A robust instantaneous frequency estimation of rotating machinery

The problem of estimating and tracking the fundamental frequency of a periodic signal is formulated in short Fourier transform and viterbi algorithm (STFT_VA) is proposed. An improvement to peak search is proposed, which can avoid strong non-order components or noises disturbing to the peak search work. Compare with traditional methods of order tracking instantaneous frequency estimation (IFE) based on order tracking is simplified in application an only software depended. The method is tested on a multichannel vibration measurement from the rotating machinery .From the measurements the running speed of the engine is successfully estimated during the run-up/down experiment.