NDLI: Prediction of Stochastic Blade Responses Using Measured Wind-Speed Data as Input to the Flap Code

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wright, A. D. Thresher, R. W.
Copyright Year	1990
Abstract	Accurately predicting wind turbine blade loads and response is important in predicting the fatigue life of wind turbines. The necessity of including turbulent wind effects in structural dynamics models has long been recognized. At SERI, the structural dynamics model, or FLAP (Force and Loads Analysis Program), is being modified to include turbulent wind fluctuations in predicting rotor blade forces and moments. The objective of this paper is to show FLAP code predictions compared to measured blade loads using actual anemometer array data and a curve-fitting routine to form series expansion coefficients as the turbulence input to FLAP. The predictions are performed for a three-bladed upwind field test turbine. An array of nine anemometers was located 0.8 rotor diameters (D) upwind of the turbine, and data from each anemometer are used in a least-squares curve-fitting routine to obtain a series expansion of the turbulence field over the rotor disk. Three 10-min data cases are used to compare FLAP predictions to measured results. Each case represents a different mean wind speed and turbulence intensity. The time series of coefficients in the expansion of the turbulent velocity field are input to the FLAP code. Time series of predicted flap-bending moments at two blade radial stations are obtained, and power spectra of the predictions are then compared to power spectra of the measured blade bending moments. Conclusions are then drawn about the FLAP code’s ability to predict the blade loads for these three data cases. Recommendations for future work are also made.
Starting Page	326
Ending Page	332
Page Count	7
File Format	PDF
ISSN	01996231
e-ISSN	15288986
Journal	Journal of Solar Energy Engineering
Volume Number	112
Issue Number	4
DOI	10.1115/1.2929943
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	1990-11-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Blades Disks Fatigue life Fittings Fluctuations (Physics) Force Rotors Spectra (Spectroscopy) Stress Structural dynamics Time series Turbines Turbulence Wind Wind turbines Wind velocity
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment Energy Engineering and Power Technology

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