Underwater propeller light fault diagnosis method and device

The invention relates to the technical field of fault diagnosis, and discloses an underwater propeller light fault diagnosis method and device, and the method comprises the steps: carrying out the time-frequency power spectrum calculation of an analyzed underwater propeller operation signal; converting the time-frequency power spectrum into a light fault feature of the underwater propeller; light fault features of the underwater propeller under different light fault degrees are collected to form feature sample sets, and a multistage fault recognition function is constructed according to the feature sample sets of different light fault degrees; and inputting the calculated light fault features of the underwater propeller into the constructed multi-stage fault recognition function to obtain a light fault diagnosis result. According to the underwater propeller light fault diagnosis method, the time-frequency power spectrum is extracted based on the signal time-frequency information, the characteristics effective