1 April 2010 Experimental validations of a baseline-free crack detection technique using dual-PZTs
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Guided wave-based structural health monitoring (SHM) techniques have been widely studied by many researchers. Recently, a new damage detection technique without comparison with baseline data is developed by the author's group. Since the baseline-free technique does not require the baseline data obtained from the healthy condition of a structure, this technique may reduce false alarms due to operational and environmental variations of the structure. However, the previously developed technique requires the placements of two pairs of collocated lead zirconate titanate transducers (PZTs), and each pair of PZTs should be properly collocated and identical. These constraints make the previous technique susceptible to varying PZT conditions, and they cannot be applied to structures such as pipelines and aircrafts where access to both surfaces of the structures is limited. In this study, a new PZT called dual-PZT is designed so that the limitations of the previous baseline-free technique can be overcome. To validate the applicability and robustness against undesirable variations in the system, experimental studies with an aluminum plate subjected to varying temperature as well as loading conditions are performed. Furthermore, the proposed baseline-free technique is applied to a decommissioned bridge (Ramp-G Bridge in Korea) to verify the feasibility of the proposed techniques in a real bridge structure.
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Yun-Kyu An, Yun-Kyu An, Hoon Sohn, Hoon Sohn, } "Experimental validations of a baseline-free crack detection technique using dual-PZTs", Proc. SPIE 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010, 76473R (1 April 2010); doi: 10.1117/12.847463; https://doi.org/10.1117/12.847463

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