Optimization of the magnetic circuit in the MFL inspection system for storage-tank floors |
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Authors: | Song Xiao-chun Huang Song-ling Zhao Wei |
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Affiliation: | (1) State Key Lab of Power Systems, Department of Electrical Engineering, Tsinghua University, 100084 Beijing, China;(2) College of Mechanical Engineering, Hubei University of Technology, 430068 Wuhan, China |
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Abstract: | Magnetization is the key to inspection of a tank floor via the magnetic-flux-leakage (MFL) technique. In order to optimize
the magnetic circuit of the MFL detector and obtain the best detection effects, the influences of the magnet size on the floor
magnetization condition, the gap magnetic flux density, and the magnetic force were studied with the help of the finite element
method (FEM) and the effects of some other parameters, such as the magnet pole spacing and pole-piece thickness, on the signal-to-noise
ratio were analyzed. The simulation results indicate that variation of the magnet width affects the magnetization much more
than variation of the magnet thickness and that the detector can reach a trade-off between the magnetization effects and the
driving force when the magnet is about 30 mm thick and 40 mm wide. On condition that the floor has reached its magnetizing
saturation, an increase in the magnet-pole spacing and the pole-piece thickness can improve the testing sensitivity and the
signal-to-noise ratio.
The text was submitted by the authors in English. |
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