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**1 - 7**of**7**### DOI: 10.1784/insi.2009.51.1.32 MFL Application of 3-D FEM in the simulation analysis for MFL signals

, 2008

"... The analysis of the magnetic flux leakage (MFL) signals is the basis of MFL testing. The magnetic flux leakage (MFL) of defects in pipes is simulated by using a three-dimensional (3-D) finite element method (FEM). The 3-D FEM model is built on the principle of magnetic flux leakage (MFL) testing. Th ..."

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The analysis of the magnetic flux leakage (MFL) signals is the basis of MFL testing. The magnetic flux leakage (MFL) of defects in pipes is simulated by using a three-dimensional (3-D) finite element method (FEM). The 3-D FEM model is built on the principle of magnetic flux leakage (MFL) testing. The distribution of magnetic flux density is obtained. The relationship between defect geometry parameter and MFL signals is discussed in detail; the influence of path station lift-off value and intensity of magnetisation is also studied in this paper. It is the basis for optimising the design of the magnetic detecting equipment and the quantitative testing of MFL.

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"... Analysis, modeling and numerical simulation of complex plasmas under microgravity conditions ..."

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Analysis, modeling and numerical simulation of complex plasmas under microgravity conditions

### EFFECTS OF THERMAL AND ELECTRICAL PROPER- TIES OF THIN METAL FILM IN PHOTOINDUCTIVE FIELD-MAPPING TECHNIQUE FOR EDDY-CURRENT PROBES

"... Abstract—Photoinductive (PI) field mapping for eddy-current (EC) probes above a thin metal film was performed by multiphysics analysis with two-dimensional finite element method (FEM). The FEM model of PI method was used to observe how metal film properties affect the field-mapping signals of EC pro ..."

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Abstract—Photoinductive (PI) field mapping for eddy-current (EC) probes above a thin metal film was performed by multiphysics analysis with two-dimensional finite element method (FEM). The FEM model of PI method was used to observe how metal film properties affect the field-mapping signals of EC probes. The PI signal was tested for effects of resistivity, temperature coefficient of the resistivity, thermal conductivity, heat capacity, and thin film density The applicability of actual thin film materials for mapping the field of EC probe when using PI method was discussed. Field-mapping signals of EC probe coils with tilt angles of 0 ◦ , 5 ◦ , 10 ◦ , 15 ◦ , and 20 ◦ were also examined with appropriate metal film material. These experiments showed that the higher-resolution field-mapping signals of EC probes can be obtained by given a titanium thin film The resolution of field-mapping signals of EC probes correlated positively with resistivity, heat capacity, and density of thin film and correlated negatively with its thermal conductivity. Improved understanding of distinct field distribution of EC probes enables selection of optimal probes for EC inspection. 1.

### Determination of electromagnetic cavity modes using the Finite Difference Frequency-Domain Method

, 2010

"... In this communication we propose a numerical determination of the electromagnetic modes in a cavity by using the Finite Difference Frequency-Domain Method. We first derive the analytical solution of the system and subsequently we introduce the numerical approximation. The cavity modes are obtained b ..."

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In this communication we propose a numerical determination of the electromagnetic modes in a cavity by using the Finite Difference Frequency-Domain Method. We first derive the analytical solution of the system and subsequently we introduce the numerical approximation. The cavity modes are obtained by solving an eigenvalue equation where the eigenvectors describe the eigenfunctions on the real space. It is found that this finite difference method can efficiently and accurately determine the resonance modes of the cavity with a small amount of numerical calculation.

### RESEARCH ON QUANTITATIVE METHOD AND 3D FINITE ELEMENT ANALYSIS OF TANK BOTTOM CORROSION DEFECT LEAKAGE MAGNETIC FIELD

"... According to the principle of magnetic flux leakage testing and the finite element numerical simulation, 3D finite element model(FEM) for MFL testing of tank bottom was established. Through simulative analysis, influence law between defect size and defect magnetic flux leakage field and the relation ..."

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According to the principle of magnetic flux leakage testing and the finite element numerical simulation, 3D finite element model(FEM) for MFL testing of tank bottom was established. Through simulative analysis, influence law between defect size and defect magnetic flux leakage field and the relationship curve of defect leakage magnetic field change with its size was obtained. The result showed that: When the length vary with sequence, the peak valley length of defects leakage magnetic signal increase with the increase of defect length, the relationship curve between each other is approximate linear; When the depth vary with sequence, the relationship between peak valley height of defects leakage magnetic signal and defect depth is also approximate linear, but this relationship was different with different length; When the width vary with sequence, on the defect symmetry plane, the peak of magnetic flux density along the width direction corresponded with the defect edge, and the length of the two peaks were equal to the width of the defect. According to simulation data and theory of regression analysis linear regression equation and relation surface between defect length depth and the characteristic quantity of its signal was established, quantitative method of defects signal was also proposed. Then experimental study was carried out in the Laboratory, the result show that the quantitative size was consistent with the actual defect size.

### Article A Computational Model for Path Loss in Wireless Sensor Networks in Orchard Environments

, 2014

"... www.mdpi.com/journal/sensors ..."

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