On the use of an array of ultrasonic immersion transducers for the nondestructive testing of immersed plates

Pistone, Elisabetta; Rizzo, Piervincenzo

doi:10.1080/10589759.2014.979817

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…These pits are the effects of past exposure to water. 36,38,54 For this second set of experiments, the previous transducer was mounted in a four-wheel cart ( Figure 3(d)) to enable the scan of the specimen, along the lines shown in Figure 3(a). The start point was 100 mm away from the left edge, and 15 measurements were taken every 50 mm at 58 positions total.…”

Section: Multi-layer Systemmentioning

confidence: 99%

Outlier analysis of nonlinear solitary waves for health monitoring applications

Zheng

Rizzo

Nasrollahi

2019

Structural Health Monitoring

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The structural health monitoring/nondestructive evaluation method based on the generation and detection of highly nonlinear solitary waves is emerging as a cost-effective technique to monitor or inspect a variety of structures and materials. These waves possess unique characteristics not seen in conventional ultrasounds. Outlier analysis is a statistic tool able to identify anomalies in data that diverge from a set of baseline data. Although outlier analysis has received considerable attention for defect detection using modal data, guided ultrasonic waves, or other nondestructive approaches, its application for the analysis of solitary waves has never been explored. In the study presented in this article, the use of outlier analysis in terms of discordancy test and Mahalanobis squared distance was investigated to enhance the damage detection capability of a monitoring system based on highly nonlinear solitary waves. Two experiments were performed to demonstrate the procedure. In the first experiment, a thick steel plate was probed with a solitary wave transducer placed above the plate, and damage was simulated in terms of a foreign object magnetically attached to the bottom of the plate, at different distances from the transducer. In the second experiment, two aluminum plates were placed above each other in dry contact with the top plate subjected to localized, mostly hidden, defects. The transducer used in the first experiment was in this second test encased in a small cart with wheels to scan the sample at discrete positions. For both experiments, a few features were extracted from the time waveforms and fed to a univariate and a multivariate analysis that compared the testing data to a set of baseline data. The results show that the outlier analysis significantly improves the ability to detect damage using solitary waves.

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Section: Multi-layer Systemmentioning

confidence: 99%

Outlier analysis of nonlinear solitary waves for health monitoring applications

Zheng

Rizzo

Nasrollahi

2019

Structural Health Monitoring

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“…4 show the time waveforms recorded by the five sensors during the first scan at the testing point 5. The wave packet tailing the leaky S 0 mode is the leaky A 0 mode, followed by the quasi-Scholte wave 26,29,30 propagating at the solid-liquid interface, and the leaky S 0 mode reflected from the water surface. To ease the direct comparison among the ultrasonic traces, the scale of the amplitudes was kept identical.…”

Section: Feature Extractionmentioning

confidence: 99%

“…[26][27][28][29] In the study presented in this article, we replaced the laser with a focused transducer to generate tone bursts centered at 500 kHz. The system consists of a pulsed laser or a focused immersion transducer to insonify the waveguide and an array of immersion ultrasonic transducers (IUTs) to sense leaky Lamb waves.…”

Section: Introductionmentioning

confidence: 99%

Guided ultrasonic wave testing of an immersed plate with hidden defects

Bagheri

Rizzo

2015

Opt. Eng

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This paper presents the results of an experimental study in which guided ultrasonic waves are used for the contactless nondestructive testing of a plate immersed in water. In the experiment, narrowband leaky Lamb waves are generated using a focused transducer and are detected with an array of five immersion sensors arranged in a semicircle. The ultrasonic signals are processed to extract a few damage-sensitive features from the time and frequency domains. These features are then fed to an artificial neural network to identify the presence of hidden defects, i.e., defects devised on the surface of the plate not facing the probing system. We find that the noncontact inspection system and the signal processing technique enable the classification of the plate health with a success rate >75%. Bagheri and Rizzo: Guided ultrasonic wave testing of an immersed plate with hidden defects Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/16/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 011003-5 January 2016 • Vol. 55(1) Bagheri and Rizzo: Guided ultrasonic wave testing of an immersed plate with hidden defects Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/16/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 011003-7 January 2016 • Vol. 55(1) Bagheri and Rizzo: Guided ultrasonic wave testing of an immersed plate with hidden defects Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/16/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 011003-10 January 2016 • Vol. 55(1) Bagheri and Rizzo: Guided ultrasonic wave testing of an immersed plate with hidden defects Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/16/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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“…Most of the energy of a Scholte wave decays exponentially in solid and fluid media. Some studies using Scholte waves and quasi-Scholte waves were presented to validate the propagation characteristics [24][25][26][27][28]. Stoneley waves propagate at the interface between two solid media [29].…”

Section: Interface Wave Propagation Theorymentioning

confidence: 99%

Evaluation of Interface Defects in Inaccessible Reactor Shrink Fit Nozzle Welds Using Ultrasonic Waves

Lee

Cho

2017

Energies

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Abstract:This study proposes an effective method to inspect inaccessible nuclear power reactor head nozzles using interface waves that propagate along the shrink fit boundary of a reactor head. The reactor head is relatively thick, which makes it difficult to inspect from the outside by conventional ultrasonic testing. However, interface waves can propagate a long distance from a fixed transducer position. The inside of the nuclear reactor has limited access due to the high radiation, so the transducers are located outside the nuclear reactor head, and interface waves propagate into the nuclear reactor to detect defects. A numerical simulation and experiments were carried out to validate the method. Various defect cases that simulate field failures are also presented, and the proposed technique shows satisfactory defect classification.

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On the use of an array of ultrasonic immersion transducers for the nondestructive testing of immersed plates

Cited by 7 publications

References 27 publications

Outlier analysis of nonlinear solitary waves for health monitoring applications

Outlier analysis of nonlinear solitary waves for health monitoring applications

Guided ultrasonic wave testing of an immersed plate with hidden defects

Evaluation of Interface Defects in Inaccessible Reactor Shrink Fit Nozzle Welds Using Ultrasonic Waves

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