期刊
JOURNAL OF SOUND AND VIBRATION
卷 333, 期 5, 页码 1473-1484出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2013.10.032
关键词
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资金
- Smart IT Convergence System Research Center as Global Frontier Project [CISS-2012M3A6A6054195]
- National Research Laboratory (NRL) Program [2012-0005630]
- National Research Foundation of Korea (NRF)
- 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 fatigue crack detection technique using nonlinear ultrasonic wave modulation. Ultrasonic waves at two distinctive driving frequencies are generated and corresponding ultrasonic responses are measured using permanently installed lead zirconate titanate (PZT) transducers with a potential for continuous monitoring. Here, the input signal at the lower driving frequency is often referred to as a 'pumping' signal, and the higher frequency input is referred to as a 'probing' signal. The presence of a system nonlinearity, such as a crack formation, can provide a mechanism for nonlinear wave modulation, and create spectral sidebands around the frequency of the probing signal. A signal processing technique combining linear response subtraction (LRS) and synchronous demodulation (SD) is developed specifically to extract the crack-induced spectral sidebands. The proposed crack detection method is successfully applied to identify actual fatigue cracks grown in metallic plate and complex rating-lug specimens. Finally, the effect of pumping and probing frequencies on the amplitude of the first spectral sideband is investigated using the first sideband spectrogram (FSS) obtained by sweeping both pumping and probing signals over specified frequency ranges. (C) 2013 Elsevier Ltd. All rights reserved.
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