Method and system for distinguishing water resonance fault of mixed-flow water turbine

The invention relates to a mixed-flow water turbine water body resonance fault distinguishing method and system. The method comprises the steps of characteristic quantity data collection and anomaly recognition, basic parameter acquisition, inherent frequency calculation of an annular water body behind a water diversion pipeline and a guide vane, collection and calculation of abnormal vibration and pressure pulsation frequency, comparison of the inherent frequency of the annular water body behind the water diversion pipeline and the guide vane with the abnormal vibration and pressure pulsation frequency, and water body resonance fault judgment. The device is used for judging and discriminating whether abnormal pressure pulsation and vibration are caused by water body resonance or not by data analysts so as to research ways and measures for eliminating or controlling water body resonance and influences of the water body resonance. Meanwhile, the method has the advantages of being easy to operate, high in unive