Rolling bearing is one of the most fragile parts in rotating machinery.Rotating machinery faults are closed related to the malfunction of bearings,which will influence the stability of the whole machine.Therefore,it is important that we detect the existence of faults and diagnose features of different faults.The method applied in this paper is based on the Empirical Mode Decomposition(EMD),the first step in Hilbert-Huang Transform,to decompose fault signal into the sum of Intrinsic Mode Functions(IMF).The I...