Search results for "Electromagnetic transients"

showing 5 items of 5 documents

EMI Analysis in Electrical Drives under Lightning Surge Conditions

2012

In this paper, a complete model of a power drive system including the earth electrodes is proposed to evaluate electromagnetic conducted interference due to lightning pulses. Circuit model of a power drive system is joined with a full-wave approach for the simulation of the time behavior of the grounding system. The proposed model enables to predict the electromagnetic conducted interference generated in the power drive system when lightning conditions involve the earth electrodes.

Conducted electromagnetic interferenceEngineeringbusiness.industryGroundElectromagnetic compatibilityElectrical engineeringElectromagnetic interference (EMI) electromagnetic transients finite-difference time-domain method induction motor drives lightning protection moments method.Condensed Matter PhysicsEarthing systemLightning arresterLightningAtomic and Molecular Physics and OpticsElectromagnetic interferencePhysics::GeophysicsSettore ING-IND/31 - ElettrotecnicaHardware_GENERALPhysics::Plasma PhysicsEMIElectronic engineeringElectrical and Electronic Engineeringbusiness
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Corrective meshless particle formulations for time domain Maxwell's equations

2007

AbstractIn this paper a meshless approximation of electromagnetic (EM) field functions and relative differential operators based on particle formulation is proposed. The idea is to obtain numerical solutions for EM problems by passing up the mesh generation usually required to compute derivatives, and by employing a set of particles arbitrarily placed in the problem domain. The meshless Smoothed Particle Hydrodynamics method has been reformulated for solving the time domain Maxwell's curl equations. The consistency of the discretized model is investigated and improvements in the approximation are obtained by modifying the numerical process. Corrective algorithms preserving meshless consiste…

Electromagnetic fieldRegularized meshless methodMathematical optimizationDiscretizationNumerical analysisApplied MathematicsMeshless particle methodMaxwell's equationSmoothed particle hydrodynamicsElectromagnetic transientsSmoothed-particle hydrodynamicssymbols.namesakeSettore MAT/08 - Analisi NumericaSettore ING-IND/31 - ElettrotecnicaComputational MathematicsMaxwell's equationsMaxwell's equationsMesh generationsymbolsElectromagnetic transientApplied mathematicsTime domainMathematicsJournal of Computational and Applied Mathematics
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Finite difference time domain simulation of earth electrodes soil ionisation under lightning surge condition

2008

The non linear effects of soil ionisation on the behaviour of earth electrodes are investigated by a finite difference time domain numerical scheme. A time variable soil resistivity is used in order to simulate the soil breakdown; step by step the resistivity value is controlled by the local instantaneous value of the electric field compared with the electrical strength, fixed for the soil. No a priori hypothesis about the geometrical shape of the ionised zone around the electrodes has to be enforced. Simulation results related to complex earth electrodes of limited extension are reported. The model has been validated by comparing the computed results with data available in technical litera…

Engineeringfinite difference time domain numerical methodbusiness.industryGroundSoil resistivityFinite-difference time-domain methodMechanicsAtomic and Molecular Physics and OpticsPhysics::GeophysicsNon-linear effectselectromagnetic transientsSettore ING-IND/31 - ElettrotecnicaElectrical resistivity and conductivityElectric fieldIonizationElectronic engineeringElectrical and Electronic Engineeringsoil ionizationbusinessVoltageIET Science, Measurement & Technology
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A full wave three dimensional meshless approach for electromagnetic transients

2010

Meshfree methodElectromagnetic transients
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Smoothed Particle ElectroMagnetics: A mesh-free solver for transients

2006

AbstractIn this paper an advanced mesh-free particle method for electromagnetic transient analysis, is presented. The aim is to obtain efficient simulations by avoiding the use of a mesh such as in the most popular grid-based numerical methods. The basic idea is to obtain numerical solutions for partial differential equations describing the electromagnetic problem by using a set of particles arbitrarily placed in the problem domain. The mesh-free smoothed particle hydrodynamics method has been adopted to obtain numerical solution of time domain Maxwell's curl equations. An explicit finite difference scheme has been employed for time integration. Details about the numerical treatment of elec…

Partial differential equationElectromagneticsNumerical analysisApplied MathematicsMathematical analysisFinite-difference time-domain methodFinite difference methodMaxwell's equationSmoothed particle hydrodynamicsElectromagnetic transientsSettore MAT/08 - Analisi NumericaSettore ING-IND/31 - Elettrotecnicasymbols.namesakeComputational MathematicsMaxwell's equationsMaxwell's equationsScattering-matrix methodElectromagnetic transientsymbolsTime domainMesh-free particle methodMathematicsJournal of Computational and Applied Mathematics
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