Analytical approaches to eddy current nondestructive evaluation for stratified conductive structures

Zhang, Jianhai; Yuan, Maodan; Xu, Zhixing; Kim, Hak-Joon; Song, Sung‐Jin

doi:10.1007/s12206-015-0910-7

Cited by 11 publications

(3 citation statements)

References 10 publications

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“…The determination of the electrophysical parameter profiles involves the consideration and use of the forward and inverse problems in combination. The Uzal-Cheng-Dodd-Deeds electrodynamic model [8]- [11] of the direct problem in the analytical form used in this research was created under the following assumptions: MROs are characterised by infinite overall dimensions, the medium is assumed to be linear, homoge-neous, and isotropic; the electromagnetic field is excited by an ECP generator coil with a sinusoidal current I varying with an angular frequency ω = 2•π•f; the ECP excitation coil has a rectangular cross-section with finite dimensions, is characterised by a uniform current density across the crosssection i 0 and the number of turns W; the measuring coil has a number of turns w mes and an infinite small cross-section. Usually, the sub-surface zone of the MRO to simulate the continuity of the electrophysical parameter profiles is assumed to be conditionally multilayer.…”

Section: Methodsmentioning

confidence: 99%

Reconstruction of Electrophysical Parameter Distribution During Eddy Current Measurements of Structural Features of Planar Metal Objects

Halchenko,

Trembovetska,

Tychkov

et al. 2024

Latvian Journal of Physics and Technical Sciences

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The paper proposes a method of simultaneous reconstruction of the electrical conductivity and magnetic permeability profiles of planar metal research objects based on the results of single measurements by eddy current probes using surrogate optimization techniques in a reduced compact subspace design and accumulating the full amount of the most important a priori information about the modes of electromagnetic objects. In addition to the information on the response of probe signals to changes in electrophysical parameters, a priori information includes the data on multifrequency sensing and changes in the lift-off between metal research objects and eddy current probes. All the main stages for the implementation of the method of solving the inverse problem are demonstrated, namely, creating a uniform computer quasi-design of the experiment with improved 2D-projections based on LPτ-Sobol’s sequences; creating surrogate models on fully connected deep neural networks; reducing the dimensionality of the full design space using the principal components method of PCA; reconstructing profiles as a result of surrogate optimisation in a compact subspace. Numerical examples of the method are also presented in the paper.

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Section: Methodsmentioning

confidence: 99%

Reconstruction of Electrophysical Parameter Distribution During Eddy Current Measurements of Structural Features of Planar Metal Objects

Halchenko,

Trembovetska,

Tychkov

et al. 2024

Latvian Journal of Physics and Technical Sciences

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“…The nondestructive evaluation techniques used for the qualification, inspection, and safety of riveted structures in the aeronautical sector are required to meet very high standards of reliability and, consequently, to provide a much higher level of performance for improved detection capability [5][6][7]. An approach based on the estimation of the probability of detection has become an indispensable tool for researchers for a good evaluation of the used nondestructive testing techniques performances.…”

Section: Ndt Modelling and Pod Curve Generationmentioning

confidence: 99%

A Model Assisted Probability of Detection Approach for Ecndt of Hidden Defect in Aircraft Structures

Chebout¹,

Azizi²,

Mekideche³

2021

PIER Letters

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In a probabilistic approach, the performance of the control is characterized by statistical indicators such as the Probability of Detection (PoD) which describes the probability of detecting a defect of a given size knowing that it is present in the inspected structure. In this paper, an experimental analysis and simulation using FEM of the eddy current testing on three-dimensional riveted structure is performed on small fatigue cracks to identify and quantify probability of detection curves. The PoD curves are plotted in terms of characteristic dimensions of the defect (depth, length, orientation, etc.) and are dependent on a number of factors including material, geometry, defect type, operator, and environmental effects.

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“…The key parameters of the induction brazing process are related with the physics of the materials, their reaction to the electromagnetic energy, and the relation between material properties and the temperature change. To define the process properly, we have to consider the following basic parameters [4][5][6][7]:…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Modeling and Thermal Analysis of a Non-Axisymmetric System for Induction Brazing

2020

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The electromagnetic process happening between an induction brazing coil and the brazing assembly was studied and is described in the following pages. Using the tools of numerical analysis, we managed to achieve 3-D simulation of the process, which includes presentation of the magnetic field, thermal heat transfer, and time dependence. The results presented are considered for two of commonly used materials—copper and stainless steel in the shape of pipes. The induction brazing coil is a complex C-shape to match with the real industrial practices. The results obtained from the model are in accordance with the experimental results, as in both the model and the experiment, the required temperature was reached in about 6 s. It was found that during the brazing process, the inductance of the winding increases by about 4 nH and the resistance by 1.5 mΩ, which is important for the coordination of the power supply.

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Analytical approaches to eddy current nondestructive evaluation for stratified conductive structures

Cited by 11 publications

References 10 publications

Reconstruction of Electrophysical Parameter Distribution During Eddy Current Measurements of Structural Features of Planar Metal Objects

Reconstruction of Electrophysical Parameter Distribution During Eddy Current Measurements of Structural Features of Planar Metal Objects

A Model Assisted Probability of Detection Approach for Ecndt of Hidden Defect in Aircraft Structures

Electromagnetic Modeling and Thermal Analysis of a Non-Axisymmetric System for Induction Brazing

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