Under time-varying operating conditions, the instantaneous frequency (IF) of the vibration
signal of the planetary gearbox exhibits non-stationary time-varying closely spaced …

The instantaneous angular speed (IAS) as a key variable represents the running state of
rolling bearings. The combination of IAS and various technologies can improve the accuracy …

Extraction of repetitive shock signals from vibration signals is crucial in bearing fault
detection. Morphological filtering can extract the signal components based on the geometric …

Time-frequency analysis (TFA) has been applied as an important technique for
nonstationary signal processing. However, the strong frequency modulation signals caused …

Time-frequency analysis (TFA) is one of the useful signal processing methods for describing
the nonstationary characteristics of signals with crossover frequencies, which exist in many …