Enviaments recents

  • Bifurcation of 2-periodic orbits from non-hyperbolic fixed points 

    Cima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, Víctor (2017-07-21)
    Report de recerca
    Accés obert
    We introduce the concept of 2-cyclicity for families of one-dimensional maps with a non-hyperbolic fixed point by analogy to the cyclicity for families of planar vector fields with a weak focus. This new concept is useful ...
  • Periodic points, Lie symmetries and non-integrability of planar maps 

    Cima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, Víctor (2017-07-03)
    Presentació
    Accés obert
  • Ensemble learning as approach for pipeline condition assessment 

    Camacho-Navarro, Jhonatan; Ruiz Ordóñez, Magda; Villamizar Mejía, Rodolfo; Mujica Delgado, Luis Eduardo; Moreno Beltran, Gustavo Adolfo (Ghent University, 2017)
    Text en actes de congrés
    Accés obert
    The algorithms commonly used for damage condition monitoring present several drawbacks related to unbalanced data, optimal training requirements, low capability to manage feature diversity and low tolerance to errors. In ...
  • Structural damage localization through an innovative hybrid ensemble approach 

    Moreno Beltran, Gustavo Adolfo; Villamizar Mejía, Rodolfo; Camacho-Navarro, Jhonatan; Ruiz Ordóñez, Magda; Mujica Delgado, Luis Eduardo (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Damage localization in structures can be achieved by using an appropriate data interpretation algorithm based on the expected structural response. According to the several algorithms reported in literature, a different ...
  • A machine learning methodology for structural damage classification in structural health monitoring 

    Pozo Montero, Francesc; Tibaduiza Burgos, Diego Alexander; Anaya Vejar, Maribel; Vitola Oyaga, Jaime (2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    One of the goals of structural health monitoring (SHM) applications is to determine the presence and the severity of a damage. In some cases, this is an element to forecast the behaviour and take decisions to allocate ...
  • Signal-based bending stress monitoring using guided waves in hollow cylinders 

    Quiroga, Jabid; Mujica Delgado, Luis Eduardo; Villamizar Mejía, Rodolfo; Ruiz Ordóñez, Magda; Camacho-Navarro, Jhonatan (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This work provides a time domain approach to detect stress changes in hollow cylinders using low frequency ultrasound guided waves; the proposed scheme makes uses of the subtract method for stress level estimation. Residuals ...
  • Use of wiris quizzes in an online calculus course 

    Calm, Remei; Masià, Ramon; Olivé, Carme; Parés Mariné, Núria; Pozo Montero, Francesc; Ripoll, Jordi; Sancho Vinuesa, Teresa (Omnia Publisher SL (OmniaScience), 2017)
    Article
    Accés obert
    Calculus courses often present a large number of difficulties to undergraduate students of scientific studies, especially in engineering degrees. These difficulties are sometimes related to teaching and assessment strategies. ...
  • Wind turbine synchronous reset pitch control 

    Vidal Seguí, Yolanda; Acho Zuppa, Leonardo; Cifre Font, Ignasi; Garcia Manzanera, Àlex; Pozo Montero, Francesc; Rodellar Benedé, José (2017-06-01)
    Article
    Accés obert
    Reset controllers are commonly used to smooth the transient response of systems. We use this technique to improve a standard baseline pitch controller for offshore wind turbines (WTs). The introduction of this strategy ...
  • Distributed piezoelectric sensor system for damage identification in structures subjected to temperature changes 

    Vitola Oyaga, Jaime; Pozo Montero, Francesc; Tibaduiza Burgos, Diego Alexander; Anaya Vejar, Maribel (2017-05-31)
    Article
    Accés obert
    Structural health monitoring (SHM) is a very important area in a wide spectrum of fields and engineering applications. With an SHM system, it is possible to reduce the number of non-necessary inspection tasks, the associated ...
  • Characterization of a class of differential equations 

    Fuad Mohammad Naser, Mohammad; Bdair, Omar M; Ikhouane, Fayçal (2017-01-01)
    Article
    Accés obert
    This paper deals with a characterization of nonlinear systems of the form x<sub>¿</sub> (t) = f (x<sub>¿</sub>(t), u(t/¿)) when the parameter ¿ ¿ 8. In particular, we are interested in the uniform convergence of the sequence ...

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