78 779.77 779.75 779.62
6 1441.4 1441.4 1441.4 1441.4 1441.4