Modal Truncation in Experimental Modal Analysis

Marius Tarpø, Michael Vigsø, Rune Brincker

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

    Abstract

    Some methods in experimental modal analysis rely on a finite set of modes and they neglect the higher modes. However, this approach causes a truncation of the modal decomposition and the modal truncation introduces errors of unknown magnitude. In this paper the effect of modal truncation is investigated on a test specimen in the laboratory. It is found that the system response is dependent of the frequency and the distribution of the load. Modal truncation can introduce significant errors if the set of mode shapes does not efficiently span the spatial distribution of the load.
    Original languageEnglish
    Title of host publicationTopics in Modal Analysis & Testing, Volume 9 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018
    EditorsMichael Mains , Brandon J. Dilworth
    Number of pages10
    PublisherSpringer
    Publication date2018
    Pages143-152
    Chapter15
    ISBN (Print)978-3-319-74699-9
    ISBN (Electronic)978-3-319-74700-2
    DOIs
    Publication statusPublished - 2018
    Event36th International Modal Analysis Conference - Orlando, United States
    Duration: 12 Feb 201815 Feb 2018
    Conference number: 36

    Conference

    Conference36th International Modal Analysis Conference
    Number36
    Country/TerritoryUnited States
    CityOrlando
    Period12/02/201815/02/2018
    SeriesConference Proceedings of the Society for Experimental Mechanics Series
    ISSN2191-5644

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