Persona: Fernández Bermejo, Daniel
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Publicación Predictive Analytics-Based Methodology Supported by Wireless Monitoring for the Prognosis of Roller-Bearing Failure(MDPI, 2024-06-17) Primera, Ernesto; Cacereño, Andrés; Fernández Bermejo, Daniel; Rodríguez Prieto, ÁlvaroRoller mills are commonly used in the production of mining derivatives, since one of their purposes is to reduce raw materials to very small sizes and to combine them. This research evaluates the mechanical condition of a mill containing four rollers, focusing on the largest cylindrical roller bearings as the main component that causes equipment failure. The objective of this work is to make a prognosis of when the overall vibrations would reach the maximum level allowed (2.5 IPS pk), thus enabling planned replacements, and achieving the maximum possible useful life in operation, without incurring unscheduled corrective maintenance and unexpected plant shutdown. Wireless sensors were used to capture vibration data and the ARIMA (Auto-Regressive Integrated Moving Average) and Holt–Winters methods were applied to forecast vibration behavior in the short term. Finally, the results demonstrate that the Holt–Winters model outperforms the ARIMA model in precision, allowing a 3-month prognosis without exceeding the established vibration limit.Publicación Data analytics-driven selection of die material in multimaterial co-extrusion of Ti-Mg alloys(MDPI, 2024-03-10) Fernández Bermejo, Daniel; Rodríguez Prieto, Álvaro; Camacho López, Ana MaríaAbstract: Selection of the most suitable material is one of the key decisions to be taken at the design stage of a manufacturing process. Traditional approaches as Ashby maps based on material properties are widely used in the industry. However, in the production of multimaterial components, the criteria for the selection can include antagonistic approaches. The aim of this work is the implementation of a methodology based on the results of process simulations for several materials and classify them by applying an advanced data analytics method based on Machine Learning (ML), in this case the Support Vector Regression (SVR) and Multi-Criteria Decision Making (MCDM) meth- odologies, specifically Multi-criteria Optimization and Compromise Solution (VIKOR) combined with Entropy weighting methods. In order to do this, a Finite Element Model (FEM) has been built to evaluate the extrusion force and the die wear in a multi-material co-extrusion process of bimetallic Ti6Al4V-AZ31B billets. After applying SVR and VIKOR combined with Entropy weighting methodologies, a comparison has been established based on the material selection and complexity of the methodology used, resulting that material chosen in both methodologies is very similar and MCDM method is easier to implement because there is no need of evaluate the error of the prediction model and the time for data preprocessing is less than the time needed in SVR. This new methodology is proven to be effective as alternative to the traditional approaches and aligned with the new trends in the industry based on simulation and data analytics.Publicación Optimal Parameters Selection in Advanced Multi-Metallic Co-Extrusion Based on Independent MCDM Analytical Approaches and Numerical Simulation(MDPI, 2022-11-28) Fernández Bermejo, Daniel; Rodríguez Prieto, Álvaro; Camacho López, Ana MaríaMulti-material co-extrusion is a complex thermo-mechanical forming process used to obtain bimetallic billets. Its complexity is due to the combination of diffusion phenomena in the interface of both materials together with the high temperature and pressure generated and the different flow stress characteristics created by the joining of dissimilar materials. Accordingly, the selection of optimal process parameters becomes key to ensure process feasibility. In this work, a comparison among different multi-criteria decision making (MCDM) methodologies, together with different eighting methods, were applied to the simulation results by using DEFORM3D© software to select the optimal combination of process parameters to fulfil the criteria of minimum damage, extrusion force, and tool wear, together with the maximum reduction in the average grain size.Publicación Analysis of AZ31B -Ti6Al4V bimetallic extrusion by numerical simulation and Taguchi method(Cambridge University Press, 2021-06-23) Fernández Bermejo, Daniel; Rodríguez Prieto, Álvaro; Camacho López, Ana MaríaThis paper investigates the extrusion force and damage induced during an extrusion process to manufacture bimetallic cylinders combining a titanium alloy sleeve (Ti6Al4V) and a magnesium alloy core (AZ31B). A study has been carried out to determine the damage factor distribution through the extrusion process and how this factor together with the extrusion force are influenced by the manufacturing parameters (extrusion ratio, friction and die semi-angle) by means of finite element (FE) simulations. Also, a Taguchi Design of Experiments (DoE) and an Analysis of Variance (ANOVA) have been performed in order to study the influence of each parameter to minimize the extrusion force needed to perform the process and the damage in the extrudate. The results show that damage distribution in the sleeve does not follow any pattern, appearing in different region in a random way. However, in the core the damage always occurs in the region outside the contour of the sleeve, where it reaches the maximum value and afterwards remains stationary during the rest of the process. In the core, damage increases as friction factor does and it is independent of the cross-section reduction for low die semi-angles (15°) and reaches the maximum values for 60° die semi-angle. In both cases, damage and extrusion force, the more relevant factor to obtain minimum values is the die semi-angle.Publicación Selection of die material and its impact on the multi-material extrusion of bimetallic AZ31B–Ti6Al4V components for aeronautical applications(MDPI, 2021-12-09) Fernández Bermejo, Daniel; Rodríguez Prieto, Álvaro; Camacho López, Ana MaríaThis paper investigates the effect that the selection of the die material generates on the extrusion process of bimetallic cylindrical billets combining a magnesium alloy core (AZ31B) and a titanium alloy sleeve (Ti6Al4V) of interest in aeronautical applications. A robust finite element model is developed to analyze the variation in the extrusion force, damage distribution, and wear using different die materials. The results show that die material is a key factor to be taken into account in multi-material extrusion processes. The die material selection can cause variations in the extrusion force from 8% up to 15%, changing the effect of the extrusion parameters, for example, optimum die semi-angle. Damage distribution in the extrudate is also affected by die material, mainly in the core. Lastly, die wear is the most affected parameter due to the different hardness of the materials, as well as due to the variations in the normal pressure and sliding velocity, finding critical values in the friction coefficient for which the die cannot be used for more than one forming stage because of the heavy wear suffered. These results can potentially be used to improve the efficiency of this kind of extrusion process and the quality of the extruded part that, along with the use of lightweight materials, can contribute to sustainable production approaches.Publicación El encierro tiene género: la privación de libertad de mujeres y niñas en la normativa penitenciaria y penal de menores española(Lustel, 2020-11) Cámara Arroyo, Sergio; Fernández Bermejo, DanielEn el presente estudio se ofrece una panorámica penitenciaria sobre la situación práctica y actual de las mujeres reclusas en nuestros establecimientos penitenciarios; así como de las menores de edad en centros de internamiento. Y ello desde la propia normativa penal y penitenciaria general y específica para esta clase de delincuentes. De igual manera se analizan pormenorizadamente datos estadísticos procedentes de las más recientes fuentes oficiales publicadas para, finalmente, aportar propuestas de mejora en la práctica regimental y tratamental en el espacio intramuros, ofreciendo alternativas relativas a la ejecución de la privación de libertad de las mujeres y niñas encerradas.Publicación Algunas propuestas de lege ferenda para la inhumana pena de prisión permanente revisable(Ministerio del Interior: Dirección General de Instituciones Penitenciarias, 2020) Fernández Bermejo, DanielPublicación El denominado delito contable del artículo 310 del Código Penal. Análisis penal, doctrinal y jurisprudencial(Centro de Estudios Financieros - CEF, 2021-08) Fernández Bermejo, DanielEl delito contable constituye un tipo penal con distintas modalidades delictivas, y a su vez se ubica en el específico capítulo relativo a los delitos contra la Hacienda Pública. Con el presente trabajo se trata de analizar los elementos penales de esta infracción penal en toda su extensión, con una aportación doctrinal, jurisprudencial y personal; ofreciendo criterios de interpretación del precepto así como algunos problemas casuísticos que se han planteado a lo largo de los últimos años.Publicación La "inexistente" profesion de asesor fiscal y su implicación como sujeto obligado en materia de prevención de blanqueo de capitales(Thomson Reuters Aranzadi, 2022) Fernández Bermejo, DanielEn el presente trabajo se pretende denunciar la ausencia normativa e institucional de la profesión consistente en la asesoría fiscal. Al no existir requisitos para su ejercicio profesional ni un Colegio Profesional que delimite las funciones, derechos y obligaciones de estos profesionales, se aprecia cierta inseguridad jurídica al poder ofrecerse como asesor fiscal cualquier persona, aún sin gozar de una formación específica. De igual manera se estudiarán las obligaciones que la normativa de prevención de blanqueo de capitales asigna a los asesores fiscales, como "sujetos obligados" a comunicar cualquier sospecha o indicio que pueda adentrarse en el círculo vicioso del blanqueo, al Servicio Ejecutivo de la Comisión de Prevención del Blanqueo de Capitales.Publicación Algunas cuestiones sobre el régimen cerrado, clasificación en primer grado y actuaciones de la administración penitenciaria frente a la radicalización violenta yihadista(lustel, 2023) Fernández Bermejo, DanielEn este trabajo se pretende analizar los elementos característicos del régimen cerrado en prisión, así como el proceso de clasificación y su prácticamente automática clasificación en primer grado penitenciario de aquellos condenados por delitos de terrorismo, con las limitaciones y restricciones regimentales que dicho grado conlleva. De igual manera, se expondrán algunas ideas del “nuevo terrorismo”, describiendo las características y comportamiento en prisión de los terroristas yihadistas, así como la influencia en otros internos que ha acechado en nuestras prisiones y que se conoce como el fenómeno de la radicalización. Finalmente se analizará el plan de actuación de la administración penitenciaria contra la radicalización así como el programa de intervención con internos islamistas.