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Ara es mostren els items 9-28 de 38

    • Demagnetization diagnosis in permanent magnet synchronous motors under non-stationary speed conditions 

      Riba Ruiz, Jordi-Roger; García Espinosa, Antonio; Romeral Martínez, José Luis; Cusidó Roura, Jordi (2010-10)
      Article
      Accés restringit per política de l'editorial
      Permanent magnet synchronous motors (PMSMs) are applied in high performance positioning and variable speed applications because of their enhanced features with respect to other AC motor types. Fault detection and diagnosis ...

    • Detection of Wind Turbine Failures through Cross-Information between Neighbouring Turbines 

      Marti Puig, Pere; Cusidó Roura, Jordi; Lozano, Francico J.; Serra Serra, Moisès; Caiafa, Cesar F.; Sole Casals, Jordi (Multidisciplinary Digital Publishing Institute, 2022-10-01)
      Article
      Accés obert
      In this paper, the time variation of signals from several SCADA systems of geographically closed turbines are analysed and compared. When operating correctly, they show a clear pattern of joint variation. However, the ...

    • Development of a Mobile Application for People with Obesity 

      Álvarez-Moya, Eva M.; Mirallas, Judit; Fontanals Padrós, Clara; Quintana Aparicio, Maria; Cusidó Roura, Jordi; Rimbau Almendros, Jordi; Garolera, Maite (2021-01-01)
      Article
      Accés obert

    • Diagnosis method for suspension-errors detection in electro-dynamic loud-speakers 

      Sala Caselles, Vicenç; Delgado Prieto, Miquel; Cusidó Roura, Jordi; Romeral Martínez, José Luis (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, the wear of the suspensions in a speaker. This phenomenon can be characterized and seen as a variation of half inductance seen from the amplifier, because that value depends directly on the minimum and ...

    • Dynamic evaluation of fringing flux in linear electromechanical devices 

      García Espinosa, Antonio; Riba Ruiz, Jordi-Roger; Cusidó Roura, Jordi; Romeral Martínez, José Luis; Ortega Redondo, Juan Antonio (2010-03-12)
      Article
      Accés restringit per política de l'editorial
      Accurate dynamic models of electromechanical devices are essential in order to develop effective motion control strategies of such devices. The effects of fringing flux can not be ignored when dealing with electromagn ...

    • Effects of the pre-processing algorithms in fault diagnosis of wind turbines 

      Marti Puig, Pere; Blanco Martínez, Alejandro; Cárdenas Araújo, Juan José; Cusidó Roura, Jordi; Sole Casals, Jordi (Elsevier, 2018-12)
      Article
      Accés obert
      The wind sectors pends roughly 2200M€ in repair the wind turbines failures. These failures do not contribute to the goal of reducing greenhouse gases emissions. The 25–35% of the generation costs are operation and maintenance ...

    • EMA fault detection using fuzzy inference tools 

      Cusidó Roura, Jordi; Delgado Prieto, Miquel; Romeral Martínez, José Luis (2012-03-02)
      Capítol de llibre
      Accés obert
      Acoustic emission (AE) is one of the most important non-destructive testing (NDT) methods for materials, constructions and machines. Acoustic emission is defined as the transient elastic energy that is spontaneously released ...

    • Estudio de microgrids con interfases de convertidores de DC/AC 

      Andrade Rengifo, Fabio; Kampouropoulos, Konstantinos; Cusidó Roura, Jordi; Romeral Martínez, José Luis (2011)
      Text en actes de congrés
      Accés obert
      Este artículo presenta un estudio de Microgrids con interfases de convertidores DC/AC. El artículo muestra los modos de operación de las Microgrids, además implementa un modelo de pequeña señal para el modo de operación ...

    • Exploratory analysis of SCADA data from wind urbines using the K-Means clustering algorithm for predictive maintenance purposes 

      Cosa Rodríguez, Pablo; Marti Puig, Pere; Caiafa, Cesar F.; Serra Serra, Moisès; Cusidó Roura, Jordi; Sole Casals, Jordi (2023-02-10)
      Article
      Accés obert
      Product maintenance costs throughout the product’s lifetime can account for between 30–60% of total operating costs, making it necessary to implement maintenance strategies. This problem not only affects the economy but ...

    • Fault detection by means of Hilbert-Huang transform of the stator current in a PMSM with demagnetization 

      García Espinosa, Antonio; Rosero García, Javier Alveiro; Cusidó Roura, Jordi; Romeral Martínez, José Luis; Ortega Redondo, Juan Antonio (2010-06)
      Article
      Accés obert
      This paper presents a novel method to diagnose demagnetization in permanent-magnet synchronousmotor (PMSM). Simulations have been performed by 2-D finite-element analysis in order to determine the current spectrum and ...

    • Fault-Tolerant Control of a Wind Turbine Generator Based on Fuzzy Logic and Using Ensemble Learning 

      Cusidó Roura, Jordi; López Flores, Arnau; Beretta, Mattia (2021-08-20)
      Article
      Accés obert
      Wind energy is a form of renewable energy with the highest installed capacity. However, it is necessary to reduce the operation and maintenance costs and extend the lifetime of wind turbines to make wind energy more ...

    • Feature Selection Algorithms for Wind Turbine Failure Prediction 

      Marti Puig, Pere; Blanco Martínez, Alejandro; Cárdenas Araújo, Juan José; Cusidó Roura, Jordi; Sole Casals, Jordi (2019-01-31)
      Article
      Accés obert
      It is well known that each year the wind sector has profit losses due to wind turbine failures and operation and maintenance costs. Therefore, operations related to these actions are crucial for wind farm operators and ...

    • Identifying health status of wind turbines by using self organizing maps and interpretation-oriented post-processing tools 

      Blanco, Alejandro; Gibert, Karina; Marti Puig, Pere; Cusidó Roura, Jordi; Sole Casals, Jordi (2018-04-01)
      Article
      Accés obert
      Identifying the health status of wind turbines becomes critical to reduce the impact of failures on generation costs (between 25–35%). This is a time-consuming task since a human expert has to explore turbines individually. ...

    • Improved ensemble learning for wind turbine main bearing fault diagnosis 

      Beretta, Mattia; Vidal Seguí, Yolanda; Sepúlveda, José; Porro Martorell, Olga; Cusidó Roura, Jordi (Multidisciplinary Digital Publishing Institute, 2021-08-17)
      Article
      Accés obert
      The goal of this paper is to develop, implement, and validate a methodology for wind turbines’ main bearing fault prediction based on an ensemble of an artificial neural network (normality model designed at turbine level) ...

    • Mantenimiento predictivo de aerogeneradores a partir de datos de datos SCADA 

      Cusidó Roura, Jordi (2019-06)
      Article
      Accés obert
      El mantenimiento predictivo en aerogeneradores es un valor en alza. La extensión de vida es una tendencia clara del sector en la que ya están trabajando operadores como Acciona, Naturgy e Innogy, y ello requiere de un ...

    • Motor fault detection using a Rogowski sensor without an integrator 

      Poncelas, O; Rosero García, Javier Alveiro; Cusidó Roura, Jordi; Ortega Redondo, Juan Antonio; Romeral Martínez, José Luis (2009-10)
      Article
      Accés obert
      This paper presents a new approach for the current acquisition system in motor fault detection applications. This paper includes the study, design, and implementation of a Rogowski coil current sensor without the integrator ...

    • New mathematical model of an inverter-based generator for stability studies of microgrid Systems 

      Andrade Rengifo, Fabio; Romeral Martínez, José Luis; Kampouropoulos, Konstantinos; Cusidó Roura, Jordi (2013)
      Text en actes de congrés
      Accés obert
      A new mathematical model of a renewable generator, with a DC-AC interface, based on the concept of electrostatic machine is presented. This new model has a direct relationship between the DC and AC side. Moreover, it can ...

    • New model of a converter-based generator using electrostatic synchronous machine concept 

      Andrade Rengifo, Fabio; Romeral Martínez, José Luis; Cusidó Roura, Jordi; Cárdenas Araújo, Juan José (2014-06-01)
      Article
      Accés restringit per política de l'editorial
      In this paper, a new method for modeling converter-based power generators in ac-distributed systems is proposed. It is based on the concept of electrostatic synchronous machines. With this new concept, it is possible to ...

    • On-line fault detection method for induction machines based on signal convolution 

      Cusidó Roura, Jordi; Romeral Martínez, José Luis; García Espinosa, Antonio; Ortega Redondo, Juan Antonio; Riba Ruiz, Jordi-Roger (2010-06-28)
      Article
      Accés obert
      A new technique for induction motor fault detection and diagnosis is presented. This technique, which has been experimentally verified in stationary and non-stationary motor conditions, is based on the convolution of ...

    • Predicting hospital admissions to reduce crowding in the emergency departments 

      Cusidó Roura, Jordi; Comalrena, Joan; Alavi, Hamidreza; Llunas Mestres, Laia (Multidisciplinary Digital Publishing Institute, 2022-10-24)
      Article
      Accés obert
      Having an increasing number of patients in the emergency department constitutes an obstacle to the admissions process and hinders the emergency department (ED)’s ability to deal with the continuously arriving demand for ...