Persona: Fernández Romero, Sergio
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Instituto Nacional de Técnica Aeroespacial
El Instituto Nacional de Técnica Aeroespacial es el Organismo Público de Investigación (OPI) dependiente del Ministerio de Defensa. Además de realizar actividades de investigación científica y de desarrollo de sistemas y prototipos en su ámbito de conocimiento, presta servicios tecnológicos a empresas, universidades e instituciones.
El INTA está especializado en la investigación y el desarrollo tecnológico, de carácter dual, en los ámbitos de la Aeronáutica, Espacio, Hidrodinámica, Seguridad y Defensa.
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Fernández Romero
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Sergio
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14 resultados
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Publicación Restringido SIVA UAV: A Case Study for the EMC Analysis of Composite Air Vehicles(Institute of Electrical and Electronics Engineers, 2017-01-31) Cabello, M. R.; Fernández Romero, Sergio; Pous Solà, M.; Pascual Gil, E.; Angulo, L. D.; López, Patricia; Riu, Pere J.; Gutierrez, G. G.; Mateos, D.; Poyatos Martinez, David; Fernández Chimeno, M.; Álvarez, Jesús; Pantoja, M. F.; Añón Cancela, M.; Silva, F.; Rubio Bretones, Amelia; Trallero Vela, R.; Nuño, L.; Escot Bocanegra, D.; Gómez Martín, R.; García, Salvador G.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, numerical procedures should be tested not only for individual components, but also within the framework of complete systems. With this aim, this paper presents a benchmark test case based on experimental measurements coming from direct-current injection tests in the SIVA unmanned air vehicle, reproduced by a numerical finite-difference-time-domain solver that employs a new subgridding scheme to treat lossy composite thin panels. Validation was undertaken by applying the feature selective validation method, which quantifies the agreement between experimental and numerical data.Publicación Acceso Abierto Magnetometric Surveys for the Non-Invasive Surface and Subsurface Interpretation of Volcanic Structures in Planetary Exploration, a Case Study of Several Volcanoes in the Iberian Peninsula(Multidisciplinary Digital Publishing Institute (MDPI), 2022-04-24) Díaz Michelena, Marina; Kilian, R.; Ángel Rivero, M.; Fernández Romero, Sergio; Ríos, F.; Mesa, José Luis; Oyarzún, A.; Instituto Nacional de Técnica Aeroespacial (INTA); Agencia Estatal de Investigación (AEI); European Commission (EC)Volcanoes are typical features of the solar system that offer a window into the interior of planets. Thus, their study can improve the understanding of the interiors and evolution of planets. On Earth, volcanoes are monitored by multiple sensors during their dormant and active phases. Presently, this is not feasible for other planets’ volcanoes. However, robotic vehicles and the recent technological demonstration of Ingenuity on Mars open up the possibility of using the powerful and non-destructive geophysical tool of magnetic surveys at different heights, for the investigation of surfaces and subsurfaces. We propose a methodology with a view to extract information from planetary volcanoes in the short and medium term, which comprises an analysis of the morphology using images, magnetic field surveys at different heights, in situ measurements of magnetic susceptibility, and simplified models for the interpretation of geological structures. This methodology is applied successfully to the study of different examples of the main volcanic zones of the Iberian Peninsula, representative of the Martian intraplate volcanism and similar to Venus domes, as a preparatory action prior to the exploration of the rocky planets’ surfaces.Publicación Restringido Validation procedure of low level coupling tests on real aircraft structure(IEEE Xplore, 2012-12-31) Fernández Romero, Sergio; López Morales, Andrés; Añón Cancela, M.; Gutierrez, Guadalupe G.; European Commission (EC)This paper describes the analysis of the experimental test results obtained during the low level swept coupling (LLSC) and low level direct drive (LLDD) tests on FALCON 7X horizontal tail plane provided by EADS-CASA. These techniques are evaluated during the aircraft high intensity radiated field (HIRF) certification process and in the scope of European Community's FP7 HIRF SE project. The analysis of low level test results shall be performed to estimate the influence of the test setup with particular regard to the in-flight coupling configuration. For this reason, finite difference time domain (FDTD) 3D computations have been used to determine the relationship between free field external radiation and skin current in different illumination angles and polarizations. Finally, after validation by comparison of the measured and computed skin current, measured bundle current are related to measured skin currents, to provide the transfer function link to the external field.Publicación Restringido Comparison of Facilities for Low Level Coupling Tests in UAV EMC Certification(Institute of Electrical and Electronics Engineers, 2017-11-30) Fernández Romero, Sergio; Escot Bocanegra, David; Poyatos Martinez, David; Añón Cancela, M.; López Rodríguez, P.; Ministerio de Economía y Competitividad (MINECO); Agencia Estatal de Investigación (AEI)The rise in the utilization of Unmanned Aerial Vehicles (UAVs) in the last years has also brought concerns in terms of Electromagnetic Compatibility (EMC) regulation of these platforms. Depending on the nature and operations of the UAVs, they are being required to go through the same processes than an aircraft EMC certification of aircraft involves a wide variety of tests. This paper deals with two aircraft low level coupling tests, namely, Low Level Direct Drive (LLDD) and Low Level Swept Fields (LLSF) and compares the results obtained in two different sites. On one hand, an Open Area Test Site (OATS) will be employed and, on the other hand, a Reverberation Chamber (RC) will be the other facility examined. The object under test will be a representative part of an UAV.Publicación Acceso Abierto Method for calibration sample manufacturing for space instrumentation and regolith characterization(VIII Planetary Science & Solar System Exploration Congress (CPESS-8), 2025-05) De la Cruz - Karnavas, Leonardo; Fernández Romero, Sergio; Plaza Gallardo, Borja; Poyatos Martinez, David; Marina, Fernández-RuzThe measurement of the magnetic field by means of magnetometers is the most straightforward method for the characterization of magnetic bodies. The magnetic field generated by a body (in the absence of electrical currents) comprises a remnant and an induced contribution. This last one is due to the magnetization of the body under the effect of a magnetic field. Often, it is important to distinguish between these two contributions. During magnetic surveys, it helps to improve the interpretation of the magnetic carriers that yield the magnetic signature. In general, it is useful to estimate the magnetization changes that a body is expected to have when it is immersed in a magnetic field.Publicación Restringido Limitations in the Measurement of the Shielding Effectiveness of Aeronautical Multi-ply CFC Laminates(Institute of Electrical and Electronics Engineers, 2019-10-17) Gómez de Francisco, Patricia; Poyatos Martinez, David; Plaza Gallardo, Borja; Escot Bocanegra, D.; Fernández Romero, Sergio; Agencia Estatal de Investigación (AEI)Modern aircraft employ profusely carbon fiber composites (CFC) for their construction. Then, it is mandatory to characterize the behaviour of this kind of materials for its use under harsh electromagnetic environments. In that sense, this paper presents the application of two standards, the ASTM D4935 and the IEC 61000-4-21, to the measurement of the shielding effectiveness (SE) of aeronautical multi-ply CFC laminates frequently used for the construction of aircraft. Each technique is well suited for a specific material or realization and a specific frequency range. So, both techniques are complementary and should be developed in parallel. Taking into account the high SE expected for this kind materials, the set-ups imply the measurement of very low signals, that poses an experimental challenge that has to be faced. Then, in this study, different test samples and realizations of CFC materials have been fabricated and measured. Improvements on the traditional measurement procedures have been applied, obtaining promising results.Publicación Acceso Abierto On the Use of FDTD for HIRF Validation and Certification(The Electromagnetic Academy (USA), 2012-06-12) Gutierrez, Guadalupe G.; Fernández Romero, Sergio; Álvarez, Jesús ; González García, Salvador; Pascual Gil, Enrique; Ministerio de Ciencia e Innovación (MICINN); European Commission (EC); Junta de AndalucíaPreparing the 3D-geometry models to perform electromagnetic compatibility (EMC) numerical simulations can be tedious and time consuming. Furthermore, the need to include the test setup in the models, in order to validate the software, by comparing the numerical results with the measured data, may lead to unwieldy simulation models with often una ordable computational costs. In this paper, we provide strategies for optimizing and simplifying the modeling process, together with guidelines for achieving the most unfavorable case in the simulation of EMC problems, as required for a certi cation process. A test case from the European FP7 HIRF-SE project is analyzed in this paper as an example of how to identify the unnecessary elements for the simulation, while retaining the essential physics of the problem.Publicación Restringido Prediction of the maximum electric field level inside a metallic cavity using a quality factor estimation(Taylor and Francis online, 2014-06-26) Fernández Romero, Sergio; Gutierrez, Guadalupe G.; González, Iván; Ministerio de Economía y Competitividad (MINECO)This paper presents a method for predicting the maximum electric field level inside a metallic cavity making use of the quality factor (Q) estimation. This calculation requires a two-step approach combining several theoretical models which can be found in the literature. A very good agreement in the frequency range between 100 MHz and 40 GHz has been achieved with the data obtained from the validation of two reverberation chambers made of different conductive materials. The wide frequency band analyzed permits us to draw conclusions about the main contributions in the cavity Q and their relationships with the maximum electric field level. This paper also describes and identifies the relationships between the antenna parameters and dissipation mechanisms vs. frequency for the different models. This estimation could be used to calculate a possible EMC threat of a spurious emission of EM signals which could produce a susceptibility problem in other equipments installed in the same cavity.Publicación Restringido On the Design of a Planetary Protection Shell for EMC Testing on Space Equipment(Institute of Electrical and Electronics Engineers, 2020-06-22) Fernández Romero, Sergio; Muñoz Rebate, I.; Jiménez Lorenzo, María; Plaza Gallardo, Borja; Poyatos Martinez, David; Díaz Michelena, Marina; Agencia Estatal de Investigación (AEI); Fernández Romero, S. [0000-0002-7169-2222]; Jiménez Lorenzo, M. [0000-0003-1243-6111]; Plaza Gallardo, B. [0000-0003-3615-0353]; Poyatos Martínez, D. [0000-0002-3829-5110]This letter addresses on the design of a planetary protection shell for performing the Electro-Magnetic Compatibility (EMC) tests of the Anisotropic Magneto-Resistance (AMR) sensor of the ExoMars mission. This mission has strict bio-burden requirements. The ElectroMagnetic (EM) properties of several materials have been investigated for measuring their transmission coefficients and the novelty of this letter is the use of Fused Deposition Modeling (FDM) technology as the production method. Additive manufacturing is presented as a promising technology in the field of radiofrequency since it can use a wide range of materials (including thermoplastics) with high and low transmission coefficient. The investigation comprises the analysis of the electromagnetic properties of several 3D printer materials in order to study their transmission coefficients. Seeing the EM characterization results, it was decided to produce a shell using FDM technology because it provides control over the grounding of the instrument and makes easier the integration, cleaning and protection against impacts during the operation, with great versatility and low cost. To finish, the shell has been proved during the acceptance EMC tests of the flight model and flight spare AMR instrument.Publicación Restringido Limitations in the Shielding Effectiveness Measurement Methods for Carbon Fiber Composites(Institute of Electrical and Electronics Engineers, 2021-04-12) Plaza Gallardo, Borja; Fernández Romero, Sergio; Gómez de Francisco, Patricia; Muñoz Rebate, I.; Ramos Somolinos, D.; Poyatos Martinez, David; Agencia Estatal de Investigación (AEI)Novel materials, as multi-ply carbon fiber composites (CFC), are increasingly used in the industry due to their outstanding mechanical properties in relation to their weight. In this regard, from the standpoint of electromagnetic compatibility (EMC), shielding effectiveness (SE) is a key parameter that often determines the scope for application of a given material. This article addresses the application of two complementary standards, ASTM D4935 and IEC 61000-4-21, to the SE measurement of different CFC test samples with more than 10 layers and a very large expected shielding. The analysis of the limitations encountered and the description of applied improvements on the traditional measurement procedures on each method are also included, showing promising results. On the other hand, there are alternative methods to evaluate the SE of CFC based on their DC square resistance. Consequently, and forthe shake of completeness, a novel setup for high precision measurement of the DC square resistance of CFC samples is also described along the article.
