The Effect of Load Phase Angle on Wind Turbine Blade Fatigue Damage

[+] Author and Article Information
Darris L. White, Walt D. Musial

National Renewable Energy Laboratory, Golden, CO 80401

J. Sol. Energy Eng 126(4), 1050-1059 (Nov 18, 2004) (10 pages) doi:10.1115/1.1800533 History: Received June 20, 2004; Revised June 22, 2004; Online November 18, 2004
Copyright © 2004 by ASME
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Comparison of damage accumulation defect at node 45 (15.75 m)—variable phase angle vs constant phase angle
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Effect of the number of sequence repetitions on damage accumulation
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Normalized accumulated damage for fatigue tests with variable phase angles to constant 72 deg phase angle
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Comparison of one phase angle sequence to ten phase angle sequences
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Example phase angle calculations
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Phase angles distribution for 9 m/s mean wind speed—1.5 MW turbine—IEC Class Ia site
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Mean phase angle as a function of average wind speed
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PDF for phase angle and wind speed for generic 1.5 MW blade
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Aggregate phase angle probability density function for generic 1.5 MW blade
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Effect of load phase angle on damage accumulation (15.75 m)
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Phase angle time history for generic 1.5 MW blade
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Strain-cycle properties for fiberglass spar cap and skin material (see Ref. 8)
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Effect of load phase angle on equivalent alternating strain (15.75 m)
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Accumulated damage for three different load phase angles (15.75 m)
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Variable phase angles (15.75 m)
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Material defect locations




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