Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"; Electromagnetic problems"”.
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Model Order Reduction: Application to Electromagnetic Problems
… structural analysis to combustion modeling and electromagnetics, discretization methods–in particular the finite element method–have had a tremendous impact. Their main advantage consists in a correct representation of dynamical and nonlinear behaviors by solving equations at local scale, …
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Hybrid explicit-implicit FDTD-FEM time-domain solver for electromagnetic problems
… numerical techniques used for solving Maxwell's electromagnetic equations. FDTD-FEM hybrid methods opt for combining the advantages of both FDTD and FEM. In this dissertation, signal processing techniques were used to analyze the FDTD stability condition. A procedure, which reduces time-sampling …
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Stability and Convergence of the Method of Moments Applied to Electromagnetic Problems
Made available in DSpace on 2014-12-12T20:54:08Z (GMT). No. of bitstreams: 1 7524344.pdf: 6575312 bytes, checksum: 6276ba5a249fde6ebd4c9db08c669ecc (MD5) Previous issue date: 1975
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A Higher-Order Perfectly Matched Layer for Open-Region, Waveguide, and Periodic Electromagnetic Problems
… applied to waveguide, periodic, and open-region electromagnetic problems and its performance is compared to the regular's and the CFS-PML's performance. The second-order PML outperforms both and its performance is proved to be independent of the formulation or the simulation technique, since the …
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Unified conformal/nonconformal domain decomposition methods for solving large-scale multi-region electromagnetic problems
… method for the full-wave analysis of large-scale electromagnetic problems in three dimensions. These algorithms are designed to expand the capability of the FETI-DP method to accommodate more flexible interface meshes, to achieve faster convergence of the global interface problem, and to reduce …
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Development and Application of the Feti-Dpem Algorithm for Analysis of Three-Dimensional Large-Scale Electromagnetic Problems
… the basics of the frequency-domain (FD) FEM in electromagnetics (EM), which includes the discussion of ABCs for the open-region analysis. It is then followed by a detailed study of the FETI-DPEM1 algorithm to show its efficiency and capability. The applications of the FETI-DPEM1 are then further …
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Investigation of general-purpose computing on graphics processing units and its application to the finite element analysis of electromagnetic problems
… instantaneous nonlinear effect between the electromagnetic field and the medium permittivity. The Newton-Raphson method is incorporated to reduce the number of nonlinear iterations through its quadratic convergence. Various nonlinear examples are presented to show the different Kerr effects …
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Web-based electromagnetic simulation
Electromagnetic simulators have traditionally been used as back-end analysis tools to verify the results of circuit simulators. They work by accurately modeling the physical effects in a variety of structures ranging from transmission lines to planar circuits.Most of electromagnetic simulation …
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Assessing the benefits of DCT compressive sensing for computational electromagnetics
Computational electromagnetic problems are becoming exceedingly complex and traditional computation methods are simply no longer good enough for our technologically advancing world. Compressive sensing theory states that signals, such as those used in computational electromagnetic problems have a …
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Modelling and analysis of complex electromagnetic problems using FDTD subgridding in hybrid computational methods. Development of hybridised Method of Moments, Finite-Difference Time-Domain method and subgridded Finite-Difference Time-Domain method for precise computation of electromagnetic interaction with arbitrarily complex geometries
… of this research is to model and analyse complex electromagnetic problems by means of a new hybridised computational technique combining the frequency domain Method of Moments (MoM), Finite-Difference Time-Domain (FDTD) method and a subgridded Finite-Difference Time-Domain (SGFDTD) method. This …
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A Single-Field Finite-Difference Time-Domain Formulations for Electromagnetic Simulations
… time-domain updating equations for solving electromagnetic problems is derived. The formulation uses a single-field expression for full-wave solution. This formulation can provide numerical results similar to those obtained using the traditional formulation with less required computer …
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Recursive algorithms for computational electromagnetics
… and the space-domain solutions of the electromagnetic scattering problems have been developed. These algorithms have less than $O(N\sp3)$ computational complexities and less than $O(N\sp2)$ memory requirements for arbitrary geometries of scatterers clustered together. Although the …
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Implementation and experiments with the discontinuous Galerkin method for Maxwell's equations
… with the method, namely: simulation of simple electromagnetic problems with a known analytical solution for comparison and error analysis; comparison of different time discretization schemes, which are not strictly part of DGM; reduction of computation time with the use of adaptive time steps; …
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Finite element method using vector finite elements applied to eddy current problems
Vector fields found in electromagnetics are fundamentally different to vector fields found in other research areas such as structural mechanics. Electromagnetic vector fields possess different physical behaviour patterns and different properties in comparison to the other vector fields and therein …
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Efficient solution of Maxwell's equations using the nonuniform orthogonal finite difference time domain method
… and computation time when applied to large problems, complicated geometries, or geometries with fine features. In this thesis, the nonuniform orthogonal FDTD method is presented and applied to a variety of electromagnetic problems. The nonuniform aspect of the method gives great flexibility …
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Critical analysis of a practical fourth order finite-difference time-domain algorithm for the solution of Maxwell's equations
… (second order). The high complexity of today's electromagnetic problems necessitate a FDTD formulation that can use less computational memory and complete simulations faster than current second order FDTD formulations. Many researchers have studied the benefits of FDTD formulations based on …
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A Hybrid Spectral-Element / Finite-Element Time-Domain Method for Multiscale Electromagnetic Simulations
… method for transient analysis of multiscale electromagnetic problems, where electrically fine structures with details much smaller than a typical wavelength and electrically coarse structures comparable to or larger than a typical wavelength coexist.</p><p>Simulations of multiscale …
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Issues related to finite element techniques for two dimensional transmission structures
… element techniques for both static and dynamic problems in electromagnetics. An automatic mesh generation scheme is developed by forming a Delaunay triangulation. A storage technique will be presented and used In conjunction with a conjugate gradient method to solve linear systems of equations. …
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On improving the low-frequency performance of full-wave modeling techniques
… method are very powerful methods for solving electromagnetic problems in the frequency domain. However, the direct application of these techniques at low frequencies results in instability and significant errors. This is due to the divergence operation on the surface current density in the …
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A generalized precorrected-FFT method for electromagnetic analysis
… generality, reducing their applicability to many problems and preventing engineers and researchers from easily building on a common, popular base of code. In this thesis we create a BEM solver which uses the Pre-Corrected FFT technique for accelerating computation, and uses a novel approach which …
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