Now showing items 1-20 of 50

    • A novel condition monitoring methodology based on neural network of pump-turbines with extended operating range 

      Zhao, Weiqiang; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Presas Batlló, Alexandre (2019)
      Conference report
      Open Access
      Due to the entrance of new renewable energies, water-storage energy has to be regulated more frequently to keep the stability of power grid. Consequently, pump-turbines have to work under offdesign conditions more than ...
    • A review of dynamic models and stability analysis for a hydro-turbine governing system 

      Xu, Beibei; Zhang, Zhongzhi; Egusquiza Montagut, Mònica; Chen, Diyi; Li, F.; Behrens, Paul; Egusquiza Estévez, Eduard (2021-07)
      Article
      Restricted access - publisher's policy
      Hydropower offers highly flexible, low-carbon generation that can be used to balance electricity grids with high levels of wind and solar penetration. This will become increasingly important as the energy transition unfolds. ...
    • A review of pzt patches applications in submerged systems 

      Presas, Alexandre; Luo, Yongyao; Wang, Zhengwei; Valentín Ruiz, David; Egusquiza Montagut, Mònica (Multidisciplinary Digital Publishing Institute (MDPI), 2018-07-12)
      Article
      Open Access
      Submerged systems are found in many engineering, biological, and medicinal applications. For such systems, due to the particular environmental conditions and working medium, the research on the mechanical and structural ...
    • 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
      Open Access
      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 ...
    • Advanced condition monitoring of Pelton turbines 

      Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Valentín Ruiz, David; Bossio, Matias; Egusquiza Estévez, Eduard (2017)
      Conference report
      Restricted access - publisher's policy
      The ability of hydropower to adapt the electricity generation to the demand is necessary to integrate wind and solar energy to the grid. Nowadays hydropower turbines are required to work under harsher operating conditions ...
    • Advanced condition monitoring of Pelton turbines 

      Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Valentín Ruiz, David; Bossio, Matias (2018-04)
      Article
      Open Access
      The ability of hydropower to adapt the electricity generation to the demand is necessary to integrate wind and solar energy into the electrical grid. Nowadays, hydropower turbines are required to work under harsher operating ...
    • 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 ...
    • Assessment of the use of Venetian blinds as solar thermal collectors in double skin facades in Mediterranean climates 

      Velasco Vilanova, Abel; Jiménez García, Sergi; Guardo Zabaleta, Alfredo de Jesús; Fontanals García, Alfred; Egusquiza Montagut, Mònica (2017-11-10)
      Article
      Open Access
      The global trend on energy integration and building efficiency is making both researchers and building developers look for technical solutions to use facade surfaces for energy harvesting. In this work, the assessment ...
    • Behavior of Francis turbines at part load. Field assessment in prototype: Effects on power swing. 

      Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (Institute of Physics (IOP), 2019)
      Conference report
      Open Access
      Francis turbines are increasingly demanded to work at part load in order to satisfy the electricity generation demand and to compensate the non-constant generation of other renewable sources such as wind or solar. At part ...
    • Behavior of Francis turbines at part load. Field assessment in prototype: Effects on the hydraulic system. 

      Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard (Institute of Physics (IOP), 2019)
      Conference report
      Open Access
      At present, hydropower plants play an important role because of their flexibility in the generation of electricity. Today, the required operating range of turbine units is expected to extend to deep part load. At part load ...
    • Benefits of battery hybridization in hydraulic turbines. Wear and tear evaluation in a Kaplan prototype 

      Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Drommi, Jean-Louis (2022-11)
      Article
      Open Access
      Kaplan turbines are nowadays used to provide Frequency Containment Reserve (FCR) to the grid due to their fast capacity to regulate their power maintaining high efficiency. However, this continuous power regulation increases ...
    • Characterization of the effects of ingested bodies on the rotor–stator interaction of hydraulic turbines 

      Guardo Zabaleta, Alfredo de Jesús; Fontanals García, Alfred; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (2021-10-14)
      Article
      Open Access
      Runner and distributor blockages in hydraulic turbines occur due to the ingestion of external bodies such as rocks or logs. These obstructions can change the amplitude and uniformity of the pressure pulsations in the ...
    • Condition monitoring of a prototype turbine. Description of the system and main results 

      Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard; Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Bossio, Matias (Institute of Physics (IOP), 2017)
      Conference report
      Open Access
      The fast change in new renewable energy is affecting directly the required operating range of hydropower plants. According to the present demand of electricity, it is necessary to generate different levels of power. Because ...
    • Detection of erosive cavitation on hydraulic turbines through demodulation analysis 

      Presas Batlló, Alexandre; Luo, Yongyao; Valentín Ruiz, David; Egusquiza Montagut, Mònica; Wang, Zhengwei; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (Institute of Physics (IOP), 2018)
      Conference report
      Open Access
      Erosive cavitation in hydraulic turbines affects severely the runner structure, increasing maintenance costs and reducing the remaining useful life of the component. Actual vibro-acoustic techniques used to detect this ...
    • Detection of hydraulic phenomena in francis turbines with different sensors 

      Valentín Ruiz, David; Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard (Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-19)
      Article
      Open Access
      Nowadays, hydropower is demanded to provide flexibility and fast response into the electrical grid in order to compensate the non-constant electricity generation of other renewable sources. Hydraulic turbines are therefore ...
    • 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 ...
    • Dynamic model for axial motion of horizontal pelton turbine and validation in actual failure case 

      Rodriguez Godoy, Cristian Gabriel; Egusquiza Estévez, Eduard; Egusquiza Montagut, Mònica; Reyes, S.; Zambrano, D.; Tapia Ladino, Juan Antonio (2020-01-01)
      Article
      Open Access
      Pelton turbines are important machines for power generation from a renewable energy source such as water. For power rates below 20 MW, the rotor of Pelton turbines is usually in horizontal position. Considering ideal ...
    • Dynamic response of Pelton runners: Numerical and experimental analysis in prototypes 

      Egusquiza Montagut, Mònica; Valentín Ruiz, David; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard (Elsevier, 2020-09-01)
      Article
      Open Access
      Worldwide electricity generation is featured by the growth of intermittent renewable energies. In this context, hydropower plays a fundamental role because it provides flexibility to the power grid and ensures its stability. ...
    • Experimental and numerical investigation on the influence of a large crack on the modal behaviour of a Kaplan turbine blade 

      Zhang, Ming; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard (Elsevier, 2020-01-01)
      Article
      Restricted access - publisher's policy
      A large crack was discovered on one blade of a Kaplan turbine prototype after the inspection of the machine. In order to know the origin of the crack, a failure analysis was previously carried out (Zhang et al., 2019). To ...
    • Experimental investigation on the dynamic response of Pelton runners 

      Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard (Institute of Physics (IOP), 2019)
      Conference report
      Open Access
      An effective condition monitoring is essential to increase the availability of Pelton turbines and to avoid unexpected damage. The main challenge consists in determining the deformations and the stresses in the runner while ...