Ponències/Comunicacions de congressos
http://hdl.handle.net/2117/3920
2016-08-30T17:24:25ZEnseñanza basada en proyectos: una forma alternativa para enseñar Álgebra Lineal
http://hdl.handle.net/2117/89250
Enseñanza basada en proyectos: una forma alternativa para enseñar Álgebra Lineal
Taberna Torres, Judit; García Planas, María Isabel
Con e fin de promover el compromiso y la motivación de los estudiantes de ingeniería en la asignatura de álgebra lineal, hemos propuesto un aprendizaje basado en proyectos, dando un enfoque de clase dináamica en la que los estudiantes modelan problemas del mundo real con el fin de obtener un conocimiento más profundo de la materia. Teniendo en cuenta que la mayoría de los estudiantes son nativos digitales, utilizamos el e-portafolio como herramienta de comunicación entre los estudiantes y el maestro-alumno. En este artículo, presentamos una visión general del diseño y la implementación de un aprendizaje basado en proyectos para un curso de áalgebra lineal enseñado en la "ETSEIB" de la Universitat Politècnica de Catalunya (UPC)
2016-07-27T09:48:39ZTaberna Torres, JuditGarcía Planas, María IsabelCon e fin de promover el compromiso y la motivación de los estudiantes de ingeniería en la asignatura de álgebra lineal, hemos propuesto un aprendizaje basado en proyectos, dando un enfoque de clase dináamica en la que los estudiantes modelan problemas del mundo real con el fin de obtener un conocimiento más profundo de la materia. Teniendo en cuenta que la mayoría de los estudiantes son nativos digitales, utilizamos el e-portafolio como herramienta de comunicación entre los estudiantes y el maestro-alumno. En este artículo, presentamos una visión general del diseño y la implementación de un aprendizaje basado en proyectos para un curso de áalgebra lineal enseñado en la "ETSEIB" de la Universitat Politècnica de Catalunya (UPC)Sliding mode control of a voltage source inverter with switching frequency regulation
http://hdl.handle.net/2117/89099
Sliding mode control of a voltage source inverter with switching frequency regulation
Repecho del Corral, Víctor; Biel Solé, Domingo; Olm Miras, Josep Maria; Fossas Colet, Enric
This work presents the study of a switching frequency regulation of a sliding mode control under tracking control scheme. A variable hysteresis band with an additional control loop is proposed and the equivalent system is developed in order to analyse the stability. Sufficient stability conditions are found for the resulting discrete-time, time varying system, using a feed forward term. The technique is applied to a voltage source inverter tracking a time varying voltage reference. Simulation results are presented in order to confirm the goodness of the switching frequency control loop
2016-07-25T06:27:51ZRepecho del Corral, VíctorBiel Solé, DomingoOlm Miras, Josep MariaFossas Colet, EnricThis work presents the study of a switching frequency regulation of a sliding mode control under tracking control scheme. A variable hysteresis band with an additional control loop is proposed and the equivalent system is developed in order to analyse the stability. Sufficient stability conditions are found for the resulting discrete-time, time varying system, using a feed forward term. The technique is applied to a voltage source inverter tracking a time varying voltage reference. Simulation results are presented in order to confirm the goodness of the switching frequency control loopDevelopment of air quality indexes using compositional approach
http://hdl.handle.net/2117/89090
Development of air quality indexes using compositional approach
Jarauta Bragulat, Eusebio; Egozcue, Juan José; Hervada Sala, Carme; Gibergans Baguena, José
A compositional approach to air quality index (AQI) based on a log-contrast of pollutants over non-polluted air fraction was recently developed. This approach let to three open questions about consistency and formalization of such index. First question is to find out the conditions under which the approximation of the log-contrast by the logarithm of the geometric mean of pollutants concentrations, are reliable. Second, is to examine a way to define a reasonable scale for express air quality, taking into account the effects of air pollution on population health and on social or economic activity. The third one is to find out the properties of this kind of index with respect to the addition of a new set of air pollutants in the composition. To deal with these open questions, a decision making tree should be designed in order to select suitable weights on the air pollutants. A preliminary application study of air pollutants composition distribution in some cities is presented. In addition, the approach of the log-contrast by the logarithm of the weighted geometric mean is described for these cities.
2016-07-22T13:06:11ZJarauta Bragulat, EusebioEgozcue, Juan JoséHervada Sala, CarmeGibergans Baguena, JoséA compositional approach to air quality index (AQI) based on a log-contrast of pollutants over non-polluted air fraction was recently developed. This approach let to three open questions about consistency and formalization of such index. First question is to find out the conditions under which the approximation of the log-contrast by the logarithm of the geometric mean of pollutants concentrations, are reliable. Second, is to examine a way to define a reasonable scale for express air quality, taking into account the effects of air pollution on population health and on social or economic activity. The third one is to find out the properties of this kind of index with respect to the addition of a new set of air pollutants in the composition. To deal with these open questions, a decision making tree should be designed in order to select suitable weights on the air pollutants. A preliminary application study of air pollutants composition distribution in some cities is presented. In addition, the approach of the log-contrast by the logarithm of the weighted geometric mean is described for these cities.Wind model for offshore power simulation
http://hdl.handle.net/2117/89089
Wind model for offshore power simulation
Hervada Sala, Carme; Jarauta Bragulat, Eusebio; Gibergans Baguena, José; Buenestado Caballero, Pablo
Offshore wind energy is an alternative energy source of increased interest. A large offshore wind farms have been planned or under construction, mainly in northern Europe. One of the points needed to be able to implement offshore projects is to characterize and model the wind for marine generation. Models are needed for the design of the most appropriate control strategies. Some attempts have been done to do so; recently these models are implemented under a wind turbine block set in Matlab/Simulink. A handicap has been detected: adjustment of wind turbulence using a white noise function. In this paper, a modification of that model is presented, based on real data and a wind model block in Matlab/Simulink has been performed to implement a new noise function with better results than the standard white noise function.
2016-07-22T12:59:09ZHervada Sala, CarmeJarauta Bragulat, EusebioGibergans Baguena, JoséBuenestado Caballero, PabloOffshore wind energy is an alternative energy source of increased interest. A large offshore wind farms have been planned or under construction, mainly in northern Europe. One of the points needed to be able to implement offshore projects is to characterize and model the wind for marine generation. Models are needed for the design of the most appropriate control strategies. Some attempts have been done to do so; recently these models are implemented under a wind turbine block set in Matlab/Simulink. A handicap has been detected: adjustment of wind turbulence using a white noise function. In this paper, a modification of that model is presented, based on real data and a wind model block in Matlab/Simulink has been performed to implement a new noise function with better results than the standard white noise function.Advanced design of integrated vibration control systems for adjacent buildings under seismic excitations
http://hdl.handle.net/2117/89086
Advanced design of integrated vibration control systems for adjacent buildings under seismic excitations
Palacios Quiñonero, Francisco; Rubió Massegú, Josep; Rossell Garriga, Josep Maria; Karimi, Hamid Reza
In vibration control of adjacent buildings under seismic excitations, a twofold objective has to be considered: (i) to mitigate the vibrational response of the individual structures and (ii) to provide a suitable protection against interbuilding impacts (pounding). An interesting strategy to deal with this complex control problem consists in considering an integrated control system, which combines interbuilding actuation devices with local control systems implemented in the individual buildings. In this paper, an effective computational strategy to design this kind of integrated control systems is presented. The proposed design methodology is based on a linear matrix inequality formulation, allows including active and passive actuation devices, and makes it possible to deal with important information constraints associated to the problem. The main ideas are illustrated by means of a twobuilding systemequipped with three actuation devices: two interstory actuation devices implemented at the ground level of the buildings, plus an interbuilding actuation device installed at the top level of the lowest building. For this control setup, two different integrated controllers are designed. A proper set of numerical simulations is
conducted to assess the performance of the proposed controllers with positive results.
2016-07-22T11:37:41ZPalacios Quiñonero, FranciscoRubió Massegú, JosepRossell Garriga, Josep MariaKarimi, Hamid RezaIn vibration control of adjacent buildings under seismic excitations, a twofold objective has to be considered: (i) to mitigate the vibrational response of the individual structures and (ii) to provide a suitable protection against interbuilding impacts (pounding). An interesting strategy to deal with this complex control problem consists in considering an integrated control system, which combines interbuilding actuation devices with local control systems implemented in the individual buildings. In this paper, an effective computational strategy to design this kind of integrated control systems is presented. The proposed design methodology is based on a linear matrix inequality formulation, allows including active and passive actuation devices, and makes it possible to deal with important information constraints associated to the problem. The main ideas are illustrated by means of a twobuilding systemequipped with three actuation devices: two interstory actuation devices implemented at the ground level of the buildings, plus an interbuilding actuation device installed at the top level of the lowest building. For this control setup, two different integrated controllers are designed. A proper set of numerical simulations is
conducted to assess the performance of the proposed controllers with positive results.An educational example to the maximum power transfer objective in electric circuits using a PD-controlled DC- driver
http://hdl.handle.net/2117/88972
An educational example to the maximum power transfer objective in electric circuits using a PD-controlled DC- driver
Acho Zuppa, Leonardo
The main objective of this paper is to present an academic example of a PD
controller applied to teach position control design of a DC-motor to automatically adjust a
potentiometer. This adjustment is focused on to solve the maximum power transfer objective
in a linear electrical circuit. This design involves the use of the extremum seeking algorithm. To
support our proposal, numerical simulations and mathematical modelling of the main problem
statement are programmed.
2016-07-20T12:13:22ZAcho Zuppa, LeonardoThe main objective of this paper is to present an academic example of a PD
controller applied to teach position control design of a DC-motor to automatically adjust a
potentiometer. This adjustment is focused on to solve the maximum power transfer objective
in a linear electrical circuit. This design involves the use of the extremum seeking algorithm. To
support our proposal, numerical simulations and mathematical modelling of the main problem
statement are programmed.Super-twisting controllers for wind turbines
http://hdl.handle.net/2117/88829
Super-twisting controllers for wind turbines
Tutivén Gálvez, Christian; Vidal Seguí, Yolanda; Acho Zuppa, Leonardo; Rodellar Benedé, José
The main contribution of this paper is to propose new control techniques which not only provide fault tolerance capabilities to the WT system, but also improve the overall performance of the system in both fault free and faulty conditions. Coupled non-linear aero-hydro-servo-elastic simulations of an offshore wind turbine with jacket platform are carried out. The proposed controllers are based in the super-twisting algorithm (STA) by using feedback of the generator shaft speed as well as the fore-aft and side-to-side acceleration signals of the WT tower.
2016-07-15T12:11:21ZTutivén Gálvez, ChristianVidal Seguí, YolandaAcho Zuppa, LeonardoRodellar Benedé, JoséThe main contribution of this paper is to propose new control techniques which not only provide fault tolerance capabilities to the WT system, but also improve the overall performance of the system in both fault free and faulty conditions. Coupled non-linear aero-hydro-servo-elastic simulations of an offshore wind turbine with jacket platform are carried out. The proposed controllers are based in the super-twisting algorithm (STA) by using feedback of the generator shaft speed as well as the fore-aft and side-to-side acceleration signals of the WT tower.Variable structure strategy to avoid torque control saturation of a wind turbine in the presence of faults
http://hdl.handle.net/2117/88827
Variable structure strategy to avoid torque control saturation of a wind turbine in the presence of faults
Tutivén Gálvez, Christian; Vidal Seguí, Yolanda; Acho Zuppa, Leonardo; Rodellar Benedé, José
Every physical actuator is subject to saturation. It has been well recognized that, when the actuator saturates, the performance of the closed-loop system (designed without considering actuator saturation) may seriously deteriorate. In extreme cases, the system stability may even be lost. This paper proposes an avoid saturation strategy for the torque controller of a wind turbine benchmark model. The simulation results show that the proposed strategy has a clear added value with respect to the baseline controller (well- accepted industrial controller) in the presence of faults. Another advantage of the contributed method is that conservative bounds for the actuator torque can be fixed in order to extend the service life of the wind turbine.
2016-07-15T12:05:27ZTutivén Gálvez, ChristianVidal Seguí, YolandaAcho Zuppa, LeonardoRodellar Benedé, JoséEvery physical actuator is subject to saturation. It has been well recognized that, when the actuator saturates, the performance of the closed-loop system (designed without considering actuator saturation) may seriously deteriorate. In extreme cases, the system stability may even be lost. This paper proposes an avoid saturation strategy for the torque controller of a wind turbine benchmark model. The simulation results show that the proposed strategy has a clear added value with respect to the baseline controller (well- accepted industrial controller) in the presence of faults. Another advantage of the contributed method is that conservative bounds for the actuator torque can be fixed in order to extend the service life of the wind turbine.CSI algorithm: ‘Canal Survey Estimation’ to estimate the flow rate extracted from irrigation canals
http://hdl.handle.net/2117/88757
CSI algorithm: ‘Canal Survey Estimation’ to estimate the flow rate extracted from irrigation canals
Soler Guitart, Joan; Bonet Gil, Enrique; Gómez Valentín, Manuel; Rodellar Benedé, José
The management of the water resources in a canal can be disturbed by the users, if the demand deliveries have been increased because a farmer obtained a greater flow than the scheduled delivery, the watermaster does not know the reason why the water level decreases at the target points, but the watermaster can know this information because CSI can obtain the unknown flow withdrawn by the farmer. On the other hand, if farmer pumps water from an unknown point in the canal, CSI can obtain the approximate location
of this point and the volume of water withdrawn by the farmer. CSI can also define the hydrodynamic state of a canal during a predictive horizon which is very useful in any case, because the hydrodynamic state of a canal is defined from the velocity and water level in each cross-section of the canal. In short, CSI algorithmcan be a useful tool in the management of a canal.
2016-07-13T17:05:52ZSoler Guitart, JoanBonet Gil, EnriqueGómez Valentín, ManuelRodellar Benedé, JoséThe management of the water resources in a canal can be disturbed by the users, if the demand deliveries have been increased because a farmer obtained a greater flow than the scheduled delivery, the watermaster does not know the reason why the water level decreases at the target points, but the watermaster can know this information because CSI can obtain the unknown flow withdrawn by the farmer. On the other hand, if farmer pumps water from an unknown point in the canal, CSI can obtain the approximate location
of this point and the volume of water withdrawn by the farmer. CSI can also define the hydrodynamic state of a canal during a predictive horizon which is very useful in any case, because the hydrodynamic state of a canal is defined from the velocity and water level in each cross-section of the canal. In short, CSI algorithmcan be a useful tool in the management of a canal.Tracking control for a Stewart platform prototype
http://hdl.handle.net/2117/87734
Tracking control for a Stewart platform prototype
Rossell Garriga, Josep Maria; Palacios Quiñonero, Francisco; Rubió Massegú, Josep; Vicente Rodrigo, Jesús
A Stewart platform is a well-known mechanism which can be used for a wide variety of vibration control problems. In this paper, an LQR controller for a Stewart platform prototype is proposed which, combined with a proportional derivative gain matrix, achieves a good performance when compared with the classical PID control system. By testing some
trajectories, we observe that the tracking error between the actual and pre-established trajectories is smaller by applying the controller supplied in this work. The final purpose will be the implementation of this kind of control in a real Stewart platform constructed at the Universitat Polit`ecnica de Catalunya (UPC) by our research group.
2016-06-06T14:26:23ZRossell Garriga, Josep MariaPalacios Quiñonero, FranciscoRubió Massegú, JosepVicente Rodrigo, JesúsA Stewart platform is a well-known mechanism which can be used for a wide variety of vibration control problems. In this paper, an LQR controller for a Stewart platform prototype is proposed which, combined with a proportional derivative gain matrix, achieves a good performance when compared with the classical PID control system. By testing some
trajectories, we observe that the tracking error between the actual and pre-established trajectories is smaller by applying the controller supplied in this work. The final purpose will be the implementation of this kind of control in a real Stewart platform constructed at the Universitat Polit`ecnica de Catalunya (UPC) by our research group.