Articles de revista: Enviaments recents

Ara es mostren els items 1-12 de 78

    • Modelling and adaptive parameter estimation for a piezoelectric cantilever beam 

      Wang, Bin; Costa Castelló, Ramon; Na, Jing; Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier (2022)
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      Accés obert
      This paper proposes a new adaptive estimation approach to online estimate the model parameters of a piezoelectric cantilever beam. The beam behavior is firstly modeled using partial differential equations (PDE) considering ...

    • Shutdown idling performance of the nuclear main coolant pump under station blackout accident: An optimization study 

      Lu, Yonggang; Zhao, Weiqiang; Presas Batlló, Alexandre; Zhu, Rongsheng; Wang, Zhengwei (SAGE publishing, 2022-05-25)
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      Accés restringit per política de l'editorial
      Lead-cooled fast reactor (LFR) is an important reactor type of the Generation IV nuclear energy, and the main coolant pump (MCP) is the only and most critical power equipment in primary circuit of LFR. The shutdown idling ...

    • 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)
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      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 ...

    • 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)
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      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 ...

    • 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)
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      Accés obert
      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)
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      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 ...

    • Prediction of cavitation erosion with different erosion risk indicators 

      Geng, Linlin; Zhang, Dingli; Chen, Jian; Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier (2022-02)
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      Accés obert
      This present work devoted to simulate the unsteady cavitating flow around a hydrofoil and assess its erosion power predicted by different erosion risk indicators. For that, the behavior of unsteady cloud cavity is numerically ...

    • 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)
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      Accés obert
      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 ...

    • 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)
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      Accés obert
      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 ...

    • On the use of neural networks for dynamic stress prediction in Francis turbines by means of stationary sensors 

      Presas Batlló, Alexandre; Valentín Ruiz, David; Zhao, Weiqiang; Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Egusquiza Estévez, Eduard (Elsevier, 2021-06-01)
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      Nowadays, one of the major mechanical issues of hydraulic turbines and particularly Francis turbines are the failures produced by fatigue. Due to the massive entrance of new renewable energies such as wind or solar, hydraulic ...

    • 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)
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      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 ...

    • 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)
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      Accés obert
      The 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 ...