Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Magnetic Flux Leakage"”.
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Understanding Magnetic Flux Leakage from Gouges and Dents Containing Gouges
Magnetic flux leakage (MFL) is the most widely used non-destructive evaluation (NDE) technique for operating gas and oil transmission pipelines. The Queen’s Applied Magnetics Group (AMG) has been studying MFL signals from dents for the past 5 years, and recently began considering MFL signals from …
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Effect of debris-induced lift-off on magnetic flux leakage inspection results
… potential to cause debris-induced lift-off in magnetic flux leakage inspection tools. A test apparatus was developed to qualitatively examine the effect of debris-induced lift-off.;The results of this research indicate that debris-induced lift-off has a detrimental effect on magnetic flux …
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Enhanced Magnetic Flux Leakage Analysis of the Distribution of Flux and The Effects of Velocity of Mild Steel Plates
… the velocity effects of a permanent magnet based magnetic flux leakage system. Both experimental and finite element analysis methods have been utilised to undertake a parametric study of the velocity effects on the induced flux and its distribution in plate thicknesses of 6mm through to 20mm thick …
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Design of miniature mobile robots for non-destructive evaluation
… (NDE) of engineering structures, enabling magnetic (flux leakage and eddy current), ultrasonic and visual techniques in a complementary fashion. Particular emphasis is placed on the design of the miniature autonomous climbing vehicles, the Eddy Current and Magnetic Flux Leakage payload, the …
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Bayesian calibration of in-line inspection tool tolerance
Calibration of Magnetic Flux Leakage (MFL) In-line Inspection (ILI) tools is an important part of the overall pipeline integrity management process. Over-called or under-called corrosion features can have significant impacts on safety and resource management. This thesis examines methods for …
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Multi-sensor data fusion using geometric transformations for the nondestructive evaluation of gas transmission pipelines
… from the NDE of a test specimen suite using magnetic flux leakage, ultrasonic and thermal imaging methods. The results presented in this thesis indicate that neural network based geometric transformation algorithms show considerable promise in multi-sensor data fusion applications.</p>
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An invariance transformation algorithm for defect characterization of ultrasonic signals for the nondestructive evaluation of concrete
… experimental data from two separate NDT sources, magnetic flux leakage (MFL) testing of metal gas pipeline specimens and ultrasonic testing (UT) of concrete wastewater pipeline specimens. A selection of three papers is provided describing the invariant defect characterization technique. The …
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Development of a Magnetic Field Sensor System for Nondestructive Evaluation of Reinforcing Steel in Prestressed Concrete Bridge Members
… strands for load rating. This thesis presents a magnetic inspection system to measure main magnetic flux (MMF) and magnetic leakage flux (MFL) signals, to evaluate the condition of prestressing stands. A proof-of-concept has been established using a prototype electromagnet-sensor, showing a …