Hydroelectric generating set sound feature extraction method

The invention discloses a hydroelectric generating set sound feature extraction method, which comprises the following steps: carrying out fine processing on sound signals of a hydropower station tail water inlet gate by adopting a multi-scale decomposition and logarithmic energy operator analysis technology, decomposing non-stationary sound signals under four different working conditions by adopting the multi-scale decomposition technology, and extracting the sound features of the hydropower station tail water inlet gate. And further analyzing the obtained stable component by using a logarithmic energy operator, thereby effectively revealing the energy distribution rule of the sound signal on a plurality of frequency domain scales. By performing logarithmic energy operator analysis on the multi-scale component of the tailrace entrance door sound signal, the running condition of the hydroelectric generating set can be monitored, and the sound abnormally emitted by the hydroelectric generating set can be timely