A Novel Multidimensional Frequency Band Energy Ratio Analysis Method for the Pressure Fluctuation of Francis Turbine

Table 1

Different frequency bands energy ratio and the amplitude of pressure fluctuation.

Load/MW	High frequency band/%	Medium frequency band/%	Low frequency band/%	Amplitude/kPa
00	0.98	0.01	0.01	8.0
20	0.86	0.00	0.14	6.0
40	0.81	0.00	0.19	11.0
60	0.21	0.04	0.75	33.0
80	0.03	0.03	0.94	130.0
100	0.00	0.00	1.00	230.0
120	0.02	0.03	0.96	89.0
140	0.07	0.39	0.54	42.0
160	0.29	0.00	0.71	29.0
180	0.67	0.01	0.32	13.0
200	0.86	0.00	0.14	10.0