Investigation of waviness in wind turbine blades: Structural health monitoring

Date
2012-07-01
Authors
Chakrapani, Sunil
Dayal, Vinay
Barnard, Daniel
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Altmetrics
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Abstract

Waviness in composite wind turbine blades was detected and characterized with the help of air coupled ultrasonics. Based on the aspect ratio, the detected marcels are either accepted or rejected. A passive structural health monitoring approach has been presented here to monitor the accepted marcels above a threshold. The fatigue life of specimen is most affected in the presence of a marcel. Hence this study focused on the damage evaluation after fatigue testing. Wavy laminate was subjected to fatigue load to investigate the fracture mechanisms near the marcel. Different types of defects were identified from this study and were used to develop appropriate instrumentation for health monitoring of a wavy laminate using PVDF patches.

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Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

This article appeared in AIP Conference Proceedings 1511 (2012): 310–316 and may be found at http://dx.doi.org/10.1063/1.4789063.

Keywords
blades, condition monitoring, fatigue testing, fracture, structural engineering, ultrasonics, wind turbines, nondestructive evaluation, QNDE, Aerospace Engineering
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