Energy operator demodulating approach based on LMD and its application in extracting characteristics of a fault signal

Local mean decomposition(LMD) is an effective time-frequency for decomposing a multi-component AM-FM signal into a number of mono-component AM-FM signals.An energy operator demodulating approach based on LMD was proposed for extracting characteristics of a faulty signal.LMD was used to decompose a complex multi-component AM-FM signal into a linear combination of a finite number of production functions(PF),then the energy operator demodulation was applied to extract amplitudes and frequencies of each PF so as to obtain the time-frequency distribution of the faulty signal and extract the fault characteristics.In order to improve the analysis precision,a data extension method based on trend character of sine function was proposed to overcome end effects.The application results showed that the proposed energy operator demodulating approach based on LMD can extract characteristics of mechanical fault vibration signals effectively.