A dynamical model of a double-deck circular tunnel embedded in a full-space 

    Clot Razquin, Arnau (Date of defense: 2014-02-20)

    This thesis presents a three-dimensional dynamic model of a double-deck circular tunnel embedded in a full-space. The model uses the receptance method to obtain the response of the complete structure from the response of ...

    A high-performance electromagnetic vibration energy harvester based on ring magnets with Halbach configuration: design, optimization, and applications 

    Ordóñez Izquierdo, Víctor Hugo (Date of defense: 2022-09-22)

    Electromagnetic vibration energy harvesting is a relatively modern technology that has received relevant attention in the last decade from the research community and industry as a potential complement or alternative to the ...

    A model for railway induced ground vibrations in the frame of preliminary assessment studies 

    Arcos Villamarín, Robert (Date of defense: 2007-07-13)

    This thesis focuses on the development of an analytical model for the generation and propagation parts of a global model of ground induced vibrations to be used in preliminary assessment studies for the case of at-grade ...

    A new computational approach to topology optimization in solid mechanics problems 

    Yago Llamas, Daniel (Date of defense: 2022-01-24)

    This doctoral thesis addresses topology optimization problems at a single scale. Based on this purpose, a new topology optimization approach is developed in order to improve existing and widespread techniques in the research ...

    Active control of noise transmitted from barriers 

    Sohrabi, Shahin (Date of defense: 2022-03-11)

    Active noise cancellation is a unique approach that helps passive noise control in reducing sound levels at low frequencies; nevertheless, successful use of active noise cancellation necessitates performing numerous and ...

    Advanced 2.5D meshless methodologies to deal with soil-structure interaction problems in elastodynamics 

    Liravi, Hassan (Date of defense: 2022-07-29)

    This thesis is concerned with the development of efficient and practical numerical methodologies to deal with longitudinally invariant soil-structure interaction problems in elastodynamics. All the approaches appearing in ...

    Amortiguación de final de carrera de actuadores hidráulicos 

    Algar Espejo, Antonio (Date of defense: 2021-02-08)

    The internal cushioning systems of hydraulic linear actuators, of special interest in mobile machinery, pursue to avoid mechanical shocks at their end of stroke. The design where the piston, with perimeter grooves, regulates ...

    An efficient methodology based on two-and-a-half-dimensional finite element and boundary element methods for ground-borne vibration radiated by underground railway tunnels and the re-radiated noise emitted inside them 

    Ghangale, Dhananjay (Date of defense: 2019-07-19)

    This thesis presents a methodology for assessing induced ground-borne vibration due to Underground railway infrastructures in the context of an urban environment. The methodology is based on a comprehensive numerical ...

    Analysis and design of a capillary driven blood plasma separation microfluidic device 

    Madadi, Hojjat (Date of defense: 2014-01-17)

    Recently, the emergence of lab-on-a-chip devices has seen in a variety of applications especially in clinical analys is and diagnostics. ln particular the lack of suitable microdevices for separation of plasma from whole ...

    Análisis de la respuesta dinámica en agitadores industriales 

    Bossio, Matias Alberto (Date of defense: 2021-06-01)

    In food and pharmacological industries, reducing the production time and improving the machine flexibility to be adapted to new products is a constant necessity. This generate changes on the initial working conditions for ...

    Análisis y diseño de volantes de inercia de materiales compuestos 

    Ripoll Masferrer, Lluís (Date of defense: 2006-01-11)

    Los volantes de inercia superan a las baterías eléctricas por su capacidad de absorber y ceder energía en poco tiempo y, si se fabrican con materiales compuestos, también por su reducido peso. La tesis presenta un estudio ...

    Aportació a l'estudi de la reducció de vibracions residuals en transitoris de moviment generats mitjançant accionaments de cinemàtica no lineal 

    Lores Garcia, Eduard (Date of defense: 2017-12-22)

    Machines and mechanisms can usually exhibit a vibratory behavior during operation since they are formed by deformable solids of non-negligible mass and non-rigid joints. This oscillatory behavior can be shown for transient ...

    Aportación al estudio de levas desmodrómicas 

    Zayas Figueras, Enrique Ernesto (Date of defense: 2001-11-26)

    Los mecanismos leva-palpador en los que el cierre del par superior se realiza por la configuración geométrica de la leva y del palpador son denominados desmodrómicos o levas con cierre geométrico. Estos mecanismos son poco ...

    Aporte al diseño de engranajes no circulares cilíndricos rectos 

    Quintero Riaza, Héctor Fabio (Date of defense: 2006-06-28)

    En multitud de aplicaciones, es de interés obtener relaciones de transmisión variables a lo largo de un ciclo de rotación del eslabón conductor. Éstas pueden obtenerse mediante distintos mecanismos, entre ellos los engranajes ...

    Application of dynamic vibration absorbers on double-deck circular railway tunnels to mitigate railway-induced ground-borne vibration 

    Noori, Behshad (Date of defense: 2019-07-19)

    This dissertation is concerned with investigating the efficiency of dynamic vibration absorbers (DVAs) as measures to mitigate ground-borne vibrations induced by railway traffic in double-deck tunnels. The main topics of ...

    Biomechanical study of intervertebral disc degeneration 

    González Guitiérrez, Ramiro Arturo (Date of defense: 2012-01-09)

    Degeneration and age affect the biomechanics of the intervertebral disc, by reducing its stiffness, flexibility and shock absorption capacities against daily movement and spinal load. The biomechanical characterization of ...

    Caracterización y representación de los requerimientos funcionales y las tolerancias en el diseño conceptual: aportaciones para su implantación en los sistemas CAD 

    Pérez Rodríguez, Roberto (Date of defense: 2002-03-18)

    El aumento de la competencia en el área de la fabricación moderna ha propiciado una mayor preocupación por la reducción de los costes, por el aumento de la calidad del producto y por la reducción progresiva del tiempo entre ...

    Comportamiento mecánico de las juntas tipo T-bolt en materiales compuestos gruesos 

    Martínez Moll, Víctor (Date of defense: 2003-06-27)

    En aquest treball s'ha realitzat una anàlisi de la junta T-bolt aplicada a la unió de laminats gruixuts amb elements metàl·lics. Més concretament, l'estudi es centra en el tipus de juntes T-bolt emprades en la unió entre ...

    Computational aeroacoustics in the automotive industry 

    Martín Navarrete, Rocío (Date of defense: 2021-02-02)

    The acoustic field inside a car cabin for low driving speeds is dominated by the engine or the tire noise. However, for mid to high velocities, the noise generated by the interaction of the car with the external air becomes ...

    Contribució a l'estudi de l'acústica dels tubs axisimètrics 

    Jordi, Lluïsa (Date of defense: 1999-10-14)

    La tesi "Contribució a l'estudi de l'acústica dels tubs axisimètrics" és un treball centrat en l'estudi del comportament acústic dels tubs dels instruments musicals de vent amb simetria de revolució en el qual es fa ...