The signals of gearbox fault vibration are usually non-stationary

in order to effectively extract the characteristic parameters of failure signal

the method of signal characteristic parameter extraction based on wavelet packet denoise and nonlinear Teager energy operator is proposed.By using the constructed signal simulation

the feasibility of this method to extract the signal characteristic parameter is studied

and this method is successfully applied to the eccentric gear gearbox fault diagnosis

which demonstrate the effectiveness of this method to extract characteristic parameter of gear fault gearbox vibration signal.