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Sensors 2016, 16(9), 1511; doi:10.3390/s16091511

Stripe-PZT Sensor-Based Baseline-Free Crack Diagnosis in a Structure with a Welded Stiffener

1
International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, China
2
Department of Architectural Engineering, Sejong University, Seoul 05006, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 12 April 2016 / Revised: 25 June 2016 / Accepted: 25 July 2016 / Published: 16 September 2016
(This article belongs to the Section Physical Sensors)

Abstract

This paper proposes a stripe-PZT sensor-based baseline-free crack diagnosis technique in the heat affected zone (HAZ) of a structure with a welded stiffener. The proposed technique enables one to identify and localize a crack in the HAZ using only current data measured using a stripe-PZT sensor. The use of the stripe-PZT sensor makes it possible to significantly improve the applicability to real structures and minimize man-made errors associated with the installation process by embedding multiple piezoelectric sensors onto a printed circuit board. Moreover, a new frequency-wavenumber analysis-based baseline-free crack diagnosis algorithm minimizes false alarms caused by environmental variations by avoiding simple comparison with the baseline data accumulated from the pristine condition of a target structure. The proposed technique is numerically as well as experimentally validated using a plate-like structure with a welded stiffener, reveling that it successfully identifies and localizes a crack in HAZ. View Full-Text
Keywords: stripe-PZT sensor; Lamb wave; baseline-free crack diagnosis; welded stiffener; structural health monitoring; nondestructive testing stripe-PZT sensor; Lamb wave; baseline-free crack diagnosis; welded stiffener; structural health monitoring; nondestructive testing
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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. (CC BY 4.0).

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MDPI and ACS Style

An, Y.-K.; Shen, Z.; Wu, Z. Stripe-PZT Sensor-Based Baseline-Free Crack Diagnosis in a Structure with a Welded Stiffener. Sensors 2016, 16, 1511.

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