Ara es mostren els items 1-20 de 23

  • Accurate determination of the frequency response function of submerged and confined structures by using PZT-patches 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Bossio, Matias (2017-03-22)
    Article
    Accés obert
    To accurately determine the dynamic response of a structure is of relevant interest in many engineering applications. Particularly, it is of paramount importance to determine the Frequency Response Function (FRF) for ...
  • Analysis if the dynamic response of pump-turbine runners- Part I: Experiment 

    Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard; Huang, Xingxing; Farhat, Mohamed; Avellan, François (2012)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this ...
  • Analysis of the dynamic response of pump-turbine impellers. Influence of the rotor 

    Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Huang, Xingxing; Guardo Zabaleta, Alfredo de Jesús; Seidel, Ulrich (2016-02-01)
    Article
    Accés restringit per política de l'editorial
    This paper deals with the dynamic response of pump-turbine impellers. A pump-turbine impeller is a complex structure attached to a rotor and rotating inside a casing full of water with very small clearances between the ...
  • Analysis of the dynamic response of pump-turbine runners. Part I: Experiment 

    Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Huang, Xingxing; Egusquiza Estévez, Eduard; Farhat, Mohamed; Avellan, François (IOPScience, 2012)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this ...
  • Assessment of the economic and environmental impact of double glazed façade ventilation systems in Mediterranean climates 

    Valentín Ruiz, David; Guardo Zabaleta, Alfredo de Jesús; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Alavedra, Pere (2013-09-30)
    Article
    Accés obert
    Free convection is the most often used method in order to reduce solar load gains on a building with double glazed façades (DGFs). However, depending on the climate factors, the thermal performance of a DGF may not be ...
  • Computational fluid dynamics modeling of impinging gas-jet systems: II. Application to an industrial cooling system device 

    Coussirat Núñez, Miguel Gustavo; van Beeck, J; Mestres Ridge, Marc; Egusquiza Estévez, Eduard; Buchlin, J-M; Valero Ferrando, Ma. del Carmen (2005-07-15)
    Article
    Accés restringit per política de l'editorial
    A numerical analysis of the flow behavior in industrial cooling systems based on arrays of impinging jets has been performed, using several eddy viscosity models to determine their modeling capabilities. For the cooling ...
  • Condition monitoring of pump-turbines 

    Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (2014)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    At present, new renewables like wind, solar and marine energy are having a strong development. The generation of energy by renewables has the disadvantage that it depends on atmospheric conditions. It means that they ...
  • Condition monitoring of pump-turbines. New challenges 

    Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Valentín Ruiz, David; Presas Batlló, Alexandre; Rodriguez Godoy, Cristian (2015-05)
    Article
    Accés obert
    At present, pumped storage is the only system to store huge amounts of energy. The surplus of energy in the electrical grid is used for pumping water from a lower to a higher reservoir (pump operation). At peak hours or ...
  • Dynamic response of a rotating disk submerged and confined. Influence of the axial gap 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2016-04-01)
    Article
    Accés restringit per política de l'editorial
    In this paper, the natural frequencies and mode shapes of a rotating disk submerged and totally confined inside a rigid casing, have been obtained. These have been calculated analytically, numerically and experimentally ...
  • El Diagnóstico de daños en grupos hidroeléctricos mediante el análisis de vibraciones 

    Egusquiza Estévez, Eduard; Nascimento, Luiz de Paula do; Valero Ferrando, Ma. del Carmen; Jou Santacreu, Esteban (1994)
    Article
    Accés obert
    El análisis del comportamiento vibratorio de Grupos Hidroeléctricos se puede utilizar para el diagnóstico del estado de la máquina. Se pretende detectar daños incipientes y poder seguir la evolución del estado de la máquina ...
  • Experimental analysis of the dynamic behavior of a rotating disk submerged in water 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2014)
    Text en actes de congrés
    Accés obert
    To study the dynamic behavior of turbine runners (natural frequencies and mode shapes) not only the added mass effect of still water has to be considered. Also the effect of rotation may not be neglected in the dynamic ...
  • Experimental study of a vibrating disk submerged in a fluid-filled tank and confined with a nonrigid cover 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica (2017-04-01)
    Article
    Accés restringit per política de l'editorial
    Determining the dynamic response of submerged and confined disklike structures is of interest in engineering applications, such as in hydraulic turbine runners. This dynamic response is heavily affected by the added mass ...
  • Experimental study on the added mass and damping of a disk submerged in a partially fluid-filled tank with small radial confinement 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2014-07-16)
    Article
    Accés restringit per política de l'editorial
    The dynamic response of submerged and confined disk-like structures is of interest in engineering applications, such as in hydraulic turbine runners. This response is difficult to be estimated with accuracy due to the ...
  • Failure investigation of a large pump-turbine runner 

    Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Huang, Xingxing; Guardo Zabaleta, Alfredo de Jesús; Jou Santacreu, Esteban; Rodríguez, Cristian (Elsevier, 2012-02-02)
    Article
    Accés obert
  • Feasibility of Using PZT Actuators to Study the Dynamic Behavior of a Rotating Disk due to Rotor-Stator Interaction 

    Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Valentín Ruiz, David; Seidel, Ulrich (2014-07-01)
    Article
    Accés restringit per política de l'editorial
    In this paper, PZT actuators are used to study the dynamic behavior of a rotating disk structure due to rotor-stator interaction excitation. The disk is studied with two different surrounding fluids-air and water. The study ...
  • Influence of non-rigid surfaces on the dynamic response of a submerged and confined disk 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2015)
    Text en actes de congrés
    Accés obert
    Determining the dynamic response of submerged and confined disk-like structures is of interest in the hydraulic turbines field. Disks present similar dynamic characteristics than hydraulic turbine runners, especially in ...
  • Influence of the added mass effect and boundary conditions on the dynamic response of submerged and confined structures 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2014)
    Text en actes de congrés
    Accés obert
    The dynamic response of submerged and confined disk-like structures is of interest in the flied of hydraulic machinery, especially in hydraulic turbine runners. This response is difficult to be estimated with accuracy due ...
  • Influence of the boundary conditions on the natural frequencies of a Francis turbine 

    Valentín Ruiz, David; Ramos Martín, David; Bossio, Matias; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (Institute of Physics (IOP), 2016)
    Text en actes de congrés
    Accés obert
    Natural frequencies estimation of Francis turbines is of paramount importance in the stage of design in order to avoid vibration and resonance problems especially during transient events. Francis turbine runners are submerged ...
  • Modal behavior of a reduced scale pump-turbine impeller. Part II. Numerical Simulation 

    Valero Ferrando, Ma. del Carmen; Huang, Xingxing; Egusquiza Estévez, Eduard; Farhat, Mohamed; Avellan, François (2010)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    A numerical simulation has been carried out to analyze the modal behavior of a reduced scale pump-turbine impeller. The simulation has been done using FEM method, in air and in water. The same boundary conditions than ...
  • Numerical and experimental analysis of the dynamic response of large submerged trash-racks 

    Huang, Xingxing; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard; Presas Batlló, Alexandre; Guardo Zabaleta, Alfredo de Jesús (2013-01-30)
    Article
    Accés restringit per política de l'editorial
    This paper investigates the effect of water in the dynamic response of large trash-racks used in hydropower plants. These are large structures that are fully submerged in water and located in the hydraulic circuits to ...