According to the shortage of zooming envelope spectrum analysis that it setting the center frequency and bandwidth of band-pass filter relying on experience.The method of gear fault diagnosis decomposition combining with EMD Hilbert and ZOOM technologies is presented.First

adaptive decomposition of gear vibration signal is carried out by EMD

by reconstitution of the useful IMF

new signal is got

by Hilbert transformation

envelope spectrum is got

then by zooming envelope spectrum analysis

the spectrum of high-resolution refinement is got. The experimental results show decomposition and adaptive filtering method is simple and convenient

and can highlight the fault characteristic frequency components more effectively.