An SVM approach with electromagnetic methods to assess metal plate thickness

Ramos, Helena G.; Rocha, Tiago; Král, Jakub; Pasadas, Dário J.; Ribeiro, A. Lopes

doi:10.1016/j.measurement.2014.01.035

Cited by 32 publications

(19 citation statements)

References 17 publications

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“…ECT is also used to evaluate defects in various other environments and configurations [14]. These include flaws in steam generator tubes [18][19][20][21][22][23], fatigue cracks [24][25][26], corrosion [27][28][29][30][31][32][33], material microstructure near welds [34], and estimation of pearlite percentages in plain carbon steels [35,36] and in cast irons [37]. High density eddy current C-Scan data has also been used for the analysis of bolt hole eddy current [38] and estimation of micro-crack lengths [39].…”

Section: Introductionmentioning

confidence: 99%

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Reyno¹,

Underhill²,

Krause³

et al. 2017

Preprint

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Surface damage on honeycomb aircraft panels is often measured manually, and is therefore subject to variation based on inspection personnel. Eddy current testing (ECT) is sensitive to variations in probe-to-specimen spacing, or lift-off, and is thus promising for high resolution profiling of surface damage on aluminum panels. Lower frequency testing also allows inspection through the face sheet, an advantage over optical 3D scanning methods. This paper presents results from the ECT inspection of surface damage on an approximately flat aluminum honeycomb aircraft panel, and compares the measurements to those taken using optical 3D scanning technology. An ECT C-Scan of the dented panel surface was obtained by attaching the probe to a robotic scanning apparatus. Data was taken simultaneously at four frequencies of 25, 100, 400 and 1,600 kHz. A reference surface was then defined that approximated the original, undamaged panel surface, which also compensated for the effects of specimen tilt and thermal drift within the ECT instrument. Data was converted to lift-off using height calibration curves developed for each probe frequency. A damage region of 22,550 mm 2 area with dents ranging in depth from 0.13-1.01 mm was analyzed. The method was accurate at 1,600 kHz to within 0.05 mm (2σ) when compared with 231 measurements taken via optical 3D scanning. Testing at 25 kHz revealed a 3.2 mm cell size within the honeycomb core, which was confirmed via destructive evaluation. As a result, ECT demonstrates potential for implementation as a method for rapid in-field aircraft panel surface damage assessment.

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Section: Introductionmentioning

confidence: 99%

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Reyno¹,

Underhill²,

Krause³

et al. 2017

Preprint

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“…(12), (13), and (15) require two parameter values, C and γ. If these are incorrectly specified, large errors can occur.…”

Section: Optimization Of Svm Parametersmentioning

confidence: 99%

“…SVMs are mostly used for classification and regression problems using well-trained datasets. They have been effectively used for classification applications such as metal plate thickness assessments, 13 image-based cable defect classification, 14 ultrasonic-based pipeline defect predictions, 15 and fingerprint classification. 16 This paper introduces a novel approach that can accurately recognize crack and pit defects using ACPD and an SVM.…”

Section: Introductionmentioning

confidence: 99%

An SVM approach with alternating current potential drop technique to classify pits and cracks on the bottom of a metal plate

Gan

Wan

et al. 2016

AIP Advances

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An SVM approach with alternating current potential drop technique to classify pits and cracks on the bottom of a metal plateThe alternating current potential drop (ACPD) is a nondestructive technique that is widely used to detect and size defects in conductive material. This paper describes a combined ACPD and support vector machine (SVM) approach to accurately recognize typical defects on the bottom surface of a metal plate, i.e., pits and cracks. We first conducted a simulation study, and then, based on ACPD, measured five voltage ratios between the test region and reference region. The analysis of finite simulation data enables the binary classification of two kinds of defects. To obtain an accurate separating hyperplane, key parameters of the SVM classifier were optimized using a genetic algorithm with training data from the simulations. Based on the optimized SVM classifier, reliable estimates of the defects in a metal plate were then obtained. The recognition results of the simulation dataset shows that the trained and optimized SVM model has a high classification accuracy, and the metal plate experiment also indicates that the model has good precision in actual defect classification. C 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license

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“…The measurement of conductive material thickness was performed using Eddy current technique [71]. On the other hand, Chen and Lei [72] used the PEC for measuring the thickness of a ferromagnetic plate.…”

Section: Other Applicationsmentioning

confidence: 99%

“…The fast crack profile reconstruction methods using transient time and spectral components of PEC signals were carried out on EDM slots of 3 mm, 4 mm, 6 mm, 6 Advances in Mechanical Engineering [18][19][20][21][22][23] E m p l o y e d E C p r o b e s [27] EC probe mounted in a planar probe [28] Optimized EC array technique Fatigue crack [51] EC with operating frequency range between 200 Hz and 100 kHz [52] A uniform EC probe with 23 arrayed detectors [53] I n d u c t i o n P E C T [2,54,55] Eddy current [56] EC with an array probe [57] EC-giant magnetoresistive (EC-GMR) sensor system Corrosion [47,[58][59][60][61][62]71] Eddy current [63,72] P E C [66] Electromagnetic acoustic transducer-Eddy current (EMAT-EC) dual probe Material microstructure [67] Eddy current Estimation of pearlite [68][69][70] Eddy current and 8 mm depth [77]. The method provided initial approximate profiles for crack shape reconstruction using different PEC signals such as amplitude, phase, real and imaginary values of spectral components, and transient slices using reconstruction mean square errors (MSE) which reduces the computing time.…”

Section: Pulsed Eddy Current (Pec)mentioning

confidence: 99%

Defect Characterization Based on Eddy Current Technique: Technical Review

Ghoni

Dollah

Sulaiman

et al. 2014

Advances in Mechanical Engineering

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Eddy current testing is widely used for nondestructive evaluation of metallic structures in characterizing numerous types of defects occurring in various locations. It offers remarkable advantages over other nondestructive techniques because of its ease of implementation. This paper presents a technical review of Eddy current technique in various scope of defect detection. The first part presents Eddy current evaluation on various defects location and orientation such as steam generator tubes, stress crack corrosion, and fatigue cracks. The next section analyzes the use of pulsed Eddy current and pulsed Eddy current thermography as an alternative method for monitoring the growth of cracks with the aid of computational techniques for postsignal analysis.

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An SVM approach with electromagnetic methods to assess metal plate thickness

Cited by 32 publications

References 17 publications

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

An SVM approach with alternating current potential drop technique to classify pits and cracks on the bottom of a metal plate

Defect Characterization Based on Eddy Current Technique: Technical Review

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