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Wind Turbine Blade Fatigue Testing

Wind turbine blade fatigue testing involves the automated cyclic loading of blades typically at resonant frequency and under closed-loop control, as a means of exciting the blade and achieving the desired strain rate. Cyclic loads are applied to blades at resonant frequency for flap-wise (typically 0.5 Hz to 2.0 Hz) or edge-wise (typically 2.0 Hz to 5.0 Hz) evaluations. This constant-amplitude fatigue testing can be used to validate blade models, characterize design durability, confirm load profiles and track early failures, cracks and changes in properties. In some cases, testing at frequencies above and below the resonant frequency may be performed with the loads applied using a structural loading actuator fixed to the earth.

MTS offers unmatched technology and expertise for helping you conduct accurate wind turbine blade fatigue tests. MTS fatigue testing solutions employ compact, energy-efficient UREX (Universal Resonant Excitation) systems, capable of precisely applying flap-wise and edge-wise resonant-frequency cyclic loads. Other key wind turbine blade fatigue testing capabilities include:

Advanced blade resonance and tracking software
Digital controllers with high channel density, high capacity, and superior configurability
Clean, quiet and highly reliable hydraulic power units
Facilities planning
FlexTest, controller, digital, servohydraulic testing, materials, components, structures

FlexTest Controllers

A versatile, modular digital control platform designed to address a full spectrum of servohydraulic testing applications in materials, components and structures.