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RESEARCH PAPERS

Frequency Domain Analysis of the Fatigue Loads on Typical Wind Turbine Blades

[+] Author and Article Information
H. J. Sutherland

Wind Energy Technology, Sandia National Laboratories, Albuquerque, NM 87107

J. Sol. Energy Eng 118(4), 204-211 (Nov 01, 1996) (8 pages) doi:10.1115/1.2871779 History: Received January 01, 1995; Revised November 01, 1995; Online February 14, 2008

Abstract

The fatigue analysis of a wind turbine blade typically depends on converting time-series data to a series of load cycles using one of several cyclic counting algorithms. However, many structural analysis techniques yield frequency-domain stress spectra, and a large body of experimental loads (stress) data is reported in the frequency domain. To permit the fatigue analysis of this class of data, a series of computational algorithms based on Fourier analysis techniques has been developed. The principle underlying these algorithms is the use of an Inverse Fast Fourier Transform (FFT) to transform the frequency spectrum to an equivalent time series suitable for cycle counting. In addition to analyzing the fatigue loads along the primary blade axes, this analysis technique also permits the examination of “off-axis” bending loads. These algorithms, which have been incorporated in the LIFE2 fatigue analysis code for wind turbines, are illustrated and evaluated with data from typical wind turbine blades.

Copyright © 1996 by The American Society of Mechanical Engineers
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