Enviaments recents

  • Tachyons in the Galilean limit 

    Batlle Arnau, Carles; Gomis Torné, Joaquin; Mezincescu, Luca; Townsend, Paul K. (2017-04-20)
    Article
    Accés obert
    The Souriau massless Galilean particle of “colour” k and spin s is shown to be the Galilean limit of the Souriau tachyon of mass m = ik and spin s. We compare and contrast this result with the Galilean limit of the Nambu-Goto ...
  • Nonlinear predictive control for durability enhancement and efficiency improvement in a fuel cell power system 

    Luna Pacho, Julio Alberto; Jemei, Samir; Yousfi-Steiner, Nadia; Husar, Attila Peter; Serra, Maria; Hissel, Daniel (2016)
    Article
    Accés obert
    In this work, a nonlinear model predictive control (NMPC) strategy is proposed to improve the efficiency and enhance the durability of a proton exchange membrane fuel cell (PEMFC) power system. The PEMFC controller is based ...
  • Extended Galilean symmetries of non-relativistic strings 

    Batlle Arnau, Carles; Gomis Torné, Joaquin; Not, Daniel (2017-02-09)
    Article
    Accés obert
    We consider two non-relativistic strings and their Galilean symmetries. These strings are obtained as the two possible non-relativistic (NR) limits of a relativistic string. One of them is non-vibrating and represents a ...
  • Integral MRAC with Minimal Controller Synthesis and bounded adaptive gains: The continuous-time case 

    Montanaro, Umberto; Olm Miras, Josep Maria (2016-12-01)
    Article
    Accés restringit per política de l'editorial
    Model reference adaptive controllers designed via the Minimal Control Synthesis (MCS) approach are a viable solution to control plants affected by parameter uncertainty, unmodelled dynamics, and disturbances. Despite its ...
  • A unified approach to explain contrary effects of hysteresis and smoothing in nonsmooth systems 

    Bonet Revés, Carles; Martínez-Seara Alonso, M. Teresa; Fossas Colet, Enric; Jeffrey, Mike R. (2017-09-01)
    Article
    Accés restringit per política de l'editorial
    Piecewise smooth dynamical systems make use of discontinuities to model switching between regions of smooth evolution. This introduces an ambiguity in prescribing dynamics at the discontinuity: should the dynamics be given ...
  • Nonlinear observation in fuel cell systems: a comparison between disturbance estimation and High-Order Sliding-Mode techniques 

    Luna Pacho, Julio Alberto; Usai, Elio; Husar, Attila Peter; Serra, Maria (2016-11-16)
    Article
    Accés obert
    This paper compares two Nonlinear Distributed Parameter Observers (NDPO) for the observation of a Proton Exchange Membrane Fuel Cell (PEMFC). Both NDPOs are based on the discretisation of distributed parameters models and ...
  • Ibilgailu elektrikoen propultsio-sistemak: motor elektrikoak eta horien kontrola 

    Trancho, Elena; Ibarra Basabe, Edorta; Arias Pujol, Antoni; Sabihi, Nima; López, Iraide (2016-01-04)
    Article
    Accés obert
    This article provides a state of the art of the electric machine technology used in Electric and Hybrid Electric Vehicle applications. Most common FOC (Field Oriented Control) and the DTC (Direct Torque Control) ...
  • Equivalence between the Hamiltonian and Lagrangian formalisms for constrained systems 

    Batlle Arnau, Carles; Gomis Torné, Joaquin; Pons Ràfols, Josep Maria; Román Roy, Narciso (1986-08)
    Article
    Accés obert
    The equivalence between the Lagrangian and Hamiltonian formalism is studied for constraint systems. A procedure to construct the Lagrangian constraints from the Hamiltonian constraints is given. Those Hamiltonian constraints ...
  • Model predictive control for ethanol steam reformers with membrane separation 

    Serra, Maria; Ocampo-Martínez, Carlos; Li, Mingming; Llorca Piqué, Jordi (2017-01-26)
    Article
    Accés restringit per política de l'editorial
    This paper focuses on the dynamic modelling and the predictive control of an ethanol steam reformer (ESR) with Pdsingle bondAg membrane separation stage for the generation of pure hydrogen. Hydrogen purity necessary to ...
  • Hinf current controller for input admittance shaping of VSC-based grid applications 

    Pérez, Jorge; Cóbreces Álvarez, Santiago; Griñó Cubero, Robert; Rodriguez Sanchez, Francisco Javier (2017-04-01)
    Article
    Accés obert
    This paper presents a current controller that shapes, in the frequency domain, the input admittance of voltage-source converters connected to the grid. The controller is obtained by means of a H8 synthesis procedure, which ...

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