R. Kim Murphy
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View article: Distinguishing cracks and non-metallic inclusions using eddy current nondestructive evaluation and model-based inversion
Distinguishing cracks and non-metallic inclusions using eddy current nondestructive evaluation and model-based inversion Open
Recent work has demonstrated the capability of applying inverse methods to automated eddy current (EC) data of surface breaking cracks and notches of various sizes, orientations and aspect ratios. However, not all eddy current indications …
View article: Model-based probe state estimation and crack inverse methods addressing eddy current probe variability
Model-based probe state estimation and crack inverse methods addressing eddy current probe variability Open
A model-based calibration process is introduced that estimates the state of the eddy current probe. First, a carefully designed surrogate model was built using VIC-3D® simulations covering the critical range of probe rotation angles, tilt …
View article: Advanced model of eddy-current NDE inverse problem with sparse grid algorithm
Advanced model of eddy-current NDE inverse problem with sparse grid algorithm Open
In model-based inverse problem, some unknown parameters need to be estimated. These parameters are used not only to characterize the physical properties of cracks, but also to describe the position of the probes (such as lift off and angle…
View article: Flaw characterization using inversion of eddy current response and the effect of filters and scan resolution
Flaw characterization using inversion of eddy current response and the effect of filters and scan resolution Open
The objective of this work is to expand eddy current inversion methods to enable estimation of flaw dimensions and orientations for data collected using a variety of scan resolutions and filter configurations. Prior work [1, 2] has demonst…
View article: Advances in electromagnetic models for three-dimensional nondestructive evaluation of advanced composites
Advances in electromagnetic models for three-dimensional nondestructive evaluation of advanced composites Open
In past work we have developed a rigorous electromagnetic model and an inversion algorithm for the three-dimensional NDE of advanced composite materials. This approach extends Victor Technologies' work in eddy-current NDE of conventional m…
View article: Eddy-current NDE inverse problem with sparse grid algorithm
Eddy-current NDE inverse problem with sparse grid algorithm Open
In model-based inverse problems, the unknown parameters (such as length, width, depth) need to be estimated. When the unknown parameters are few, the conventional mathematical methods are suitable. But the increasing number of unknown para…
View article: Nondestructive damage characterization of complex aircraft structures by inverse methods: Advances in multiscale models
Nondestructive damage characterization of complex aircraft structures by inverse methods: Advances in multiscale models Open
The use of coupled integral equations and anomalous currents allows us to efficiently remove 'background effects' in either forward or inverse modeling. This is especially true when computing the change in impedance due to a small flaw in …
View article: Model-based inverse methods for sizing surface-breaking discontinuities with eddy current probe variability
Model-based inverse methods for sizing surface-breaking discontinuities with eddy current probe variability Open
The objective of this work is to demonstrate and validate model-based inversion techniques to characterize length, depth, width and orientation of surface-breaking cracks using eddy current NDE under varying probe conditions. A series of p…