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1 to 50 of 580 results
  • Leak localization in water networks: a model-based methodology using pressure sensors applied to a real network in Barcelona

     Pérez Magrané, Ramon; Sanz Estapé, Gerard; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Cuguero Escofet, Miquel Àngel; Nejjari Akhi-elarab, Fatiha; Meseguer, Jordi; Cembrano Gennari, M.gabriela Elena; Mirats Tur, Josep Maria; Sarrate Estruch, Ramon
    IEEE control systems magazine
    Date of publication: 2014-08-01
    Journal article

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    The efficient distribution of water is a subject of major concern for water utilities and authorities [1]. While some leaks in water distribution networks (WDNs) are unavoidable, one of the main challenges in improving the efficiency of drinking water networks is to minimize leaks. Leaks can cause significant economic losses in fluid transportation and extra costs for the final consumer due to the waste of energy and chemicals in water treatment plants. Leaks may also damage infrastructure and cause third-party damage and health risks. In many WDNs, losses due to leakage are estimated to account up to 30% of the total amount of extracted water [2]; a very important issue in a world struggling to satisfy water demands of a growing population.

    The efficient distribution of water is a subject of major concern for water utilities and authorities [1]. While some leaks in water distribution networks (WDNs) are unavoidable, one of the main challenges in improving the efficiency of drinking water networks is to minimize leaks. Leaks can cause significant economic losses in fluid transportation and extra costs for the final consumer due to the waste of energy and chemicals in water treatment plants. Leaks may also damage infrastructure and cause third-party damage and health risks. In many WDNs, losses due to leakage are estimated to account up to 30% of the total amount of extracted water [2]; a very important issue in a world struggling to satisfy water demands of a growing population.

  • Flowmeter data validation and reconstruction methodology to provide the annual efficiency of a water transport network: the ATLL case study in Catalonia

     Quevedo Casin, Joseba-jokin; Pascual Pañach, Josep; Puig Cayuela, Vicenç; Saludes Closa, Jordi; Sarrate Estruch, Ramon; Escobet Canal, Antoni; Espin, Santiago; Roquet, Jaume
    Water science and technology: water supply
    Date of publication: 2014-03
    Journal article

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    The object of this paper is to provide a flowmeter data validation/reconstruction methodology that determines the annual economic efficiency of a water transport network. In this paper, the case of Aigües Ter Llobregat (ATLL) company, which manages 80% of the overall water transport network in Catalonia (Spain), will be used for illustrating purposes. Economic network efficiency is based on daily data set collected by the company using about 200 flowmeters of the network. Data collected using these sensors are used by remote control and information storage systems and they are stored in a relational database. All information provided by ATLL is analysed to detect inconsistent data using an automatic data validation method deployed in parallel with the network efficiency evaluation. As a result of the validation process, corrections of flow measurements and of billed water volume are introduced. Results from ATLL water transport network corresponding to year 2010 will be used to illustrate the approach proposed in this paper.

  • Combining learning in model space fault diagnosis with data validation/reconstruction: Application to the Barcelona water network

     Quevedo Casin, Joseba-jokin; Chen, Heran; Cuguero Escofet, Miquel Àngel; Tino, Peter; Puig Cayuela, Vicenç; Garcia Valverde, Diego; Sarrate Estruch, Ramon; Yao, Xin
    Engineering applications of artificial intelligence
    Date of publication: 2014-02-14
    Journal article

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    In this paper, an integrated data validation/reconstruction and fault diagnosis approach is proposed for critical infrastructure systems. The proposed methodology is implemented in a two-stage approach. In the first stage, sensor communication faults are detected and corrected, in order to facilitate a reliable dataset to perform system fault diagnosis in the second stage. On the one hand, sensor validation and reconstruction are based on the combined use of spatial and time series models. Spatial models take advantage of the (mass-balance) relation between different variables in the system, whilst time series models take advantage of the temporal redundancy of the measured variables by means of Holt-Winters time series models. On the other hand, fault diagnosis is based on the learning-in-model-space approach that is implemented by fitting a series of models using a series of signal segments selected with a sliding window. In this way, each signal segment can be represented by one model. To rigorously measure the `distance¿ between models, the distance in the model space is defined. The deterministic reservoir computing approach is used to approximate a model with the input¿output dynamics that exploits spatial¿temporal correlations existing in the original data. Finally, the proposed approach is successfully applied to the Barcelona water network.

  • Chlorine decay model calibration and comparison: application to a real water network

     Nejjari Akhi-elarab, Fatiha; Puig Cayuela, Vicenç; Pérez Magrané, Ramon; Quevedo Casin, Joseba-jokin; Cuguero Escofet, Miquel Àngel; Sanz Estapé, Gerard; Mirats Tur, Josep Maria
    Computing and Control for the Water Industry
    Presentation's date: 2014-09-03
    Presentation of work at congresses

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    This work presents a methodology to efficiently calibrate chlorine decay models. The calibration consists in estimating the unknown parameters by comparing the measured and simulated chlorine concentrations at the monitored nodes within the distribution system in a least square sense using a normalized quadratic cost function. Since this function involves a non- explicit expression of the model, a genetic algorithm (GA) is applied to optimize the model parameters by minimizing the difference between the model-predicted values and the field-measured ones. The method is applied to a part of the Barcelona drinking water network.

    This work presents a methodology to efficiently calibrate chlorine decay models. The calibration consists in estimating the unknown parameters by comparing the measured and simulated chlorine concentrations at the monitored nodes within the distribution system in a least square sense using a normalized quadratic cost function. Since this function involves a non- explicit expression of the model, a genetic algorithm (GA) is applied to optimize the model parameters by minimizing the difference between the model-predicted values and the field-measured ones. The method is applied to a part of the Barcelona drinking water network.

  • Memorias de la Automática

     Quevedo Casin, Joseba-jokin
    Revista iberoamericana de automática e informática industrial
    Date of publication: 2013
    Journal article

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  • Flooding management using hybrid model predictive control: Application to the Spanish Ebro River

     Romera Formiguera, Juli; Ocampo Martinez, Carlos A.; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin
    Journal of hydroinformatics
    Date of publication: 2013
    Journal article

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    In this paper, the problem of flooding management using hybrid model predictive control is presented and applied to the Ebro River in Spain. The Ebro River presents flooding episodes in the city of Zaragoza during spring when snow melts in the Pyrenees. To avoid flooding in populated areas, some land outside the city is prepared for flooding. This paper presents a control approach to determine and fix the level of flooding in pre-established zones by controlling side gates that determine the water input to the land to be flooded. Finally, several scenarios are used to validate the performance of the proposed approach

  • Fuell cells advanced control and applications

     Quevedo Casin, Joseba-jokin
    Date: 2013-10-28
    Report

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  • Aplicación de la técnica de la QFT para el control activo de las perturbaciones mecánicas en un interferómetro óptico

     Comasolivas Font, Ramon; Escobet Canal, Teresa; Quevedo Casin, Joseba-jokin
    Segunda conferencia iberoamericana en sistemas, cibernética e informática
    Presentation's date: 2013-07-31
    Presentation of work at congresses

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  • Disseny automàtic de controladors robustos basat en QFT: aplicació a l'atenuació de vibracions en interferòmetres

     Comasolivas Font, Ramon; Quevedo Casin, Joseba-jokin; Puig Cayuela, Vicenç; Escobet Canal, Teresa
    Jornades de Recerca en Automàtica, Visió i Robòtica
    Presentation's date: 2013-07-04
    Presentation of work at congresses

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  • Robot 2013: 1a Conferencia Ibérica sobre Robótica

     Quevedo Casin, Joseba-jokin
    Automática e instrumentación
    Date of publication: 2013-12-01
    Journal article

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  • XXXIV Jornadas de Automática. Un importante punto de encuentro para profesionales, empresas e investigadores

     Quevedo Casin, Joseba-jokin
    Automática e instrumentación
    Date of publication: 2013-10-01
    Journal article

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  • Application of predictive control strategies to the management of complex networks in the urban water cycle

     Ocampo Martinez, Carlos A.; Puig Cayuela, Vicenç; Cembrano Gennari, M.gabriela Elena; Quevedo Casin, Joseba-jokin
    IEEE control systems magazine
    Date of publication: 2013
    Journal article

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  • Temporal/spatial model-based fault diagnosis vs. hidden Markov models change detection method: application to the Barcelona water network

     Quevedo Casin, Joseba-jokin; Alippi, Cesare; Cuguero Escofet, Miquel Àngel; Ntalampiras, Stavros; Puig Cayuela, Vicenç; Roveri, Manuel; Garcia Valverde, Diego
    Mediterranean Conference on Control & Automation
    Presentation's date: 2013-06-26
    Presentation of work at congresses

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  • Automatic control of pollutant on a shallow river using surface water systems: application to the Ebro river

     Puig Cayuela, Vicenç; Romera Formiguera, Juli; Quevedo Casin, Joseba-jokin; Morales Hernández, Mario; González Sanchis, M.; Garcia Navarro, María del Pilar
    IWA conference  on Instrumentation, Control and Automation
    Presentation's date: 2013-09-18
    Presentation of work at congresses

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  • Sensor placement for leak detection and location in water distribution networks

     Sarrate Estruch, Ramon; Blesa Izquierdo, Joaquin; Nejjari Akhi-elarab, Fatiha; Quevedo Casin, Joseba-jokin
    IWA Specialist Conference on Efficient Use and Management of Water "Water Efficiency Strategies for Difficult Times"
    Presentation's date: 2013-10-23
    Presentation of work at congresses

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  • Multiple fault detection and diagnosis in a gas turbine using nonlinear principal component analysis and structured residuals

     Rincon-Charris, Amilcar; Quevedo Casin, Joseba-jokin
    ASME International Mechanical Engineering Congress & Exposition
    Presentation's date: 2013-11-20
    Presentation of work at congresses

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    Multiple fault detection and diagnosis is a challenging problem because the number of candidates grows exponentially in the number of faults. In add ition, multiple faults in dynamic systems may be hard to detect, because they can mask or compensate each other¿s effects. This paper presents the study of the detection and diagnosis of multiple faults in a SR-30 Gas Turbine using nonlinear principal component analys is as the detection method and structured residuals as th e diagnosis method. The study includes developing a mathematical model, software simulation with Matlab Simulink and implementation of algorithms for detection and diagnosis of multiple faults in the system using nonlinear pri ncipal component analysis and structured residuals. A real SR-30 gas turbine was used for our studies. The equipment is at the moment installed in the Inter American University of Puerto Rico, Ba yamon Campus, and Department of Mechanical Engineering

    Multiple fault detection and diagnosis is a challenging problem because the number of candidates grows exponentially in the number of faults. In add ition, multiple faults in dynamic systems may be hard to detect, because they can mask or compensate each other’s effects. This paper presents the study of the detection and diagnosis of multiple faults in a SR-30 Gas Turbine using nonlinear principal component analys is as the detection method and structured residuals as th e diagnosis method. The study includes developing a mathematical model, software simulation with Matlab Simulink and implementation of algorithms for detection and diagnosis of multiple faults in the system using nonlinear pri ncipal component analysis and structured residuals. A real SR-30 gas turbine was used for our studies. The equipment is at the moment installed in the Inter American University of Puerto Rico, Ba yamon Campus, and Department of Mechanical Engineering

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    Chlorine decay model calibration and comparison: application to a real water network  Open access

     Nejjari Akhi-elarab, Fatiha; Puig Cayuela, Vicenç; Pérez Magrané, Ramon; Quevedo Casin, Joseba-jokin; Cuguero Escofet, Miquel Àngel; Sanz Estapé, Gerard; Mirats Tur, Josep Maria
    Computing and Control for the Water Industry
    Presentation's date: 2013-09-03
    Presentation of work at congresses

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    This work presents a methodology to efficiently calibrate chlorine decay models. The calibration consists in estimating the unknown parameters by comparing the measured and simulated chlorine concentrations at the monitored nodes within the distribution system in a least square sense using a normalized quadratic cost function. Since this function involves a non- explicit expression of the model, a genetic algorithm (GA) is applied to optimize the model parameters by minimizing the difference between the model-predicted values and the field-measured ones. The method is applied to a part of the Barcelona drinking water network.

    This work presents a methodology to efficiently calibrate chlorine decay models. The calibration consists in estimating the unknown parameters by comparing the measured and simulated chlorine concentrations at the monitored nodes within the distribution system in a least square sense using a normalized quadratic cost function. Since this function involves a non- explicit expression of the model, a genetic algorithm (GA) is applied to optimize the model parameters by minimizing the difference between the model-predicted values and the field-measured ones. The method is applied to a part of the Barcelona drinking water network.

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    Control de actitud de un cohete de sondeo atmosférico  Open access

     Manent Bistué, Pau; Quevedo Casin, Joseba-jokin; Morcego Seix, Bernardo
    Jornadas de Automática
    Presentation's date: 2013-09-05
    Presentation of work at congresses

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    Un cohete necesita de un sistema de control de actitud para superar posibles perturbaciones. Sobre un cohete pueden aparecer fuerzas que lo desestabilicen de una trayectoria idealmente vertical: viento, desalineamiento de las fuerzas de empuje, asimetría de la carga, etc. Éstas y muchas más son las perturbaciones de un cohete, y para evitar que éste se desestabilice y caiga o explote se requiere de un sistema que controle su actitud. En el presente estudio se opta por un sistema de control activo basado en modificar la dirección del vector empuje simbolizado con TVC (Thrust Vector Control). El estudio está dividido en dos partes: una primera parte en que se modela matemáticamente el cohete y el sistema de control de empuje y una segunda parte en que se estudia el comportamiento de distinta s estructuras de control (PID clásico, control predictivo MPC (Model of Predictive Control) y control auto-sintonizado STR (Self-Tuning Regulator)). Se finaliza con la elección de un sistema de control y sus parámetros. Finalmente, la última sección se dedica al estudio del control discreto y en que se tratan temas relacionados con el tiempo de muestreo, la sensibilidad y la precisión de los sensores, entre otros. En este estudio se hace especial hincapié en comparar la respuesta de distintos modelos de control de una planta inestable.

    Un cohete necesita de un sistema de control de actitud para superar posibles perturbaciones. Sobre un cohete pueden aparecer fuerzas que lo desestabilicen de una trayectoria idealmente vertical: viento, desalineamiento de las fuerzas de empuje, asimetría de la carga, etc. Éstas y muchas más son las perturbaciones de un cohete, y para evitar que éste se desestabilice y caiga o explote se requiere de un sistema que controle su actitud. En el presente estudio se opta por un sistema de control activo basado en modificar la dirección del vector empuje simbolizado con TVC (Thrust Vector Control). El estudio está dividido en dos partes: una primera parte en que se modela matemáticamente el cohete y el sistema de control de empuje y una segunda parte en que se estudia el comportamiento de distinta s estructuras de control (PID clásico, control predictivo MPC (Model of Predictive Control) y control auto-sintonizado STR (Self-Tuning Regulator)). Se finaliza con la elección de un sistema de control y sus parámetros. Finalmente, la última sección se dedica al estudio del control discreto y en que se tratan temas relacionados con el tiempo de muestreo, la sensibilidad y la precisión de los sensores, entre otros. En este estudio se hace especial hincapié en comparar la respuesta de distintos modelos de control de una planta inestable.

  • Localización de fugas en redes de distribución de agua potable

     Pérez Magrané, Ramon; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Nejjari Akhi-elarab, Fatiha; Pascual Pañach, Josep; Sanz Estapé, Gerard; Cuguero Escofet, Miquel Àngel; Cembrano Gennari, M.gabriela Elena; Landeros, Edson; Peralta, Antoni; Mirats Tur, Josep Maria; Meseguer, Jordi
    Automática e instrumentación
    Date of publication: 2012-02
    Journal article

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    Abnormal quality detection and isolation in water distribution networks using simulation models  Open access

     Nejjari Akhi-elarab, Fatiha; Pérez Magrané, Ramon; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Sarrate Estruch, Ramon; Cuguero Escofet, Miquel Àngel; Sanz Estapé, Gerard; Mirats Tur, Josep Maria
    Drinking water engineering and science
    Date of publication: 2012-11-16
    Journal article

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    This paper proposes a model based detection and localisation method to deal with abnormal quality levels based on the chlorine measurements and chlorine sensitivity analysis in a water distribution network. A fault isolation algorithm which correlates on line the residuals (generated by comparing the available chlorine measurements with their estimations using a model) with the fault sensitivity matrix is used. The proposed methodology has been applied to a District Metered Area (DMA) in the Barcelona network.

    This paper proposes a model based detection and localisation method to deal with abnormal quality levels based on the chlorine measurements and chlorine sensitivity analysis in a water distribution network. A fault isolation algorithm which correlates on line the residuals (generated by comparing the available chlorine measurements with their estimations using a model) with the fault sensitivity matrix is used. The proposed methodology has been applied to a District Metered Area (DMA) in the Barcelona network.

  • 20th Mediterranean Conference on Control and Automation

     Quevedo Casin, Joseba-jokin
    IEEE control systems magazine
    Date of publication: 2012-11-12
    Journal article

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  • Mejorar la eficiencia utilizando técnicas de control predictivo

     Puig Cayuela, Vicenç; Ocampo Martinez, Carlos A.; Cembrano Gennari, M.gabriela Elena; Quevedo Casin, Joseba-jokin; Creus, R.; Minoves, M.
    Automática e instrumentación
    Date of publication: 2012-02
    Journal article

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  • Hydroptim: una herramienta para el control predictivo basado en modelos

     Romera Formiguera, Juli; Rodriguez, P.; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; de Campos, S.
    Automática e instrumentación
    Date of publication: 2012-02
    Journal article

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  • Sensores de nivel: tecnologías y funcionalidades

     Quevedo Casin, Joseba-jokin; Masip Alvarez, Albert
    Automática e instrumentación
    Date of publication: 2012-11
    Journal article

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    Tan importante es hoy en día la tecnología que utilizan los sensores para medir correctamente la variable de interés como que dispongan de capacidad de auto-calibrado, de filtrado, de diagnóstico de fallos, de tolerancia ante fallos y de transmitir al sistema de monitorización los datos con o sin cable y con el mínimo de consumo energético. Por esta razón, los fabricantes de sensores de proceso están poniendo el énfasis en mejorar sus prestaciones funcionales, incrementando así el valor añadido.

  • SYSTEM HEALTH MANAGEMENT AND RELIABLE CONTROL OF COMPLEX SYSTEMS

     Puig Cayuela, Vicenç; Escobet Canal, Teresa; Saludes Closa, Jordi; Nejjari Akhi-elarab, Fatiha; Morcego Seix, Bernardo; De Las Heras Jimenez, Salvador Augusto; Escobet Canal, Antoni; Comasolivas Font, Ramon; Sarrate Estruch, Ramon; Pérez Magrané, Ramon; Tornil Sin, Sebastian; Masip Alvarez, Albert; Rotondo, Damiano; Vento Maldonado, Jorge Isaac; Blesa Izquierdo, Joaquin; Cuguero Escofet, Miquel Àngel; Romera Formiguera, Juli; Pascual Pañach, Josep; Sanz Estapé, Gerard; Cuguero Escofet, Josep; Quevedo Casin, Joseba-jokin
    Participation in a competitive project

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  • 20th Mediterranean Conference on Control and Automation

     Quevedo Casin, Joseba-jokin
    Participation in a competitive project

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  • EFFICIENT INTEGRATED REAL TIME MONITORING AND CONTROL OF DRINKING WATER NETWORKS

     Cuguero Escofet, Josep; Ocampo Martinez, Carlos A.; Quevedo Casin, Joseba-jokin; Sarrate Estruch, Ramon; Nejjari Akhi-elarab, Fatiha; Pérez Magrané, Ramon; Puig Cayuela, Vicenç
    Participation in a competitive project

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  • Combining health monitoring and control

     Escobet Canal, Teresa; Quevedo Casin, Joseba-jokin; Puig Cayuela, Vicenç; Nejjari Akhi-elarab, Fatiha
    Date of publication: 2012-09
    Book chapter

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  • Automatic design of robust PID controllers based on QFT specifications

     Comasolivas Font, Ramon; Escobet Canal, Teresa; Quevedo Casin, Joseba-jokin
    IFAC Conference on Advances in PID Control
    Presentation's date: 2012-03-30
    Presentation of work at congresses

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    This paper proposes an optimization algorithm for the automatic design of robust PID controllers using Quantitative Feedback Theory (QFT) specifications. The proposed algorithm is based on a criterion to minimize the energy of the control effort. To illustrate the methodology, the pitch angle of a laboratory helicopter is used as a model application with structured uncertainty. The results show that the design of robust controller can be formulated using an objective function and a number of restrictions that are developed as specifications.

  • Fault detection and isolation of a real PEM fuel cell using interval LPV observers

     de Lira Ramírez, Salvador; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin
    IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes
    Presentation's date: 2012-08-29
    Presentation of work at congresses

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    The purpose of this paper is to design a Fault Detection and Isolation (FDI) system based on interval LPV observers with application to a real fuel cell. The interval LPV observer is used to generate an adaptive threshold to enhance the robustness of the fault detection test. Real field data and system identification techniques are used to identify the nominal model as well as its uncertainty. Since fuel cells are highly non-linear systems when operating in their whole range of operation, a LPV model is used. Finally, fault isolation is based on an algorithm that uses the residual fault sensitivity. Several fault scenarios are used to show the performance of the proposed approach.

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    Methodology to detect and isolate water losses in water hydraulic networks: application to Barcelona water network  Open access

     Quevedo Casin, Joseba-jokin; Pérez Magrané, Ramon; Pascual Pañach, Josep; Puig Cayuela, Vicenç; Cembrano Gennari, M.gabriela Elena; Peralta, Antoni
    IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes
    Presentation's date: 2012-08-29
    Presentation of work at congresses

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    This paper presents a methodology to detect real water losses in urban water networks. The proposed method is based on the combined use of the DMA economical water balance confidence intervals for a period of time longer than a month (a trimester, semester or year) with appropriated night flow ratio intervals. This method allows distinguishing between real and apparent water losses in a given DMA. The use of uncertainty models allows taking into account measurement uncertainty of the flow data sensors. The use of different periods of time allows the stabilization of the results. This methodology is illustrated in a DMA of the Barcelona water distribution network using real data.

    Postprint (author’s final draft)

  • Data validation and reconstruction of flowmeters to provide the annual efficiency of ATLL transport water network in Catalonia

     Quevedo Casin, Joseba-jokin; Pascual Pañach, Josep; Puig Cayuela, Vicenç; Saludes Closa, Jordi; Espin, S; Roquet, J
    New Developments in IT & Water
    Presentation's date: 2012-11-05
    Presentation of work at congresses

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  • Model predictive control of combined irrigation and water supply systems: application to the Guadiana river

     Puig Cayuela, Vicenç; Ocampo Martinez, Carlos A.; Romera Formiguera, Juli; Quevedo Casin, Joseba-jokin; Rodriguez, Pablo; de Campos, Sergi; Negerborn, Rudy
    IEEE International Conference on Networking, Sensing and Control
    Presentation's date: 2012-04-12
    Presentation of work at congresses

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    In this paper, a methodology for the optimal management of a combined irrigation and water supply system based on model predictive control (MPC) is proposed. A controloriented modelling methodology for this type of systems is presented as well. MPC is used to generate flow control strategies from the sources to the consumer and irrigation areas to meet future demands with appropriate flows, optimizing operational goals such as network safety volumes in dams and flow control stability in actuators (valves, gates and pumps). The case study of Guadiana river is used to exemplify and verify the proposed optimal management methodology. Results have shown the effectiveness of the proposed modelling and control methodologies.

  • A fault/anomaly system prognosis using a data-driven approach considering uncertainty

     Escobet Canal, Teresa; Quevedo Casin, Joseba-jokin; Puig Cayuela, Vicenç
    IEEE World Congress on Computational Intelligence
    Presentation's date: 2012-06-12
    Presentation of work at congresses

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  • PLIO: a generic tool for real-time operational predictive optimal control of water networks

     Cembrano Gennari, M.gabriela Elena; Quevedo Casin, Joseba-jokin; Puig Cayuela, Vicenç; Pérez Magrané, Ramon; Figueras Jove, Jaume; Verdejo, M.; Escaler, I.; Ramón, G.; Barnet, P.; Rodríguez, P.; Casas, M.
    Water science and technology
    Date of publication: 2011-07
    Journal article

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  • LPV Observer design for PEM fuel cell system: Application to fault detection

     de Lira Ramírez, Salvador; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Husar, Attila Peter
    Journal of power sources
    Date of publication: 2011-02-01
    Journal article

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    In this paper, the modelling of an energy generation system based on polymer electrolyte membrane fuel cell (PEMFC) system through a parameter varying approach (LPV model), that takes in to account model parameter variation with the operating point, is presented. This model has been obtained through a Jacobian linearization of the PEMFC non-linear dynamic model that was previously calibrated using real data from lab. In order to illustrate the use of the LPV model obtained its application to model-based fault detection is used. For this purposes a set of common fault scenarios, which could appear during a normal PEMFC operation, is used as case study.

  • Methodology for Leakage Isolation using Pressure Sensitivity Analysis in Water Distribution Networks

     Pérez Magrané, Ramon; Puig Cayuela, Vicenç; Pascual Pañach, Josep; Quevedo Casin, Joseba-jokin; Landeros, E.; Peralta, Antoni
    Control engineering practice
    Date of publication: 2011-07
    Journal article

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  • Multi-objective optimization strategy for designing aircraft noise abatement procedures. Case study at Girona airport

     Prats Menéndez, Xavier; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin
    Transportation research. Part D, transport and environment
    Date of publication: 2011-01
    Journal article

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    The optimization of aircraft noise abatement procedures involves several conflicting factors, including location specific noise sensitivity and aircraft operating costs. This paper presents a multi-objective optimization strategy that employs goal, lexicographic-egalitarian and hierarchical optimization techniques. The presented methodology aims at better assessing the design of site-specific noise abatement procedures that take into account the actual populated areas, their type and distribution, the hour of the day where the trajectory is supposed to be flown and the aircraft type. An illustrative example is given with the design of the East departures at Girona airport, Catalonia. Results point out how the noise annoyance impact of current operational procedures can be significantly reduced by the optimized trajectories and show, as well, an important dependency on the type of aircraft and the hour of the day

  • Equitable aircraft noise abatement departure procedures

     Prats Menéndez, Xavier; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin
    Journal of guidance control and dynamics
    Date of publication: 2011-01
    Journal article

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    This paper deals with the optimization of aircraft noise-abatement departure procedures. A multicriteria optimization strategy is presented, where the fairness of the optimal trajectories is assessed vis-à-vis the different noise-sensitive locations around the airport of study. This equitable optimization is formulated as the minimization of the maximum noise-annoyance deviation regarding all considered locations. This strategy is complemented with an iterative lexicographic optimization algorithm which, in turn, guarantees the Pareto efficiency condition of the final solution. Aircraft operating costs are also considered by neglecting the marginal benefits of noise reduction below a certain threshold value. An application example is shown (as an illustrative case) based on a departure of runway 02 at Girona airport in Catalonia, Spain. The results show the feasibility of this technique, which is intended to be used by procedure designers or airport authorities.

  • Netolift. Investigación de tecnologías para elevación "Net Zero". Entregable 5.2.5.b

     Quevedo Casin, Joseba-jokin; Escobet Canal, Teresa; De Las Heras Jimenez, Salvador Augusto; Garcia Valverde, Diego
    Date: 2011-01-12
    Report

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  • Netolift. Investigación de tecnologías para elevación "Net Zero". Entregable 5.2.5.a

     Quevedo Casin, Joseba-jokin; Escobet Canal, Teresa; De Las Heras Jimenez, Salvador Augusto; Garcia Valverde, Diego
    Date: 2011-01-12
    Report

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  • GECOZI. Case Study. Regulation capability evaluation

     Quevedo Casin, Joseba-jokin; Puig Cayuela, Vicenç; Romera Formiguera, Juli
    Date: 2011-05-24
    Report

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  • GEstió i COntrol de Zones Inundables per minimitzar els Impactes mediambientals de les crescudes dels rius. Aplicació a la conca Pirenaica (CTP-DGR)

     Puig Cayuela, Vicenç; Cembrano Gennari, M.gabriela Elena; Escobet Canal, Antoni; Nejjari Akhi-elarab, Fatiha; Morcego Seix, Bernardo; Pérez Magrané, Ramon; Saludes Closa, Jordi; Ocampo Martinez, Carlos A.; Romera Formiguera, Juli; Quevedo Casin, Joseba-jokin
    Participation in a competitive project

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  • MAKING SENSE OF NONSENSE

     Puig Cayuela, Vicenç; Rotondo, Damiano; Ocampo Martinez, Carlos A.; Rosich Oliva, Albert; Saludes Closa, Jordi; Garcia Valverde, Diego; Sarrate Estruch, Ramon; Blesa Izquierdo, Joaquin; Nejjari Akhi-elarab, Fatiha; Comasolivas Font, Ramon; Cuguero Escofet, Miquel Àngel; Quevedo Casin, Joseba-jokin
    Participation in a competitive project

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  • Aportació al disseny de sistemes de control basats en models intervalars  Open access

     Comasolivas Font, Ramon
    Defense's date: 2011-04-29
    Department of Automatic Control, Universitat Politècnica de Catalunya
    Theses

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    En diverses tècniques de control robust és habitual treballar amb plantes incertes, el comportament de les quals es pot descriure raonablement segons incertesa paramètrica mitjançant models lineals intervalars. La QFT (Quantitative Feedback Theory) és una d’aquestes tècniques de control robust, que treballa bàsicament amb especificacions donades en el domini freqüencial. L’aportació d’aquest treball es centra en diversos aspectes relacionats amb la problemàtica del control de sistemes amb incertesa paramètrica, amb l’estructura estàndard de control a llaç tancat amb realimentació negativa, i amb la possible existència de pre-filtre, si hi cal. L’ús de l’aritmètica intervalar facilita la representació d’incerteses i a més permet la implementació de tècniques d’anàlisi i de disseny que poden ser utilitzades per al control robust de sistemes. Per evitar la problemàtica associada a la representació de conjunts i els problemes que comporta en quant a multi-incidència i wrapping, el mètode adoptat en aquesta tesis per representar el conjunts utilitza una boira de punts i les operacions es realitzen de forma determinista (graella).Un primer aspecte del treball, en el cas que s’hagin comprovat la compatibilitat d’especificacions i l’existència de controlador, s’orienta en la recerca de l’espai de paràmetres del controlador d’estructura pre-fixada i baix ordre, aprofitant eines d’aritmètica intervalar tals com el concepte de projecció d’un conjunt i la seva implementació en algorismes concrets, basats en els principis de satisfacció de restriccions.Una qüestió a tenir en compte en treballar amb especificacions freqüencials és la dificultat de trobar una equivalència directa entre especificacions temporals i freqüencials. La tesi també fa incidència en el cas particular d’un tipus d’especificació temporal de seguiment de trajectòria o tracking que, sota determinades hipòtesis, alguns autors proposen una equivalència freqüencial. En el present treball es fa una aportació de simplificació del procés de disseny, remarcable per què una nova especificació (de sensitivitat) substituiria l’original (de seguiment). Aleshores, en cas d’existir una especificació addicional pròpiament de sensitivitat, ambdues quedarien integrades en una única especificació de sensitivitat, simplificant-se així el procés de disseny. I a més, el mètode proposat dóna de forma immediata el disseny del pre-filtre.També en la present tesi es treballa en una metodologia per automatitzar el disseny de controladors. Es proposa un algorisme de disseny automàtic (Automatic Loop Shaping, ALS) en el marc de la QFT, en el que s’aplica un criteri de minimització energètica de l’energia impulsional del controlador. Per validar les metodologies proposades es mostren un parell de casos d’estudi. El primer cas és el d’un interferòmetre real, utilitzat per al posicionament d’uns segments de mirall en un telescopi, on la problemàtica bàsica és l’existència de pertorbacions mecàniques. El segon cas és el d’un model simplificat de l’angle de capcineig d’un helicòpter de laboratori, amb incertesa estructurada i paramètrica. En ambdós casos els resultats simulats i experimentals han estat molt satisfactoris.

    Robust control techniques often work with uncertain plants whose behavior can be described according to linear models using parametric uncertainty intervals. Quantitative feedback theory (QFT) is one such technique that works mainly with frequency domain specifications. This thesis focuses on aspects related to the problem of control systems with parametric uncertainty, using the standard closed-loop control structure, negative feedback and a pre-filter, if required.Interval arithmetic is helpful when representing uncertainty and allows the use of analysis and design techniques for robust system control. With a view to avoiding the problems associated with the representation of sets, multi-incidence and wrapping, in this thesis a cloud of points is used to represent the sets and the operations are performed in a deterministic way (grid).Once the compatibility of specifications and the existence of a controller have been verified, research is conducted into the controller parameter space with a pre-fixed and low-order structure using interval arithmetic tools such as the projection of sets and their implementation in specific algorithms based on constraint satisfaction principles. The difficulty of finding a direct equivalence between temporal and frequency specifications must be taken into account when one is working with frequency specifications. This thesis emphasizes on the temporal specification of tracking, for which under certain hypotheses some authors propose a frequency specification equivalent. A method is proposed to simplify the design process by replacing the original specification (tracking) with a new one (sensitivity). If there is an additional sensitivity specification, both are integrated in a single one, thus simplifying the design process. The proposed method also gives the pre-filter design. This thesis also deals with a methodology for automating controller design. An automatic design algorithm (automatic loop shaping, or ALS) is proposed in the QFT framework, in which a criterion of energy minimization on the controller’s impulse response is applied. Two case studies are presented to validate the proposed methodologies. First one is a real interferometer that is used for positioning mirror segments in a telescope. The basic problem here is the existence of mechanical disturbances. The second case study is a simplified model of a laboratory helicopter’s pitch angle with structured parametric uncertainty. In both cases the simulated and experimental results were highly satisfactory.

  • Model Based Fault Detection and Isolation for a PEM Fuel CELL SYSTEM

     de Lira Ramírez, Salvador
    Defense's date: 2011-10-31
    Institute of Industrial and Control Engineering (IOC), Universitat Politècnica de Catalunya
    Theses

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    Flooding management using hybrid model predictive control at the Ebro river in Spain  Open access

     Romera Formiguera, Juli; Ocampo Martinez, Carlos A.; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; García Navarro, María del Pilar; Pérez, Guillermo
    IWA Symposium on Systems Analysis and Integrated Assessment
    Presentation's date: 2011
    Presentation of work at congresses

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    Flooding prevention and control in rivers is a important topic in the river management. This is also the case in the basin of the river Ebro in Spain. In the past, the Ebro basin experienced several floods. In order to reduce the flood hazard in a given area, the local water administration usually sets up several flood-controlled areas for being able to store the excessive water volume during periods of extreme rainfall. In order to control the flows to and from the flooding zones, hydraulic control structures have been put in place. Through these actions, it is planned to have a significant reduction of the flood risk in the basin. Recent simulations of these past events in a hydrodynamic river model showed that flooding could have been significantly reduced and even avoided if the hydraulic structures would have been controlled in a different way. Therefore, the main interest of this paper is to test a different control strategy than the one currently adopted. Due to the specific nature of the flooding problem, a model predictive control (MPC) strategy (Maciejowski, 2001) seems to be the most suitable option. In this paper, the problem of flooding control at the Ebro River in Spain is addressed using MPC. Finally, several scenarios are used to validate the performance of the proposed approach. In Section 2, the problem addressed in this paper is described. In Section 3, a control oriented model is proposed. In Section 4, the control approach based on an MPC is described. Results of the application of the proposed control approach using a Virtual reality simulator are presented in Section 5. Finally, in Section 6, the main conclusions are presented.

    Postprint (author’s final draft)

  • Study of the isolability of leaks in a network depending on calibration of demands

     Pérez Magrané, Ramon; Nejjari Akhi-elarab, Fatiha; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Sanz Estapé, Gerard; Cuguero Escofet, Miquel Àngel; Peralta, Antoni
    Computing and Control for the Water Industry
    Presentation's date: 2011-09-06
    Presentation of work at congresses

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    Using the simulation models a methodology was developed for leakage detection and localisation in a water distribution network [4]. Such methodology is based on fault detection and isolation techniques. Sensitivity matrix of pressures to leaks [8] is generated using simulation models [1]. Such models are available in water companies. The methodology showed promising results but two main issues appeared. Calibration in models and precision in sensors was required. Investment in sensors could be afforded [6] as long as models were well calibrated enough. The main uncertainty in models lies on demands. This paper presents a study of the effect of an improvement in demand calibration on isolability of leaks. The aim is to quantify the return of an effort in calibrating in terms of leak detection one of the main issues in water industry [2].

  • Abnormal Quality Detection and Isolation in Water Distribution Networks using Simulation Models

     Nejjari Akhi-elarab, Fatiha; Pérez Magrané, Ramon; Puig Cayuela, Vicenç; Quevedo Casin, Joseba-jokin; Sarrate Estruch, Ramon; Cuguero Escofet, Miquel Àngel; Sanz Estapé, Gerard; Mirats Tur, Josep Maria
    Computing and Control for the Water Industry
    Presentation's date: 2011-09-06
    Presentation of work at congresses

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    This paper proposes a model based detection and localisation method to deal with abnormal quality levels based on the chlorine measurements and chlorine sensitivity analysis in a water distribution network. A fault isolation algorithm which correlates on line the residuals (generated by comparing the available chlorine measurements with their estimations using a model) with the fault sensitivity matrix is used. The proposed methodology has been applied to a District Metered Area (DMA) in the Barcelona network.

    This paper proposes a model based fault localisation method to deal with abnormal quality levels based on the chlorine measurements and chlorine sensitivity analysis in a water distribution network. A fault isolation algorithm which correlates on line the residuals, generated by comparing the available chlorine measurements with their estimation using a model, with the fault sensitivity matrix is used. The proposed methodology has been applied to a District Metered Area (DMA) in the Barcelona network.