Exploració per tema "Bifurcació, Teoria de la"

Ara es mostren els items 1-20 de 67

    • A frequency domain approach for controlling chaos in switching converters 

      Rodríguez Vilamitjana, Enric; Alarcón Cot, Eduardo José; Iu, H. H. C.; El Aroudi, Abdelali (2010)
      Text en actes de congrés
      Accés obert
      The purpose of this paper is the synthesis from the frequency domain standpoint of a controller for switching power converters with the aim to eliminate bifurcation and chaotic behavior. Firstly the paper analyzes the ...

    • A structured study on the dynamic bifurcation behavior of a continuous ethanol fermentor 

      Ojeda Toro, Juan Carlos; Dobrosz-Gómez, Izabela; Gómez-García, Miguel Ángel; Prat Farran, Joana d'Arc; Massana Hugas, Immaculada (2021-05)
      Article
      Accés obert
      The oscillatory behavior of a continuous fermentation reactor, in the high feed sugar concentration region (200 g/L), is analyzed using the dynamic bifurcation theory. The mathematical model was solved using the arc-length ...

    • Aerodynamic performances and wake topology past a square cylinder in the interface of two different-velocity streams 

      El Mansy, Reda; Bergadà Granyó, Josep Maria; Sarwar, Wasim; Mellibovsky Elstein, Fernando (American Institute of Physics (AIP), 2022-06-02)
      Article
      Accés obert
      We analyze the incompressible flow past a square cylinder immersed in the wake of an upstream splitter plate, which separates two streams of different velocities, UT (top) and UB (bottom). The Reynolds number associated ...

    • Analysis of bifurcation behavior of a piecewise linear vibrator with electromagnetic coupling for energy harvesting applications 

      El Aroudi, Abdelali; Ouakad, Hassen; Benadero García-Morato, Luis; Younis, Mohammad (2014-05)
      Article
      Accés obert
      Recently, nonlinearities have been shown to play an important role in increasing the extracted energy of vibration-based energy harvesting systems. In this paper, we study the dynamical behavior of a piecewise linear (PWL) ...

    • Bifurcation analysis in a self-oscillating series resonant converter 

      Ponce, Enrique; Benadero García-Morato, Luis; El Aroudi, Abdelali (De Gruyter Open Sp. z o.o., 2020-02-10)
      Capítol de llibre
      Accés restringit per política de l'editorial
      In this paper, the dynamics of a dc-ac resonant self-oscillating LC series inverter is analyzed from the point of view of piecewise smooth dynamical systems. The system under study is defined by two symmetric configurations ...

    • Bifurcation analysis of a DC–DC bidirectional power converter operating with constant power loads 

      Cristiano, Rony; Pagano, Daniel J.; Benadero García-Morato, Luis; Ponce, Enrique (2016-04)
      Article
      Accés obert
      Direct current (DC) microgrids (MGs) are an emergent option to satisfy new demands for power quality and integration of renewable resources in electrical distribution systems. This work addresses the large-signal stability ...

    • 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 ...

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

      Cima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, Víctor (2018-01)
      Article
      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 ...

    • Bifurcation patterns in homogeneous area-preserving piecewise-linear maps 

      Benadero García-Morato, Luis; Freire Macías, Emilio; Ponce Núñez, Enrique; Torres Peral, Francisco (2018-11-26)
      Article
      Accés obert
      The dynamical behavior of a family of planar continuous piecewise linear maps with two zones is analyzed. Assuming homogeneity and preservation of areas we obtain a canonical form with only two parameters: the traces of ...

    • Bifurcations analysis of oscillating hypercycles 

      Guillamon Grabolosa, Antoni; Fontich, Ernest; Sardañés, Josep (2015-12-21)
      Article
      Accés obert
      We investigate the dynamics and transitions to extinction of hypercycles governed by periodic orbits. For a large enough number of hypercycle species (n > 4) the existence of a stable periodic orbit has been previously ...

    • Bifurcations to quasiperiodicity of the torsional solutions of convection in rotating fluid spheres: techniques and results 

      Sánchez Umbría, Juan; Net Marcé, Marta (2022-11-07)
      Article
      Accés obert
      The linear stability of the periodic and axisymmetric solutions of the convection in rotating, internally heated, and self-gravitating fluid spheres is presented. The transition to quasiperiodic flows via Neimark–Sacker ...

    • Breakdown of heteroclinic connections in the analytic Hopf-zero singularity: rigorous computation of the stokes constant 

      Baldomá Barraca, Inmaculada; Capinski, Maciej J.; Guàrdia Munarriz, Marcel; Martínez-Seara Alonso, M. Teresa (2023-04-01)
      Article
      Accés obert
      Consider analytic generic unfoldings of the three- dimensional conservative Hopf-zero singularity. Under open conditions on the parameters determining the singularity, the unfolding possesses two saddle-foci when the ...

    • Breakdown of heteroclinic orbits for some analytic unfoldings of the Hopf-zero singularity 

      Baldomá Barraca, Inmaculada; Martínez-Seara Alonso, M. Teresa (2004)
      Article
      Accés obert
      In this paper we study the exponentially small splitting of a heteroclinic orbit in some unfoldings of the central singularity also called Hopf-zero singularity. The fields under consideration are of the form: dx dτ = ...

    • Buffering and total calcium levels determine the presence of oscillatory regimes in cardiac cells 

      Marchena Angos, Miquel; Echebarría Domínguez, Blas; Shiferaw, Yohannes; Álvarez Lacalle, Enrique (2020-09-24)
      Article
      Accés obert
      Calcium oscillations and waves induce depolarization in cardiac cells which are believed to cause life-threathening arrhythimas. In this work, we study the conditions for the appearance of calcium oscillations in both a ...

    • Chaos in the buck converter 

      Olivar, Gerard (Universitat Politècnica de Catalunya, 1997-07-01)
      Tesi
      Accés obert
      Esta tesis estudia el fenómeno del caos en las ecuaciones que modelan un convertidor buck con control PWM. Desde el punto de vista matemático, contribuye al estudio de los sistemas lineales a trozos tridimensionales, con ...

    • La constant de Feigenbaun 

      Pereira Hernández, Miguel (Universitat Politècnica de Catalunya, 2018-07)
      Treball Final de Grau
      Accés obert
      Aquest treball comença amb una petita introducció a la teoria de bifurcacions amb un exemple d'aplicació unimodal. Després, es presenten els resultats teòrics que permeten entendre com es produeix la cascada de doblament ...

    • Continuation of bifurcations of cycles in dissipative PDEs 

      Sánchez Umbría, Juan; Net Marcé, Marta (2015)
      Text en actes de congrés
      Accés obert
      A new efficient methodology for the continuation of the codimension-one bifurcations of periodic orbits, including pitchfork bifurcations present in reflection--symmetric systems, has been developed. It is based on the ...

    • Continuation of bifurcations of periodic orbits for large-scale systems 

      Net Marcé, Marta; Sánchez Umbría, Juan (2015-01-01)
      Article
      Accés obert
      A methodology to track bifurcations of periodic orbits in large-scale dissipative systems depending on two parameters is presented. It is based on the application of iterative Newton-Krylov techniques to extended systems. ...

    • Convectons, anticonvectons and multiconvectons in binary fluid convection 

      Mercader Calvo, María Isabel; Batiste Boleda, Oriol; Alonso Maleta, María Aránzazu; Knobloch, Edgar (2011-01-25)
      Article
      Accés obert
      Binary fluid mixtures with a negative separation ratio heated from below exhibit steady spatially localized states called convectons for supercritical Rayleigh numbers. Numerical continuation is used to compute such states ...

    • Correlation lags give early warning signals of approaching bifurcations 

      Tirabassi, Giulio; Masoller Alonso, Cristina (2022-02-01)
      Article
      Accés obert
      Identifying approaching bifurcations and regime transitions from observations is an important challenge in time series analysis with practical applications in many fields of science. Well-known indicators are the increase ...