http://hdl.handle.net/2117/3365 2013-06-19T03:27:14Z http://hdl.handle.net/2117/18544 Title: Self-video recording for the integration and assessment of generic competencies Authors: Masip Álvarez, Albert; Hervada Sala, Carme; Pàmies Gómez, Teresa; Arias Pujol, Antoni; Jaen Fernandez, Carles; Rodríguez Sorigué, M. Cristina; Romero Durán, David; Nejjari Akhi-Elarab, Fatiha; Álvarez del Castillo, María Dolores; Roca Lefler, Marta; Hernández Farràs, Jorge; Montferrer Liñan, Raul Abstract: This document presents the use of a self-video-recording service for the integration and assessment of certain generic competences (oral and written communication, teamwork and third (English) language) in all degree programs related to the Industrial area at the Terrassa School of Engineering (EET). The resulting service allows to carry out the assessment through active and collaborative learning methodologies using ICT as a support, becoming an educational resource where students are encouraged to evaluate their own activity, individually and in groups (co-evaluation), and with which the faculty can enhance certain sections of the syllabus while also evaluating generic competences. This paper outlines the rationale and design of the system based on self-recording-video that assists work on some generic competences. A preliminary experience has taken place and it has been carried out by volunteer students and some professors from the promoting team. It consisted of following all steps to obtain the video-recording as a result and fulfil the further assessment. Preparing the defence of the final project career, explaining the way a problem is faced are examples of use of the service endowed to assist the assessment of some generic competences. A good number of students and professors have participated in this preliminary experiment carried out on some subjects and in which oral effective communication will be assessed. A specific rubric for the assessment of generic competences has been used both for students and faculty. There is a summary of qualitative feedback from both students and instructors, and where several issues related to improving the self-assessment and self-video-recording system, are discussed. Finally, a survey is proposed, whose results will be helpful for its improvement. 2013-04-02T14:02:57Z http://hdl.handle.net/2117/17438 Title: Impacto acústico generado como consecuencia de la implantación de un skate park Authors: Jiménez Diaz, Santiago; Romeu Garbí, Jordi; Alsina Sánchez, Antoni Abstract: Un skate park es una instalación singular formada por un conjunto de elementos y obstáculos, fuentes sonoras potenciales, que se imlpanta en un entorno urbano abierto. El estudio de impacto acústico de este tipo de actividad no se puede realizar por evaluación de una actividad respecto de los receptores será diferente en cada caso. El cálculo por simulación permite incluir todas estas variables, pero requiere tener previamente la potencia acústica radiada y la directividad de cada fuente sonora (actividad del patinador sobre el elemento y obstáculo) de que consta la instalación del skate park. Una vez caracterizadas las fuentes de ruido, usando los datos topográficos y meteorólogicos del lugar, se determinan mediante simulación informática, los niveles de inmisión sonora procedentes de las diferentes fuentes del skate park que llegan a la fachada de los receptores. 2013-01-21T13:49:43Z http://hdl.handle.net/2117/14717 Title: On the power and frequency of auditory signals on emergency vehicles Authors: Balastegui Manso, Andreu; Romeu Garbí, Jordi; Clot Razquin, Arnau; Martín Román, Sara-Regina Abstract: Sirens from emergency vehicles are particularly annoying for people living in the vicinities of hospitals. The power regulations for sirens vary for different countries as well as it does their frequency content. In order to reduce their annoyance the present work computes the optimal output power and frequencies of the siren by taking into account the car's sound insulation, the background noise inside the car and the masked threshold of hearing. The combination of these parameters gives rise to frequency windows where the sirens are more effective, so new tones are proposed and their annoyance is assessed through a jury test procedure. 2012-01-20T16:18:43Z http://hdl.handle.net/2117/13449 Title: Aplicación de la técnica de emisión acústica (EA) para auscultación en diversos tipos de materiales y estructuras Authors: Martínez González, Eva; Gallego Molina, Antolino; Infantes Vázquez, Cristobal; Benavent Climent, Amadeo; Morillas Romero, Leandro; Martínez Jequier, José; Juanes, Javier; Valea Pérez, Ángel 2011-10-06T08:40:24Z http://hdl.handle.net/2117/10834 Title: Planes específicos para la reducción de la contaminación acústica de la ciudad de Terrassa Authors: Jiménez Diaz, Santiago; Romeu Garbí, Jordi; Genesca Francitorra, Meritxell; Alsina Sánchez, Antoni Abstract: La Directiva 2002/49 sobre evaluación y gestión del ruido ambiental contempla la adopción de planes de acción, tomando como base los resultados de los mapas estratégicos del ruido, con vistas a prevenir y reducir el ruido ambiental. El mapa estratégico de ruido de la aglomeración de Terrassa, pone de manifiesto las zonas donde se superan los índices de ruido, en las cuales sería necesario elaborar planes específicos de actuación. En este trabajo se presentan las actuaciones propuestas y realizadas así como, los resultados y el coste/beneficio obtenidos. 2010-12-29T15:56:30Z http://hdl.handle.net/2117/10329 Title: Mapas estratégicos de ruido en Catalunya Authors: Jiménez Diaz, Santiago; Romeu Garbí, Jordi; Pàmies Gómez, Teresa; Majó Torrent, Maite Abstract: La Directiva 2002/49 sobre evaluación y gestión del ruido ambiental demanda en caso de aglomeraciones, una serie de datos que hay que comunicar a la Comisión, entre los que se encuentran: el número de personas cuyas viviendas están expuestas a cada rango de valores Lden y de Lnight en dBA. En este trabajo se presentan los criterios contemplados en la delimitación de las aglomeraciones en el interior del territorio de Catalunya, así como las metodologías utilizadas en la estimación de los niveles sonoros y de la población expuesta a los diferentes indicadores de ruido, así como, los resultados obtenidos. 2010-11-16T18:58:36Z http://hdl.handle.net/2117/10317 Title: CATdBTren project: a complete model for the assessment of vibration impact from new railway infrastructures Authors: Alarcón Rovira, Gabriel; Palacios Higueras, José Ignacio; Romeu Garbí, Jordi; Balastegui Manso, Andreu; Arcos Villamarín, Robert; Sánchez Venegas, Ángel Abstract: The prediction of vibration impact remains as a complex challenge for designers of new railway infrastructures. Due to the large quantity of parameters involved in the generation, transmission and reception of the vibration waves, it would be necessary to develop a complete study for each potential receiver, which would include: source, soil and building characterization, infrastructure vibration behaviour modelling and, finally, countermeasures influence prediction. This process can turn out to be very costly in terms of both time and money. Therefore, it is usually done only for areas very likely to suffer high vibration levels or for high sensitive buildings (hospital, educational). The CATdBTren project, which has been awarded with R&D funding from the Catalonia Government, is aimed to develop a new prediction tool for evaluating the vibration impact from new railway infrastructures as well as to develop new types of fastening systems having high vibration isolation properties. That tool is intended to be user-friendly and to produce results with average accuracy, so it still will be required detailed studies of problematic areas. In this sense, the software will model the contact forces caused by high-speed, conventional and underground rolling stock. Moreover, it will model the infrastructure’s vibration transmission behaviour, ground vibration propagation, terrain-foundation coupling and building vibration mechanism. The CATdBTren prediction tool will be also capable of estimating the influence of the rolling stock, rail and wheel roughness, fastening system, substructure, soil vibration propagation properties and building characteristics, all in the final vibration impact. 2010-11-16T15:31:16Z http://hdl.handle.net/2117/10045 Title: Analysis of fracture resistance of tool steels by means of acoustic emission. Authors: Martínez González, Eva; Picas Anfruns, Ingrid; Casellas Padró, Daniel; Romeu Garbí, Jordi Abstract: The usage of advanced high strength steels (AHSS) in structural automotive components has been broadened in the past few years to satisfy the strict specifications of the automotive industry. Besides showing excellent strength to weight rations, AHSS have several limitations due to the high loads required in cold forming and cutting tools, which decrease considerably the tooling performances. Therefore, these important forces of impact provoke unforeseen breakage of the dies. The aim of this research is to study the micromechanical behaviour and fracture mechanisms (nucleation and crack propagation) during fracture of tool steels using the acoustic emission (EA) technique. To do that, bending testing specimens of different tool steels were monitored in order to establish a relationship between AE signals and their mechanical behavior (carbide breakage, cracks emanating from them and crack propagation through the metallic matrix). 2010-10-28T10:43:27Z http://hdl.handle.net/2117/9526 Title: Análisis, diseño y construcción de un chasis autoportante de material composite Authors: Velázquez Ameijide, Juan; Llumà Fuentes, Jordi; Sánchez, C; Martínez González, Eva; Ruiz, Carlos Abstract: Esta ponencia presenta el análisis estructural de un chasis autoportante para un vehículo monoplaza de bajo consumo, realizada en materiales compuestos. Este estudio comprende el análisis de los modos propios de vibración y su incidencia en la rigidez del chasis y la carrocería del vehículo. Se parte de un modelo existente, se parametriza y simula. La validación de los resultados se realiza mediante los resultados se realiza mediante los datos obtenidos en las pruebas de laboratorio. Los posibles materiales para utilizar en el nuevo chasis propuesto se caracterizan mediante ensayos mecánicos estándar a fin de parametrizarlos para los programas de simulación. El ajuste fino de los valores obtenidos se realiza mediante las pruebas de laboratorio de la carrocería del modelo existente. 2010-10-07T10:46:01Z http://hdl.handle.net/2117/9165 Title: Integral curriculum on noise control in Spain: a cooperative task Authors: Romeu Garbí, Jordi; Genesca Francitorra, Meritxell; Pàmies Gómez, Teresa Abstract: Since the European Directive on Environmental Noise 2002/49 came into effect requiring strategic agglomeration and infrastructure noise maps to be made, the demand on environmental Acoustics knowledge has been boosted in Spain. Currently several groups and companies are available to carry out noise surveys and pointing out the noise causes in different streets or areas of a city. However, a second stage is starting now: once the noise causes are identified, control noise techniques needs to be applied. This fact is supported in the Spanish adaptation of this regulation known as Ley del Ruido (2003) that states that noise control techniques should be applied to minimize the acoustic emission of municipal work activities, municipal devices, infrastructures, road work…This means that a demand on noise control knowledge is arising. This knowledge is scarcely provided in the bachelor degrees currently available in Spain, but there are some master degrees focused in Acoustics. However, it is difficult to find an institution that can cover all the topics needed for a complete Acoustics curriculum. This work analyses the feasibility of creating an integral curriculum in noise control involving different Spanish research groups in order to take benefit of the expertise of each one to cover the legal and industrial needs of Acoustics knowledge. In that way, the teaching effort would be optimized and the appropriate facilities would be available, however funds would be necessary for the mobility of teachers and students. 2010-09-29T14:46:19Z http://hdl.handle.net/2117/9137 Title: A measurement method to discriminate aircraft fly-over noise Authors: Genesca Francitorra, Meritxell; Romeu Garbí, Jordi; Pàmies Gómez, Teresa Abstract: Currently aircraft noise monitoring systems use a mesh of single microphones distributed around an airport to continuously sample the noise level. This fact requires a manual process of aircraft noise event detection and classification in order to distinguish aircraft events from the rest of noise events in the recording. In the present paper a 3-meter-long 12-microphone linear array is used to automatically obtain a background noise free aircraft noise recording. The beamforming process separates the noise impinging in the array from above (potential aircraft noise) and the noise impinging from below (urban noise and reflections), the results are enhanced by the use of a trigger condition on the difference between both. The theoretical results reveals that the background noise in the aircraft noise recording can be attenuated by about 8 dB if the microphone array is optimally placed. The experimental tests shows that even in non optimal placements the array still provides better results than a single microphone if the threshold value in the trigger condition is properly set. 2010-09-28T18:18:58Z http://hdl.handle.net/2117/9135 Title: Caracterización de las vibraciones provocadas por la circulación ferroviaria sobre un viaducto Authors: Cardona, Joan; Arcos Villamarín, Robert; Romeu Garbí, Jordi; Jiménez Diaz, Santiago; Balastegui Manso, Andreu Abstract: La determinación del impacto ambiental es uno de los estudios necesarios para el desarrollo de nuevas infraestructuras del territorio, cuyo objetivo es llevar a cabo una predicción de las afecciones sobre el entorno que provocaran dichas infraestructuras. Uno de los vectores de los estudios de impacto ambiental es la determinación del impacto por vibraciones, especialmente en lo referente a nuevas infraestructuras ferroviarias. Sin embargo, aún no existe un modelo de predicción de vibraciones que permita determinar dicho impacto. En el presente artículo, se va a desarrollar un modelo para la caracterización de un viaducto como infraestructura sobre la cual circulan unidades ferroviarias y, por tanto, encargada de trasmitir vibraciones al entorno. Para ello, se analizará la radiación de dichas vibraciones sobre el terreno adyacente mediante simulación numérica que partirá de la consideración qie cada pilar del viaducto es asimilable a una fuente puntual que radia vibración según la ecuación de onda. Estos resultados teóricos se validaran mediante ensayos experimentales de propagación de vibraciones en el entorno de viaductos. 2010-09-28T17:58:40Z http://hdl.handle.net/2117/9134 Title: Impacto acústico generado por los procesos de recogida selectiva de residuos urbanos Authors: Jiménez Diaz, Santiago; Jiménez Aguilar, Alejandro; Romeu Garbí, Jordi Abstract: La recogida de residuos urbanos es uno de los servicios municipales, junto con la limpieza viaria, que más quejas y molestias por ruido genera. Este aspecto queda claramente reflejado en los estudios de percepción social del ruido. Desde hace unos años la recogida de residuos se realiza de forma selectiva, dependiendo de la fracción de que se trate (envases, materia orgánica, papel-cartón, vidrio y resto), lo que conlleva a diferentes métodos y procesos de recogida, implicando una mayor frecuencia de vehículos y operaciones de recogida por toda la ciudad. Al proceder de esta forma, se origina un aumento de ruido y un posible incremento de las molestias de los ciudadanos. En este trabajo se presentan y analizan los resultados obtenidos de los diferentes procesos de recogida selectiva que se realizan en el municipio de Terrassa. 2010-09-28T17:28:37Z http://hdl.handle.net/2117/8955 Title: A ground-borne vibration assessment model for rail systems at-grade Authors: Cardona, J.; Romeu Garbí, Jordi; Arcos Villamarín, Robert; Balastegui Manso, Andreu Abstract: Due to the increasing number and kilometres of new railways lines, either high speed railway lines or commuter lines, as well as the increasing in human sensitivity versus ground-borne vibration generated for this mean of transport, a sustained growth in complaints due to the annoyance caused by railway vibrations has been detected. In order to predict the field vibrations caused by new railway lines in the project stage, which will be useful to design appropriate countermeasures, in the present work a ground-borne vibration model for rail systems at-grade developed by the authors is validated with experimental measurements in an existing commuter railway line. It checked that this model is a very useful tool to predict the vibration field that will be caused by a railway infrastructure in the planning stage of the project. 2010-09-17T15:21:05Z http://hdl.handle.net/2117/8954 Title: Strategic vibration mapping for railway infrastructures Authors: Alarcón Rovira, Gabriel; Palacios Higueras, José Ignacio; Solé, Jaume Abstract: The Environmental Noise Directive 2002/49/EC requires the Member States to determine the exposure to environmental noise through noise mapping for agglomerations, roads, railways and airports using common methods of assessment. These maps will be made available to the public and will allow adopting action plans to prevent and reduce environmental noise, particularly where exposure levels can induce harmful effects. The END does not establish how to asses or reduce vibration impact caused by railway infrastructures. Within this directive, no common method of assessment or evaluation of people exposure to railway induced vibrations are defined. In this paper, Strategic Vibration Mapping concept for railway infrastructures is developed including discussion about input data, vibration harshness evaluation, quantification and action planning. 2010-09-17T14:48:50Z