Diesel Engine Valve Fault Diagnosis Based on Pseudo Wigner-Ville Time-frequency Distribution

Diesel engine valve train is one of the most easily to breakdown parts, and its fault diagnosis researches attract a lot of attention. The researches show that, as unstable signals, only nonlinear methods can accurately analyze cylinder cap vibration signal; Pseudo Wigner- Ville distribution Time-frequency distribution could be effective methods for the fault diagnosis of diesel engine, and the windowing function makes the Wigner distribution become local, so the pseudo Wegener distribution compress the cross terms of multicomponent signal in some degree. Practice proves that, it is important to carry out diesel engine vibration diagnosis in its predictive maintenance.