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This paper presents tools recently developed at CEA/Gramat to analyse the transient electromagnetic field on large targets. It focusses on: • The work on GORF3D FDTD solver and its peripheral tools developed in order to study very large and complex scenes • The results of numerical study of external and internal coupling from a plane wave to a very large scene • The difference on external and internal...
This paper aims at performing a risk analysis of an electromagnetic interference scenario depending on uncertain parameters. More precisely, the estimation of extreme interference levels is researched using a rigorous modeling of Maxwell's equations. In this context, the classical Monte Carlo simulation is not suitable since very expensive simulations have to be performed. Thus, this paper proposes...
This paper deals with EMC modelling analysis with regard to uncertain input parameters. We introduce a variance reduction technique called controlled stratification to estimate an extreme quantile of an interest response of a complex model. This technique relies on using a simple model to identify relevant input realizations. Then, these realizations allow evaluating the complex model for the quantile...
This paper deals with the risk analysis of an EMC default using a statistical approach. It is based on reliability methods from probabilistic engineering mechanics. A computation of probability of failure (i.e. probability of exceeding a threshold) of an induced current by crosstalk is established by taking into account uncertainties on input parameters influencing levels of interference in the context...
This paper treats about the risk analysis of an EMC default using a statistical approach based on reliability methods. A probability of failure (i.e. probability of exceeding a threshold) of an induced current by crosstalk is computed by taking into account uncertainties on input parameters influencing extreme levels of interference in the context of transmission lines. Results are compared to Monte...
Recently we have introduced a new approach based on the Holland's formalism to deal with thin wire in the FDTD method. However stability problem occurs when a wire has its length very short compared to the FDTD cell size. To avoid CFL criterion reducing, an original procedure using a temporal Crank-Nicolson scheme is proposed. This approach is applied to the auxiliary equations of Holland's formalism...
Recently we have introduced a new approach based on Holland's formalism to deal with then thin oblique wire in the FDTD method. Here we propose an original technique to model a thin wire with surrounding a dielectric sheath accurately. In addition, the multiwire junction of our oblique thin wire formalism has been generalized by using a rigorous equivalent circuit scheme of the coated wire.
In the FDTD method, the Cartesian meshing is a critical point for conforming structures and small geometries. For thin wire formalism, one cumulates small section with a problem of conforming to the Yee's cell and fast variation of both looping magnetic field and radial electric field close to the wire. Among all previous thin wire published models, only Holland's approach has evolved toward inclined...
The susceptibility of printed circuit boards (PCB) in a reverberation chamber can be simulated by using the superposition of random plane waves to obtain the corresponding Hill's model. The aim of this work is to avoid simulating the entire reverberation chamber by 3D methods. Magnitudes and resonances measured in RC are compared to FDTD and MTL results with a Hill's model of plane waves transposed...
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