scholarly journals Extended Damage Detection and Identification in Aircraft Structure Based on Multifrequency Eddy Current Method and Mutual Image Similarity Assessment

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4452
Author(s):  
Tomasz Chady ◽  
Krzysztof Okarma ◽  
Robert Mikołajczyk ◽  
Michał Dziendzikowski ◽  
Piotr Synaszko ◽  
...  
Keyword(s):  
Image Quality ◽  
Eddy Current ◽  
Image Quality Assessment ◽  
Current Method ◽  
General Purpose ◽  
Reference Image ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Detection And Identification ◽  
Novel Approach

In this paper, a novel approach to Non-Destructive Testing (NDT) of defective materials for the aircraft industry is proposed, which utilizes an approach based on multifrequency and spectrogram eddy current method combined with an image analysis method previously applied for general-purpose full-reference image quality assessment (FR IQA). The proposed defect identification method is based on the use of the modified SSIM4 image quality metric. The developed method was thoroughly tested for various locations, sizes, and configurations of defects in the examined structure. Its application makes it possible to not only determine the presence of cracks but also estimate their size.

scholarly journals Non–Destructive Testing of Conductive Material by Eddy Current Air Probe Based on Swept Frequency

2015 ◽  
Vol 66 (3) ◽  
pp. 174-177 ◽  
Author(s):  
Andrea Štubendeková ◽  
Ladislav Janoušek
Keyword(s):  
Numerical Model ◽  
Eddy Current ◽  
Current Method ◽  
Wide Frequency Range ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Exciting Coil ◽  
Non Destructive ◽  
2D Numerical Model

Abstract This article deals with non-destructive testing of conductive materials by eddy current method based on swept frequency. A 2D numerical model of eddy current air-core probe was created in the LTspice software at first. The probe consists of two coils: exciting coil and receiving. The probe is positioned in air in this case. Experimental and calculated frequency responses of the probe are obtained within a wide frequency range using swept frequency in order to validate the model. Frther a 3D model used for non-destructive testing of austenitic steel plate with three electro-discharge machined notches is then developed accordingly. Results of measurement are compared with 3D numerical model using COMSOL Multiphysics software.

scholarly journals Use of non-destructive eddy current technique to detect simulated corrosion of aircraft structures

2020 ◽  
Vol 64 (2) ◽  
pp. 52-58
Author(s):  
M. Janovec ◽  
J. Čerňan ◽  
F. Škultéty
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Experimental Sample ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Aircraft Structures ◽  
Aluminum Sheets ◽  
Riveted Joints ◽  
Non Destructive

AbstractThe article deals with the issue of non-destructive testing of riveted joints. In the article, the authors used a non-destructive eddy current array technique, which was applied to detect simulated corrosion in the field of aircraft riveted joints of aluminum sheets. In aircraft maintenance, the eddy current method is used to control the outer surface of the aircraft skin, especially the areas around the riveted joints. This method makes it possible to detect hidden cracks and corrosion that may occur during aircraft operation. Especially hidden are hidden cracks and corrosion of aircraft structures, which cannot be detected during a visual inspection of the aircraft. The aim of the experimental measurements was to reveal simulated corrosion in the area of riveted joints formed on the experimental sample. Corrosion was simulated by gluing aluminum powder to the surface of the aluminum sheets from which the sample was made. The simulated corrosion in the second and third layers of the riveted sample was reliably detected. The settings, the method of control and the results of measurements are given in the article in the experimental part and the results of measurements. Measurements were performed using a defectoscope with an ECA measurement module, with appropriate measuring probes suitable for this type of inspection.

Eddy Current Examination of Fatigue Cracks in Inconel Welds

2006 ◽  
Vol 129 (1) ◽  
pp. 169-174 ◽  
Author(s):  
Weiying Cheng ◽  
Ichiro Komura ◽  
Mitsuharu Shiwa ◽  
Shigeru Kanemoto
Keyword(s):  
Eddy Current ◽  
Nuclear Power ◽  
Power Plants ◽  
Base Alloy ◽  
Fatigue Cracks ◽  
Current Method ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Nickel Base ◽  
Basic Studies

Basic studies on the eddy current examination of defects in Inconel, a typical nickel-base alloy used in the reactor vessel, pressurizer, and core internal of nuclear power plants, are carried out. The detecting and sizing capability of the eddy current method is investigated through analytical and experimental approaches. Probe’s detectability is numerically evaluated, and appropriate probe and examination conditions are correspondingly selected. The numerical signal calculation and crack reconstruction approach is confirmed in terms of the study of the eddy current examination of electrodischarge machining notches in Inconel base metal, and further applied to eddy current examination of fatigue cracks in Inconel welds. The profiles of fatigue cracks are reconstructed using eddy current testing signals. Crack depths estimated by eddy current reconstruction agree well with that of ultrasonic testing and are consistent with the crack depths revealed from destructive testing. The research presented in this paper shows that by choosing a proper testing situation, eddy current examination is feasible for detecting and sizing of surface-breaking cracks in Inconel welds.

scholarly journals Non-destructive testing of Al-Mg alloys by using the eddy-current method

2017 ◽  
Vol 106 ◽  
pp. 03007 ◽  
Author(s):  
Sergey Dmitriev ◽  
Alexey Ishkov ◽  
Alexander Katasonov ◽  
Vladimir Malikov ◽  
Anatoly Sagalakov
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Mg Alloys ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Non Destructive ◽  
Al Mg Alloys

Entirely Blind Image Quality Assessment Estimator

2014 ◽  
Vol 543-547 ◽  
pp. 2496-2499
Author(s):  
Abdalmajeed Saifeldeen ◽  
Shu Hong Jiao ◽  
Wei Liu
Keyword(s):  
Image Quality ◽  
Quality Assessment ◽  
Prior Knowledge ◽  
Image Quality Assessment ◽  
Signal To Noise Ratio ◽  
Structural Similarity ◽  
General Purpose ◽  
Reference Image ◽  
Natural Image ◽  
Natural Scenes

Prior knowledge about anticipated distortions and their corresponding human opinion scores is needed in the most general purpose no-reference image quality assessment algorithms. When creating the model, all distortion types may not be existed. Predicting the quality of distorted images in practical no-reference image quality assessment algorithms is devised without prior knowledge about images or their distortions. In this study, a blind/no-reference opinion and distortion unaware image quality assessment algorithm based on natural scenes is developed. The proposed approach uses a set of novel features to measure image quality in a spatial domain. The extracted features which are from the scenes gist are formed using Weibull distribution statistics. When testing the proposed algorithm on LIVE database, experiments show that it correlates well with subjective opinion scores. They also show that the proposed algorithm significantly outperforms the popular full-reference peak signal-to-noise ratio (PSNR) and structural similarity (SSIM) methods. Not only do the results reasonably well compete with the recently developed natural image quality evaluator (NIQE) model, but also outperform it.

scholarly journals Gas Leakage Detection in Pipeline by SVM classifier with Automatic Eddy Current based Defect Recognition Method

2021 ◽  
Vol 3 (3) ◽  
pp. 196-212
Author(s):  
R. Rajesh Sharma
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Processing Technique ◽  
Industrial Safety ◽  
Image Processing Technique ◽  
Svm Classifier ◽  
Eddy Current Method ◽  
Gas Leakage ◽  
Detection And Identification ◽  
Wide Range

It's well-known that industrial safety is now a top concern. Nowadays, accidents caused by flammable gases occur frequently in our everyday lives. Gas cylinders, which are used for household purposes, wide range of businesses, and vehicles are often reported to be on the verge of exploding. Explosions have left a large number of individuals seriously wounded or could also be lethal in certain cases. This project's goal is to use a HOG features for SVM classifier which is used to identify pipeline gas leaks and keep tabs on them. In addition, the system utilises an image processing technique to identify pipeline fractures. Early detection and identification of pipeline flaws is a predominant aspect of this study. According to the suggested design, the robot capture the image down the pipe, looking for any signs of gas leakage by the Eddy Current method. This type of recognition has proved superior to other traditional methods. The methods with efficiency parameters and the results were compared and are tabulated in the results section. In the future, the data in the course of detection could be sent through GSM to a mobile application.

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