scholarly journals Experimental validation of a stable method of moments procedure in time domain for the scattering from arbitrarily shaped conducting bodies

Radio Science ◽  
2000 ◽  
Vol 35 (4) ◽  
pp. 923-931 ◽  
Author(s):  
Giuliano Manara ◽  
Agostino Monorchio
Keyword(s):  
Method Of Moments ◽  
Time Domain ◽  
Experimental Validation ◽  
Stable Method ◽  
Conducting Bodies

Experimental Validation of a Dynamic Simulation

1990 ◽  
Author(s):  
K. Harold Yae ◽  
Su-Tai Chern ◽  
Howyoung Hwang
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Simulation ◽  
Time Domain ◽  
Experimental Validation ◽  
Initial Conditions ◽  
Hydraulic Cylinder ◽  
Force Output ◽  
Inverse Dynamic ◽  
Inverse Dynamic Analysis ◽  
The Time Domain

Abstract Using forward and inverse dynamic analysis, the dynamic simulation of a backhoe has been compared with experiments. In the experiment, recorded were the configuration and force histories; that is, velocity and position, and force output from the hydraulic cylinder-all were measured in the time domain. When the experimental force history is used as driving force in the simulation, forward dynamic analysis produces a corresponding motion history. And when the experimental motion history is used as if a prescribed trajectory, inverse dynamic analysis generates a corresponding force history. Therefore, these two sets of motion and force histories — one set from experiment, and the other from the simulation that is driven forward and backward with the experimental data — are compared in the time domain. The comparisons are discussed in regard to the effects of variations in initial conditions, friction, and viscous damping.

scholarly journals Direct Time-Domain TAN Model of 3D Multilayer Hybrid PCB: Experimental Validation

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 60645-60654 ◽  
Author(s):  
Z. Xu ◽  
Y. Liu ◽  
B. Ravelo ◽  
J. Gantet ◽  
N. Marier ◽  
...  
Keyword(s):  
Time Domain ◽  
Experimental Validation

scholarly journals ATTACHMENT MODES IN THE METHOD OF MOMENTS IN TIME-DOMAIN

2013 ◽  
Vol 46 ◽  
pp. 317-336 ◽  
Author(s):  
Elson Agastra ◽  
Giuseppe Pelosi ◽  
Stefano Selleri
Keyword(s):  
Method Of Moments ◽  
Time Domain

Study of ground vibrations induced by railway traffic in a 3D FEM model formulated in the time domain: experimental validation

2016 ◽  
Vol 13 (5) ◽  
pp. 652-664 ◽  
Author(s):  
Jesús Fernández Ruiz ◽  
Pedro Alves Costa ◽  
Rui Calçada ◽  
Luis E. Medina Rodríguez ◽  
Aires Colaço
Keyword(s):  
Time Domain ◽  
Experimental Validation ◽  
Ground Vibrations ◽  
3D Fem ◽  
Fem Model ◽  
Railway Traffic ◽  
The Time Domain

Integrated application of heliborne and ground electromagnetic surveys for mapping EM conductor for uranium exploration and its subsurface validation, North Delhi Fold Belt, Rajasthan, India: A case study

Geophysics ◽  
2013 ◽  
Vol 78 (1) ◽  
pp. B13-B24 ◽  
Author(s):  
A. K. Chaturvedi ◽  
Cas Lotter ◽  
Shailesh Tripathi ◽  
A. K. Maurya ◽  
Indrajit Patra ◽  
...  
Keyword(s):  
Time Domain ◽  
Uranium Mineralization ◽  
Model Parameters ◽  
Fold Belt ◽  
The North ◽  
Geophysical Surveys ◽  
Uranium Exploration ◽  
Time Domain Electromagnetic ◽  
Conducting Bodies ◽  
Electromagnetic Surveys

A fracture-controlled uranium deposit was identified in Proterozoic Ajabgarh metasediments of the North Delhi Fold Belt within the Khetri subbasin at Rohil, Sikar district, Rajasthan, India. Uranium mineralization in the area is associated with geologic structures, albitization, and pyroxenization of metasediments and conductors such as metallic sulfides and carbonaceous phyllites/graphitic schists. To locate uranium mineralization akin to Rohil in nearby thick soil covered areas, this association was targeted through heliborne geophysical surveys. High-resolution heliborne magnetic and time domain electromagnetic (TEM) surveys were conducted around Rohil. The survey delineated several targets with favorable geologic structures and conductors such as graphitic schist for further uranium exploration. One favorable target near Chappar village was taken up for follow-up exploration work. The EM conductor mapped from heliborne survey was subsequently validated through ground time-domain electromagnetic surveys and subsurface exploration. Modeling of heliborne and ground-based electromagnetic data revealed the presence of subsurface conducting bodies with comparable model parameters. Drilling established the presence of a subsurface conductor up to a depth of 300 m, which was attributed to the presence of graphite and sulfides (pyrrhotite) along foliation plane of carbon phyllite/graphitic schist/quartz-biotite schist and calc-silicate rock. Further detailed laboratory investigations (petrology/X-ray diffraction) of selected core samples from the conductive zones confirmed the presence of pyrrhotite and graphite responsible for EM signature. This study, carried out by using multiparameter data sets, proved the efficacy of heliborne surveys in locating favorable targets for uranium exploration in Ajabgarh group of rocks.

scholarly journals A Compact Unconditionally Stable Method for Time-Domain Maxwell's Equations

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Zhuo Su ◽  
Yongqin Yang ◽  
Yunliang Long
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Symmetric Operator ◽  
Numerical Dispersion ◽  
Stable Method ◽  
Unconditionally Stable ◽  
Electromagnetic Problems ◽  
Performance Analyses ◽  
Computational Expenditure ◽  
Difference Time

Higher order unconditionally stable methods are effective ways for simulating field behaviors of electromagnetic problems since they are free of Courant-Friedrich-Levy conditions. The development of accurate schemes with less computational expenditure is desirable. A compact fourth-order split-step unconditionally-stable finite-difference time-domain method (C4OSS-FDTD) is proposed in this paper. This method is based on a four-step splitting form in time which is constructed by symmetric operator and uniform splitting. The introduction of spatial compact operator can further improve its performance. Analyses of stability and numerical dispersion are carried out. Compared with noncompact counterpart, the proposed method has reduced computational expenditure while keeping the same level of accuracy. Comparisons with other compact unconditionally-stable methods are provided. Numerical dispersion and anisotropy errors are shown to be lower than those of previous compact unconditionally-stable methods.

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