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Guided Waves for Structural Health Monitoring (GW4SHM)
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Guided Waves for Structural Health Monitoring (GW4SHM)

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Physical Sensors".

Deadline for manuscript submissions: 30 April 2024 | Viewed by 2001

Special Issue Editors

Dr. Jens Prager

E-Mail Website
Guest Editor
Department of Non-Destructive Testing, Acoustic and Electromagnetic Methods Division, Bundesanstalt für Materialforschung und -Prüfung (BAM), 12205 Berlin, Germany
Interests: lamb waves; damage detection
Dr. Luca De Marchi

E-Mail Website
Guest Editor
Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna, 40136 Bologna, Italy
Interests: signal processing; NDT; ultrasound; SHM; sensors; lamb waves; guided wave propagation; damage detection; acoustic emissions
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Structural health monitoring (SHM) is essential to guarantee the safe and reliable operation of technical appliances and engineering structures including chemical and power plants, gas and oil pipelines, transport systems, and aeronautic structures. Many sensing techniques have been investigated in the scientific literature to implement SHM systems. In particular, ultrasonic guided waves (GWs) are a promising approach to monitor the integrity of largely extended structures. In this context, this Special Issue plans to collect research outputs regarding the European Project “GW4SHM”, whose aim is to combine efficient simulation and signal processing tools for GW-based SHM, to assess the reliability of the monitoring systems, and to train a new generation of researchers, enabling them to convert SHM research into practical applications.

Dr. Jens Prager
Dr. Luca De Marchi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (2 papers)

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Research

17 pages, 7360 KiB  
Article
Evaluation of Welded Lap Joints Using Ultrasonic Guided Waves
by Hussain Altammar and Mohammad Faseeulla Khan
Sensors 2024, 24(5), 1384; https://doi.org/10.3390/s24051384 - 21 Feb 2024
Viewed by 477
Abstract
Welded lap joints play a vital role in a wide range of engineering structures such as pipelines, storage tanks, pressure vessels, and ship hulls. This study aims to investigate the propagation of ultrasonic guided waves in steel welded lap joints for the baseline-free [...] Read more.
Welded lap joints play a vital role in a wide range of engineering structures such as pipelines, storage tanks, pressure vessels, and ship hulls. This study aims to investigate the propagation of ultrasonic guided waves in steel welded lap joints for the baseline-free inspection of joint defects using the mode conversion of Lamb waves. The finite element method was used to simulate a single lap joint with common defects such as corrosion and disbonding. To identify the propagating wave modes, a wavenumber–frequency analysis was conducted using the 2D fast Fourier transform. The power loss of the transmitted modes was also determined to identify damage in the lap joints. The results indicate that the A0 incident in pristine conditions experienced significant transmission losses of about 9.5 dB compared to an attenuation of 2.8 dB for the S0 incident. The presence of corrosion was found to reduce these transmission losses by more than 28%. In contrast, introducing disbonding in the lap joint increased the transmission loss of the S0 incident, while a negligible loss was observed for the A0 incident. The mode-converted S0 (MC-S) and mode-converted A0 (MC-A0) incidents were found to exhibit a unique sensitivity to the presence of corrosion and disbonding. The results indicate that MC-S0 and MC-A0 as well as Lamb mode incidents interact differently in terms of corrosion and disbonding, providing a means to identify damage without relying on baseline signals. Full article
(This article belongs to the Special Issue Guided Waves for Structural Health Monitoring (GW4SHM))
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13 pages, 23402 KiB  
Article
On Dispersion Compensation for GAW-Based Structural Health Monitoring
by Alexander Backer, Viktor Fairuschin and Klaus Stefan Drese
Sensors 2023, 23(9), 4282; https://doi.org/10.3390/s23094282 - 26 Apr 2023
Viewed by 982
Abstract
Guided acoustic waves (GAW) have proven to be a useful tool for structural health monitoring (SHM). However, the dispersive nature of commonly used Lamb waves compromises the spatial resolution making it difficult to detect small or weakly reflective defects. Here we demonstrate an [...] Read more.
Guided acoustic waves (GAW) have proven to be a useful tool for structural health monitoring (SHM). However, the dispersive nature of commonly used Lamb waves compromises the spatial resolution making it difficult to detect small or weakly reflective defects. Here we demonstrate an approach that can compensate for the dispersive effects, allowing advanced algorithms to be used with significantly higher signal-to-noise ratio and spatial resolution. In this paper, the sign coherence factor (SCF) extension of the total focusing method (TFM) algorithm is used. The effectiveness is examined by numerical simulation and experimentally demonstrated by detecting weakly reflective layers with a highly dispersive A0 mode on an aluminum plate, which are not detectable without compensating for the dispersion effects. Full article
(This article belongs to the Special Issue Guided Waves for Structural Health Monitoring (GW4SHM))
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