73 research outputs found

    Modelización de la histéresis magnética y su aplicación al cálculo numérico en máquinas eléctricas

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    El presente documento es la tesis doctoral de Alfredo de Blas del Hoyo, dirigida por el Dr.Ing. Ram√≥n Bargall√≥ Perpi√Ī√°, realizada en el marco del programa de doctorado de Ingenier√≠a Electromec√°nica del Departamento de Ingenier√≠a El√©ctrica de la Universidad Polit√©cnica de Catalu√Īa. El trabajo de investigaci√≥n realizado trata sobre la modelizaci√≥n de la hist√©resis magn√©tica y su aplicaci√≥n al c√°lculo num√©rico. En concreto se trata de aportar un sistema de c√°lculo que permita considerar el efecto de la hist√©resis en la determinaci√≥n de la distribuci√≥n del campo magn√©tico en los n√ļcleos ferromagn√©ticos de las m√°quinas el√©ctricas. Lo aqu√≠ expuesto es f√°cilmente extrapolable a otros sistemas que empleen materiales ferromagn√©ticos.Se han analizado y comparado los modelos de hist√©resis m√°s difundidos. Fruto de la comparaci√≥n se ha elegido el modelo m√°s adecuado para nuestro √°mbito de aplicaci√≥n, el modelo de Preisach. Dicho modelo es analizado exhaustivamente, no solo en sus fundamentos y propiedades, sino que tambi√©n se comparan los diversos m√©todos de caracterizaci√≥n y desarrollo, determinando cual es la opci√≥n m√°s apropiada. Nuestra propuesta es el modelo de Preisach caracterizado por el m√©todo de Mayergoyz y desarrollado directamente a partir de su definici√≥n algebraica o bien mediante integrales de Everett.Bas√°ndonos en una idea de G. Bertotti, desarrollamos tambi√©n un modelo de Preisach din√°mico. Adem√°s proponemos un modelo de Preisach completamente inverso, necesario en problemas en los que la ecuaci√≥n de difusi√≥n del campo magn√©tico se formula en A-U.Para caracterizar el modelo de Preisach mediante el m√©todo de Mayergoyz hemos desarrollado un ensayo basado en el m√©todo bal√≠stico que permite obtener de una forma econ√≥mica los datos experimentales necesarios. Tambi√©n se investiga la forma de obtener estos datos experimentales mediante el m√©todo histeresigr√°fico, para ello desarrollamos un equipo autom√°tico controlado por ordenador que empleamos adem√°s para determinar llas caracter√≠sticas magn√©ticas de las muestras.La combinaci√≥n del modelo de Preisach con los m√©todos num√©ricos se realiza mediante una aplicaci√≥n, la determinaci√≥n del campo, flujo y p√©rdidas magn√©ticas disgregadas en el n√ļcleo de un transformador monof√°sico de 220V/380V y 1,3kVA.This document is the doctoral thesis of Alfredo de Blas del Hoyo, directed by Dr. Ram√≥n Bargall√≥ Perpi√Ī√°, made in the context of the doctorate program of Electromechanics Engineering of the Electric Engineering Department of the Polytechnic University of Catalonia.This researching work is about the modelization of the magnetic hysteresis and its application to numeric calculus. Actually it treats to contribute a calculus system that allows consider the effect of magnetic hysteresis on the determination of the magnetic field distribution inside the ferromagnetic cores of electric machines. This study is easy to extrapolate to other systems with ferromagnetic materials.We have analyzed and compared the most spread models of hysteresis. Result of this comparison we have chosen the model most suitable for our scope of application, the model of Preisach. This model is exhaustively analyzed, not only on its foundation and on properties, but several methods of characterization and development are compared. Our proposal is the Preisach model characterized by the method of Mayergoyz and developed directly from its algebraic definition or with Everett integrals.From an idea by G. Bertotti we develop a dynamic generalization of the model of Preisach. We propose also a full inverse model of Preisach. The inverse model is necessary in problems where the diffusion equation of magnetic field is formulated in A-U. To characterize the model of Preisach with the method of Mayergoyz we have developed a procedure based on the ballistic method that allows obtain in a cheap way the experimental data required. We also research the way to obtain this experimental data with the hysteresigraphic method, developing an automatic device controlled by computer. This device is also used to obtain the magnetic characteristics of the samples.The combination of the model of Preisach with numeric methods is carry out by means of an application, the determination of magnetic field, magnetic flux and core losses on a single - phase transformer of 1,3kVA and 220V / 380V

    Development of the safety code AINA for the European DEMO designs

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    In order to evaluate plasma evolution and in-vessel components strains, a safety code called AINA has been developing during the last ten years for different fusion reactors designs. This work describes the new AINA code which is being adapted for the four European DEMO designs (HCPB, DCLL, HCLL and WCLL) after an in-depth critical analysis of the former AINA versions with the purpose of performing a proper, reliable, versatile and flexible tool for the future safety studies. At this point, a new 0D plasma dynamics approach and a 1D finite-difference thermal model for the DEMO HCPB configuration and the divertor have been developed. By means of the feedback among both blocks, a preliminary safety analysis is carrying out checking the integrity of in-vessel components both when a plasma perturbation induces a Loss Of Plasma Control (LOPC) and a thermo-hydraulic accident takes place in the Plasma Facing Components (PFCs) or in the Vacuum Vessel such as a Loos Of Coolant Accident (LOCA). Initial results show deficiencies in the Blanket design which may be extremely significant when some of the described unexpected scenarios takes place leading the reactor to a melting episode.Peer ReviewedPostprint (published version

    Contribution to safety analyses of DEMO HCPB using AINA code

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    The motivation of the current work, framed under the safety EUROfusion activities to develop DEMO, is to present the conclusions drawn from our contribution to the safety studies of the HCPB DEMO carried out by the team tasked with AINA code development. During 2016 and 2017 a new AINA version was built in order to evaluate plasma evolution and in-vessel components strains inside the European DEMO designs. As a result, AINA is able to foresee several accident scenarios as plasma disruptions or structural meltings due to LOPCs (Loss Of Plasma Control) and in-vessel melt either of FW, blanket structure and/or divertor modules because of thermal stresses due to LOCAs. After due analysis, it has concluded that it would be desirable to carry out a design review focused on ensuring a suitable operating temperature range with a bigger safety margin for all the materials which make up the HCPB BB, as well as the need to guarantee a quick detection and actuation by means of a proper system, depending on the affected equipment, when the most demanding transients take place which may drive the reactor to melting scenarios and very energetic plasma disruptions. These events include an increase of fueling above 50%, a permanent improvement in the confinement time and a punctual impurity increase above 300%. Other perturbations has been studied which provide information on non-dangerous cases, impossible situations or melting processes.Peer ReviewedPostprint (author's final draft

    Development and assessment of fire-related risk unavailability matrices to support the application of the maintenance rule in a PWR nuclear power plant

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    Two methods are presented which serve to incorporate the fire-related risk into the current practices in nuclear power plants with respect to the assessment of configurations. The development of these methods is restricted to the compulsory use of fire probabilistic safety assessment (PSA) models. The first method is a fire protection systems and key safety functions unavailability matrix which is developed to identify structures, systems, and components significant for fire-related risk. The second method is a fire zones and key safety functions (KSFs) fire risk matrix which is useful to identify fire zones which are candidates for risk management actions. Specific selection and quantification methodologies have been developed to obtain the matrices. The Monte Carlo method has been used to assess the uncertainty of the unavailability matrix. The analysis shows that the uncertainty is sufficiently bounded. The significant fire-related risk is localized in six KSF representative components and one fire protection system which should be included in the maintenance rule. The unavailability of fire protection systems does not significantly affect the risk. The fire risk matrix identifies the fire zones that contribute the most to the fire-related risk. These zones belong to the control building and electric penetrations building.Peer ReviewedPostprint (published version

    Metodologia ‚Äúlearning by doing‚ÄĚ aplicada a l‚Äôensenyament pr√†ctic de les m√†quines el√®ctriques com a eina de suport al proc√©s d'adaptaci√≥ al nou model docent vinculat a l'Espai Europeu d'Ensenyament Superior

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    En l‚Äô√†rea de m√†quines el√®ctriques de l‚ÄôEscola Universit√†ria d‚ÄôEnginyeria T√®cnica Industrial de Barcelona (EUETIB) s‚Äôha dut a terme un projecte de millora i innovaci√≥ docent amb el finan√ßament de la Universitat Polit√®cnica de Catalunya (UPC) i l‚Äôajut del Departament d‚ÄôEnginyeria El√®ctrica. Un dels eixos principals dins del projecte de millora i innovaci√≥ en l‚Äô√†rea de m√†quines el√®ctriques ha estat el disseny d‚Äôuna nova metodologia activa de pr√†ctiques. La nova metodologia neix com a resultat de l‚Äôadaptaci√≥ de la metodologia ‚Äúlearning by doing‚ÄĚ a les especificitats del treball pr√†ctic de les assignatures de m√†quines el√®ctriques. El desenvolupament i implantaci√≥ d‚Äôaquesta metodologia activa centrada en l‚Äôestudiant ha obtingut uns resultats excel¬∑lents i ha estat una eina que ha perm√®s adaptar les assignatures de m√†quines el√®ctriques als nous models docents establerts per la UPC en el context de l‚ÄôEEES fent possible que els estudiants tinguin un paper m√©s actiu dins del proc√©s d‚Äôensenyament i aprenentatge

    Adaptaci√≥n de la metodolog√≠a PBL a la ense√Īanza de las energ√≠as renovables

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    La asignatura de libre elecci√≥n ‚ÄúEnerg√≠as renovables‚ÄĚ se imparte en ‚Äúl‚ÄôEscola Universit√°ria d‚ÄôEnginyeria T√®cnica Industrial de Barcelona‚ÄĚ, ‚ÄúCampus d‚ÄôUrgell‚ÄĚ de la Universidad Polit√©cnica de Catalu√Īa. La asignatura pretende acercar el campo de las energ√≠as renovables a los estudiantes de ingenier√≠a de la EUETIB, as√≠ como dar una visi√≥n gen√©rica de este tipo de energ√≠as en la actualidad. Es tambi√©n objeto de esta asignatura profundizar en el campo de la energ√≠a solar, sea t√©rmica o fotovoltaica, para ello se hace hincapi√© en los principales aspectos conceptuales de dichas instalaciones, en sus procesos de c√°lculo adaptados a la legislaci√≥n vigente, y en como legalizar dichas instalaciones. La metodolog√≠a utilizada, desde el a√Īo 2003, para impartir esta asignatura se basa en la metodolog√≠a PBL. En este art√≠culo describiremos las motivaciones que nos indujeron a introducir dicha metodolog√≠a, y c√≥mo la utilizaci√≥n de dicha metodolog√≠a ha incidido en la definici√≥n y desarrollo de los objetivos de la asignatura.Eje: Educaci√≥n universitaria: Experiencias educativasRed de Universidades con Carreras en Inform√°tica (RedUNCI

    Adaptaci√≥n de la metodolog√≠a PBL a la ense√Īanza de las energ√≠as renovables

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    La asignatura de libre elecci√≥n ‚ÄúEnerg√≠as renovables‚ÄĚ se imparte en ‚Äúl‚ÄôEscola Universit√°ria d‚ÄôEnginyeria T√®cnica Industrial de Barcelona‚ÄĚ, ‚ÄúCampus d‚ÄôUrgell‚ÄĚ de la Universidad Polit√©cnica de Catalu√Īa. La asignatura pretende acercar el campo de las energ√≠as renovables a los estudiantes de ingenier√≠a de la EUETIB, as√≠ como dar una visi√≥n gen√©rica de este tipo de energ√≠as en la actualidad. Es tambi√©n objeto de esta asignatura profundizar en el campo de la energ√≠a solar, sea t√©rmica o fotovoltaica, para ello se hace hincapi√© en los principales aspectos conceptuales de dichas instalaciones, en sus procesos de c√°lculo adaptados a la legislaci√≥n vigente, y en como legalizar dichas instalaciones. La metodolog√≠a utilizada, desde el a√Īo 2003, para impartir esta asignatura se basa en la metodolog√≠a PBL. En este art√≠culo describiremos las motivaciones que nos indujeron a introducir dicha metodolog√≠a, y c√≥mo la utilizaci√≥n de dicha metodolog√≠a ha incidido en la definici√≥n y desarrollo de los objetivos de la asignatura.Eje: Educaci√≥n universitaria: Experiencias educativasRed de Universidades con Carreras en Inform√°tica (RedUNCI

    Equipment for the continuous measurement and identification of gamma radioactivity on aerosols

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    © 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper describes an equipment for continuous measurement and identification of gamma radioactivity in aerosols developed by the Nuclear Engineering Research Group (NERG) at the Technical University of Catalonia (UPC) and Raditel Serveis i Subministraments Tecnològics, Ltd. A spectrometric analysis code has been specially designed for it. Spectrum analysis identifies and determines activity concentration of aerosol emitters captured by a fiberglass paper filter. This new equipment is currently operating in three radioactivity monitoring stations of the Environmental Radiological Surveillance Network of the Generalitat of Catalunya (local Catalan government): two near Ascó and Vandellòs Nuclear Power Plants in the province of Tarragona and one in the city of Barcelona. Two more monitors are expected to be deployed at Roses, Girona, Spain, and Puigcerdà, Barcelona, Spain. Measurements and evolution analysis results of emitters identified at these stations were also provided.Postprint (author's final draft

    A new code for spectrometric analysis for environmental radiological surveillance on monitors focused on gamma radioactivity on aerosols

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    ¬© 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper presents a new code for the analysis of gamma spectra generated by an equipment for continuous measurement of gamma radioactivity in aerosols with paper ¬Ņlter. It is called pGamma and has been developed by the Nuclear Engineering Research Group at the Technical University of Catalonia - Barcelona Tech and by Raditel Serveis i Subministraments Tecnol√≤gics, Ltd. The code has been developed to identify the gamma emitters and to determine their activity concentration. It generates alarms depending on the activity of the emitters and elaborates reports. Therefore it includes a library with NORM and arti¬Ņcial emitters of interest. The code is being adapted to the monitors of the Environmental Radiological Surveillance Network of the local Catalan Government in Spain (Generalitat de Catalunya) and is used at three stations of the Network.Postprint (author's final draft

    Results of the RAMI analyses performed for the IFMIF accelerator facility in the engineering design phase

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    This paper presents a summary of the RAMI (Reliability Availability Maintainability Inspectability) analyses done for the IFMIF (International Fusion Materials Irradiation Facility) Accelerator facility in the Engineering Design Phase. The methodology followed, the analyses performed, the results obtained and the conclusions drawn are described. Moreover, the consequences of the incorporation of the RAMI studies in the IFMIF design are presented and the main outcomes of these analyses are shown. (C) 2015 Elsevier B.V. All rights reserved.Postprint (author's final draft
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