Prediction of stochastic blade responses using measured wind-speed data as input to the FLAP code
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 model 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-blade 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. 9 refs., 12 figs., 4 tabs.
- Research Organization:
- Solar Energy Research Inst., Golden, CO (USA)
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 6572562
- Report Number(s):
- SERI/TP-217-3394; CONF-890102-12; ON: DE89000834
- Resource Relation:
- Journal Volume: 112; Journal Issue: 4; Conference: ASME energy-sources technology conference and exhibition and 7. intersociety cryogenic symposium, Houston, TX, USA, 22 Jan 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Prediction of stochastic blade loads for three-bladed, rigid-hub rotors
Accurate rotor loads prediction using the FLAP (Force and Loads Analysis Program) dynamics code
Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
STOCHASTIC PROCESSES
FLOW MODELS
TURBINE BLADES
RESPONSE FUNCTIONS
F CODES
NUMERICAL DATA
TURBULENCE
VELOCITY
WIND LOADS
WIND TURBINES
COMPUTER CODES
DATA
DYNAMIC LOADS
FUNCTIONS
INFORMATION
MACHINERY
MATHEMATICAL MODELS
TURBINES
TURBOMACHINERY
FORCE AND LOADS ANALYSIS PROGRAM
HOWDEN 330-KW
170602* - Wind Energy Engineering- Turbine Design & Operation
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)