A Fuzzy Learning Approach for Identification of Arbitrary Crack Profiles Using ACFM Technique

Noroozi, Amin; Hasanzadeh, Reza P. R.; Ravan, Maryam

doi:10.1109/tmag.2013.2254718

Cited by 36 publications

(12 citation statements)

References 32 publications

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“…ACFM technique has been originally used in detections of surface cracks in oil and gas industry in previous decades [8][9]. It is capable of inspecting the crack geometries (e.g., depth and length) with high accuracy and elimination of lift-off effects [10][11][12][13]. Besides, it enables the sensor probe to detect the surface cracks of metals without removing the coatings.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of Coil-Crack Angle Sensitivity Effect Using a Novel Flux Feature of ACFM Technique

Huang¹,

Lü²,

Chen³

et al. 2021

Preprint

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Alternating current field measurement (ACFM) testing is one of promising techniques in the field of non-destructive testing with advantages of the non-contact capability and the reduction of lift-off effects. In this paper, a novel crack detection approach is proposed to reduce the effect of the angled crack (cack orientation) by using rotated ACFM techniques. The sensor probe is composed of an excitation coil and two receiving coils. Two receiving coils are orthogonally placed in the centre of the excitation coil where the magnetic field is measured. It is found that the change of the x component and the peak value of the z component of the magnetic field when the sensor probe rotates around a crack follows a sine wave shape. A customised accelerated finite element method solver programmed in MATLAB is adopted to simulate the performance of the designed sensor probe which can significantly improve the computation efficiency due to the small crack perturbation. The experiments have also been carried out to validate the simulations. It is found that the ratio between the z and x components of the magnetic field remains stable under various rotation angles. It shows the potential to estimate the depth of the crack from the ratio detected by combining the magnetic fields from both receiving coils (i.e., the x and z components of the magnetic field) using the rotated ACFM technique.

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Section: Introductionmentioning

confidence: 99%

“…However, the accuracy of depth prediction depends on the level of noise from the measurement data [22]. Fuzzy rules are also popularly applied in the identification of the crack [12,[23][24]. Noroozi et al utilised the fuzzy alignment algorithm (FAA) to effectively map the depth of the crack to the signal output from the probe.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Coil-Crack Angle Sensitivity Effect Using a Novel Flux Feature of ACFM Technique

Huang¹,

Lü²,

Chen³

et al. 2021

Preprint

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“…In eddy-current testing, the air-cored coil (Fig. 1) is commonly used for the measurement of: material thickness [1][2][3], magnetic permeability [4][5][6], electrical conductivity [7,8], calculations of magnetic field [9,10], or in a fuzzy logic approach [11][12][13][14]. In mathematical models, the geometric dimensions of the air-cored coil are usually determined by the means of four parameters: inner radius r 1 , outer radius r 2 , lower height h 1 , and upper height h 2 (Fig.…”

Section: Introductionmentioning

confidence: 99%

Fast Method of Calculating the Air-Cored Coil Impedance Using the Filamentary Coil Model

Tytko¹

2020

PIER M

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This paper presents a method for calculating the air-cored coil impedance with the employment of a mathematical model of an ideal filamentary coil. The proposed algorithm enables assigning, in a very quick way, each cylindrical air-cored coil to the corresponding filamentary coil using only two equivalent parameters. The first of them is the radius of the coil, whereas the second one is the distance between the coil and the surface of the tested material. The changes both in the parameters of the system under consideration and in the tested material bring about the same change in the impedance of the air-cored coil and the corresponding filamentary coil. This property brings a lot of advantages, since it allows using simpler final formulas for the filamentary coil and performing the calculations in a much shorter time, while obtaining the same results as in the case of the air-cored coil. At the same time, the creation of the scale of the measuring instrument and its calibration becomes far simpler since it is based on only two equivalent parameters.

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“…In this model, the current induced by an excitation coil wound on the yoke (ACFM probe) is disturbed in the presence of a crack, which makes the magnetic field distorted. The component of the magnetic field in the X direction (Bx) shows a deep trough, which decreases as the crack depth increases, and the component of the magnetic field in the Z direction (Bz) produces negative and positive peaks at the ends of the crack [4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Induced circumferential current for transverse crack detection on a pipe string

Li¹,

Yuan²,

Chen³

et al. 2015

Insight

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Alternating current field measurement (ACFM) has been proven to be a promising technique for detecting and sizing surface cracks using an induced current. Due to the confined induced current region, the induced current cannot bypass long and narrow transverse cracks on a pipe string, which makes the conventional ACFM method insensitive to transverse cracks. In this paper, a broad full 360º circumferential current induced by a novel feed-through ACFM probe is presented for detecting transverse cracks on a pipe string effectively. The distortion of the circumferential current and characteristic signals of a transverse crack are analysed by both simulations and experiments. Our results show that the induced circumferential current is disturbed by a transverse crack on the surface of the pipe string. Characteristic signals obtained from the distorted space magnetic field associated with the disturbed circumferential current can be used to evaluate a small opening transverse crack. The results indicate that the induced circumferential current can be employed to detect small opening transverse cracks on a pipe string effectively.

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A Fuzzy Learning Approach for Identification of Arbitrary Crack Profiles Using ACFM Technique

Cited by 36 publications

References 32 publications

Reduction of Coil-Crack Angle Sensitivity Effect Using a Novel Flux Feature of ACFM Technique

Reduction of Coil-Crack Angle Sensitivity Effect Using a Novel Flux Feature of ACFM Technique

Fast Method of Calculating the Air-Cored Coil Impedance Using the Filamentary Coil Model

Induced circumferential current for transverse crack detection on a pipe string

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