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The simulation of transient magnetic field problems requires the repeated and successive solution of high-dimensional linear systems with near-identical system matrices and different righthand side vectors. The combination of conjugate gradient method with subspace projection methods is shown. Additionally, the formulation for the azimuthal component of the magnetic vector potential for axisymmetric...
The Finite Element Method (FEM) has been extensively used to solve the field equations of electric machines or devices. It is possible to reduce the complexity of the method considering plane symmetry on the behavior of the magnetic field. Nevertheless, this simplification does not include the side effects of the magnetic field.
The building sector consumes a large part of the energy used in the United States and is responsible for nearly 40% of greenhouse gas emissions. It is therefore economically and environmentally important to reduce the building energy consumption to realize massive energy savings. In this paper, a method to control room temperature in buildings is proposed. The approach is based on a distributed parameter...
Full-wave analysis has become critical to the signal integrity of 3D high-speed circuits due to increased electromagnetic (EM) effects. The finite-element time-domain (FETD) method has become a strong candidate among different EM algorithms and domain decomposition methods have been proposed to avoid the need to solve a global matrix equation in FETD. In this work, a novel unconditionally stable FETD-based...
The paper outlines a recently developed numerical computation algorithm set up for the analysis of the electromagnetic interferences generated by the overhead high voltage lines (OHL) on the neighbour pipeline networks. The main advantage of the algorithm proposed is that it can handle applications with unparallel arrangements between OHL and pipelines and therefore the induced potential and current...
Structural irregularities have a major impact on the protective properties of conductive screens. This paper addresses the methods for simulating the penetration of electric fields inside real 3-dimensional structurally irregular electromagnetic screens in quasi-statics. The author aims to find the reference method for the future theoretical as well as experimental studies on real conductive screens...
In this paper, with computer assistance, all the nonnegative integral solutions to an exponential Diophantine equation are determined by elementary method.
This research is an analysis of stiffener plate dimensions at the column base of the overhanging traffic sign post under effect on vehicle-induced gusts. The finite element analysis (FEA) result is compared with the result form computation using mathematical equation and an experimental result which cited from Fongsamootr T. and Chartpuk P. [2006]. It is found that the FEA result has deviation about...
Multi-agent generation within a special scene is a basic problem for the research on artificial society. In the context of public health emergency, the multi-agent model of an artificial campus is built; based on the deep analysis of the problem, we consider that a special scene in artificial society is approximate to a polygon determined by some key points (border points). Therefore the problem of...
Solving of large sparse matrix linear equations is always the research focus of scientific and engineering calculation field. With the sparsity and symmetry characteristics of coefficient matrix, Compressed Sparse Row (CSR) is adopted in the storage of large sparse matrix linear equations. Under the condition of CSR, Symmetrica Successive Over Relaxations-Preconditioned Conjugate Gradient method (SSOR-PCG)...
In this paper we investigate the potential-based finite element algorithms for eddy-current problems. In our models the source coil carries a pulse excitation current generating a transient field. As distinguished from the traditional coupled algorithm whose discrete equation system including both vector and scalar potential unknowns is solved at every time-step, a novel decoupled algorithm is presented...
In the paper we mainly consider the finite element numerical solutions for a class of optimal control problem governed by nonlinear parabolic equations. We derive an error estimates for the coupled state and the control solutions of the nonlinear parabolic optimal control problems. The state and co-state are approximated by the mixed finite element spaces and the control is approximated by piecewise...
A meshless model is developed to investigate behaviors of heat conduction in skin tissues. The model is established through combined use of Laplace transform (LT), radial basis function (RBF) and method of fundamental solution (MFS). The well-known Pennes bioheat model is used to describe the process of heat conduction in skin tissues. First, Laplace transform is applied to handle the time variable...
FEM software has been well-developed in shock wave simulation. As the software usually is huge and complicated, subdivision mesh needs lots of computation, and the precision is not assured, finite-difference methods are highly regarded. Difference schemes are related to the stability and precision. In this paper, a Lax-Friedrichs based difference method is presented. Different grids were discussed...
Modal analysis is an important step in optimal design of the spindle. Speedy cotton spindles of JW.D3203 are studied in this paper. The structural features of the spindle are described. ANSYS finite element analysis software is used for modeling of the spindle. Setting material properties, defining element type, meshing, and determining the boundary conditions are done before the top ten mode figures...
We evaluate the RF network scattering parameters (S-parameters) of the calibration standards for the coaxial transmission lines. Those standards include: single ended open/shorts, step discontinuities in inner/outer conductors, tapers, and mismatch airlines. We use either an analytical function when the geometry is simple, or finite elements analysis for the more elaborate geometry. Whenever possible,...
It has been reported that water vapor ingress and saturation of encapsulant materials dominantly impact on longterm reliability of copper indium gallium selenide PV cells. To understand diffusion mechanism of water vapor into PV module, diffusion coefficient and solubililty of various encapsulants and their temperature dependency were investigated. Based on experimentally determined permeation properties,...
This paper proposes a feedback control method for a Linear Resonant Actuator (LRA), in which an external load estimated from two signals of the back-EMF is used as a target voltage in PID control. The effectiveness of this method was verified through the FEM analysis in which the magnetic field equation is coupled with electric circuit equation, control method, and motion equation. As a result, it...
Based on the nonlinear dynamic explicit finite element software LS-DYNA 3D, the parameters of detonator and Constitutive models of air, fragment and the Phased Array Radar Antenna Equivalent panel were ascertained. Numerical Simulation of target multiplex damage of fragment and shock wave was processed. The simulation results of shock wave overpressure, the board plastic deformation and the camber...
Navier's equations modelling linear elastic solid deformations are embedded within an Extended Kalman Filter (EKF) to compute a sequential Bayesian estimate for the Non-Rigid Structure from Motion problem. The algorithm processes every single frame of a sequence gathered with a full perspective camera. No prior data association is assumed because matches are computed within the EKF prediction-match-update...
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