Different wind parameters are studied to find a set that is most useful in estimating fatigue loads on wind turbine blades. The histograms of rainflow counted stress ranges are summarized through their first three statistical moments and regression analysis is used to estimate these moments in various wind conditions. A systematic method of comparing the ability of different wind parameters to estimate the moments is described and results are shown for flapwise loads on three HAWTs. In the case of two of these turbines, the stress ranges are shown to be highly correlated with a turbulence measure obtained by removing a portion of the low-frequency content of the wind.

Barnard, J. C., and Wendell, L. L., “A Simple Method of Estimating Wind Turbine Blade Fatigue at Potential Wind Turbine Sites,” ASME JOURNAL OF SOLAR ENERGY ENGINEERING, Vol. 119, No. 1, 1997.
Connell, J. R., Morris, V. R., Powell, D. C., and Glower, G. L., “The PNL Single-Tower Measurement Model of Rotationally Sampled Turbulent Wind, with User’s Guide for STRS2PC,” PNL-6580, Pacilic Northwest Laboratories, Richland, WA, 1988.
Jackson, K. L., “Deriving Fatigue Design Loads from Field Test Data,” WindPower ’92, AWEA, 1992.
Jha, A. K., and Winterstein, S. R., “CYCLES 2.0: Fatigue Reliability Models and Results for Wave and Wind Applications,” RMS Report 27, Reliability of Marine Structures Program, Civil Eng. Dept., Stanford University, 1997.
Kashef, T., and Winterstein, S. R., “Estimating Wind Turbine Blade Loads from Environmental Parameters,” to be published: SNL Report, Sandia National Laboratories, Albuquerque, NM, 1997.
Kelley, N. D., “A Comparison of Measured Wind Park Load Histories with the WISPER and WISPERX Load Spectra,” Wind Energy 1995, ASME, SED Vol. 16, 1995.
Kelley, N. D., “The Identification of Inflow Fluid Dynamics Parameters that can be used to Scale Fatigue Loading Spectra of Wind Turbine Structural Components,” NREL/TP-442-6008, National Renewable Energy Laboratory, Golden, CO, Nov.1993.
Lange, C. H., and Winterstein, S. R., “Fatigue Design of Wind Turbine Blades: Load and Resistance Factors from Limited Data,” Energy Week—Wind Energy Symposium, ASME, SED Vol. 17, 1996.
Madsen, P. H., Pierce, K., and Buhl, M., “Predicting Ultimate Loads for Wind Turbine Design,” 1999 ASME Wind Energy Symposium, AIAA, 1999.
Rice, J. A., Mathematical Statistics and Data Analysis, Second edition, Duxbury Press, 1995.
Veers, P. S., “Blade Fatigue Life Assessment with Application to VAWTs,” ASME JOURNAL OF SOLAR ENGINEERING, ASME, Vol. 104, No. 2, May 1982.
Veers, P. S., and Winterstein, S. R., “Application of Measured Loads to Wind Turbine Fatigue and Reliability Analysis,” 1997 ASME Wind Energy Symposium, AIAA, 1997.
Winterstein, S. R., and Lange, C. H., “Load Models for Fatigue Reliability from Limited Data,” Wind Energy 1995, ASME, SED Vol. 16, 1995.
This content is only available via PDF.
You do not currently have access to this content.