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  • Cálculo de líneas y redes eléctricas

     Mujal Rosas, Ramon Maria
    Date of publication: 2013-12
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  • Control activo de ruido de baja recuencia de maquinaria industrial en un campo de baja densidad modal, mediante el encapsulado de sus fuentes de ruido  Open access

     Salueña Berna, Javier
    Universitat Politècnica de Catalunya
    Theses

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    En la reducción del ruido producido por maquinaria industrial, normalmente, se utilizan ciertas técnicas de reducción de ruido denominadas pasivas. Estas técnicas pueden aplicarse directamente sobre la fuente (uso de amortiguadores, silenciadores y de cerramientos), en el camino de transmisión (como aislamientos, pantallas, materiales de absorción y resonadores acústicos), o en el receptor (como el acondicionamiento acústico de locales o protectores auditivos). El problema de estas técnicas es que son poco efectivas para frecuencias graves y en las dificultades de ventilación de las máquinas en casos de cerramientos o en la aparición de pérdidas de carga en el caso de los silenciadores. En esta tesis se aplica una técnica diferente a la de tipo pasivo, denominada control activo de ruido, centrando su uso en el campo de la maquinaria industrial. El control activo se basa en la atenuación o eliminación de una onda sonora por interferencia destructiva. Aunque actualmente el control activo de ruido se utiliza comercialmente en algunas aplicaciones como tubos de ventilación, elementos de protección auditiva personal, cabinas de aviones¿, es poco utilizado en naves industriales donde las máquinas suelen emitir ruido grave y fuertemente tonal, lo que a priori son las condiciones idóneas para la utilización de dicho control.El problema consiste en que la maquinaria industrial se sitúa en el interior de naves industriales de grandes dimensiones y por tanto de alta densidad modal. Normalmente se pueden aplicar técnicas pasivas encapsulando totalmente la fuente con paneles de material absorbente y aislante. Pero a bajas frecuencias, encapsular no es sinónimo de reducir el nivel de ruido en el exterior ya que estos materiales en el rango de bajas frecuencias tienen muy bajo rendimiento de atenuación e incluso a las frecuencias de resonancia del encapsulamiento se puede llegar a aumentar el nivel sonoro en el exterior. Si se realiza el control activo no se consigue una reducción global (en todo el espacio) sino puntualmente cerca de los micrófonos de control.Esta tesis doctoral pretende demostrar que, introduciendo una fuente de ruido en un encapsulamiento adecuado se logra disminuir la densidad modal de su campo acústico, y por tanto, se puede conseguir la cancelación global por control activo del ruido generado por ésta en un recinto de grandes dimensiones, donde de forma directa sería totalmente imposible realizarlo por otros medios. Se ha realizado el modelo teórico del campo acústico producido en un recinto por una fuente encapsulada y se ha validado mediante mediciones de niveles de presión sonora en el interior y exterior del encapsulamiento para un altavoz. Con estas ecuaciones se ha estudiado el control activo y sus parámetros para una cancelación óptima en función de diferentes situaciones y aplicaciones. Se han realizado ensayos de control activo de un motor eléctrico encapsulado, se ha analizado los resultados comparándolos a los obtenidos con el modelo teórico, un altavoz o el propio motor sin encapsular, tanto en el interior del encapsulamiento como en el recinto exterior, corroborando la bondad del encapsulamiento activo. Se ha realizado una aplicación práctica de esta teoría en la cancelación por control activo del ruido de un ventilador de un ordenador personal.

    Normally, there are in use certain technologies of reduction of noise named passive, in the cancellation of the noise produced by industrial machinery. These technologies can be applied directly on the source (use of absorbers, mufflers and closings), in the way of transmission (as isolations, acoustic barriers, materials of absorption and acoustic sounders), or in the recipient (as the acoustic conditioning of locals or ear protective ). In this thesis, there is applied a technology different from that of passive type, named active control of noise, centring his use on the field of the industrial machinery.The active control is based on the attenuation or elimination of a acoustic wave by destructive interference. Though nowadays the active control of noise is in use commercial in some applications like air ducts, elements of auditory personal protection, cabins of planes ¿, it is occasionally used in industrial buildings, where the machines are in the habit of issuing serious and strongly tonal noise, what a priori, they are the suitable conditions for the utilization of the above mentioned control. The problem is that the industrial machinery places inside industrial buildings of big dimensions and therefore of high modal density. Normally passive technologies can be applied encasing totally the source with panels of absorbent and insulating material. But to low frequencies, to encase is not synonymous of reducing the level of noise in the exterior, since these materials in the range of low frequencies have very under performance of attenuation and enclosed to the resonance frequencies of the capsule is possible to come to increase the sonorous level in the exterior. If the active control is realized there is not obtained a global reduction (in the whole space) but punctually near the microphones of control. This doctoral thesis tries to demonstrate that, introducing a noise source in a suitable capsule is achieved to diminish the modal density of his acoustic field, and therefore, it is possible to obtain the global cancellation for active control of the noise generated by this one in an enclosure of big dimensions, where of direct form it would be totally impossible to realize it for other means. There has carried out the theoretical model of the acoustic field produced in an enclosure for an encased source and has been validated by means of level measurements of sonorous pressure in the interior and exterior of the encapsulamiento for a loudspeaker. With these equations the active control and his parameters have been studied for an ideal cancellation depending on different situations and applications. There have been realized tests of active control of an electrical encased engine, the results have been analyzed them comparing to the obtained ones with the theoretical model, a loudspeaker or the own engine without encasing, so much inside the capsule as in the exterior enclosure, corroborating the kindness of the active capsule. There has been realized a practical application of this theory in the cancellation by active control of the noise of a ventilator of a personal computer.

  • 16è Premi UPC a la Qualitat en la Docència Universitària

     Mujal Rosas, Ramon Maria
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  • XV Premios Nacionales de Ediciones Universitarias

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Colom Fajula, Xavier; Marin Genesca, Marcos
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  • Residuos industriales, sanitarios y agrícolas

     Mujal Rosas, Ramon Maria
    Date of publication: 2012-03-22
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  • Residuos industriales, sanitarios y agrícolas. Residus industrials, sanitaris i agrícoles

     Mujal Rosas, Ramon Maria; Marin Genesca, Marcos
    Date of publication: 2012
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  • Caracterización del comportamiento eléctrico, mecánico y térmico de compuestos poliméricos y con mezclas provenientes del reciclaje  Open access

     Marin Genesca, Marcos
    Department of Electrical Engineering, Universitat Politècnica de Catalunya
    Theses

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    This doctoral thesis studies the physical properties of polymeric composite materials, with the addition of ground tire rubber particles (GTR) and the use of any of these compounds for the electrical industry, either as a semiconductor, roofing, piping, insulation and stuffed in the world of electric cables or electric industry in general to provide an outlet for reusable materials from tires and give a new application is interesting for industry and also provide a solution to the serious problem of recycling such waste are as difficult to reuse the tires out of use. The difficulty to eliminate stocks of abandoned tires or store is a serious environmental problem. At present, various methods for recycling used tires, such as mechanical grinding, which separates the vulcanized rubber and steel fibers, using the rubber in many applications such as flooring, insulation, shoes, etc.. The carbon black is an important component in the tires with rates up to 30%, which is used to improve the behavior of these abrasive. This thesis investigates the electrical behavior (conductivity, permittivity, electric module, ...) of different composite materials obtained by mixing different polymers with different percentages of GTR (up to 70%) see their response depending on the amount of GTR, also depending on the frequency and temperature and see the potential feasibility for use in specific applications in the electric field. For this thesis are done different mixtures of materials (polymer insulators) with GTR to study the microstructural properties, thermal, mechanical and dielectric, by performing several tests: test DEA (impedance), test Drive Strain, Young's modulus, elongation at break, tensile strength, hardness, microstructure analysis by electron microscopy and thermal analysis by DSC testing of all compounds that have been made and conclusions drawn as to affect the incorporation tire dust in different proportions of GTR(0-5-10-20-40-50 and 70% ) and with different particle sizes (<200 µm, 200-500 µm,>500 µm). From then analyzes the information obtained from all the research done to extract conclusions, then analyzes the current regulations and how they might use some of the compounds analyzed by the electrical industry, and thus recovered difficult to recycle waste while helping to lower production costs by adding powder tires. In addition, this can mean that quantifies savings in the global market and the Spanish market while environmental factors are weighted, such as the CO2 emissions and the storage of this waste.

    A la present Tesi doctoral s'aborda l'estudi de propietats físiques de materials polimèrics compostos, amb l’addició de partícules neumàtic fora d’ús (NFU o GTR –en anglès-) triturat i l'aprofitament d'algun d'aquests compostos per a la indústria elèctrica, ja sigui com a semiconductor, cobertes, canalitzacions, aïllament i farcits, en el món dels cables elèctrics o la indústria elèctrica en general per donar sortida a materials reutilitzables provinents de pneumàtics fora d'ús i donar una nova aplicació que sigui interessant per a la indústria i alhora donar una solució al greu problema del reciclatge d'aquest tipus de residus de difícil reutilització com son els neumàtics fora d’ús. La dificultat per eliminar els estocs de pneumàtics abandonats o emmagatzemar constitueix un greu problema mediambiental. En l'actualitat, s'utilitzen diversos mètodes per al reciclatge de pneumàtics, com la trituració mecànica, en la qual se separa el cautxú vulcanitzat de l'acer i les fibres, utilitzant aquest cautxú en nombroses aplicacions com paviments, aïllants, calçat, etc. El negre de fum és un component important en els pneumàtics amb percentatges de fins al 30%, que s'utilitza per millorar el comportament abrasiu d'aquests. En aquesta tesi doctoral s'investiga el comportament elèctric (conductivitat, permitivitat, mòdul elèctric, ...) de diferents materials compostos obtinguts mitjançant la barreja de diferents polímers amb diferents percentatges de NFU (fins a un 70%), veure la seva resposta en funció de la quantitat de NFU, en funció també de la freqüència i de la temperatura i veure la possible viabilitat per a ser utilitzats en aplicacions concretes en l'àmbit elèctric. Per a la present tesi doctoral es realitzen diferents mescles de materials (polímers aïllants), amb NFU per estudiar les propietats microestructurals, tèrmiques, mecàniques i dielèctriques, mitjançant la realització de diversos assaigs: assaig DEA (espectroscòpia d'impedàncies), assaig Tracció-Deformació , Mòdul de Young, Allargament a la ruptura, Resistència a la Ruptura, Duresa, Anàlisi de Microestructura mitjançant Microscòpia Electrònica i anàlisi tèrmica mitjançant assaig DSC de tots els compostos que s'han realitzat, i s'extreuen conclusions de com afecta la incorporació de pols de pneumàtic en diferents proporcions (0-5- 10-20-40-50 i 70% de NFU) i amb mides de partícula diferents (<200 μm, 200-500 μm, >500 μm). A partir d'aquí s'analitza la informació obtinguda de tota la investigació realitzada per extreure conclusions, tot seguit s'analitza la normativa vigent actual i de quina manera es podria utilitzar algun dels compostos analitzats per a la indústria elèctrica, i així es valoritza un residu de difícil reciclatge al mateix temps que es contribueix a baixar costos de producció per addició de pols de Pneumàtic Fora d'Ús. A més es quantifica en que pot suposar aquest estalvi a nivell mundial i espanyol a la vegada que es ponderen factors mediambientals, com pot ser l'emissió de CO2 i l'emmagatzematge d'aquest residu.

  • Polainas de protección

     Mujal Rosas, Ramon Maria; Marin Genesca, Marcos
    Date of request: 2011-01-11
    Invention patent

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  • Fuentes de energía eléctrica: obra completa

     Mujal Rosas, Ramon Maria; Martínez, Vidal
    Date of publication: 2009-12-10
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  • Fuentes de energía eléctrica: DVD de animaciones

     Mujal Rosas, Ramon Maria
    Date of publication: 2009-12-10
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  • Fuentes de energía eléctrica: CD de contenidos

     Mujal Rosas, Ramon Maria
    Date of publication: 2009-12-10
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  • Elaboración de Materiales Multimédia

     Mujal Rosas, Ramon Maria
    XIII Congreso de Ingeniería en Organización
    Presentation's date: 2009-09-03
    Presentation of work at congresses

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  • Reconeixement tesis més consultades al TDX 2009

     Mujal Rosas, Ramon Maria
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  • Comportamiento Dielectrico en materiales compuestos PVC/NFU

     Colom Fajula, Xavier; Òrrit Prat, Jordi; Mujal Rosas, Ramon Maria; Nogues Morell, Francisco; Cañavate Avila, Francisco Javier; Carrillo Navarrete, Fernando
    Reunión del Grupo Especializado de Polímeros
    p. 180
    Presentation's date: 2009-09-21
    Presentation of work at congresses

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  • Elaboración de Materiales Multimédia

     Mujal Rosas, Ramon Maria
    XIII Congreso de Ingeniería en Organización
    p. 245-253
    Presentation's date: 2009-09-03
    Presentation of work at congresses

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  • Access to the full text
    Induction motor with spiral sheet rotor  Open access

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Colom Fajula, Xavier
    IEEE International Symposium on Industrial Electronics
    p. 529-537
    DOI: 10.1109/ISIE.2009.5219775
    Presentation's date: 2009-07-06
    Presentation of work at congresses

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    mprovements in torque at low currents using a rotor with spiral sheets are analyzed. Several rotors and stators have been built combining different constructive and mechanical characteristics of the related elements : inertias, constructive materials, geometrical shapes of the sheets and geometrical disposition of the sheets . These different types of motors have been simulated using computer aided tools and then tested in the laboratory. Finally, four stators (1000, 1500, 1500-type A, and 3000 rpm) with the same constructive parameters, have been simulated and tested with the following rotors types: solid rotor, solid rotor with diamagnetic rings, drag cup, and simple and double squirrel cage rotor; the results have been compared to those obtained with the seven variants of spiral sheet rotor presented in this paper.

  • Induction Motor with Spiral Sheet Rotor

     Mujal Rosas, Ramon Maria
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2009-07-07
    Presentation of work at congresses

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  • RECONEIXAMENT ALS MERITS DOCENTS D'ESPECIAL QUALITAT 2003-08

     Mujal Rosas, Ramon Maria
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  • Dielectric Properties of Ground Rubber Tire Composites

     Mujal Rosas, Ramon Maria
    China-Europe Symposium on Processing and Properties of Reinforced Polymers
    Presentation's date: 2009-06-10
    Presentation of work at congresses

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  • Dielectric properties of ground rubber tire composites

     Colom Fajula, Xavier; Mujal Rosas, Ramon Maria; Òrrit Prat, Jordi
    China-Europe Symposium on Processing and Properties of Reinforced Polymers
    p. 169
    Presentation's date: 2009-06-04
    Presentation of work at congresses

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  • Three-Phase Induction Motor with Spiral Sheet Rotor

     Mujal Rosas, Ramon Maria
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2008-07-05
    Presentation of work at congresses

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  • Access to the full text
    Three-phase induction motor with spiral sheet rotor  Open access

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol; Marin Genesca, Marcos
    IEEE International Symposium on Industrial Electronics
    p. 455-460
    DOI: 10.1109/ISIE.2008.4677186
    Presentation's date: 2008-06-05
    Presentation of work at congresses

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    Improvements on the torque with low currents using rotor with spiral sheets are analyzed. Several rotors and stators have been built combining different constructive and mechanical characteristics of the related elements: inertias, constructive materials, geometrical shapes of the sheets and geometrical disposition of the sheets. These different types of motors have been simulated using computer aided tools and then tested in the laboratory. Finally, four stators (1000, 1500, 1500-type A, and 3000 rpm) having the same constructive parameters, have been simulated and tested with the following rotors types: solid rotor, solid rotor with diamagnetic rings, drag cup, and simple and double squirrel cage rotor; these results have been compared to those obtained with the seven variants of spiral sheet rotor presented in this paper.

  • Laboratorio de física experimental mentora alsina

     Muñoz, Joan; Bidet, Roser; Mujal Rosas, Ramon Maria; Martínez, Vidal
    Date of publication: 2008-03-31
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  • Metodología docente para el cálculo de líneas eléctricas

     Mujal Rosas, Ramon Maria; Rolan Blanco, Alejandro; Marin Genesca, Marcos
    XVIII Reunión de Grupos de Investigación de Ingeniería Eléctrica
    p. 115-122
    Presentation's date: 2008-03-13
    Presentation of work at congresses

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  • REDLIN software: cálculo de líneas y redes eléctricas

     Mujal Rosas, Ramon Maria; Rolan Blanco, Alejandro
    Date of publication: 2008-02
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  • Reconeixement a la tesis mes consultada Xarxa TDX a l'any 2008

     Mujal Rosas, Ramon Maria
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  • Electromagnetic Analysis of the Induction Motor with Spiral Sheet Rotor

     Mujal Rosas, Ramon Maria
    European Conference on Power Electronics and Applications
    Presentation's date: 2007-09-04
    Presentation of work at congresses

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  • Improvement of the Three-Phase Induction Motor with Spiral Sheet Rotor

     Mujal Rosas, Ramon Maria
    IEEE International Symposium on Industrial Electronics
    Presentation's date: 2007-06-05
    Presentation of work at congresses

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  • Guía para la elaboración de materiales multimedia

     Mujal Rosas, Ramon Maria
    XVII Reunión de Grupos de Investigación de Ingeniería Eléctrica
    Presentation's date: 2007-03-29
    Presentation of work at congresses

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  • Guía para la elaboración de materiales multimedia

     Mujal Rosas, Ramon Maria
    XVII Reunión de Grupos de Investigación de Ingeniería Eléctrica
    Presentation's date: 2007-03-30
    Presentation of work at congresses

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  • Improvement of the Three-Phase Induction Motor with Spiral Sheet Rotor

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol
    IEEE International Symposium on Industrial Electronics
    Presentation of work at congresses

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  • 10 Premi a la Qualitat de la docència Universitària

     Colom Fajula, Xavier; Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol
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  • Reconeixement a la tesis mes consultada Xarxa TDX el 2007

     Mujal Rosas, Ramon Maria
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  • X PREMI QUALITAT DOCENT UPC

     Mujal Rosas, Ramon Maria
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  • CERTIFICAT RECONEIXAMENT TESIS DOCTORALS EN XARXA

     Mujal Rosas, Ramon Maria
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  • Premio Baleares al mejor artículo revista Técnica Industrial

     Mujal Rosas, Ramon Maria
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  • Electromagnetic Analysis of the Induction Motor with Spiral Sheet Rotor

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol
    European Conference on Power Electronics and Applications
    Presentation of work at congresses

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  • Analysis and Improvement of the three-phase induction motor with spiral sheet rotor

     Mujal Rosas, Ramon Maria
    9th Internacional Conference on Electrical Machines and Systems
    Presentation's date: 2006-11-22
    Presentation of work at congresses

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  • Electrical Energy Sources

     Mujal Rosas, Ramon Maria
    International Conference on Engineering Education in Sustainable Development
    Presentation's date: 2006-10-04
    Presentation of work at congresses

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  • Analysis of the three-phase induction motor with spiral sheet rotor

     Mujal Rosas, Ramon Maria
    XVII International Conference on Electrical Machines
    Presentation's date: 2006-09-04
    Presentation of work at congresses

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  • Guía Elaboración Material Multimèdia

     Mujal Rosas, Ramon Maria
    International Conference on Industrial Engineering and Industrial Management
    Presentation's date: 2006-09-08
    Presentation of work at congresses

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  • Elaboración Material Multimèdia

     Mujal Rosas, Ramon Maria
    Congrés Internacional de Docència Universitària i Innovació
    p. 89-92
    Presentation's date: 2006-07-05
    Presentation of work at congresses

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  • Elaboración Material Multimèdia

     Mujal Rosas, Ramon Maria
    Congrés Internacional de Docència Universitària i Innovació
    Presentation's date: 2006-07-06
    Presentation of work at congresses

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  • Cuchilla para Màquinas Destrozadoras

     Mujal Rosas, Ramon Maria; Marin Genesca, Marcos; Castellot, Miguel Angel Marín
    Date of request: 2006-07-16
    Invention patent

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  • Dispositivo de Protección Corporal

     Mujal Rosas, Ramon Maria; Marin Genesca, Marcos; Castellot, Miguel Angel Marín
    Date of request: 2006-07-16
    Invention patent

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  • Elaboración Multimedia Fuentes de Energía Eléctrica

     Mujal Rosas, Ramon Maria
    XVI Reunión de Grupos de Investigación de Ingeniería Eléctrica
    Presentation's date: 2006-04-06
    Presentation of work at congresses

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  • Elaboración DVD Fuentes de Energía Eléctrica

     Mujal Rosas, Ramon Maria; Boix Aragonès, Oriol
    VI Congreso Internacional Virtual de Educación
    Presentation's date: 2006-02-06
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  • Proyectos Fuentes de Energía, Residuos Industriales, Sanitarios y Agrícolas y laboratorio Histórico de Física

     Mujal Rosas, Ramon Maria
    Jornada d'Innovació Docent UPC
    Presentation's date: 2006-02-28
    Presentation of work at congresses

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  • Elaboración DVD Fuentes de Energía Eléctrica

     Mujal Rosas, Ramon Maria
    VI Congreso Internacional Virtual de Educación
    Presentation's date: 2006-02-18
    Presentation of work at congresses

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