Programa de Doctorat en Enginyeria Mecànica, Fluids i Aeronàutica: Recent submissions
Now showing items 61-80 of 106
Study and characterisation of surface integrity modification after ultrasonic vibration-assisted ball burnishing
This dissertation is an experimental research project into the mechanical effects of the ultrasonic vibration-assisted ball burnishing process on the surface integrity of surfaces machined through ball-end milling. Due to ...
Análisis del comportamiento frente acciones cíclicas de muros de mampostería reforzados con materiales compuestos de matriz inorgánica y tejidos de fibras vegetales
In order to pursue sustainable objectives in the construction industry, a new composite material using vegetal fabric coated with resin and embedded into mortar was developed, characterized and applied on masonry walls. ...
Estudio de la energía específica consumida en el rectificado
To contribute in the increase of the productivity and to the energetic saving in companies, the present thesis focuses the investigation on the process of grinding. The energetic efficiency grinding one depends on the ...
Contribució a l'estudi de la impressió 3D per a la fabricació de models per facilitar l'assaig d'operacions quirúrgiques de tumors
La present tesi doctoral s’ha centrat en el repte d’aconseguir, mitjançant Fabricació Additiva (FA), models per a assaig quirúrgic, sota la premissa que els equips per fer-los haurien de ser accessibles a l’àmbit hospitalari. ...
On the changes in dynamic behavior produced by the hydraulic turbine runner damage
Hydropower plays a very important role in the world electricity generation nowadays. Hydropower is one type of renewable energy and is the only renewable energy source that can provide a wide range of power regulation with ...
Application of dynamic vibration absorbers on double-deck circular railway tunnels to mitigate railway-induced ground-borne vibration
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 ...
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
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 ...
Flow and heat transfer of impinging synthetic jets
Synthetic jets are produced by the oscillatory movement of a membrane inside a cavity, causing fluid to enter and leave through a small orifice. This results in a net jet that is able to transfer kinetic energy and momentum ...
Contribució a la detecció de defectes singulars en els perfils de les rodes de ferrocarril mitjançant l’anàlisi de les vibracions generades en el contacte roda-carril
One of the main problems presented due to the defects in the profiles of the railway wheels is the generation of vibrations and noise, and their propagation towards the environment. Defects in wheels, such as surface pitting ...
Contribución a las tecnologías de fabricación aditiva para la obtención de piezas multimaterial, combinando la impresión 3D por máscara con la impresión funcional mediante sistemas InkJet
In recent decades, there has been a digitalization in all areas and faetones have not been been exempt from of this phenomenon, incorporating CAD I CAM I CAE systems, as well as automatas, robots, and real-time control ...
Contribución al desarrollo de una metodología de diseño para la fabricación con tecnologías aditivas de piezas con alta variabilidad de demanda
This thesis is the result of collaboration between the university (UPC) and the company (Fluidra SA) within the framework of the program of industrial doctorates of the agency AGAUR (Agencia de Gestión de Ayudas Universitarias ...
Contribución al estudio de la rugosidad superficial obtenida mediante el proceso de fresado en alta velocidad, en la fase de acabado, de aceros templados de moldes y matrices
The production of components of the moulds and dies sector is increasingly demanding. On the one hand, a better manufacturing quality is required, that requires, among other aspects, the improvement of the surface finish, ...
Numerical and experimental investigation of spectral domain vibration based indicators for structural health monitoring
Structural health monitoring has been defined as the acquisition, validation and analysis of technical data to facilitate life- cycle management decisions. It is the result of a convergent path from many previous existing ...
Assessment of gas-surface interaction modelling for lifting body re-entry flight design
Space re-entry is a challenging endeavor due to the harsh thermo-chemical environment around the vehicle. Heat flux being the reference parameter for Thermal Protection System (TPS) design, the total energy transfer can ...
Aportació a l'estudi de la reducció de vibracions residuals en transitoris de moviment generats mitjançant accionaments de cinemàtica no lineal
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 ...
Influence of the boundary conditions on the dynamic behavior of large hydraulic machines
Nowadays, hydropower plays an essential role in the energy market. With the massive entrance of new renewable sources such as wind or solar power, hydropower is the only renewable generating source that can provide fast ...
Electroplastic cutting influence in machining processes
The thesis presented is performed with the aim of studying the effect of electropulses (EPs) in machining processes such as drilling and round turning processes for different materials. When the EPs of short duration are ...
Development of the in situ forming of a liquid infused preform (ISFLIP) process : a new manufacturing technique for high performance fibre reinforced polymer (FRP) components
A problem is not a problem anymore if no solution exists; therefore, in the present dissertation, a novel manufacturing technique, the In Situ Forming of a Liquid Infused Preform (ISFLIP), is proposed as a solution to some ...
Finite element simulation of the healthy and degenerated lumbar spine : interplay between muscle activity and intervertebral disc multiphysics
The human spine provides mechanical support to the trunk while it protects the spinal cord and nerves from the external loads transferred during daily activities. Such loads are largely controlled by the spine muscles and ...
A novel optimization methodology of modular wiring harnesses in modern vehicles : weight reduction and safe operation
The weight of electric and electronic components of cars has been uninterruptedly increasing through the last decades, and thus the weight of their wiring harnesses. This fact has awakened the interest of car manufacturers ...
