A fast lock-in infrared thermography implementation to detect defects in composite structures like wind turbine blades

2013 ◽  
Author(s):  
Arun Manohar ◽  
Francesco Lanza di Scalea
Keyword(s):  
Wind Turbine ◽  
Infrared Thermography ◽  
Composite Structures ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Lock In

Guided wave–based approach for ice detection on wind turbine blades

2018 ◽  
Vol 42 (5) ◽  
pp. 483-495 ◽  
Author(s):  
Siavash Shoja ◽  
Viktor Berbyuk ◽  
Anders Boström
Keyword(s):  
Experimental Data ◽  
Wind Turbine ◽  
Composite Structures ◽  
Detection System ◽  
Turbine Blades ◽  
Guided Wave ◽  
Cold Climate ◽  
Wind Turbine Blades ◽  
Time Frequency ◽  
Ice Detection

An efficient ice detection system is an important tool to optimize the de-icing processes in wind turbines operating in cold climate regions. The aim of this work is to study the application of guided wave for ice detection on wind turbine blades. Computational model is developed to simulate guided wave propagation on composite structures. The model has been validated with experimental data obtained in cold climate laboratory. Effect of ice accretion on composite structures is studied in the time, frequency and wavenumber domains. In each case, post-processing algorithms as well as icing index are introduced which are sensitive to accumulated ice on the composite structure. The algorithms and icing index are applied to both simulation results and experimental data. Analysis of the obtained results has shown that the guided wave–based approach can be used for developing ice detection systems for wind turbine blades.

Autonomous infrared thermography based inspection of glass-reinforced plastic (GRP) wind turbine blades (WTBS)

2009 ◽  
Author(s):  
C. Schizas ◽  
P. Chatzakos ◽  
A. Lagonikas ◽  
D. Korres ◽  
N. Avdelidis ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Infrared Thermography ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Reinforced Plastic

Strength of Shear Web With Circular Hole in Wind Turbine Blades and Using Digital Twining Concept to Reduce Material Testing

2017 ◽  
Author(s):  
Anil K. Sahoo ◽  
Utsa Majumder ◽  
Michael W. Nielsen ◽  
Jesper H. Garm
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wind Turbine ◽  
Composite Structures ◽  
Turbine Blades ◽  
Research Work ◽  
Element Model ◽  
Failure Behavior ◽  
Wind Turbine Blades ◽  
The Finite Element Model

This research work summarizes the study of the structural analysis of shear webs (present in wind turbine blades, sometimes also called as spars) with holes. The webs are sandwich composite structures which are supposed to carry the shear loads coming from the wind pressure and the holes are necessary for non-structural requirements of the wind turbine. The shear webs are strong structures and it is tough to test them to failure in the lab. Hence a structural representative component with lesser dimensions has been tested in the lab to accommodate the capability of the test machines. However, this component test results cannot be directly used in the wind turbine blade structural verification as the web size is much larger in real life. A finite element model is developed to simulate the test specimen and its failure behavior. The concept in this modelling approach is to prepare a digital copy of the actual specimen which will follow the same load-displacement behavior and can predict the same failure as seen in the test coupon. The finite element model is verified for failure using known failure criteria for composite sandwich structures as well as with analytical calculations. This makes sure that the finite element model is a good ‘digital twin’ and simulates the test component behavior one to one. Later, this finite element model is extended to the size of the actual web structure (a family of FE models with different dimensions) to scale up the failure prediction to actual stiffness level.

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