title: Stripe-PZT Sensor-Based Baseline-Free Crack Diagnosis in a Structure with a Welded Stiffener.
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.
authors.affiliation: International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, China. yunkyuan@sejong.ac.kr.|Department of Architectural Engineering, Sejong University, Seoul 05006, Korea. yunkyuan@sejong.ac.kr.
authors.forename: Yun-Kyu
authors.initials: YK
authors.lastname: An
authors.affiliation: International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, China. 220131048@seu.edu.cn.
authors.forename: Zhiqi
authors.initials: Z
authors.lastname: Shen
authors.affiliation: International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, China. zswu@seu.edu.cn.
authors.forename: Zhishen
authors.initials: Z
authors.lastname: Wu
keywords: Lamb wave; baseline-free crack diagnosis; nondestructive testing; stripe-PZT sensor; structural health monitoring; welded stiffener