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Resonance Test System

National Renewable Energy Laboratory

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Technology Marketing Summary

As wind generation technology improves, there is a trend for generation systems to become increasingly larger, whereby larger turbine blades are subjected to greater static and dynamic loads. As a result, it’s very important to test in advance a new blade design for fatigue resistance and ensure that it will be capable of withstanding expected loads without structural failure.


The National Renewable Energy Laboratory has created an apparatus for the safe testing of wind turbine blade specimens through the application of reciprocal and vibrational structural loads at various frequencies. The apparatus can apply substantial deflections in the bending or flap directions with relatively low energy input and does not induce unwanted axial loads in the blade. This apparatus can be used to test any of a wide range of blade specimen sizes and shapes.

  • Safe and versatile testing application capability for wind turbine blade technology
Applications and Industries
  • Wind Generation Manufacturing
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Patent 7,953,561
Resonance test system
An apparatus (10) for applying at least one load to a specimen (12) according to one embodiment of the invention may comprise a mass (18). An actuator (20) mounted to the specimen (12) and operatively associated with the mass (18) moves the mass (18) along a linear displacement path (22) that is perpendicular to a longitudinal axis of the specimen (12). A control system (26) operatively associated with the actuator (20) operates the actuator (20) to reciprocate the mass (18) along the linear displacement path (22) at a reciprocating frequency, the reciprocating frequency being about equal to a resonance frequency of the specimen (12) in a test configuration.
National Renewable Energy Laboratory 05/31/2011
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
ROI 01-51DevelopmentAvailable12/31/201812/31/2018

Contact NREL About This Technology

To: Erin Beaumont<>