Exploració per autor "Egusquiza Estévez, Eduard"
Ara es mostren els items 54-73 de 96
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Improved damage detection in Pelton turbines using optimized condition indicators and data-driven techniques
Zhao, Weiqiang; Egusquiza Montagut, Mònica; Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard (2021-01-07)
Article
Accés obertThe health condition of hydraulic turbines is one of the most critical factors for the operation safety and financial benefits of a hydro power plant. After the massive entrance of intermittent renewable energies, hydropower ... -
Increasing the operating range and energy production in Francis turbines by an early detection of the overload instability
Zhao, Weiqiang; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2021-08)
Article
Accés obertWith the increasing entrance of wind and solar power for the generation of electricity, more flexibility is demanded to hydropower plants. More flexibility means that hydro turbines have to increase the operating range ... -
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 obertDetermining 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 obertThe 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 obertNatural 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 ... -
Influence of the hydrodynamic damping on the dynamic response of Francis turbine runners
Valentín Ruiz, David; Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Jou Santacreu, Esteban; Egusquiza Estévez, Eduard (2019-10-01)
Article
Accés obertThe dynamic behavior of Francis runners is of interest in the hydraulic machinery field since it is one of the most used type of hydraulic turbines for electricity generation. To evaluate the dynamic behavior of Francis ... -
Modal behavior of a reduced scale pump-turbine impeller. Part I. Experiments
Escaler Puigoriol, Francesc Xavier; Hutter, J.K.; Egusquiza Estévez, Eduard; Farhat, Mohamed; Avellan, F. (2010)
Comunicació de congrés
Accés restringit per política de l'editorialAn experimental investigation has been carried out to quantify the effects of surrounding fluid on the modal behavior of a reduced scale pump-turbine impeller. The modal properties of the fluid-structure system have been ... -
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'editorialA 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 ... -
Monitoring of rotor-stator interaction in pump-turbine using vibrations mesured with on-board sensors rotating with shaft
Rodriguez Godoy, Cristian; Mateos Prieto, Borja; Egusquiza Estévez, Eduard (2014-02)
Article
Accés restringit per política de l'editorialCurrent trends in design of pump-turbines have led into higher rotor-stator interaction (RSI) loads over impeller-runner. These dynamic loads are of special interest having produced catastrophic failures in pump-turbines. ... -
Multi-objective optimization of a hydro-wind-photovoltaic power complementary plant with a vibration avoidance strategy
Xiong, Hualin; Egusquiza Montagut, Mònica; Østergaard, Poul Alberg; Pérez Díaz, Juan Ignacio; Sun, Guoxiu; Egusquiza Estévez, Eduard; Patelli, Edoardo; Xu, Beibei; Duan, Hongjiang; Chen, Diyi; Luo, Xingqi (2021-11-01)
Article
Accés obertHydropower has the advantages of quickly responding to load variability, which overcomes the unpredictable and unstable variabilities of solar and wind power. Therefore, such power generation can be combined into a ... -
Natural frequencies of rotating disk-like structures submerged viewed from the stationary frame
Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2021)
Text en actes de congrés
Accés obertTo understand the effect of rotation in the dynamic response of pump-turbine runners, simplified models such as disk-like structures can be used. In previous researches the natural frequencies and mode shapes of rotating ... -
Nonlinear modal interaction analysis and vibration characteristics of a francis hydro-turbine generator unit
Xu, Beibei; Luo, Xingqi; Egusquiza Montagut, Mònica; Ye, Wei; Liu, Jing; Egusquiza Estévez, Eduard; Chen, Diyi; Guo, Pengcheng (Elsevier, 2021-05-01)
Article
Accés obertThe Francis hydro-turbine generator unit (FHTGU) is a typical nonlinear system with the coupling hydraulic, mechanical and electric subsystems. It is a challenge to understand the reasons for its operational failures because ... -
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'editorialThis 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 ... -
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)
Article
Accés restringit per política de l'editorialThis 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 ... -
Numerical study of the fluid – structure interaction in the diffuser passage of a centrifugal pump
Fontanals García, Alfred; Guardo Zabaleta, Alfredo de Jesús; Coussirat, Miguel; Egusquiza Estévez, Eduard (CIMNE, 2011)
Text en actes de congrés
Accés obertReliable design of turbomachinery is a complex task. In order to gain overall efficiency in the machine performance, designers may have to reduce the gap between the impeller and the diffuser, forcing them to be as closely ... -
Numerical study of the fluid-structure interaction in the diffuser passage of a centrifugal pump
Fontanals García, Alfred; Guardo Zabaleta, Alfredo de Jesús; Coussirat Núñez, Miguel Gustavo; Egusquiza Estévez, Eduard (Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE), 2011)
Text en actes de congrés
Accés obertReliable design of turbomachinery is a complex task. In order to gain overall efficiency in the machine performance, designers may have to reduce the gap between the impeller and the diffuser, forcing them to be as closely ... -
Numerical study on the influence of acoustic natural frequencies on the dynamic behaviour of submerged and confined disk-like structures
Bossio, Matias; Valentín Ruiz, David; Presas Batlló, Alexandre; Ramos Martín, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica (2017-08)
Article
Accés obertThe dynamic response of disks has been deeply studied in the last years given that their dynamic characteristics present similarities with more complex disk-like structures used in real engineering applications, such as ... -
On the capability of structural–acoustical fluid–structure interaction simulations to predict natural frequencies of rotating disklike structures submerged in a heavy fluid
Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2016-04-13)
Article
Accés restringit per política de l'editorialPredicting natural frequencies of rotating disklike structures submerged in water is of paramount importance in the field of hydraulic machinery, since the dynamic response of disks presents similarities to the dynamic ... -
On the detection of natural frequencies and mode shapes of submerged rotating disk-like structures from the casing
Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2015-08)
Article
Accés obertTo avoid resonance problems in rotating turbomachinery components such as impellers, it is of paramount importance to determine the natural frequencies of these parts when they are under operation. Nevertheless, most of ... -
On the exctitation of a submerged disk-like structure with RSI patterns
Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2015)
Text en actes de congrés
Accés restringit per acord de confidencialitatDetermining 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 ...