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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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 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 Restringido UAVEMI project: Numerical and experimental EM immunity assessment of UAV for HIRF and lightning indirect effects(Institute of Electrical and Electronics Engineers, 2016-07-07) García, Salvador G.; Silva, F.; Escot Bocanegra, D.; Pascual, Enrique; Pantoja, M. F.; Riu, Pere J.; Añón Cancela, M.; Álvarez, J.; Cabello, M.; Pous, M.; Fernández Romero, Sergio; Trallero Vela, R.; Poyatos Martinez, David; Nuño, L.; Instituto Nacional de Técnica Aeroespacial (INTA)The UAVEMI project, funded by the Spanish Ministry of Economy and Competitiveness, gathers a consortium formed by several research and development institutions and one industrial partner. The main goal is to develop innovative experimental and numerical approaches for the assessment of the electromagnetic compatibility of unmanned air vehicles, under high intensity radiated fields, lightning indirect effects and non-nuclear electromagnetic pulses. This contribution describes the capabilities currently being developed under the project.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.Publicación Restringido Anisotropic magnetoresistance (AMR) instrument to study the Martian magnetic environment from the surface: expected scientific return(Springer Link, 2023-08-15) Díaz Michelena, Marina; Rivero Rodríguez, Miguel Ángel; Fernández Romero, Sergio; Adeli, Solmaz; Oliveira, Joana S.; Henrich, Clara; Aspás, Alberto; Parrondo, María Concepción; Instituto Nacional de Técnica Aeroespacial (INTA); Centros de Excelencia Severo Ochoa, BARCELONA SUPERCOMPUTING CENTER (BSC), SEV2015-0493The ExoMars programme has the objective to answer to the question of whether life ever existed on Mars. The second mission comprising the Rosalind Franklin rover and Kazachok Surface Platform was designed to focus specifically on the characterization of the environmental parameters which can play an important role for the existence of life on the surface of the planet. One of these parameters is the magnetic field because of its ability of shielding the solar and cosmic radiation. For such characterization, the scientific suite of the Surface Platform counts with two instruments: the Anisotropic MagnetoResistance (AMR) and the MArtIan Ground ElectromagneTic (MAIGRET) instruments. The AMR goal is to characterize both the surface and subsurface and the time-varying magnetic fields, related to the crustal and the external fields respectively, at the ExoMars landing site in Oxia Planum. The operation to achieve these goals includes two phases, the first phase corresponding to the lander descent and the second phase in which the instrument is deployed on the surface. In this work, we simulate the first operations phase using synthetic magnetic field models, assuming that the different crustal units at the landing site might be magnetized. We also perform measurements in our laboratory to simulate the second phase operation of the instrument on the Martian surface. We discuss the capability of interpretation of the instrument, based on the available information of the landing site and the results from our models.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 A shielding effectiveness prediction method for coupled reverberant cavities validated on a real object(Taylor and Francis online, 2015-07-25) Fernández Romero, Sergio; Gutierrez, Guadalupe G.; González, Iván; Ministerio de Economía y Competitividad (MINECO)In the last years, different works on reverberant microwave propagation and high frequency coupling inside oversized structures have been published in order to make progress in the investigation of wireless systems and electromagnetic threats. In this paper, a new focus to the shielding effectiveness (SE) prediction using the reverberation microwave propagation formalism has been applied to a real complex object attaining very good agreement with the measured data obtained from nested reverberation chamber method. The used formalism is the combination of the simplified propagation model with the updated and more accurate formulation for cavity Q-factor and energy dissipation mechanisms. A very wide frequency range, from 500 MHz to 40 GHz, has been analyzed, which allows us to draw conclusions about how each parameter affects the final SE result at different frequency bands. Furthermore, a tuning study has been performed taking into account the tolerance in the most important parameters, such as the cavity size, the Q-factor, the main dissipation energy mechanisms, and the aperture shapes.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 Limitations in the Shielding Effectiveness Measurement Methods for Carbon Fiber Composites(Institute of Electrical and Electronics Engineers, 2021-04-12) Plaza Gallardo, Borja; Gómez de Francisco, Patricia; Fernández Romero, Sergio; 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.
