supported by the National Natural Science Foundation of China(Grant No.51275384);the Key Project of National Natural Science Foundation of China(Grant No.51035007);the National Basic Research Program of China(Grant No.2009CB724405);the Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20110201130001)
Vibration signal is an important prerequisite for mechanical fault detection. However, early stage defect of rotating machiner- ies is difficult to identify because their incipient energy is interfered with background...