Eddy current evaluation of air–gaps in aeronautical multilayered assemblies using a multi-frequency behavioral model

Cung, Thanh Long; Joubert, P.; Vourch, E.

doi:10.1016/j.measurement.2011.03.012

Cited by 10 publications

(9 citation statements)

References 15 publications

(19 reference statements)

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“…Based on the linear relationship [equation (2)], it is possible to determine the air-gap thickness t a . As presented in the work by Cung et al (2011), to verify this relationship and evaluate the inversion result, we built a reference database by simulating the interactions between the sensor and the layered assemblies, using finite element modelling. In this paper, we use the same database to develop another approach for the estimation of air-gap thickness.…”

Section: Experimental Setup and Problem Formulationmentioning

confidence: 99%

A model-based approach for inspection of aeronautical multi-layered structures by eddy currents

Cung

Nguyen

Joubert

et al. 2019

COMPEL

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Purpose The purpose of this paper is to propose an approach, which is easy to implement, for estimating the thickness of the air layer that may separate metallic parts in some aeronautical assemblies, by using the eddy current method. Design/methodology/approach Based on an experimental study of the coupling of a magnetic cup core coil sensor with a metallic layered structure (consisting of first metal layer/air layer/second metal layer), which is confirmed by finite element modelling simulations, an inversion technique relying on a polynomial forward model of the coupling is proposed to estimate the air layer thickness. The least squares and the nonnegative least squares algorithms are applied and analysed to obtain the estimation results. Findings The choice of an appropriate inversion technique to optimize the estimation results is dependent on the signal-to-noise ratio of measured data. The obtained estimation error is smaller than a few percent, for both simulated and experimental data. The proposed approach can be used to estimate both the air layer thickness and the second metal layer thickness simultaneously/separately. Originality/value This model-based approach is easy to implement and available to all types of eddy current sensors.

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Section: Experimental Setup and Problem Formulationmentioning

confidence: 99%

A model-based approach for inspection of aeronautical multi-layered structures by eddy currents

Cung

Nguyen

Joubert

et al. 2019

COMPEL

Self Cite

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“…It allows characterizing defects [1][2][3] or evaluating physical parameters under certain conditions 4,5 with sufficient accuracy. However, it is still an "ill-posed" problem and limited in applications 6,7 due to the difficulty of feature extraction and the complex of algorithm of inverse problem solution.…”

Section: Introductionmentioning

confidence: 99%

A model-based approach for estimation of the crack depth on a massive metal structure

Cung

Dao

Nguyen

et al. 2018

Measurement and Control

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This paper deals with the eddy current technique for nondestructive evaluation of the crack depth on a massive specimen used in aeronautical industry. A set of C-scan eddy current images is analyzed to reduce the noise and to select suitable features, which can be used to estimate the crack depth. Based on this study, a method relying on polynomial forward models of the relationship between crack depth and the maximum value of the sensor impedance is proposed. The least square and the non-negative least square techniques are applied to analyze the usability of proposed models. The error of obtained estimations is smaller than 10%, for almost used experimental data.

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“…In recent years, there has been a large demand for analytical models of Eddy Current (EC) probes to meet life management requirements of layered conductive structures in aging nuclear, aerospace and petrochemical infrastructure components [1,2,3]. The widely-used model developed by Dodd and Deeds [4,5,6,7] is generally implemented as a theoretical basis for modeling EC problems [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The widely-used model developed by Dodd and Deeds [4,5,6,7] is generally implemented as a theoretical basis for modeling EC problems [1,2,3]. However, Dodd and Deeds' [4,5,6,7] model is only valid for open-circuit pickup coils and a constant amplitude sinusoidal drive coil current [2,8].…”

Section: Introductionmentioning

confidence: 99%

Examination of Dodd and Deeds solutions for a transmit-receive eddy current probe above a layered planar structure

Luloff¹,

Morelli²,

Krause³

2017

AIP Conference Proceedings

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Abstract. Exact solutions for the electromagnetic response of a transmit-receive coil pair situated above two parallel plates separated by a gap, were developed using the recently published general model of Desjardins et al. that accounts for all electromagnetic interactions between the voltage-driven probe and the conducting samples. This model was then compared to the well-known model developed by Dodd and Deeds, which assumes a constant amplitude sinusoidal current and an open-circuit pick-up coil. Both models were compared with experimental results that measured the gap -materials simulated the electromagnetic properties of a Zr 2.5% Nb pressure tube and Zr-2 calandria tube, respectively, as found in the fuel channels of CANDU ® reactors. It was observed that while the Dodd and Deeds' model as applied to this work achieved a good shape agreement with experimental data for excitation frequencies at 2 kHz, at the higher frequency of 16 kHz good agreement was not achieved. In contrast, the model of Desjardin's et al., adapted for a transmitreceive probe configuration above two infinite flat plates, achieved an excellent shape agreement at both frequencies.

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Eddy current evaluation of air–gaps in aeronautical multilayered assemblies using a multi-frequency behavioral model

Cited by 10 publications

References 15 publications

A model-based approach for inspection of aeronautical multi-layered structures by eddy currents

A model-based approach for inspection of aeronautical multi-layered structures by eddy currents

A model-based approach for estimation of the crack depth on a massive metal structure

Examination of Dodd and Deeds solutions for a transmit-receive eddy current probe above a layered planar structure

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