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Peyman Poozesh, Javad Baqersad and Christopher Niezrecki Structural Dynamics and Acoustic Systems LaboratoryUniversity of Massachusetts Lowell Department ofE-mail: [email protected] Harvey and Rahul Yarala Wind technology Testing Center (WTTC)Charlestown, MA 02129
Full Field Inspection of a Utility Scale Wind turbine Blade Using 3D Digital Image
Correlation
Structural Dynamics and Acoustic Systems Laboratory2
Objectives of the Test (Quasi-Static Test)
X Distance (mm)
X Distance (mm)
y Distance (mm)
X Distance
(mm)
y Distance (mm)
X Distance (mm)
Strain
Displacement
Point APoint B
Point C
Structural Dynamics and Acoustic Systems Laboratory3
Geometry of the Measured Surface
X distance (mm)
Y di
stan
ce (m
m)
• CAD data integration DIC can provide an import interface
for CAD data which are used for 3D coordinate transformations and 3D shape deviation calculations.
Structural Dynamics and Acoustic Systems Laboratory4
Blade Static Test
o Applies tightly controlled static loading to blades for performing stiffness and strength tests required for FEM model validation and/or certification to International Electrotechnical Commission (IEC) Technical Specification 61400-23.
o Integrates robust hydraulic winch and/or linear actuation systems to achieve coordinated loading at multiple pull points on blade
https://www.mts.com
Structural Dynamics and Acoustic Systems Laboratory5
Full Field Displacement
Structural Dynamics and Acoustic Systems Laboratory6
Strain Distribution in X-Direction
Structural Dynamics and Acoustic Systems Laboratory7
Blade Fatigue test
» Blade Fatigue Test Solutions - Ground Resonance Excitation (GREX) System
Applies automated cyclic loading to blades at resonant frequency for meeting the fatigue testing demands of International Electrotechnical Commission (IEC) Technical Specification 61400-23.
Performs both flap-wise and edge-wise fatigue testing; requires change in blade orientation on reaction mass.
Grex SystemHydraulic System
Reaction Block
Structural Dynamics and Acoustic Systems Laboratory8
Displacement in Z-Direction (Fatigue Test)
Structural Dynamics and Acoustic Systems Laboratory9
Strain in Y-Direction
(Video Link)
Structural Dynamics and Acoustic Systems Laboratory10
Conclusion
The effectiveness of three-dimensional digital image correlation was demonstrated.
A stereovision camera system in conjunction with 3D DIC method
was used to monitor a large area on a utility-scale composite wind turbine blade during static and fatigue testing.
