On the Operational Modal Analysis applied to linear time periodical systems

Giuliano Coppotelli, Massimiliano Deon, Ilmar Santos

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    In this paper, an approach for the identification of the dynamic properties of linear time periodical (LTP) systems is proposed. Such a novel approach is based on an already developed operational modal analysis (OMA) method, called the Hilbert Transform Method (HTM), used to characterize linear time-independent (LTI) systems. It is shown that the approach is capable to identify both the non-periodical (basis) and the periodical (parametric) modal properties of LTP systems. Both numerical analysis and experimental investigations on a rotor-blade structure, considered as representative of a time-periodical system, are shown to assess the developed methodology in terms of accuracy and robustness of the identification. Finally, the paper reports an improvement of the HTM estimating technique aimed at increasing the accuracy of the modal parameters identification when dealing with (very) close-poles systems.
    Original languageEnglish
    Title of host publicationProceedings of AIAA Scitech 2020 Forum
    PublisherAerospace Research Central (ARC)
    Publication date2020
    Article number1905
    ISBN (Electronic)978-1-62410-595-1
    Publication statusPublished - 2020
    EventAIAA Scitech 2020 Forum - Orlando, United States
    Duration: 6 Jan 202010 Jan 2020


    ConferenceAIAA Scitech 2020 Forum
    Country/TerritoryUnited States


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