Universitat Politècnica de Catalunya
Mostrando ítems 1-20 de 98
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 ...
La principal causa de las vibraciones generadas por la circulación de un tren reside en el contacto rueda-carril, concretamente en las fluctuaciones de la fuerza de contacto provocadas por las irregularidades del perfil ...
Mejorar el acabado superficial de una pieza plana o cilíndrica, se puede hacer de manera relativamente sencilla, utilizando para ello un proceso de rectificado. Sin embargo lograr un buen acabado superficial en una superficie ...
La dependència actual dels combustibles fòssils en la majoria de sectors industrials i domèstics no és sostenible ni a curt ni a llarg termini. Això està obligant a plantejar alternatives a la majoria de sectors industrials ...
La introducció de la colza en la rotació de conreus i la producció i ús d’oli vegetal cru (OVC) com a biocarburant per autoconsum agrícola presenten alguns avantatges respecte al sistema tradicional de conreu de la ...
One of the challenges of the wind energy community today is to improve the existing background on the aerodynamic phenomena of a Horizontal Axis Wind Turbine (HAWT), the prediction of the wind speed distribution on the ...
The present thesis investigates a passive acoustic method to locate maneuvering aircraft. The method is based on the acoustical Doppler effect, as a particular effect of the signals received by a mesh of spatially distributed ...
La motivació d'aquesta tesi és entendre com pot ser gestionada la integració de coneixement en projectes de subcontractació estratègica de disseny de producte. Una participació activa de l'empresa durant la realització de ...
The main objective of this PhD thesis is the fluid dynamic characterization of the flow behind vortex generators (VG) as well as to investigate their influence in the separation of the boundary layer. CFD simulations have ...
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 ...
This thesis is focused on the calibration of the Acoustic Emission (AE) technique to detect and identify damage mechanisms in tool steels. The AE measurement procedure has been calibrated for two mechanical tests: fracture ...
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 ...
Turbulence onset within an initially laminar flow is one of the most common phenomenon in Fluid Mechanics, yet is an open field of research. This is due to the many and diverse causes that can trigger turbulence, which ...
This thesis presents the dynamic study of conjugate cam mechanisms with rollers follower and translational movement, to design them with the aim of retard the surface fatigue failure in the rollers. The premature failure ...
Cured epoxy resins are highly cross-linked polymers which are increasingly important in high performance engineering field due to the stiffness, high strength, heat resistance and solvent resistance. However one major ...
The present work composes a contribution towards the Construction of World models for its implementation in 'Agile Manufacturing Architectures', aiming to take a step further the control programs for manufacturing systems, ...
Positive displacements pumps, as currently designed, produce significant flow pulsations that result in pressure pulsations. These pulsations contribute to the global noise generated by the installation. Moreover, they ...
The analysis of the dynamic behaviour of rotating turbomachinery components is of relevant interest to avoid damages or fatigue problems in these parts. To determine the dynamic behaviour of a part of a structure it is ...
Lab-on-a-Chip (LOC) integrated microfluidics has been a powerful tool for new developments in analytical chemistry. These microfluidic systems enable the miniaturization, integration and automation of complex biochemical ...
The aim of this thesis is studying and characterizing a ball burnishing process assisted with vibrations. By introducing vibrations in the overall process, results are enhanced if compared to the ones derived from a ...
