Search results for " electromagnetic transient"

showing 3 items of 3 documents

A marching-on in time meshless kernel based solver for full-wave electromagnetic simulation

2012

A meshless particle method based on an unconditionally stable time domain numerical scheme, oriented to electromagnetic transient simulations, is presented. The proposed scheme improves the smoothed particle electromagnetics method, already developed by the authors. The time stepping is approached by using the alternating directions implicit finite difference scheme, in a leapfrog way. The proposed formulation is used in order to efficiently overcome the stability relation constraint of explicit schemes. In fact, due to this constraint, large time steps cannot be used with small space steps and vice-versa. The same stability relation holds when the meshless formulation is applied together w…

Alternating directions implicit scheme · Finite difference time domain · Meshless methods · Electromagnetic transient analysisRegularized meshless methodElectromagneticsApplied MathematicsNumerical analysisMathematical analysisFinite-difference time-domain methodSolverSettore ING-IND/31 - ElettrotecnicaSettore MAT/08 - Analisi NumericaKernel (image processing)Meshfree methodsApplied mathematicsTime domainMathematicsNumerical Algorithms
researchProduct

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
researchProduct

Finite difference time domain simulation of soil ionization in grounding systems under lightning surge conditions

2004

This paper proposes a Maxwell’s equations finite difference time domain (FDTD) approach for electromagnetic transients in ground electrodes in order to take into account the non linear effects due to soil ionization. A time variable soil resistivity method is used in order to simulate the soil breakdown, without the formulation of an initial hypothesis about the geometrical shape of the ionized zone around the electrodes. The model has been validated by comparing the computed results with available data found in technical literature referred to concentrated earths. Some application examples referred to complex grounding systems are reported to show the computational capability of the propos…

PhysicsFinite difference electromagnetic transient grounding systemsGroundSoil resistivityFinite differenceFinite-difference time-domain methodSoil ionizationOcean EngineeringMechanicsPhysics::Classical PhysicsNon-linear effectsSettore MAT/08 - Analisi NumericaSettore ING-IND/31 - ElettrotecnicaIonizationLightning surgesSimulation
researchProduct