Ponències/Comunicacions de congressos
http://hdl.handle.net/2117/3920
2018-01-17T20:33:04ZA boundary control technique to the string-tip-mass system based on a non-symmetric peak-detector model
http://hdl.handle.net/2117/112365
A boundary control technique to the string-tip-mass system based on a non-symmetric peak-detector model
Acho Zuppa, Leonardo; Pujol Vázquez, Gisela
This paper presents a vibration control design to
the string-tip-mass system by using a non-symmetric peakdetector
mechanism. Previously, this peak-detector system was
used as an easy algorithm to mitigate vibration on a real flexible
structure. Moreover, its mathematical representation is simple
and it just has two parameters to tune. Following this former
experience, we adequate this strategy to the vibration control
of the string-tip-mass system. Finally, and according to our
numerical experiments, our control performance is better than
the boundary damper control here programmed for comparison
proposes.
2017-12-22T07:46:58ZAcho Zuppa, LeonardoPujol Vázquez, GiselaThis paper presents a vibration control design to
the string-tip-mass system by using a non-symmetric peakdetector
mechanism. Previously, this peak-detector system was
used as an easy algorithm to mitigate vibration on a real flexible
structure. Moreover, its mathematical representation is simple
and it just has two parameters to tune. Following this former
experience, we adequate this strategy to the vibration control
of the string-tip-mass system. Finally, and according to our
numerical experiments, our control performance is better than
the boundary damper control here programmed for comparison
proposes.Adaptive predictive control of a base-isolated hysteretic system
http://hdl.handle.net/2117/112364
Adaptive predictive control of a base-isolated hysteretic system
Ponce de León Puig, Nubia Ilia; Acho Zuppa, Leonardo; Rodellar Benedé, José
This article proposes an adaptive predictive control
design technique to mitigate the displacement in a hysteretical
base-isolated system seismically perturbed. The obtained predictive
control law is based on the measurable linear part of the
base-isolated model, and programmed over a prediction-time of
one-sampling-discrete-time period. Two main contributions are
highlighted. First, we use a delta-modulator with hysteresis to
avoid the zero-crossing in the control law caused by one estimated
parameters. Second, we implement a dynamic hysteretic model
based on relays as a command governor able to create new
hysteretic reference trajectories. This is realized to robustly
compensate the hysteretic behavior of the structure under control.
Finally, and according to numerical experiments, our control
design presents a good performance from the displacement
control point of view in comparison to the open-loop system
response, where the El Centro earthquake is invoked.
2017-12-22T07:14:52ZPonce de León Puig, Nubia IliaAcho Zuppa, LeonardoRodellar Benedé, JoséThis article proposes an adaptive predictive control
design technique to mitigate the displacement in a hysteretical
base-isolated system seismically perturbed. The obtained predictive
control law is based on the measurable linear part of the
base-isolated model, and programmed over a prediction-time of
one-sampling-discrete-time period. Two main contributions are
highlighted. First, we use a delta-modulator with hysteresis to
avoid the zero-crossing in the control law caused by one estimated
parameters. Second, we implement a dynamic hysteretic model
based on relays as a command governor able to create new
hysteretic reference trajectories. This is realized to robustly
compensate the hysteretic behavior of the structure under control.
Finally, and according to numerical experiments, our control
design presents a good performance from the displacement
control point of view in comparison to the open-loop system
response, where the El Centro earthquake is invoked.La matemática pura en los cursos militares de matemáticas de Pedro Lucuce (1739-44) y de Pedro Padilla (1753-56)
http://hdl.handle.net/2117/111695
La matemática pura en los cursos militares de matemáticas de Pedro Lucuce (1739-44) y de Pedro Padilla (1753-56)
Blanco Abellán, Mónica; Massa Esteve, Maria Rosa
Aritmetica y geometria
2017-12-11T13:15:38ZBlanco Abellán, MónicaMassa Esteve, Maria RosaAritmetica y geometriaCharacterizing path-like trees from linear configurations
http://hdl.handle.net/2117/111640
Characterizing path-like trees from linear configurations
López Masip, Susana Clara
Assume that we embed the path Pn as a subgraph of a 2-dimensional grid, namely, Pk¿Pl.
Given such an embedding, we consider the ordered set of subpaths L1, L2,...,Lm which are maximal straight segments in the embedding, and such that the end of Li is the beginning of Li+1.
2017-12-11T09:01:44ZLópez Masip, Susana ClaraAssume that we embed the path Pn as a subgraph of a 2-dimensional grid, namely, Pk¿Pl.
Given such an embedding, we consider the ordered set of subpaths L1, L2,...,Lm which are maximal straight segments in the embedding, and such that the end of Li is the beginning of Li+1.Physically based skeleton tracking
http://hdl.handle.net/2117/111547
Physically based skeleton tracking
López Gandía, Axel Javier; Susín Sánchez, Antonio
Skeleton tracking has multiple applications such as games, virtual reality, motion capture and more. One of the main challenges of pose detection is to be able to obtain the best possible quality with a cheap and easy-to-use device. In this work we propose a physically based method to detect errors and tracking issues which appear when we use low cost tracking devices such as Kinect. Therefore, we can correct the animation in order to obtain a smoother movement. We have implemented the Newton- Euler Algorithm, which allow us to compute the internal forces involved in a skeleton. In a common movement, forces are usually smooth without sudden variations. When the tracking yields poor results or invalid poses the internal forces become very large with a lot of variation. This allow us to detect when the tracking system fails and the animation needs to be inferred through different methods.
2017-12-05T09:07:09ZLópez Gandía, Axel JavierSusín Sánchez, AntonioSkeleton tracking has multiple applications such as games, virtual reality, motion capture and more. One of the main challenges of pose detection is to be able to obtain the best possible quality with a cheap and easy-to-use device. In this work we propose a physically based method to detect errors and tracking issues which appear when we use low cost tracking devices such as Kinect. Therefore, we can correct the animation in order to obtain a smoother movement. We have implemented the Newton- Euler Algorithm, which allow us to compute the internal forces involved in a skeleton. In a common movement, forces are usually smooth without sudden variations. When the tracking yields poor results or invalid poses the internal forces become very large with a lot of variation. This allow us to detect when the tracking system fails and the animation needs to be inferred through different methods.Isolated cycles of critical random graphs
http://hdl.handle.net/2117/111536
Isolated cycles of critical random graphs
Noy Serrano, Marcos; Rasendrahasina, Vonjy; Ravelomanana, Vlady; Rué Perna, Juan José
Consider the Erdos-Renyi random graph G(n, M) built with n vertices and
M edges uniformly randomly chosen from the set of n2 edges. Let L be a set of positive integers. For any number of edges M 6n/2 + O(n 2/3 ), we compute – via analytic combinatorics – the number of isolated cycles of G(n, M) whose length is in L.
2017-12-04T12:51:16ZNoy Serrano, MarcosRasendrahasina, VonjyRavelomanana, VladyRué Perna, Juan JoséConsider the Erdos-Renyi random graph G(n, M) built with n vertices and
M edges uniformly randomly chosen from the set of n2 edges. Let L be a set of positive integers. For any number of edges M 6n/2 + O(n 2/3 ), we compute – via analytic combinatorics – the number of isolated cycles of G(n, M) whose length is in L.Características de la siniestralidad laboral del sector minero español de productos de cantera y rocas ornamentales en los períodos 2003-2008 y 2009-2014
http://hdl.handle.net/2117/110821
Características de la siniestralidad laboral del sector minero español de productos de cantera y rocas ornamentales en los períodos 2003-2008 y 2009-2014
Sanmiquel Pera, Lluís; Bascompta Massanes, Marc; Anticoi Sudzuki, Hernán Francisco; Rossell Garriga, Josep Maria; Freijo Álvarez, Modesto
2017-11-17T10:34:15ZSanmiquel Pera, LluísBascompta Massanes, MarcAnticoi Sudzuki, Hernán FranciscoRossell Garriga, Josep MariaFreijo Álvarez, ModestoCombined heat and power using high temperature proton exchange membrane fuel cells for comfort applications
http://hdl.handle.net/2117/110267
Combined heat and power using high temperature proton exchange membrane fuel cells for comfort applications
Sanz i López, Víctor; Costa Castelló, Ramon; Batlle Arnau, Carles
Global concerns about nowadays’ energy shortage problems as well as climate change eects have encouraged alternatives to classical energy sources such as fossil fuels and nuclear power plants. In this context, combined heat and power is presented as a useful option due to its ability of generating both electrical and thermal energy more eciently than conventional methods. Regarding this, high temperature proton exchange membrane fuel cells are not only a reliable way of implementing combined heat and power systems, but also a better solution in terms of energy conversion eciency and greenhouse gases emissions reduction. Therefore, high temperature proton exchange membrane fuel cells are being installed around the world and policies encouraging its utilisation are being promoted.
2017-11-10T13:00:50ZSanz i López, VíctorCosta Castelló, RamonBatlle Arnau, CarlesGlobal concerns about nowadays’ energy shortage problems as well as climate change eects have encouraged alternatives to classical energy sources such as fossil fuels and nuclear power plants. In this context, combined heat and power is presented as a useful option due to its ability of generating both electrical and thermal energy more eciently than conventional methods. Regarding this, high temperature proton exchange membrane fuel cells are not only a reliable way of implementing combined heat and power systems, but also a better solution in terms of energy conversion eciency and greenhouse gases emissions reduction. Therefore, high temperature proton exchange membrane fuel cells are being installed around the world and policies encouraging its utilisation are being promoted.Linear hamiltonian control systems. An approach under linear algebra point of view
http://hdl.handle.net/2117/110146
Linear hamiltonian control systems. An approach under linear algebra point of view
García Planas, María Isabel; Chanes Espigares, Antonio
Hamiltonian systems model a number of important problems in theoretical physics, mechanics, fluid dynamics and others disciplines. Many important physical and engineering processes can be described by a suitable linear Hamiltonian formalism. The properties of Hamiltonian systems like conservation of energy or volume in the phase space leads specific dynamical features. This paper approaches the study, analysis and characterization of linear Hamiltonian systems through the linear algebra
2017-11-08T12:33:28ZGarcía Planas, María IsabelChanes Espigares, AntonioHamiltonian systems model a number of important problems in theoretical physics, mechanics, fluid dynamics and others disciplines. Many important physical and engineering processes can be described by a suitable linear Hamiltonian formalism. The properties of Hamiltonian systems like conservation of energy or volume in the phase space leads specific dynamical features. This paper approaches the study, analysis and characterization of linear Hamiltonian systems through the linear algebraTriangular matrices and combinatorial recurrences
http://hdl.handle.net/2117/109153
Triangular matrices and combinatorial recurrences
Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, M. Jose
2017-10-25T12:18:33ZEncinas Bachiller, Andrés MarcosJiménez Jiménez, M. Jose