Aiming at the limitations of traditional demodulation methods for extracting the fault feature of rolling bearing vibration signal

combining iterated Hilbert transform (IHT) with resonance demodulation technique

a new method about rolling bearing fault diagnosis was proposed.Firstly

the original vibration signal was decomposed into some component signals of envelope amplitude by iterated Hilbert transform

which contain fault characteristics;then

the high frequency interference noise was eliminated and frequency multiplication spectrum was obtained by resonance demodulation technique;finally

fault type was determined by contrast with theoretical fault frequency.The experimental results show that the approach can be applied to the roller bearings fault diagnosis effectively.