Full-scale fatigue tests of CX-100 wind turbine blades. Part II: analysis

摘要: This paper presents the initial analysis results of several structural health monitoring (SHM) methods applied to two 9- meter CX-100 wind turbine blades subjected fatigue loading at National Renewable Energy Laboratory's (NREL) National Wind Technology Center (NWTC). The first blade was a pristine blade, manufactured standard CX-100 design specifications. second for University Massachusetts, Lowell (UMass), with intentional simulated defects within fabric layup. Each instrumented with variety sensors on its surface. were subject harmonic excitation their natural frequency steadily increasing loading until ultimately reaching failure. Data from collected between and during sessions. The data measured multi-scale ranges using data acquisition equipment, including off-the-shelf systems prototype hardware. analyzed identify damage initiation to assess progression. Modal response, diffuse wave-field transfer functions in time domains, and wave propagation assess condition blade. implemented were evaluated conjunction hardware-specific performance efficacy enabling assessment of damage progression this will inform selection specific be collected and implemented flight test conducted collaboration Sandia National Laboratory U.S. Department Agriculture's (USDA) Conservation Production Research Laboratory (CPRL) in Bushland, Texas.