Rolling bearing compound fault extraction method and system

The invention discloses a rolling bearing compound fault extraction method and a rolling bearing compound fault extraction system. The rolling bearing compound fault extraction method comprises the steps of adopting an acceleration sensor to obtain a bearing fault vibration signal firstly, taking variation mode decomposition as a processing method for dimension raising and denoising of the vibration signal to obtain K IMFs, taking a resonance frequency band of a fast spectral kurtosis graph as a screening criterion of effective IMF (SIMFi), performing fast spectral kurtosis frequency spectrum filtering on the SIMFi, and diagnosing fault types contained in the original signal through comparing an envelope spectrum with a bearing fault theoretical calculation result. The rolling bearing compound fault extraction method and the rolling bearing compound fault extraction system can accurately and effectively diagnose the compound fault combination form, avoid missed diagnosis and misdiagnosis, and have significant