Act as routine dispose signal estimation route to, recursion least square method possess in a position to at approximate time bring relative comparison small error.

Comparison of the bearing "s early fault and late fault vibration signal decomposed results, proves that WPT diagnosis method used in incipient rolling element bearing fault is effective."

To deal with this problem, comparison is made between the empirical mode decomposition(EMD) and the wavelet method in terms of signal trend extraction.