NON-STATIONARY ENVELOPE EXTRACTION OF AMBIENT VIBRATION SIGNALS BASED ON HILBERT TRANSFORM

摘要

Hie traditional Fourier analysis can extract the envelope from amplitude modulated signals, but it does not work with non-stationary signal. A new method based on Hilbert Transform is presented to extract the envelope from non-stationary amplitude modulated signal in the multiplicative composition where the non-stationary signal can be separated into the non-stationary slowly-varying component and fast component. Numerical examples are given to illustrate the efficiency of the presented method.