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Fernández Bermejo, Daniel

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2015 - 201992020 - 202410
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Mostrando 1 - 10 de 19
  • No hay miniatura disponible
    Publicación
    Sobre el bien o bienes jurídicos protegidos de los artículos 379.2 (inciso primero) y 383 del Código penal. su relación concursal
    (Iustel, 2016) Fernández Bermejo, Daniel
    El presente trabajo trata de escudriñar el bien o bienes jurídicos protegidos en los delitos de los artículos 379.2, inciso primero, y 383 del Código Penal, paralelos y divergentes en el ámbito de la Seguridad Vial, a tenor de la amplia controversia generada doctrinal y jurisprudencialmente, realizando un recorrido normativo desde sus orígenes, hasta los comentarios más recientes. Así mismo, se relacionarán ambos tipos penales por la conexión que presentan entre sí en su exteriorización práctica, manifestando los distintos criterios de aplicación de las normas ante la ponderación concursal de estos delitos.
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    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, Álvaro
    Roller 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.
  • Miniatura
    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 María
    This 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.
  • Miniatura
    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 María
    This 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.
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    Publicación
    Algunas cuestiones sobre el tipo básico y la conducta defraudatoria exigida en el delito fiscal
    (Thomson Reuters Aranzadi, 2018-07) Fernández Bermejo, Daniel
    En el presente estudio se pretende analizar el tipo básico del delito fiscal, adentrándose en las distintas formas comisivas que pueden tener lugar, el concepto específico de defraudación como exigencia del tipo y la consumación del delito. Todo ello desde una visión práctica y jurisprudencial, la cual constituye la esencia del contenido del análisis que se presenta.
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    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 María
    Multi-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.
  • Miniatura
    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 María
    This 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.
  • Miniatura
    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 María
    This 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.
  • Miniatura
    Publicación
    Algunas cuestiones relativas al delito de negativa a someterse a las pruebas de medición de alcohol y drogas
    (Universidad de Alcalá, 2016) Fernández Bermejo, Daniel
    El presente estudio pretende analizar los elementos del delito de negativa a someterse a las pruebas de medición de alcohol y drogas por parte del conductor de un vehículo de motor, ante el requerimiento de un agente de la autoridad debidamente cualificado y en el ejercicio de sus funciones públicas, desde el ámbito del derecho penal. Se estudian, así mismo, la naturaleza jurídica y el bien jurídico protegido de esta infracción penal, con el respeto de los principios constitucionales reconocidos por la Carta Magna, y la relación existente entre la negativa a someterse a las pruebas establecidas del artículo 383 del Código Penal y la conducción bajo la influencia del alcohol, introduciendo algunas notas relativas la cuestión concursal.
  • Miniatura
    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, Álvaro
    Roller 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.