期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 45, 期 2, 页码 468-478出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2013.12.001
关键词
Fatigue crack detection; Nonlinear ultrasonic modulation; Reference-free damage detection; Temperature and loading variations; PZT
资金
- Smart IT Convergence System Research Center as Global Frontier Project [CISS-2012M3A6A6054195]
- National Research Laboratory (NRL) Program of the National Research Foundation of Korea (NRF) [2012-0005630]
- Ministry of Education, Science and Technology (MEST)
- U.S. Air Force Research Laboratory
- National Research Foundation of Korea [2011-0031870] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study presents a reference-free fatigue crack detection technique using nonlinear ultrasonic modulation. When low frequency (LF) and high frequency (HF) inputs generated by two surface-mounted lead zirconate titanate (PZT) transducers are applied to a structure, the presence of a fatigue crack can provide a mechanism for nonlinear ultrasonic modulation and create spectral sidebands around the frequency of the HF signal. The crack-induced spectral sidebands are isolated using a combination of linear response subtraction (LRS), synchronous demodulation (SD) and continuous wavelet transform (CWT) filtering. Then, a sequential outlier analysis is performed on the extracted sidebands to identify the crack presence without referring any baseline data obtained from the intact condition of the structure. Finally, the robustness of the proposed technique is demonstrated using actual test data obtained from simple aluminum plate and complex aircraft fitting-lug specimens under varying temperature and loading variations. (C) 2013 Elsevier Ltd. All rights reserved.
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