2011/04/13 by Hau‐Tieng Wu, Wu, Hau-tieng · 4 citations
Engineering · #FOS: Mathematics #Machine Fault Diagnosis Techniques #Numerical Analysis (math.NA) #Power Quality and Harmonics #Statistics Theory (math.ST) #Structural Health Monitoring Techniques
paper · pdf · doi:10.48550/arxiv.1104.2365
openalex publication_date 2011/04/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Although one can formulate an intuitive notion of instantaneous frequency, generalizing "frequency" as we understand it in e.g. the Fourier transform, a rigorous mathematical definition is lacking. In this paper, we consider a class of functions composed of waveforms that repeat nearly periodically, and for which the instantaneous frequency can be given a rigorous meaning. We show that Synchrosqueezing can be used to determine the instantaneous frequency of functions in this class, even if the waveform is not harmonic, thus generalizing earlier results for cosine wave functions. We also provide real-life examples and discuss the advantages, for these examples, of considering such non-harmonic waveforms.