Rolling ball bearing outer ring spalling fault double-impact feature extraction method and rolling ball bearing outer ring spalling fault double-impact feature extraction system

The present invention relates to a rolling ball bearing outer ring spalling fault double-impact feature extraction method and a rolling ball bearing outer ring spalling fault double-impact feature extraction system, and belongs to the fault diagnosis technology and signal processing analysis technology field. The system of the present invention comprises a signal acquisition module, a signal processing module, a signal de-noising module and a feature extraction module. According to the present invention, during the process of extracting a rolling ball bearing outer ring spalling fault double-impact feature, an AR model is used to carry out the pre-whitening processing on an original vibration signal, and then the adaptive time frequency decomposition is carried out according to the local time-varying feature of the signal, so that the double-impact feature of the original more complicated signal is easy and effective to extract, and the foundation is laid for measuring the length of a rolling ball bearing outer ring spalling fault spalling area under an operation working condition.