TEAM problem 15 - A Problem in Nondestructive Evaluation

This example demonstrates how MagNet can be used for your NDT/NDE sensor problems. In TEAM problem 15 "Rectangular Slot in A Thick Plate: a Problem in Nondestructive Evaluation", a circular coil moves along an aluminum plate that contains a slot. The goal of this application is to detect the slot by calculating the resistance and inductance of the driving coil at various positions.

Sensor problems require accurate calculation of induced eddy currents in order to detect flaws in samples. MagNet's Time Harmonic solver automatically calculates eddy currents. Comparing published experimental results with MagNet shows the accuracy of the software

A complete definition of this TEAM problem can be found here. TEAM is an acronym for Testing Electromagnetic Analysis Methods, which is a community that creates benchmarks to test finite element analysis software.


Results

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The graph on the right shows the comparison of inductances between those calculated in MagNet and the experimental values.

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The calculation of resistances at the various coil positions is compared to the published experimental results in the graph on the right.

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Features in Magnet

All of Infolytica's software packages allow for easy manipulation of the finite element mesh that is used to calculate electromagnetic fields. When using the graphical interface in our products it is possible to specify mesh sizes specifically on bodies, surfaces, edges and vertices. This allows the user to quickly and easily create meshes as seen on the right.

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MagNet's post-processing allows the user to immediately retrieve important results for further analysis. In the snapshot on the right, after the Time Harmonic solve is complete, the user can instantly find out what the voltage is in the driving coil.

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In applications, where many solutions are required due to changing parameters (such as current, voltage, position, conductivities, frequency, etc.) Infolytica's software becomes a logical choice because of its ease of use. In TEAM problem 15, the driving coil is required to move along the aluminum plate to sense the flaw. This is done in the software by setting one parameter as seen on the right.