Affiliations: School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China
Correspondence:
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Corresponding author: Xinjun Wu, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, China. Tel./Fax: +86 27 87559332; E-mail:xinjunwu@mail.hust.edu.cn
Abstract: A new magnetostrictive steady-state guided wave technique
(MST) based on long time excitation is proposed for Nondestructive
Evaluation (NDE) and Structural Health Monitoring (SHM) in pipes. Due to
the non-contact inspection, it has no need to consider the influence on
vibration state while moving sensors along the pipe. Both simulation and
experimental results show that the vibration state is associated with
specific propagating guided wave mode and the defect causes an obvious
change of the steady-state stage vibration amplitude at certain specific
positions along the pipe, which can be utilized for defect location.
Moreover, the precision of defect location increases with the excitation
frequency increasing.
Keywords: Long time excitation, non-contact inspection, steady-state vibration, defect detection
