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Shock and Vibration
Volume 2014, Article ID 430854, 9 pages
http://dx.doi.org/10.1155/2014/430854
Research Article

Damage Identification of Wind Turbine Blades Using Piezoelectric Transducers

1School of Mechanical Systems Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea
2Engineering Institute, MS T001, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

Received 14 February 2013; Accepted 14 June 2013; Published 7 April 2014

Academic Editor: Jung-Ryul Lee

Copyright © 2014 Seong-Won Choi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents the experimental results of active-sensing structural health monitoring (SHM) techniques, which utilize piezoelectric transducers as sensors and actuators, for determining the structural integrity of wind turbine blades. Specifically, Lamb wave propagations and frequency response functions at high frequency ranges are used to estimate the condition of wind turbine blades. For experiments, a 1 m section of a CX-100 blade is used. The goal of this study is to assess and compare the performance of each method in identifying incipient damage with a consideration given to field deployability. Overall, these methods yielded a sufficient damage detection capability to warrant further investigation. This paper also summarizes the SHM results of a full-scale fatigue test of a 9 m CX-100 blade using piezoelectric active sensors. This paper outlines considerations needed to design such SHM systems, experimental procedures and results, and additional issues that can be used as guidelines for future investigations.