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  • Morlet-wave-based modal identification in the time domain [Elektronski vir]
    Tomac, Ivan ; Slavič, Janko, 1978-
    This research focuses on the time-domain identification of modal parameters using impact response excitation from signals with a relatively small dynamic range and high noise contamination (e.g., ... from high-speed cameras). The information required to identify the modal parameters is limited and is contained mostly at the beginning of the signal. In order to perform an identification from such a response, the following challenges have to be overcome: a good frequency-domain separation (for close modes), a good localization in the time domain and an over-determination (to reduce uncertainty). To overcome these challenges this research introduces the Morlet-wave modal identification method as an extension of the Morlet-wave damping identification method, which has already proven capable of identifying the damping of short signals. Here, the method is extended to the modal parameters and an over-determination approach is proposed to reduce the uncertainty. The method identifies each mode shape separately from 10 to a maximum of 400 oscillations and at damping levels from 0.02% to 2% with a strong presence of noise in the signal. The method is tested on an experimental example and the results are compared to the classical modal identification methodology.
    Vir: Mechanical systems and signal processing [Elektronski vir]. - ISSN 1096-1216 (Vol. 192, Jun. 2023, str. 1-11)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 144036355

    Povezava(-e):

    https://www.sciencedirect.com/science/article/pii/S0888327023001504
    Repozitorij Univerze v Ljubljani – RUL
    DOI

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