Estimation of reflection and transmission coefficients with finite element method

2002 ◽  
Vol 6 (3) ◽  
pp. 359-364 ◽  
Author(s):  
Woo Chang Jeong ◽  
Yong Sik Cho
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reflection And Transmission Coefficients ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Element Method

scholarly journals Determination Reflection and Transmission Coefficients of Lanthanum Iron Garnet Filled PVDF-Polymer Nanocomposite Using Finite Element Method Modeling at Microwave Frequencies

2012 ◽  
Vol 21 ◽  
pp. 151-157 ◽  
Author(s):  
Hasan Soleimani ◽  
Noorhana Yahya ◽  
Zulkifly Abbas ◽  
Hojjatollah Soleimani ◽  
Hasnah Mohd Zaid
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rectangular Waveguide ◽  
Polymer Nanocomposite ◽  
Reflection And Transmission Coefficients ◽  
Fem Modeling ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Iron Garnet ◽  
Element Method

In our previous work, the lanthanum iron garnet-filled PVDF-polymer nanocomposite has been prepared. The reflection and transmission coefficients of PVDF/LIG were measured using rectangular waveguide in conjunction with a microwave vector network analyzer (VNA) at X-band frequencies (8 GHz - 12 GHz). In this study, the distribution of electric field intensity of PVDF/ LIG which was loaded in rectangular waveguide was simulated based on Finite Element Method (FEM) formulation to show the essential differences of intensity of emitted electrical field. The computations of reflection and transmission coefficients of PVDF/ LIG were determined by using implementation FEM modeling rectangular waveguide. The FEM results were compared with the experimental achievement results using the rectangular waveguide. An excellent agreement between measured and simulated results was obtained based on the values of mean relative errors.

Wave Diffusion Sensitivity to Angular Positions of Defects in Pipes

2015 ◽  
Vol 23 (03) ◽  
pp. 1550013 ◽  
Author(s):  
M. Kharrat ◽  
M. N. Ichchou ◽  
O. Bareille ◽  
W. Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Investigation ◽  
Crucial Role ◽  
Angular Position ◽  
Reflection And Transmission Coefficients ◽  
Steel Pipe ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Wave Diffusion

This paper provides a numerical investigation onto the effect of the angular position of a defect on the wave diffusion in a steel pipe. The wave finite element method (WFEM) is used to calculate reflection and transmission coefficients from defects with different angular positions as a function of frequency. The modeled defects are impinged successively by torsional T(0, 1), longitudinal L(0, 2) and flexural F(1, 2) modes. The wave diffusion in each case is examined leading to several important remarks. Results show that the choice of the incident mode as well as the studied reflected and transmitted modes play a crucial role in the circumferential localization of defects in pipes.

P-SV wave scattering by coal‐seam inhomogeneities

Geophysics ◽  
1985 ◽  
Vol 50 (2) ◽  
pp. 214-223 ◽  
Author(s):  
S. A. Edwards ◽  
M. W. Asten ◽  
L. A. Drake
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Coal Seam ◽  
Wave Scattering ◽  
Mode Conversion ◽  
Sufficient Information ◽  
Transmission Spectra ◽  
Reflection And Transmission ◽  
Dynamic Finite Element ◽  
Element Method

The dynamic finite‐element method is used to calculate the normal incidence P-SV guided‐wave scattering spectra of 124 models of coal‐seam obstructions commonly encountered in in‐seam seismology. The models are faults of varying throw and dip; thick faults with an associated region of fracturing; dikes of varying width, hardness, and dip; sills of varying hardness; stone rolls of varying height; and seam washouts. Reflection and transmission spectra including mode conversion are studied for incident fundamental symmetric P-SV seam modes. The dynamic finite‐element method is adapted to the calculation of scattering parameters through the consistent boundary condition of Lysmer and Waas. The results complement an earlier study of SH seam‐wave scattering. They show that faults reflect a much higher percentage of SH-wave energy than P-SV, but that P-SV-waves undergo substantially greater mode conversion on scattering from faults. Dikes exhibit thin film interferometric effects for both SH- and P-SV-waves. Sills do not reflect P-SV-waves substantially. Stone rolls cause conversion between symmetric and antisymmetric modes. From the results it is evident that reflection and transmission spectra contain sufficient information on the nature (not merely the existence) of a seam obstruction to justify further efforts in the design of in‐mine seismic observations aimed at allowing characterization as well as location of the obstruction. The names Evison wave and Krey wave are proposed and defined for guided SH-waves and P-SV-waves, respectively.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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