A pedestal looseness fault diagnosis method based on NA-MEMD

Abstract

When pedestal looseness fault occurs, rotor system’s vibration signals have non-stationary modulation characteristics. And traditional resonance demodulation method is difficult to determine the filter parameters. According to the fact, a pedestal looseness fault determination strategy of rotor system by using NA-MEMD (Noise-Assisted MEMD) is proposed. We use NA-MEMD to disassemble vibration signal into several stationary components. Envelope demodulation strategy is utilized to analyze each component. The vibration signal’s fault message can be acquired through this way. The displayed strategy is utilized to analyze the simulated signal and pedestal looseness fault vibration signal. The comes about appear that the displayed strategy can successfully extricate vibration signal’s fault characteristics of pedestal looseness fault in rotating machinery.