The dynamic behaviour of the stall-regulated Nibe A wind turbine. Measurements and a model for stall-induced vibrations

P. Lundsager, H. Petersen, S. Frandsen

    Research output: Book/ReportReportResearch

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    Abstract

    The report is in two parts. In the first part the prerininary measurement systen used is described, and a survey of the measurements made until the end of March 1980 is given. Results are presented concerned with the measurements of tower eigenfrequencies, eigenfrequencies of the stationary rotor and the chacteristics of both flapwise and edgewise bending mornents. The findings are compared with the design assumptions, ancl the agreenent is found to be good. rn the second part the possible occurrence of stall-induced blade vibrations is investigated. Vibrations with first flapping eigenfrequency are reported and a one degree of freedom model with velocity-dependent load is presented. Calculated results are shown with agree reasonably well with measured characteristics. A possible modification of the stay systen is suggested.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages70
    ISBN (Print)87-550-0815-1
    Publication statusPublished - 1981
    SeriesRisø-M
    Number2253
    ISSN0418-6435

    Keywords

    • Risø-M-2253
    • Computer calculations
    • Dynamic loads
    • Eigenfrequency
    • Fatigue
    • Frequency response testing
    • Mechanical vibrations
    • Rotors
    • Stresses
    • Turbine blades
    • Wind turbines

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