Guided ultrasonic wave testing of an immersed plate with hidden defects

Bagheri, Abdollah; Rizzo, Piervincenzo

doi:10.1117/1.oe.55.1.011003

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…In a realistic case, these parameters would be unknown and would significantly affect the damage signal. Artificial neural networks have also been employed, where features extracted are fed to the network, enabling the classification of defects with a success rate > 75 % [56]. Defect identification can also be performed by using baseline methods, processing the signals and extracting the time parameters of the wave packets in mode conversion signals [37,57,58].…”

Section: Ianni Et Al Accomplished the Minimisation Of The Number Of S...mentioning

confidence: 99%

A Review of Signal Processing Techniques for Ultrasonic Guided Wave Testing

Diogo

Moreira²,

Gouveia³

et al. 2022

Metals

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Ultrasonic guided wave testing (UGWT) is a non-destructive testing (NDT) technique commonly used in structural health monitoring to perform wide-range inspection from a single point, thus reducing the time and effort required for NDT. However, the multi-modal and dispersive nature of guided waves makes the extraction of essential information that leads to defect detection an extremely challenging task. The purpose of this article is to give an overview of signal processing techniques used for filtering signals, isolating modes and identifying and localising defects in UGWT. The techniques are summarised and grouped according to the geometry of the studied structures. Although the reviewed techniques have led to satisfactory results, the identification of defects through signal processing remains challenging with space for improvement, particularly by combining signal processing techniques and integrating machine learning algorithms.

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Section: Ianni Et Al Accomplished the Minimisation Of The Number Of S...mentioning

confidence: 99%

A Review of Signal Processing Techniques for Ultrasonic Guided Wave Testing

Diogo

Moreira²,

Gouveia³

et al. 2022

Metals

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“…Lamb wave is prominent for the excitation of GWUT in thin plates and other flat composite structures because it influences structure properties and propagates useful signal information regarding the structure’s integrity. It is sensitive to sundry defects and discontinuity that manifests in its in-plane S 0 and out-plane A 0 modes [ 58 , 59 , 60 , 61 , 62 ]. These are fundamental modes of symmetric and antisymmetric modes of Lamb wave that are dispersive.…”

Section: Ultrasonic Guided Wave Ugwmentioning

confidence: 99%

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

Olisa

Khan

Starr

2021

Sensors

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Damage is an inevitable occurrence in metallic structures and when unchecked could result in a catastrophic breakdown of structural assets. Non-destructive evaluation (NDE) is adopted in industries for assessment and health inspection of structural assets. Prominent among the NDE techniques is guided wave ultrasonic testing (GWUT). This method is cost-effective and possesses an enormous capability for long-range inspection of corroded structures, detection of sundries of crack and other metallic damage structures at low frequency and energy attenuation. However, the parametric features of the GWUT are affected by structural and environmental operating conditions and result in masking damage signal. Most studies focused on identifying individual damage under varying conditions while combined damage phenomena can coexist in structure and hasten its deterioration. Hence, it is an impending task to study the effect of combined damage on a structure under varying conditions and correlate it with GWUT parametric features. In this respect, this work reviewed the literature on UGWs, damage inspection, severity, temperature influence on the guided wave and parametric characteristics of the inspecting wave. The review is limited to the piezoelectric transduction unit. It was keenly observed that no significant work had been done to correlate the parametric feature of GWUT with combined damage effect under varying conditions. It is therefore proposed to investigate this impending task.

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“…This antisymmetric Lamb wave mode can be directly used in practical applications such as the estimation of the plate thickness [20], detection of defects in underwater pipes [5], identification of corrosion damage in submerged metallic structures [6], etc. Meanwhile, due to characteristics such as low attenuation, symmetric modes, especially those at a specific fd range, are frequently used in evaluations of solid plates, such as in hidden defect detection [21], multiple defect detection [22], corrosion monitoring [23], imaging of immersed plates with defects [24], and so on. These symmetric modes of Lamb waves at a specific fd range can also be generated and detected by contact-transducers.…”

Section: Introductionmentioning

confidence: 99%

Defects Detection and Localization in Underwater Plates Using Laser Laterally Generated Pure Non-Dispersive S0 Mode

Xie

Shen

2019

Applied Sciences

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Featured Application: This study provides a non-contact method of defect detection and localization in underwater plates using pure S 0 mode of Lamb wave with small dispersion generated by laterally distributed laser source.Abstract: When working in humid environments, corrosion defects are easily produced in metallic plates. For defect detection in underwater plates, symmetric modes of Lamb waves are widely used because of their characteristics including long propagating distance and high sensitivity to defects. In this study, we extend our previous work by applying the laser laterally generated S 0 mode to detection and localization of defects represented by artificial notches in an aluminum plate immersed in water. Pure non-dispersive S 0 mode is generated in an underwater plate by lateral laser source irradiation and its fd (frequency·thickness) range is selected by theoretical calculation. Using this lateral excitation, the S 0 mode is enhanced; meanwhile, the A 0 mode is effectively suppressed. The mode-converted A 0 mode from the incident S 0 mode is used to detect and localize the defect. The results reveal a significantly improved capability to detect defects in an underwater plate using the laser laterally generated S 0 mode, while that using A 0 is limited due to its high attenuation. Furthermore, owing to the long propagating distance and the non-dispersion characteristics of the S 0 generated by the lateral laser source, multiple defects can also be detected and localized according to the mode conversion at the defects.

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Guided ultrasonic wave testing of an immersed plate with hidden defects

Cited by 6 publications

References 26 publications

A Review of Signal Processing Techniques for Ultrasonic Guided Wave Testing

A Review of Signal Processing Techniques for Ultrasonic Guided Wave Testing

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

Defects Detection and Localization in Underwater Plates Using Laser Laterally Generated Pure Non-Dispersive S0 Mode

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