http://hdl.handle.net/2117/1125 2013-05-25T18:07:03Z http://hdl.handle.net/2117/18996 Title: Flooding management using hybrid model predictive control: Application to the Spanish Ebro River Authors: Romera Formiguera, Juli; Ocampo-Martínez, Carlos; Puig Cayuela, Vicenç; Quevedo Casín, Joseba Jokin Abstract: 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 2013-04-26T08:15:14Z http://hdl.handle.net/2117/18715 Title: Quasi-LPV modeling, identification and control of a twin rotor MIMO system Authors: Rotondo, Damiano; Nejjari Akhi-Elarab, Fatiha; Puig Cayuela, Vicenç Abstract: This paper describes the quasi-linear parameter varying (quasi-LPV) modeling, identification and control of a Twin Rotor MIMO System (TRMS). The non-linear model of the TRMS is transformed into a quasi-LPV system and approximated in a polytopic way. The unknown model parameters have been calibrated by means of the non-linear least squares identification approach and validated against real data. Finally, an LPV state observer and state-feedback controller have been designed using an LPV pole placement method based on LMI regions. The effectiveness and performance of the proposed control approach have been proved both in simulation and on the real set-up. 2013-04-09T08:02:32Z http://hdl.handle.net/2117/18476 Title: Experiences of simulation use in industrial projects Authors: Fonseca Casas, Pau; Casanovas Garcia, Josep; Montero García, Jordi; Guasch Petit, Antonio Abstract: This paper presents experiences obtained from our involvement in the development of industrial simulation projects. Some important, common questions are covered, such as the need to define model behavior using a conceptual model, the problem of choosing the appropriate tool to code the model, and the validation and verification process required. As we will see, the scope of applicability of simulation is broad and the tools are therefore diverse. A clear understanding of the objectives of the simulation, the client’s aims and the resources at our disposal are key issues that often determine the success of a simulation project. 2013-03-22T10:34:19Z http://hdl.handle.net/2117/18424 Title: Application of predictive control strategies to the management of complex networks in the urban water cycle Authors: Ocampo-Martínez, Carlos; Puig Cayuela, Vicenç; Cembrano Gennari, Gabriela; Quevedo Casín, Joseba Jokin Abstract: The management of the urban water cycle (UWC) is a subject of increasing interest because of its social, economic, and environmental impact. The most important issues include the sustainable use of limited resources and the reliability of service to consumers with adequate quality and pressure levels, as well as the urban drainage management to prevent flooding and polluting discharges to the environment. 2013-03-19T18:02:56Z http://hdl.handle.net/2117/18103 Title: An Open source multiplatform virtual laboratory for engineering education : special focus paper Authors: Fernández Canti, Rosa M.; Lázaro Villa, José Antonio; Zarza Sánchez, Sergio; Villar Zafra, Aitor Abstract: An autonomous and multiplatform virtual laboratory for educational purposes is presented. The implemented platform includes a server with a SSH (Secure SHell) connection and a separated repository containing the virtual experiments. The programming of the experiments is implemented in Java language based tool, the EJS (Easy Java Simulation) and uses an external computation engine, for example Matlab. The virtual laboratory provides control system experiments at University level. Two application examples are described, namely, a magnetic levitator and an inverted pendulum-cart system. The virtual laboratory has been successfully used for education and training of Electronics Engineering students. A discussion of the results of this e-learning experience is also presented. 2013-03-06T13:41:53Z http://hdl.handle.net/2117/18078 Title: Robust identification and fault diagnosis based on uncertain multiple input-multiple output linear parameter varying parity equations and zonotopes Authors: Blesa Izquierdo, Joaquim; Puig Cayuela, Vicenç; Saludes Closa, Jordi 2013-03-05T18:24:53Z http://hdl.handle.net/2117/17698 Title: Metodologías de modelado y simulación para la mejora de sistemas logísticos y de producción Authors: Guasch Petit, Antonio; Ramos, J 2013-02-13T09:25:20Z http://hdl.handle.net/2117/17694 Title: Preface: Introduction to special issue Authors: Guasch Petit, Antonio; Piera, MA 2013-02-13T07:56:30Z http://hdl.handle.net/2117/17672 Title: Sensores de nivel: tecnologías y funcionalidades Authors: Quevedo Casín, Joseba Jokin; Masip Álvarez, Albert Abstract: 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. 2013-02-12T16:02:54Z http://hdl.handle.net/2117/17423 Title: Optimización de sistemas logísticos mediante simulación: Una metodologia basada en redes de Petri coloreadas Authors: Narciso, M.E.; Piera, M.A.; Figueras Jové, Jaume Abstract: Los modelos de simulación han demostrado ser útiles para evaluar el rendimiento de diferentes configuraciones i/o procedimientos de operación alternativos para sistemas complejos y sistemas de producción. Sin embargo, cuando aplicamos las técnicas de simulación para mejorar el rendimiento y competitividad de sistemas surgen varias limitaciones debido a la incapacidad de evaluar más de una fracción del inmenso rango de opciones (escenarios) disponibles. En este artículo se describe un nuevo enfoque para integrar métodos de evaluación (simulación) con métodos de búsqueda (optimización) basados no sólo en resultados de simulación, sino usando también la información que proporciona el modelo de simulación. 2013-01-18T13:07:24Z http://hdl.handle.net/2117/17036 Title: Abnormal quality detection and isolation in water distribution networks using simulation models Authors: Nejjari Akhi-Elarab, Fatiha; Pérez Magrané, Ramon; Puig Cayuela, Vicenç; Quevedo Casín, Joseba Jokin; Sarrate Estruch, Ramon; Cugueró Escofet, Miquel Àngel; Sanz Estapé, Gerard; Mirats, J M Abstract: 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. 2012-11-27T16:42:16Z http://hdl.handle.net/2117/16506 Title: Review of the dielectric properties of nanofiltration membranes and verification of the single oriented layer approximation Authors: Oatley, Darren Lee; Llenas Argelaguet, Laia; Pérez Magrané, Ramon; Williams, Paul M.; Martínez Lladó, Xavier; Rovira Boixaderas, Miquel Abstract: The structuring of water at soft solid surfaces remains an area of great interest to colloid science as a whole and has many applications in relation to colloid stability, foams, and wetting films as well as being central to membrane separations. Quantitatively calculating the structural components of thin layers of water and the interaction forces of hydrated molecules with the surface of pores through a layer of water having modified structure is one of the most important challenges in the physics of surface phenomenon. In this paper these effects are reviewed and discussed in relation to the confines of a capillary pore. Membrane nanofiltration is extremely complex and is dependent on the micro-hydrodynamics and interfacial events occurring at the membrane surface and within the membrane nanopores. There is significant debate as to the exact nature of these complex phenomena and rejection is typically attributed to a combination of steric and electrical effects. The electrical effects are less well understood and in particular the contribution of dielectric exclusion. A review of the two competing descriptions of dielectric exclusion is presented along with the theories currently used in modelling this phenomena. A series of rejection experiments of 0.01 M salt solutions at the membrane isoelectric point has been performed for the NF270 and NF99HF membranes. The dielectric constants inside the nanopore are calculated and these values were consistent for three of the salts studied, indicating that a simplistic model based on Born theory is accurate enough for engineering calculations and that ion solvation is most likely to be the more appropriate dielectric exclusion mechanism for true nanofiltration membranes. 2012-09-17T10:50:03Z http://hdl.handle.net/2117/16465 Title: Fault-tolerant control strategy for actuator faults using LPV techniques: Application to a two degree of freedom helicopter Authors: Montes de Oca, Saúl; Puig Cayuela, Vicenç; Witczak, Marcin; Dziekan, L. Abstract: In this paper, a Fault Tolerant Control (FTC) strategy for Linear Parameter Varying (LPV) systems that can be used in the case of actuator faults is proposed. The idea of this FTC method is to adapt the faulty plant instead of adapting the controller to the faulty plant. This approach can be seen as a kind of virtual actuator. An integrated FTC design procedure for the fault identification and fault-tolerant control schemes using LPV techniques is provided as well. Fault identification is based on the use of an Unknown Input Observer (UIO). The FTC controller is implemented as a state feedback controller and designed using polytopic LPV techniques and Linear Matrix Inequality (LMI) regions in such a way as to guarantee the closed-loop behavior in terms of several LMI constraints. To assess the performance of the proposed approach, a two degree of freedom helicopter is used. 2012-09-12T06:41:14Z http://hdl.handle.net/2117/16025 Title: Hydroptim: una herramienta para el control predictivo basado en modelos Authors: Romera Formiguera, Juli; Rodriguez, P.; Puig Cayuela, Vicenç; Quevedo Casín, Joseba Jokin; de Campos, S. 2012-06-12T10:52:50Z http://hdl.handle.net/2117/15990 Title: Automatic warehouse modelling and simulation Authors: Guasch Petit, Antonio; Piera, Miquel Àngel; Figueras Jové, Jaume Abstract: The newspaper production/distribution problem (NDP) involves a perishable good. Newspaper publishers cannot print the news sections of newspapers in advance, as they must be up to date. Additionally, delivery must be completed before morning commuting starts in metropolitan areas. Therefore, delivery delays at the printing plant are not acceptable, as they cause significant disturbances to the distribution chain. In this paper, we analyse the impact of using a second transelevator on the performance of a printing plant’s automatic warehouse with the aim to avoid delivery delays to the printing press. 2012-06-08T12:33:05Z