A fast forward model of pulsed eddy current inspection of multilayered tubular structures

Li, Yong; Liu, Xiangbiao; Chen, Zhenmao; Zhao, Hongda; Cai, Wenlu

doi:10.3233/jae-141859

Cited by 15 publications

(5 citation statements)

References 7 publications

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“…However, too many frequencies are required for an accurate result. For example in [8], it is stated that a large number of 1500 distinct frequencies is required for a reliable computation. In order to reduce computational time, interpolation is used in the frequency spectrum and the number of frequencies is dictated by a logarithmic rule.…”

Section: Time Response and Laplace Inversionmentioning

confidence: 99%

“…In [9], such an interpolation is also used combined with an interpolation on the integration variable q since the integral expression (2.1) is used rather than the summation one (2.2). The latter interpolation is justified in that paper due to the very large number of 1500 summation terms, referring to [8]. This is, however, a misconception since the number 1500 refers to the frequency values and not to the axial terms, thus making the use of tedious integral expression unnecessary.…”

Section: Time Response and Laplace Inversionmentioning

confidence: 99%

“…Nevertheless, more representative axisymmetric models for the case of a multi-layer cylindrical system have been obtained in the frequency domain [7], followed by similar studies for pulsed excitations [8,9]. These use Fourier superposition, but such an approach can be time consuming and may suffer from the Gibb's phenomenon.…”

Section: Introductionmentioning

confidence: 99%

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Efficient calculation of transient eddy current response from multi-layer cylindrical conductive media

Theodoulidis

Skarlatos

2020

Phil. Trans. R. Soc. A.

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The transient response from a transmitter–receiver coil system inside a multi-layer cylindrical conductive configuration is obtained. The particular set-up applies to well logging as well as to eddy current tube testing. In this work, a number of improvements are presented to existing models for an efficient calculation of the induced voltage. These include: domain truncation, novel treatment of arbitrary number of layers in order to avoid computational overflows and efficient time response calculation. The latter is based on a combination of Laplace inversion techniques for short- and long-time transient responses. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

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Section: Time Response and Laplace Inversionmentioning

confidence: 99%

Section: Time Response and Laplace Inversionmentioning

confidence: 99%

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Efficient calculation of transient eddy current response from multi-layer cylindrical conductive media

Theodoulidis

Skarlatos

2020

Phil. Trans. R. Soc. A.

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“…Therefore, the analytical modeling is applicable for fast and accurate solutions to the related electromagnetic quantities. In light of this, a 3D hybrid model integrating the analytical modeling i.e., the Extended Truncated Region Eigenfunction Expansion (ETREE) modeling for solving electromagnetic problems [ 16 , 17 , 18 ] with 3D FEM for simulations of the ultrasonic field [ 8 ] is proposed. The schematic illustration of the 3D hybrid model is portrayed in Figure 2 .…”

Section: 3d Hybrid Model Of the Proposed Transducermentioning

confidence: 99%

A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes

Cai

Yan

et al. 2018

Sensors

Self Cite

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For fuel transmission and structural strengthening, small-diameter pipes of nonmagnetic materials are extensively adopted in engineering fields including aerospace, energy, transportation, etc. However, the hostile and corrosive environment leaves them vulnerable to external corrosion which poses a severe threat to structural integrity of pipes. Therefore, it is imperative to nondestructively detect and evaluate the external corrosion in nonmagnetic pipes. In light of this, a capsule-type Electromagnetic Acoustic Transducer (EMAT) for in-situ nondestructive evaluation of nonmagnetic pipes and fast screening of external corrosion is proposed in this paper. A 3D hybrid model for efficient prediction of responses from the proposed transducer to external corrosion is established. Closed-form expressions of field quantities of electromagnetics and EMAT signals are formulated. Simulations based on the hybrid model indicate feasibility of the proposed transducer in detection and evaluation of external corrosion in nonmagnetic pipes. In parallel, experiments with the fabricated transducer have been carried out. Experimental results are supportive of the conclusion drawn from simulations. The investigation via simulations and experiments implies that the proposed capsule-type EMAT is capable of fast screening of external corrosion, which is beneficial to the in-situ nondestructive evaluation of small-diameter nonmagnetic pipes.

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“…Currently, many methods, such as X-ray testing, penetrant testing (PT), eddy current testing (ECT), magnetic particle testing (MT), ultrasonic testing (UT), acoustic emission testing (AET), and IR-thermography (IRT), are being used in the automotive industry. Among them, the research of solder joints and structural parts is in the majority [11][12][13][14][15][16][17]. Pulsed eddy current (PEC) is an effective NDT method for conductive materials [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Pulsed Eddy Current Nondestructive Testing for Defect Evaluation and Imaging of Automotive Lightweight Alloy Materials

Zhang

2018

Journal of Sensors

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Rapid and accurate damage detection of magnesium-aluminum alloy, which is an important material for automotive lightweight, is of great significance. Pulsed eddy current (PEC) is an effective electromagnetic nondestructive testing and evaluation (NDT&E) technique for metal materials. Metal loss evaluation and imaging are one of the most important steps in quality control and maintenance of key components of automobiles. A PEC method based on a rectangular excitation coil and an axial parallel pickup coil is proposed and investigated for the purpose of metal loss evaluation and imaging. Metal loss type of defects with different sections is designed and detected using line scanning technique and C-scan imaging in two scanning directions. Experimental results have illustrated that metal loss depth can be estimated effectively by the peak amplitude of PEC A-scan response. Then, the quantification information of metal loss depth is preliminarily obtained based on the linear fitting equation. Consequently, metal loss evaluation is realized by line scanning peak waves and C-scan pseudo 3D images. At last, the sensitivity comparison shows that the metal loss can be detected in both directions. The proposed method is an effective approach to evaluate the image surface-breaking metal loss in automotive lightweight alloy materials.

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A fast forward model of pulsed eddy current inspection of multilayered tubular structures

Cited by 15 publications

References 7 publications

Efficient calculation of transient eddy current response from multi-layer cylindrical conductive media

Efficient calculation of transient eddy current response from multi-layer cylindrical conductive media

A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes

Pulsed Eddy Current Nondestructive Testing for Defect Evaluation and Imaging of Automotive Lightweight Alloy Materials

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