Articles de revista
http://hdl.handle.net/2117/3918
20170122T10:37:00Z

Noncommutative integrable systems on bsymplectic manifolds
http://hdl.handle.net/2117/99720
Noncommutative integrable systems on bsymplectic manifolds
Miranda Galcerán, Eva; Kiesenhoferb, Anna
In this paper we study noncommutative integrable systems on bPoisson manifolds. One important source of examples (and motivation) of such systems comes from considering noncommutative systems on manifolds with boundary having the right asymptotics on the boundary. In this paper we describe this and other examples and prove an actionangle theorem for noncommutative integrable systems on a bsymplectic manifold in a neighborhood of a Liouville torus inside the critical set of the Poisson structure associated to the bsymplectic structure.
20170119T15:20:40Z
Miranda Galcerán, Eva
Kiesenhoferb, Anna
In this paper we study noncommutative integrable systems on bPoisson manifolds. One important source of examples (and motivation) of such systems comes from considering noncommutative systems on manifolds with boundary having the right asymptotics on the boundary. In this paper we describe this and other examples and prove an actionangle theorem for noncommutative integrable systems on a bsymplectic manifold in a neighborhood of a Liouville torus inside the critical set of the Poisson structure associated to the bsymplectic structure.

Criterios para practicas de evaluación de calidad
http://hdl.handle.net/2117/99596
Criterios para practicas de evaluación de calidad
Cadenato, Ana; Martínez Martínez, María del Rosario; Gallego Fernández, María Isabel; Amante García, Beatriz; Jordana Barnils, José; Farrerons Vidal, Óscar; Isalgue Buxeda, Antonio; Fabregat Fillet, Jaume
El grupo de innovación GRAPA ( GRupo de la Evaluación de la Práctica Académica ) d el proyecto RIMA de la Universitat Politècnica de Catalunya ha elaborado una serie de criterios , en forma de rúbrica, como buenas prácticas de evaluación , c oherentes con la integración y evaluación de competencias , exigencia en la imp lantación de los nuevos grados que se imparten en los estudios superiores en las universidades españolas . En la presente comunicación se podrá comprobar que además cualquier actividad de evaluación que cumpla estos criterios en el máximo nivel de exigencia representa una actividad de calidad, demostrando que se pueden tener asignatura s de calidad , objetivo común tanto de instituciones como de l profesorado y alumnado . Además en la presente comunicación se mostrarán alguno s ejemplos de estos criterios
20170118T13:22:27Z
Cadenato, Ana
Martínez Martínez, María del Rosario
Gallego Fernández, María Isabel
Amante García, Beatriz
Jordana Barnils, José
Farrerons Vidal, Óscar
Isalgue Buxeda, Antonio
Fabregat Fillet, Jaume
El grupo de innovación GRAPA ( GRupo de la Evaluación de la Práctica Académica ) d el proyecto RIMA de la Universitat Politècnica de Catalunya ha elaborado una serie de criterios , en forma de rúbrica, como buenas prácticas de evaluación , c oherentes con la integración y evaluación de competencias , exigencia en la imp lantación de los nuevos grados que se imparten en los estudios superiores en las universidades españolas . En la presente comunicación se podrá comprobar que además cualquier actividad de evaluación que cumpla estos criterios en el máximo nivel de exigencia representa una actividad de calidad, demostrando que se pueden tener asignatura s de calidad , objetivo común tanto de instituciones como de l profesorado y alumnado . Además en la presente comunicación se mostrarán alguno s ejemplos de estos criterios

Wind turbine fault detection through principal component analysis and statistical hypothesis testing
http://hdl.handle.net/2117/99593
Wind turbine fault detection through principal component analysis and statistical hypothesis testing
Pozo Montero, Francesc; Vidal Seguí, Yolanda
This work addresses the problem of online fault detection of an advanced wind turbine benchmark under actuators (pitch and torque) and sensors (pitch angle measurement) faults of different type. The fault detection scheme starts by computing the baseline principal component analysis (PCA) model from the healthy wind turbine. Subsequently, when the structure is inspected or supervised, new measurements are obtained and projected into the baseline PCA model. When both sets of data are compared, a statistical hypothesis testing is used to make a decision on whether or not the wind turbine presents some fault. The effectiveness of the proposed faultdetection scheme is illustrated by numerical simulations on a wellknown large wind turbine in the presence of wind turbulence and realistic fault scenarios.
20170118T13:07:43Z
Pozo Montero, Francesc
Vidal Seguí, Yolanda
This work addresses the problem of online fault detection of an advanced wind turbine benchmark under actuators (pitch and torque) and sensors (pitch angle measurement) faults of different type. The fault detection scheme starts by computing the baseline principal component analysis (PCA) model from the healthy wind turbine. Subsequently, when the structure is inspected or supervised, new measurements are obtained and projected into the baseline PCA model. When both sets of data are compared, a statistical hypothesis testing is used to make a decision on whether or not the wind turbine presents some fault. The effectiveness of the proposed faultdetection scheme is illustrated by numerical simulations on a wellknown large wind turbine in the presence of wind turbulence and realistic fault scenarios.

A chaotic secure communication system design based on iterative learning control theory
http://hdl.handle.net/2117/99579
A chaotic secure communication system design based on iterative learning control theory
Acho Zuppa, Leonardo
This paper presents an application of Iterative Learning Control (ILC) theory to secure communication system design by using chaotic signals, where the logisticmap is employed as a source of chaos. Meanwhile, the ILC scheme is employed as a tool to encrypt and decrypt a message. A set of numerical experiments is realized to evidence the performance of our system, including the noisy case on the channels of communication of the proposed scheme.
20170118T11:58:41Z
Acho Zuppa, Leonardo
This paper presents an application of Iterative Learning Control (ILC) theory to secure communication system design by using chaotic signals, where the logisticmap is employed as a source of chaos. Meanwhile, the ILC scheme is employed as a tool to encrypt and decrypt a message. A set of numerical experiments is realized to evidence the performance of our system, including the noisy case on the channels of communication of the proposed scheme.

Switching frequency regulation in sliding mode control by a hysteresis band controller
http://hdl.handle.net/2117/99560
Switching frequency regulation in sliding mode control by a hysteresis band controller
Repecho del Corral, Víctor; Biel Solé, Domingo; Olm Miras, Josep Maria; Fossas Colet, Enric
Fixing the switching frequency is a key issue in sliding mode control implementations. This paper presents a hysteresis band controller capable of setting a constant value for the steadystate switching frequency of a sliding mode controller in regulation and tracking tasks. The proposed architecture relies on a piecewise linear modeling of the switching function behavior within the hysteresis band, and consists of a discretetime integraltype controller that modifies the amplitude of the hysteresis band of the comparator in accordance with the error between the desired and the actually measured switching period. For tracking purposes, an additional feedforward action is introduced to compensate the time variation of the switching function derivatives at either sides of the switching hyperplane in the steady state. Stability proofs are provided, and a design criterion for the control parameters to guarantee closedloop stability is subsequently derived. Numerical simulations and experimental results validate the proposal.
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20170118T07:35:30Z
Repecho del Corral, Víctor
Biel Solé, Domingo
Olm Miras, Josep Maria
Fossas Colet, Enric
Fixing the switching frequency is a key issue in sliding mode control implementations. This paper presents a hysteresis band controller capable of setting a constant value for the steadystate switching frequency of a sliding mode controller in regulation and tracking tasks. The proposed architecture relies on a piecewise linear modeling of the switching function behavior within the hysteresis band, and consists of a discretetime integraltype controller that modifies the amplitude of the hysteresis band of the comparator in accordance with the error between the desired and the actually measured switching period. For tracking purposes, an additional feedforward action is introduced to compensate the time variation of the switching function derivatives at either sides of the switching hyperplane in the steady state. Stability proofs are provided, and a design criterion for the control parameters to guarantee closedloop stability is subsequently derived. Numerical simulations and experimental results validate the proposal.

On fuzzyqualitative descriptions and entropy
http://hdl.handle.net/2117/99417
On fuzzyqualitative descriptions and entropy
Prats Duaygues, Francesc; Roselló Saurí, Llorenç; Sánchez Soler, Monica; Agell Jané, Núria
This paper models the assessments of a group of experts when evaluating different magnitudes, features or objects by using linguistic descriptions. A new general representation of linguistic descriptions is provided by unifying ordinal and fuzzy perspectives. Fuzzy qualitative labels are proposed as a generalization of the concept of qualitative labels over a wellordered set. A lattice structure is established in the set of fuzzyqualitative labels to enable the introduction of fuzzyqualitative descriptions as Lfuzzy sets. A theorem is given that characterizes finite fuzzy partitions using fuzzyqualitative labels, the cores and supports of which are qualitative labels. This theorem leads to a mathematical justification for commonlyused fuzzy partitions of real intervals via trapezoidal fuzzy sets. The information of a fuzzyqualitative label is defined using a measure of specificity, in order to introduce the entropy of fuzzyqualitative descriptions. (C) 2016 Elsevier Inc. All rights reserved.
20170117T10:27:49Z
Prats Duaygues, Francesc
Roselló Saurí, Llorenç
Sánchez Soler, Monica
Agell Jané, Núria
This paper models the assessments of a group of experts when evaluating different magnitudes, features or objects by using linguistic descriptions. A new general representation of linguistic descriptions is provided by unifying ordinal and fuzzy perspectives. Fuzzy qualitative labels are proposed as a generalization of the concept of qualitative labels over a wellordered set. A lattice structure is established in the set of fuzzyqualitative labels to enable the introduction of fuzzyqualitative descriptions as Lfuzzy sets. A theorem is given that characterizes finite fuzzy partitions using fuzzyqualitative labels, the cores and supports of which are qualitative labels. This theorem leads to a mathematical justification for commonlyused fuzzy partitions of real intervals via trapezoidal fuzzy sets. The information of a fuzzyqualitative label is defined using a measure of specificity, in order to introduce the entropy of fuzzyqualitative descriptions. (C) 2016 Elsevier Inc. All rights reserved.

Abelian Cayley digraphs with asymptotically large order for any given degree
http://hdl.handle.net/2117/99392
Abelian Cayley digraphs with asymptotically large order for any given degree
Aguiló Gost, Francisco de Asis L.; Fiol Mora, Miquel Àngel; Pérez Mansilla, Sonia
Abelian Cayley digraphs can be constructed by using a generalization to Z(n) of the concept of congruence in Z. Here we use this approach to present a family of such digraphs, which, for every fixed value of the degree, have asymptotically large number of vertices as the diameter increases. Up to now, the best known large dense results were all nonconstructive.
20170117T08:34:07Z
Aguiló Gost, Francisco de Asis L.
Fiol Mora, Miquel Àngel
Pérez Mansilla, Sonia
Abelian Cayley digraphs can be constructed by using a generalization to Z(n) of the concept of congruence in Z. Here we use this approach to present a family of such digraphs, which, for every fixed value of the degree, have asymptotically large number of vertices as the diameter increases. Up to now, the best known large dense results were all nonconstructive.

Nonregularised inverse finite element analysis for 3D traction force microscopy
http://hdl.handle.net/2117/99311
Nonregularised inverse finite element analysis for 3D traction force microscopy
Muñoz Romero, José
The tractions that cells exert on a gel substrate from the observed
displacements is an increasingly attractive and valuable information in
biomedical experiments. The computation of these tractions requires in
general the solution of an inverse problem. Here, we resort to the discretisation
with finite elements of the associated direct variational formulation,
and solve the inverse analysis using a least square approach.
This strategy requires the minimisation of an error functional, which is
usually regularised in order to obtain a stable system of equations with
a unique solution. In this paper we show that for many common threedimensional
geometries, meshes and loading conditions, this regularisation
is unnecessary. In these cases, the computational cost of the inverse
problem becomes equivalent to a direct finite element problem. For the
nonregularised functional, we deduce the necessary and sufficient conditions
that the dimensions of the interpolated displacement and traction
fields must preserve in order to exactly satisfy or yield a unique solution
of the discrete equilibrium equations. We apply the theoretical results to
some illustrative examples and to real experimental data. Due to the relevance
of the results for biologists and modellers, the article concludes with
some practical rules that the finite element discretisation must satisfy.
20170116T12:38:07Z
Muñoz Romero, José
The tractions that cells exert on a gel substrate from the observed
displacements is an increasingly attractive and valuable information in
biomedical experiments. The computation of these tractions requires in
general the solution of an inverse problem. Here, we resort to the discretisation
with finite elements of the associated direct variational formulation,
and solve the inverse analysis using a least square approach.
This strategy requires the minimisation of an error functional, which is
usually regularised in order to obtain a stable system of equations with
a unique solution. In this paper we show that for many common threedimensional
geometries, meshes and loading conditions, this regularisation
is unnecessary. In these cases, the computational cost of the inverse
problem becomes equivalent to a direct finite element problem. For the
nonregularised functional, we deduce the necessary and sufficient conditions
that the dimensions of the interpolated displacement and traction
fields must preserve in order to exactly satisfy or yield a unique solution
of the discrete equilibrium equations. We apply the theoretical results to
some illustrative examples and to real experimental data. Due to the relevance
of the results for biologists and modellers, the article concludes with
some practical rules that the finite element discretisation must satisfy.

Noncommutative integrable systems on bsymplectic manifolds
http://hdl.handle.net/2117/99219
Noncommutative integrable systems on bsymplectic manifolds
Miranda Galcerán, Eva; Kiesenhoferb, Anna
In this paper we study noncommutative integrable systems on bPoisson manifolds. One important source of examples (and motivation) of such systems comes from considering noncommutative systems on manifolds with boundary having the right asymptotics on the boundary. In this paper we describe this and other examples and prove an actionangle theorem for noncommutative integrable systems on a bsymplectic manifold in a neighborhood of a Liouville torus inside the critical set of the Poisson structure associated to the bsymplectic structure.
20170113T12:25:40Z
Miranda Galcerán, Eva
Kiesenhoferb, Anna
In this paper we study noncommutative integrable systems on bPoisson manifolds. One important source of examples (and motivation) of such systems comes from considering noncommutative systems on manifolds with boundary having the right asymptotics on the boundary. In this paper we describe this and other examples and prove an actionangle theorem for noncommutative integrable systems on a bsymplectic manifold in a neighborhood of a Liouville torus inside the critical set of the Poisson structure associated to the bsymplectic structure.

New offsetfree method for model predictive control of open channels
http://hdl.handle.net/2117/98804
New offsetfree method for model predictive control of open channels
Horváth, Klaudia; Galvis, Eduard; Gómez Valentín, Manuel; Rodellar Benedé, José
Irrigation or drainage canals can be controlled by model predictive control (MPC). Applying MPC with an internal model in the presence of unknown disturbances in some cases can lead to steady state offset. Therefore an additional component should be implemented along with the MPC. A new method eliminating the offset has been developed in this paper for MPC. It is based on combining two basic approaches of MPC. It has been implemented to control water levels in the threepool UPC laboratory canal and further numerically tested using a test case benchmark proposed by the American Society of Civil Engineers (ASCE). It has been found that the developed offsetfree method is able to eliminate the steadystate offset, while taking into account known and unknown disturbances.
20161223T15:41:12Z
Horváth, Klaudia
Galvis, Eduard
Gómez Valentín, Manuel
Rodellar Benedé, José
Irrigation or drainage canals can be controlled by model predictive control (MPC). Applying MPC with an internal model in the presence of unknown disturbances in some cases can lead to steady state offset. Therefore an additional component should be implemented along with the MPC. A new method eliminating the offset has been developed in this paper for MPC. It is based on combining two basic approaches of MPC. It has been implemented to control water levels in the threepool UPC laboratory canal and further numerically tested using a test case benchmark proposed by the American Society of Civil Engineers (ASCE). It has been found that the developed offsetfree method is able to eliminate the steadystate offset, while taking into account known and unknown disturbances.