Determining Equivalent Damage Loading for Full-Scale Wind Turbine Blade Fatigue Tests

Research output: Contribution to conferencePaper


Complete Descriptive Abstract: This paper describes a simplified method for converting wind turbine rotor design loads into equivalent-damage, constant-amplitude loads and load ratios for both flap and lead-lag directions. It is an iterative method that was developed at the National Renewable Energy Laboratory (NREL) using Palmgren-Miner's linear damage principles. The general method is uniquebecause it does not presume that any information about the materials or blade structural properties is precisely known. According to this method, the loads are never converted to stresses. Instead, a family of M-N curves (moment vs. cycles) is defined with reasonable boundaries for load-amplitude and slope. An optimization program iterates and converges on the constant amplitude test load andload ratio that minimizes the sensitivity to the range of M-N curves for each blade section. ; We constrained the general method to match the NedWind 25 design condition for the Standards, Measurements, and Testing (SMT) blade testing program. SMT participants agreed to use the fixed S-N slope of m = 10 from the original design to produce consistent test-loads among the laboratories.Unconstrained, the general method suggests that slightly higher test loads should be used for the NedWind 25 blade design spectrum. NedWind 25 blade test loads were computed for lead-lag and flap under single-axis and two-axis loading.
Original languageAmerican English
Number of pages12
StatePublished - 2000
Event19th ASME Annual Meeting - Reno, Nevada
Duration: 10 Jan 200013 Jan 2000


Conference19th ASME Annual Meeting
CityReno, Nevada

NREL Publication Number

  • NREL/CP-500-27510


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