Proyecto de Investigación: CARACTERIZACION ELECTROMAGNETICA Y ENSAYO DE FUSELAJES INTELIGENTES EN VEHICULOS AEREOS NO TRIPULADOS SOMETIDOS A EFECTOS AMBIENTALES ELECTROMAGNETICOS
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PID2019-106120RB-C32
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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.
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.
Novel electromagnetic characterization methods for new materials and structures in aerospace platforms
(Multidisciplinary Digital Publishing Institute (MDPI), 2022-07-23) Ramos Somolinos, D.; Plaza Gallardo, B.; Peñafield Moravec, Carolina; De la Torre Lejarraga, Antonia; Frövel, M.; Poyatos Martínez, D.; Cidrás Estévez, José; Ministerio de Ciencia e Innovación (MICINN)
The tendency over the last decades in the aerospace industry is to substitute classic metallic materials with new composite materials such as carbon fiber composites (CFC), fiber glass, etc., as well as adding electronic devices to ensure the safety and proper platform operation. Due to this, to protect the aircraft against the Electromagnetic Environmental Effects (E3), it is mandatory to develop accurate electromagnetic (EM) characterization measurement systems to analyze the behavior of new materials and electronic components. In this article, several measurement methods are described to assess the EM behavior of the samples under test: microstrip transmission line for a surface current analysis, free space to obtain intrinsic features of the materials and shielding effectiveness (SE) approaches to figure out how well they isolate from EM fields. The results presented in this work show how the different facilities from the National Institute of Aerospace Technology (INTA) are suitable for such purposes, being capable of measuring a wide variety of materials, depending on the type of test to be carried out.
Electromagnetic Characterization of Materials Through High Accuracy Free Space Measurements
(Institute of Electrical and Electronics Engineers, 2021-04-26) Poyatos Martínez, D.; Ramos Somolinos, D.; Plaza Gallardo, B.; Agencia Estatal de Investigación (AEI); Ministerio de Ciencia e Innovación (MICINN)
Aerospace or automotive industries employ novel composite or 3D printed 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, the development of a test bench with rod antennas for measurements in free space is presented. A complete design is described, from simulation analysis to validation measurements. The aim is to achieve robust measurements which allow the EM characterization of very diverse samples and materials, and high accuracy results that make possible to know the exact EM behaviour of these materials.
