A5036901685- Electromagnetic Simulation and Numerical Methods
- Electromagnetic Scattering and Analysis
- Lightning and Electromagnetic Phenomena
- Electromagnetic Compatibility and Measurements
- Microwave Engineering and Waveguides
- Electromagnetic Compatibility and Noise Suppression
- Advanced Antenna and Metasurface Technologies
- Advanced Numerical Methods in Computational Mathematics
- Geophysical Methods and Applications
- Numerical methods for differential equations
- Microwave Imaging and Scattering Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Model Reduction and Neural Networks
- Engineering and Test Systems
- Advanced SAR Imaging Techniques
- Numerical methods in engineering
- Image and Signal Denoising Methods
- Gyrotron and Vacuum Electronics Research
- Metamaterials and Metasurfaces Applications
- Real-time simulation and control systems
- Advanced Sensor Technologies Research
- Advanced Battery Technologies Research
- Ultrasonics and Acoustic Wave Propagation
- Antenna Design and Analysis
Airbus (Spain)
2014-2020
Universidad de Granada
2012-2018
Airbus (Netherlands)
2017
Airbus (Italy)
2014
Empresarios Agrupados
2012
Graphene-based devices constitute a pioneering field of research for their extraordinary electromagnetic properties. The incorporation appropriate models into numerical simulators is necessary in order to take advantage these In this work, we propose method incorporate graphene-sheet the FDTD method. use vector-fitting techniques expands permittivity graphene rational function series complex conjugate pole-residue pairs, which implemented by an auxiliary differential equation formulation....
The simulation of highly resonant structures requires techniques that are accurate and free spurious-mode contamination. Spurious modes can severely corrupt the solution a physical problem, their suppression is must for any numerical scheme in frequency or time domain (TD). In this paper, we present application spurious-free vector discontinuous Galerkin TD method to waveguide applications. We show spurious solutions (which increase with number degrees freedom problem) be efficiently...
We summarize the boundary and source implementation for several formulations of discontinuous Galerkin time domain method (DGTD). Since DGTD with zeroth-order scalar basis functions using upwind flux, coincides finite volume (FVTD), many concepts developed FVTD can be ported to in any its different (scalar/vector basis, upwind/centered flux). Numerical examples illustrate alternatives.
Discontinuous Galerkin, applied to time-dependent Maxwell equations (DGTD), offers attractive properties when compared other numerical methods. This method is flexible and accurate, like the finite element method, efficient as well scalable finite-difference time-domain algorithms. In this letter, a new rigorous treatment of anisotropic materials in three dimensions described validated for upwind-flux DGTD method.
The inclusion of thin lossy material layers, such as carbon-based composites, is essential for many practical applications modeling the propagation electromagnetic energy through composite structures those found in vehicles and electronic equipment enclosures. Many existing schemes suffer problems late time instability, inaccuracy at low frequency (LF), and/or large computational costs. This paper presents a novel technique thin-layer materials finite-difference domain (FDTD) schemes, which...
In this paper, we show the application of numerical simulation for virtual testing a very complex system under high-intensity radiated fields (HIRF) conditions. Numerical results have been compared to measurements performed on C-295 aircraft. The approach is based use multiple tools preprocessing, computation, and postprocessing, all them integrated same framework. This study part HIRF SE project, final step validation involved there, introduce in whole aircraft certification process an...
The increased use of carbon-fiber composites in unmanned aerial vehicles is a challenge for their EMC assessment by numerical solvers. For accurate and reliable simulations, procedures should be tested not only individual components, but also within the framework complete systems. With this aim, paper presents benchmark test case based on experimental measurements coming from direct-current injection tests SIVA air vehicle, reproduced finite-difference-time-domain solver that employs new...
A novel conformal technique for the FDTD method, here referred to as Conformal Relaxed Dey-Mittra is proposed and assessed in this letter. This helps avoid local time-step restrictions caused by irregular cells, thereby improving global stability criterion of original method. The approach retains a second-order spatial convergence. numerical experiment based on NASA almond has been chosen show improvement accuracy computational performance
In this paper, a near-field (NF) 2-D-lateral scan system is conceptually described. The analysis of the formally performed in general manner from modelization setup to postprocessing measured or simulated data. final purpose measure radar cross section (RCS) full-scale targets located on ground. process takes following steps: 1) NF lateral scanning; 2) inverse synthetic aperture (ISAR) computation; 3) scattering centers (SCs) extraction; and 4) computation RCS. Techniques are proposed for...
In this paper, we explore the accuracy limits of a finite-element time-domain (TD) method applied to Maxwell equations, based on discontinuous Galerkin scheme in space, and leap-frog temporal integration. The dispersion dissipation properties are investigated, as well anisotropy errors. results novel analysis represented practical comprehensible manner, useful for application method, understanding behavior errors Gelerkin TD methods. A comparison with finite-difference terms computational...
In this paper, we demonstrate the computational affordability and accuracy of a leap-frog discontinuous Galerkin (LFDG) time-domain method for high intensity radiated fields assessment in electromagnetic compatibility aerospace. The conformal truncation domain is discussed formulated LFDG context. Numerical validations are performed on challenging test cases, comparison to measurements other numerical methods, demonstrating accuracy, efficiency, scalability algorithm.
The UAVEMI project, funded by the Spanish Ministry of Economy and Competitiveness, gathers a consortium formed several research development institutions one industrial partner. main goal is to develop innovative experimental numerical approaches for assessment electromagnetic compatibility unmanned air vehicles, under high intensity radiated fields, lightning indirect effects non-nuclear pulses. This contribution describes capabilities currently being developed project.
A new nodal hybrid continuous-discontinuous Galerkin time-domain (CDGTD) method for the solution of Maxwell's curl equations is proposed and analyzed. This hybridization made by clustering small collections elements with a continuous (CG) formalism. These clusters exchange information their exterior through discontinuous (DG) numerical flux. scheme shows reduced dispersion error respect to classical DG formulations certain orders numbers clustered elements. The spectral radius...
An essential characteristic for the accurate simulation of wideband antenna systems is modeling their intricate geometrical details, including feeding ports. In this article, we describe a leap-frog (LF) discontinuous Galerkin (DG) time-domain (TD) method combined with an efficient local time-stepping (LTS) strategy to deal high contrast in element sizes electromagnetic these kinds structures. The traditional delta-gap source model and realistic coaxial port are revisited. Numerical examples...
Thin-sheet models are essential to allow shielding effectiveness of composite enclosures and vehicles be modeled. Thin dispersive sheets often modeled using surface-impedance in finite-difference time-domain (FDTD) codes order deal efficiently with the multiscale nature overall structure. Such boundary conditions must applied collocated tangential electric magnetic fields on either side surface; this is usually done edges FDTD mesh cells at field sampling points. However, these edge-based...
In this paper, we show a simulation strategy for composite dispersive thin-panels, starting from their microscopic characteristics and ending into time-domain macroscopic model.In first part, revisit different semianalytic methods that may be used to obtain the S-parameter matrices.The validity of them is assessed with numerical simulations experimental data.We also include some formulas tailor shielding effectiveness panels in design phase.In second present an extension media subgridding...
A method, hereinafter referred to as discrete chaff cloud model (DCCM), for the electromagnetic modeling of general clouds is presented, with which harmonic or wideband impulse scattering responses can be evaluated. The applies a wide range scenarios, any combination illumination and observation angles polarizations. technique considers geometry statistical distributions elements, both in density orientation. After 1-D discretization cloud, complete response single-experiment observations...
Computer simulations provide invaluable information in HIRF (High Intensity Radiated Field) assessment of air vehicles. In this paper, we use a numerical model fictive metallic aircraft provided by EVEKTOR, to show cross comparison results found some the full-wave solvers developed partners participating HIRF-SE project 7 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> EU FP. Time domain and frequency simulators, based on differential,...
A novel conformal technique for the finite-difference time-domain (FDTD) method is proposed to deal with curved and arbitrarily oriented lossy thin panels. This formulated as an extension of existing relaxed Dey-Mittra (CRDM) combined subcell algorithms handle wave propagation across panel. Two alternatives are presented this: classical impedance network boundary condition (INBC) a recent subgridding (SGBC) developed by authors. Several test cases employed demonstrate capability remove...
Preparing the 3D-geometry models to perform electromagnetic compatibility (EMC) numerical simulations can be tedious and time consuming. Furthermore, need include test setup in models, order validate software, by comparing results with measured data, may lead unwieldy simulation often unaffordable computational costs. In this paper, we illustrate a procedure optimize simplify modeling process, together guidelines for achieving most unfavorable case of EMC problems, as required certification...
Computational solvers are increasingly used to solve complex electromagnetic compatibility (EMC) problems in research, product design, and manufacturing. The reliability of these simulation tools must be demonstrated order give confidence their results. Standards prescribe a range techniques for the validation, verification, calibration computational electromagnetics including external references based on measurement or cross-validation with other models. We have developed modular test-suite...
ABSTRACT In this paper we describe the discontinuous Galerkin time‐domain method and apply it to simulation of ground‐penetrating radar (GPR) problems in 3D. The is first validated with analytical solutions show its superior behaviour when compared classical finite‐difference method, widely employed GPR simulation.
Abstract A general fully coupled multi-hybrid method in three dimensions combining the finite element method, of moments, and a high-frequency asymptotic technique, namely, physical optics, is presented. Complex radiating structures are analyzed with (which easily handles complex geometries, permeable materials, anisotropy, so on), while small- medium-sized perfect electric conductor objects rigorously using moments; large can be efficiently optics. Furthermore, different regions same object...
We present a new face centered approach to the collocation of fields for application surface impedance boundary condition (SIBC). This deals with ambiguities in normal that arise at edges on stair-cased surfaces. The accuracy scheme is compared edge based and conformal approaches using both planar sheet spherical shell test cases. Stair-casing effects are evaluated face-centered exhibits significantly less error than approach.