Browsing by Author "Moraga González, Greco Alonso"Més informació

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    • Analysis of the mode shapes of Kaplan runners 

      Moraga González, Greco Alonso; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre (Multidisciplinary Digital Publishing Institute, 2022-07-02)
      Article
      Open Access
      To prevent lifetime shortening and premature failure in turbine runners, it is of paramount importance to analyse and understand its dynamic response and determine the factors that affect it. In this paper, the dynamic ...

    • Characterization of the fluid damping in simplified models of pump-turbines and high head Francis runners 

      Moraga González, Greco Alonso; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Zhou, Lingjiu; Presas Renom, Andreu (IOP Publishing, 2022)
      Conference report
      Open Access
      In order to satisfy the power demand in the electrical grid, hydraulic turbine units frequently work under off-design operation conditions and pass through transient events. These operation conditions can lead to high ...

    • Determination of the natural frequencies of a prototype Kaplan turbine 

      Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Presas Batlló, Alexandre; Moraga González, Greco Alonso (Institute of Physics (IOP), 2022-09-01)
      Article
      Open Access
      The natural frequencies of a turbine can be calculated from numerical methods. By comparing these natural frequencies with excitation sources, one can know the danger of a resonance and a possible failure in a component ...

    • Excessive vibrations experienced in a Kaplan turbine at speed no load 

      Moraga González, Greco Alonso; Mut Monfort, Vicent; Girardelo, Jeferson; Mazzouji, Farid; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Presas Batlló, Alexandre (Elsevier, 2024-03)
      Article
      Open Access
      A Kaplan turbine unit from a new powerplant experienced high levels of vibrations and noise during the acceleration of the unit to nominal speed. These levels remained very high at speed no load. A first analysis seemed ...

    • Experimental study on the influence of vibration amplitude on the fluid damping of a submerged disk 

      Moraga González, Greco Alonso; Xia, Xiang; Roig López, Sergi; Valero Ferrando, Ma. del Carmen; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Zhou, Lingjiu; Egusquiza Estévez, Eduard; Presas Batlló, Alexandre (Elsevier, 2023-10)
      Article
      Open Access
      Accurate determination of modal parameters for disk-like structures submerged in heavy fluids is a topic of interest in many fields. For instance, some type of hydraulic turbomachinery can be modelled as disk structures ...