Accurate Rotor Loads Prediction Using the FLAP Dynamics Code

    Research output: NRELTechnical Report


    Accurately predicting wind turbine blade loads and response is very important in predicting the fatigue life of wind turbines. There is a clear need in the wind turbine co1110unity for validated and user-friendly structural dynamics codes for predicting blade loads and response. At the Solar Energy Research Institute (SERI), a Force and Loads Analysis Program (FLAP) has been refined and validatedand is 'ready for general use. Currently, FLAP is operational on an IBM-PC compatible computer and can be used to analyze both rigid- and teetering-hub configurations. The results of this paper show that FLAP can be used to accurately predict the deterministic loads for rigid-hub rotors. This paper compares analytical predictions to field test measurements for a three-bladed, upwind turbine witha rigid-hub configuration. The deterministic loads predicted by FLAP are compared with 10-min azimuth averages of blade root flapwise bending moments for different wind speeds.
    Original languageAmerican English
    Number of pages10
    StatePublished - 1987

    NREL Publication Number

    • NREL/TP-217-3223


    • flap
    • force and loads analysis program
    • rigid hub
    • rotors
    • wind energy


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