Recent Submissions

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • The potential for photovoltaic-powered pumped-hydro systems to reduce emissions, costs, and energy insecurity in rural China 

    Yang, Zongru; Sun, Guoxiu; Behrens, Paul; Østergaard, Poul Alberg; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Xu, Beibei; Chen, Diyi; Patelli, Edoardo (Elsevier, 2021-09)
    Article
    Open Access
    Homes in rural China often have access to water wells for domestic and agricultural use. Given the significant difference in height between the well water and the roof of the house, such an arrangement could be used as a ...
  • Exploring the Regulation Reliability of a Pumped Storage Power Plant in a Wind–Solar Hybrid Power Generation System 

    Xu, Beibei; Zhang, Jingjing; Egusquiza Montagut, Mònica; Zhang, Junzhi; Chen, Diyi; Egusquiza Estévez, Eduard (2021-09-17)
    Article
    Open Access
    In the coming decades, the proportion of wind–solar energy in power system significantly increases, resulting to uncertainties of power fluctuation in abundant wind–solar energy regions. The flexibility operation of Pumped ...
  • Combination of acoustic emission and vibratory measure-ments to characterize an ultrasonic vibration assisted ball burnishing tool for a lathe 

    Fernández Osete, Ismael; Estévez Urra, Aida; Velázquez Corral, Eric; Valentín Ruiz, David; Llumà Fuentes, Jordi; Jerez Mesa, Ramón; Travieso Rodriguez, Jose Antonio (2021-07-14)
    Article
    Open Access
    In this paper, a resonant system that produces a movement of low amplitude and ultrasonic frequency is used to achieve the vibration assistance in a ball-burnishing process. A full vibration characterization of this process ...
  • On the use of vibrational hill charts for improved condition monitoring and diagnosis of hydraulic turbines 

    Zhao, Weiqiang; Presas Batlló, Alexandre; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen (2022-01-22)
    Article
    Open Access
    To cope with the intermittent power supply of the new renewable energies and demand fluctuations, Francis turbines are required to operate more and more in an extended operating range, far away from the design point. With ...
  • Failure investigation of a solar tracker due to wind-induced torsional galloping 

    Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Presas Batlló, Alexandre (Elsevier, 2022-05-01)
    Article
    Open Access
    Solar power installations are increasing every year due to the decarbonization policy established around the world. Photovoltaic (PV) systems and specifically one-axis solar trackers are the most used type of installations ...
  • On the quantification of local power densities in a new vibration bioreactor 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Roehr, Charline; Mele, Elisa; Bieh, Christoph; Heiss, Christian; Bosbach, Wolfram A. (Public Library of Science (PLOS), 2021-01-01)
    Article
    Open Access
    We investigate the power densities which are obtainable locally in a vibration bioreactor. These reactor systems are of great relevance for research about oncological or antibacterial therapies. Our focus lies on the local ...
  • 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
    Restricted access - publisher's policy
    The 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 ...
  • Implant resonance and the mechanostat theory: Applications of therapeutic ultrasound for porous metallic scaffolds 

    Deering, Joseph; Presas Batlló, Alexandre; Yu, Bosco; Valentín Ruiz, David; Heiss, Christian; Bosbach, Wolfram A.; Grandfield, Kathryn (Elsevier, 2021-06-01)
    Article
    Restricted access - publisher's policy
    The development of treatment strategies for improving secondary stability at the bone-implant interface is a challenge. Porous implants are one solution for improving long-term implant stability, but the osteoconduction ...

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