Universitat Politècnica de Catalunya
Now showing items 3-22 of 34
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 ...
Hydraulic machines are faced with increasingly severe performance requirements. The need to design smaller and more powerful machines rotating at higher speeds in order to provide increasing efficiencies, has to face a ...
El desarrollo de esta tesis se centra en el estudio del sincronizado de actuadores lineales oleohidráulicos mediante válvulas divisoras de caudal.<br/>La mayoría de los estudios dedicados al análisis del comportamiento ...
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 ...
Esta tesis está relacionada con un proyecto macro cuyo título es "New design and manufacturing processes for high pressure fluid power products" -2004-2008 (acrónimo: PROHIPP), el cual es cofinanciado por la Unión Europea ...
A les turbomàquines pot haver una forta interacció entre els àleps del rodet i les directrius del difusor que afecten la dinàmica del flux i el rendiment estructural de les màquines. Aquest fenomen s’anomena interacció ...
En los últimos años, los trabajos de investigación están muy motivados por todo aquello que contribuye a reducir el ruido emitido por los sistemas oleohidráulicos. Como ha sido demostrado por varios investigadores, el ...
En el ámbito de la Oleohidráulica, las bombas de pistón poseen los diseños más sofisticados, de hecho, las bombas de pistones son las únicos capaces de trabajar a altas presiones, además de poseer el mejor rendimiento de ...
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 aim of this Ph.D. thesis, "Effects of flow control on flow past bluff bodies" is to study and analyzes the effects of Flow Control on various aspects and proverbs of flow past bluff bodies. Flow control techniques are ...
The energy efficiency assessment of high-pressure pneumatic circuits is the aim of this dissertation. From a historical perspective the past and cur- rent activities with regards to the energy saving conservation in pneumatic ...
El conocimiento del comportamiento de los sistemas con elementos flexibles es cada vez mas importante en la técnica moderna. La notable mejora de las prestaciones dinámicas que comporta la reducción de la masa de los ...
La Tesis en cuestión presenta un estudio sobre el comportamiento de la rigidez de una suspensión neumática, así como de los parámetros que la definen y/o afectan.<br/>El trabajo realizado propone un modelo capaz de predecir ...
The present thesis is undertaken to study the use of an aqueous solution of LiCl as a secondary refrigerant, due to its dehydrating properties, in those refrigeration applications that require mainly the air dehumidification ...
La experimentación y posterior modelización de los procesos de transporte y transferencia de calor y de masa en medios poroso saturados encuentra un gran número de dificultades que se derivan fundamentalmente 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 ...
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 ...
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 ...
The dynamic response of any structure submerged in water is significantly modified by the effect of added mass. The inertia of the fluid that the body must accelerate during its vibrational motion decreases its natural ...
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 ...
