Proyecto de Investigación: EVALUACION NUMERICA Y EXPERIMENTAL DE EFECTOS ELECTROMAGNETICOS AMBIENTALES EN AVIONES NO TRIPULADOS
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ID
TEC2016-79214-C3-1-R
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Publicaciones
Characterization of Joints between Carbon Fiber Composite Parts Using a Microstrip Transmission Line Method
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-02-06) Plaza Gallardo, B.; López, D.; Poyatos Martínez, D.; Agencia Estatal de Investigación (AEI)
The electromagnetic performance of aerial platforms, which are composed mostly of nonmetallic materials, is a subject of great interest at present time. The behavior of this type of composite structure against electromagnetic environmental effects (E3), such as lightning, is not well-studied as in the case of metalic structures. The purpose of this article is to characterize the joints present in aerial platforms constructed mainly of nonmetallic composite materials. The study of these joints is fundamental because electrical discontinuities or preferential routes can produce changes in the electromagnetic behavior of an aircraft. The proposed measurement system for the characterization of these joints is a microstrip line. The flexibility of the test setup allows for evaluation of different joints in carbon fiber composite (CFC) samples with a different number of plies. Additionally, approximated models of the behavior of the joints as well as the detection of possible defects in the joining process are reported.
Design of a planetary protection cover for EMC testing of a spacial magnetic sensor
(Institute of Electrical and Electronics Engineers, 2019-10-17) Fernández Romero, S.; Parrondo, M. C.; Díaz Michelena, M.; Muñóz Rebate, I.; León Calero, Marina; Martín Iglesias, S.; Plaza Gallardo, B.; Escot Bocanegra, D.; Poyatos Martínez, D.; Jiménez Lorenzo, María; López Sanz, Daniel; Ministerio de Economía y Competitividad (MINECO); Agencia Estatal de Investigación (AEI)
This paper explains the research process carried out for the development and manufacture of the planetary protection cover for carrying out the electromagnetic compatibility (EMC) tests of the an-isotropic magneto-resistance (AMR) sensor of the ExoMars 2020 mission. This mission has strict bioburden requirements. The electromagnetic properties of several materials have been analyzed in order to study their transmission coefficient and the innovation of this project is the use of fused deposition modeling (FDM) technology as manufacturing method. Additive manufacturing is presented as a promising technology in the field of radiofrequency since it can use a wide range of polymeric materials (thermoplastics) with low transmission coefficient. Observing the electromagnetic (EM) characterization results, it was decided to manufacture a protective cover using FDM technology, because it allows control over the grounding of the instrument and facilitates the integration, cleaning and protection against impacts during the manipulation, with great versatility and low cost. Finally, the cover has been verified during the acceptance EMC tests of the flight model AMR instrument.
Limitations in the Shielding Effectiveness Measurement Methods for Carbon Fiber Composites
(Institute of Electrical and Electronics Engineers, 2021-04-12) Plaza Gallardo, B.; Gómez de Francisco, P.; Fernández Romero, S.; Muñoz Rebate, I.; Ramos Somolinos, D.; Poyatos Martínez, D.; 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.
Coupling Analysis Under Ligthning Indirect Effects For Cable Bundles With Different Ground Plates In Unmanned Aerial Vehicles
(Institute of Electrical and Electronics Engineers, 2021-10-19) Ramos Somolinos, D.; Morales Blanco, C.; López Sanz, Daniel; Plaza Gallardo, B.; Poyatos Martínez, D.; Ministerio de Ciencia e Innovación (MICINN); Agencia Estatal de Investigación (AEI)
It is increasingly common in aerospace industries to take advantage of novel composite materials in their manufacturing processes to improve performance and reduce costs. Obtaining the electromagnetic (EM) characterization of these materials or a combination of them is essential to ensure safety and EM compatibility.In this paper, a laminate of the central fuselage of an aircraft developed at INTA is recreated. This aircraft is called MILANO and it is mostly made of Carbon Fiber Composite (CFC). The same material is used for the laminate. Besides, another metallic plate is built in order to compare the performance of the former one with respect to a Perfect Electric Conductor (PEC). The main goal of this work is studying the coupling between the cable bundles embedded in the MILANO and how is this affected by the different materials of the ground plate (metal and CFC). Two kind of tests are carried out: S-parameters measurents and injection of Lightning Indirect Effect (LIE) waveforms. S-parameters results are then obtained through simulation too and compared with both the metallic and the CFC sample.
Comparing Open Area Test Site and Resonant Chamber for Unmanned Aerial Vehicle's High-Intensity Radiated Field Testing
(Institute of Electrical and Electronics Engineers, 2018-01-18) Fernández Romero, S.; López Rodríguez, P.; Escot Bocanegra, D.; Poyatos Martínez, D.; Añón Cancela, M.; Ministerio de Economía y Competitividad (MINECO); Agencia Estatal de Investigación (AEI)
Open area test sites (OATS) have been traditionally employed for aircraft electromagnetic compatibility certification tests because of the large size of these items. In this regard, unmanned aerial vehicles (UAVs) have emerged in the last years and, albeit being sometimes notably smaller, yet they have to accomplish for the same certification process. This paper investigates into the possibility of using a reverberation chamber for performing two aircraft low-level coupling tests, namely, low-level direct drive and low-level swept fields, and compares the results with those obtained in an OATS, in both cases using a representative part of a UAV.
