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Browsing by Subject "wavelet analysis"

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  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Analiza falkowa w zastosowaniach badań deformacji sygnału mowy
    (Data obrony: 2017-10-13) Kądziela, Agnieszka
    Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Pomiar pulsu człowieka na podstawie analizy sygnału akustycznego z wykorzystaniem techniki uczenia maszynowego
    (Data obrony: 2019-01-21) Morawiecki, Krzysztof
    Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Time-variant frequency response function for analysis of time-varying mechanical systems
    (Wydawnictwa AGH, 2015) Dziedziech, Kajetan
    System Identification is an important and often complex process in many areas of engineering. This process is not easy when the parameters of the analyzed system vary with time. In such cases, classical methods fail to properly identify the parameters. The work demonstrated in this paper deals with the identification of natural frequencies in time-variant systems. The paper presents the application of the Time-Variant Frequency Response Function for this analysis. The calculation procedure requires division of the output spectrum by the input spectrum, which often leads to division by close-to-zero values, this leads to infinite (or undefined) values of the resulting transfer function. Additional processing is required for interpretation. The major focus and challenge relate to the ridge extraction of the above time-frequency characteristics. The methods presented in the paper are illustrated using an experimental multi-degree-of-freedom system. The results show that the proposed method correctly captures the dynamics of the analyzed time-variant systems.