Applicability Limits of Operational Modal Analysis to Operational Wind Turbines

D. Tcherniak, Shashank Chauhan, Morten Hartvig Hansen

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


    Operational Modal Analysis (OMA) is one of the branches of experimental modal analysis which allows extracting
    modal parameters based on measuring only the responses of a structure under ambient or operational excitation
    which is not needed to be measured. This makes OMA extremely attractive to modal analysis of big structures
    such as wind turbines where providing measured excitation force is an extremely difficult task.
    One of the main OMA assumption concerning the excitation is that it is distributed randomly both temporally and
    spatially. Obviously, closer the real excitation is to the assumed one, better modal parameter estimation one can
    expect. Traditionally, wind excitation is considered as a perfect excitation obeying the OMA assumptions.
    However, the present study shows that the aeroelastic phenomena due to rotor rotation dramatically changes the
    character of aerodynamic excitation and sets limitations on the applicability of OMA to operational wind turbines.
    The main purpose of the study is to warn the experimentalists about these limitations and discuss possible ways
    of dealing with them.
    Original languageEnglish
    Title of host publicationStructural Dynamics and Renewable Energy
    PublisherSociety for Experimental Mechanics
    Publication date2011
    ISBN (Print)978-1-4419-9715-9
    Publication statusPublished - 2011
    Event28th International Modal Analysis Conference - Jacksonville, United States
    Duration: 1 Feb 20104 Feb 2010
    Conference number: 28


    Conference28th International Modal Analysis Conference
    Country/TerritoryUnited States
    SeriesConference Proceedings of the Society for Experimental Mechanics Series


    • Aeroelastic design methods
    • Wind Energy


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