Now showing items 1-20 of 63

  • A bounded-error approach to simultaneous state and actuator fault estimation for a class of nonlinear systems 

    Buciakowski, Mariusz; Witczak, Marcin; Puig Cayuela, Vicenç; Rotondo, Damiano; Nejjari Akhi-Elarab, Fatiha; Korbicz, Jozef (2017-04-01)
    Article
    Open Access
    This paper proposes an approach for the joint state and fault estimation for a class of uncertain nonlinear systems with simultaneous unknown input and actuator faults. This is achieved by designing an unknown input observer ...
  • Adaptive neural network state predictor and tracking control for nonlinear time-delay systems 

    Na, Jing; Ren, Xuemei; Gao, Yan; Griñó Cubero, Robert; Costa Castelló, Ramon (2010-02)
    Article
    Restricted access - publisher's policy
    A new adaptive nonlinear state predictor (ANSP) is presented for a class of unknown nonlinear systems with input time-delay. A dynamical identification with neu- ral network (NN) is constructed to obtain NN weights and ...
  • Analysis of variations of volterra series models for RF power amplifiers 

    Silveira, Daniel D.; Gilabert Pinal, Pere Lluís; Dos Santos, Alexandre B.; Gadringer, Michael E. (2013)
    Article
    Restricted access - publisher's policy
    This article discusses several different implementations of Volterra seriesmodels, and performs a fair comparison between them using measured data and well known figures of merit. Among the implemented models, an approach ...
  • A set simulation approach to the computation of invariant sets for nonlinear systems 

    Cugueró Escofet, Josep; Saludes Closa, Jordi; Escobet Canal, Teresa (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference lecture
    Restricted access - publisher's policy
    Given a nonlinear discrete-time system, previous works exist that compute invariant sets as finite unions of boxes. Set inversion algorithms based on interval arithmetic are used to obtain inner approximations of the one ...
  • A unified approach for the identification of SISO/MIMO Wiener and Hammerstein systems 

    Ikhouane, Fayçal; Giri, F. (2012)
    Conference lecture
    Open Access
    Hammerstein and Wiener models are nonlinear representations of systems composed by the coupling of a static nonlinearity N and a linear system L in the form N-L and L-N respectively. These models can represent real ...
  • Characterization of a class of differential equations 

    Fuad Mohammad Naser, Mohammad; Bdair, Omar M; Ikhouane, Fayçal (2017-01-01)
    Article
    Open Access
    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 ...
  • Characterization of interfaces between TiCN and iron-base binders 

    Alvaredo, P; Roa Rovira, Joan Josep; Jiménez Piqué, Emilio; Llanes Pitarch, Luis Miguel; Gordo, E (2017-02-01)
    Article
    Open Access
    This work includes a study of the interface between matrix and reinforcement in Fe-Ti(C,N) systems. A study of wettability and solubility between metal and ceramic phases is first performed. It combines wetting experiments ...
  • Coherence and anticoherence resonance tuned by noise 

    Lacasta Palacio, Ana María; Sagués Mestre, Francesc; Sancho, Jose Maria (American Physical Society, 2002-10-24)
    Article
    Open Access
    We present numerical evidence and a theoretical analysis of the appearance of anticoherence resonance induced by noise, not predicted in former analysis of coherence resonance. We have found that this phenomenon occurs for ...
  • Comment on "Diffusion on solif surfaces: anomalous is normal"-Reply 

    Sancho, Jose Maria; Lacasta Palacio, Ana María; Lindenberg, K.; Sokolov, Igor M.; Romero, A. H. (Americah Physical Society, 2005-05-12)
    Article
    Open Access
  • Competitive evaporation in arrays of droplets 

    Lacasta Palacio, Ana María; Sokolov, Igor M.; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 1998-05-31)
    Article
    Open Access
    We consider the evaporation of periodic arrays of initially equal droplets in two-dimensional systems with open ~absorbing! boundaries. Our study is based on the numerical solution of the Cahn-Hilliard equation. We show ...
  • Consistency of heterogeneous synchronization patterns in complex weighted networks 

    Malagarriga Guasch, Daniel; Villa, Alessandro; García Ojalvo, Jordi; Pons Rivero, Antonio Javier (Institute of Physics (IOP), 2017-03-10)
    Article
    Open Access
    Synchronization within the dynamical nodes of a complex network is usually considered homogeneous through all the nodes. Here we show, in contrast, that subsets of interacting oscillators may synchronize in different ways ...
  • Control no lineal del sistema Twin Rotor 

    Badia Martinez, Marc (Universitat Politècnica de Catalunya, 2017-09-13)
    Bachelor thesis
    Open Access
    El Twin Rotor MIMO System és un sistema mecànic amb múltiples entrades i múltiples sortides assimilable a un helicòpter, però d’escala més reduïda. Una diferència destacable entre el Twin Rotor MIMO System i una maqueta ...
  • Design of adaptive funnel control for oxygenation in ventilation therapy 

    Ramón Alfocea, Sergio (Universitat Politècnica de Catalunya, 2014-03-24)
    Master thesis (pre-Bologna period)
    120 months embargo
    [ANGLÈS] The aim of this thesis is to design a control system for regulating oxygenation during mechanical ventilation therapy. For this purpose, funnel control is designed and applied for improving oxygenation. It uses a ...
  • Diffusion on Solid Surface: anomalous is Normal 

    Sancho, Jose Maria; Lacasta Palacio, Ana María; Lindenberg, K.; Sokolov, Igor M.; Romero, A. H. (American Physical Society, 2004-06-23)
    Article
    Open Access
    We present a numerical study of classical particles diffusing on a solid surface. The particles’ motion is modeled by an underdamped Langevin equation with ordinary thermal noise. The particle-surface interaction is described ...
  • Estudi sobre la identificació dels paràmetres d’un model d’un quadrimotor d’escala reduïda 

    Garrido Morales, Sergio (Universitat Politècnica de Catalunya, 2013-09)
    Master thesis (pre-Bologna period)
    Open Access
  • Evaporation and coarsening dynamics with open boundaries 

    Lacasta Palacio, Ana María; Sagués Mestre, Francesc; Sancho, Jose Maria; Sokolov, Igor M. (Americah Physical Society, 1999-01-31)
    Article
    Open Access
    We present a study of the evaporation dynamics of a substance undergoing a coarsening process. The system is modeled by the Cahn-Hilliard equation with absorbing boundaries. We have found that the dynamics, although of ...
  • Exported oscillator competition: a concept to analyze complex rhythms 

    Lacasta Palacio, Ana María; Sancho, Jose Maria; Sagués Mestre, Francesc (American Physical Society, 2005)
    Article
    Open Access
    We study the interaction between two independent nonlinear oscillators competing through a neutral excitable element. The first oscillator, completely deterministic, acts as a normal pacemaker sending pulses to the neutral ...
  • Fault detection in hysteretic base-isolation systems via a seismic disturbance observer 

    Rodriguez Tsouroukdissian, Arturo; Vidal Seguí, Yolanda; Acho Zuppa, Leonardo; Pozo Montero, Francesc (2010)
    Conference lecture
    Open Access
  • Feedback passivity of nonlinear discrete-time systems with direct input-output link 

    Navarro López, Eva María; Fossas Colet, Enric (Elsevier, 2004-03)
    Article
    Open Access
    This paper is devoted to the study of the feedback passivity property in nonlinear discrete-time systems. The relative degree and zero dynamics of the non-passive system are related to the feedback passivity of the system. ...
  • Fractal analysis of growing cities and its relationship with health centre distribution 

    Leyton, Carolina; Redondo Apraiz, José Manuel; Gil Martín, Joan Carles; Tellez Alvarez, Jackson David; Tarquis Alfonso, Ana Maria (Moscow Institute of Physics and Technology (MIPT), 2017-04-15)
    Article
    Open Access
    During recent years, many research group interested in the study of organizational networks from different fields, e.g. studies of behavior of cities growth following the fractal theory. Considering the fractal analysis ...