Development of a "stick-and-detect" wireless sensor node for fatigue crack detection

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A fatigue crack and its precursor often serves as a source of nonlinear mechanism for ultrasonic waves, and nonlinear ultrasonic techniques have been widely studied to detect fatigue crack at its very early stage. In this study, a wireless sensor node based on nonlinear ultrasonics is developed specifically for fatigue crack detection: (1) through packaged piezoelectric transducers, ultrasonic waves at two distinctive frequencies are generated, and their modulation due to a microcrack (less than 0.1mm in width) is detected; (2) an autonomous reference-free crack detection algorithm is developed and embedded into the sensor node, so that users can simply stick the sensor to a target structure and automatically detect a fatigue crack without relying on any history data of the target structure; and (3) the whole design of the sensor node is fulfilled in a low-power working strategy. The performance of the sensor node is experimentally validated using aluminum plates with real fatigue cracks and compared with that of a conventional wired system. Furthermore, a field test in Yeongjong Grand Bridge in South Korea has been conducted with the developed sensor nodes.
Publisher
SAGE PUBLICATIONS LTD
Issue Date
2017-03
Language
English
Article Type
Article
Keywords

ELASTIC-WAVE SPECTROSCOPY; DISCERN MATERIAL DAMAGE; NEWS TECHNIQUES; MODULATION; NETWORKS; TEMPERATURE; CONCRETE

Citation

STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL, v.16, no.2, pp.153 - 163

ISSN
1475-9217
DOI
10.1177/1475921716666532
URI
http://hdl.handle.net/10203/220964
Appears in Collection
CE-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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