Josep M. Fuertes

Universitat Politècnica de Catalunya

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Pau Martí

Universitat Politècnica de Catalunya

Manel Velasco

Universitat Politècnica de Catalunya

Ricard Villà

Universitat Politècnica de Catalunya

José Yépez

Universidade Federal do Rio Grande

Camilo Lozoya

Tecnológico de Monterrey

Jordi Ayza

Universitat Jaume I

Gerhard Fohler

University of Kaiserslautern

Scott Brandt

University of California, Santa Cruz

J. Llacer

Lawrence Berkeley National Laboratory

Antonio Camacho

Universitat Politècnica de Catalunya

Cooperative Institutions

Universitat Politècnica de Catalunya

Lawrence Berkeley National Laboratory

TU Wien

University of California, Berkeley

Mälardalen University

Robotic Technology (United States)

Technische Universität Braunschweig

ABB (Switzerland)

University of Vienna

Institute of Electrical and Electronics Engineers

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Desarrollo de nuevos materiales para la docencia de comunicaciones industriales (libros y curso abierto OCW)

Norberto Alonso Vera Sempere Manuel Alonso Castro Gil Gabriel Díaz Domínguez

En este articulo se presenta el desarrollo de nuevos materiales para la imparticion de una asignatura de Comunicaciones Industriales, dentro de las carreras de Ingenieria Tecnica Industrial e Ingenieria Industrial, y con unos objetivos orientados a l

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One-step finite horizon boundary with varying control gain for event-driven Networked Control Systems

IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society (2011)

José Yépez Manel Velasco Pau Martí Enric X. Martín Josep M. Fuertes

Recent research has shown that event-driven control requires less samples than time-driven (periodic) control. Consequently, event-driven control applied to Networked Control Systems (NCS) is a good approach for alleviating controllers bandwidth demands and reducing overall network traffic. Following this trend, this paper presents an execution rule for event-driven networked controllers that at each job execution aims at postponing the next job execution while applying an appropriated controller gain considering each varying sampling interval that applies at run time. This method permits to dynamically lower the generated traffic for each networked control loop while ensuring the same or better control performance than the achieved by the periodic case. In addition, an implementation strategy capable of dealing with network induced time delays is also presented. Simulation results illustrate the operation and benefits of the presented approach.

Networked control system

10.1109/iecon.2011.6119721

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A Java/sup TM/-based framework for distributed supervision and control of industrial processes

Pau Martí Juan Carlos Aguado F. Rolando Manel Velasco J. Colomar

Provides an image of an ongoing research, within a field that is continually evolving, the distributed control of processes. The objective of this project is to remotely, or even locally, supervise and control an industrial process, providing a framework to integrate the process and its control system in the Internet. This framework will provide, by using objected oriented methodologies, general patterns to implement communication needs and to represent virtual industrial processes, which will be mapped to the real world, and its control. As a result, the control and monitoring of any industrial process will be attainable with independence of its physical location, as expected from a client-server architecture. This framework is based on Java/sup TM/, which is becoming an emerging technology in the Internet as well as in the industrial field.

Industrial control system

10.1109/etfa.1999.815336

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An algorithm to design prescribed length codes for single-tracked shaft encoders

Borja Balle Enric Ventura Josep M. Fuertes

Maximal-length binary shift register sequences have been known for a long time. They have many interesting properties, one of them is that when taken in blocks of n consecutive positions they form 2 ⁿ - 1 different codes in a closed circular sequence. This property can be used for measuring absolute angular positions as the circle can be divided in as many parts as different codes can be retrieved. This paper describes how a closed binary sequence with arbitrary length can be effectively designed with the minimal possible block-length, using linear feedback shift registers (LFSR). Such sequences can be used for measuring a specified exact number of angular positions, using the minimal possible number of detectors allowed by linear methods.

Sequence (biology)

Pseudorandom binary sequence

10.1109/icmech.2009.4957199

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Track Detection in Railway Sidings Based on MEMS Gyroscope Sensors

Sensors (2012)

A. Broquetas Adolfo Comerón Antoni Gelonch Josep M. Fuertes J. Antonio Castro

The paper presents a two-step technique for real-time track detection in single-track railway sidings using low-cost MEMS gyroscopes. The objective is to reliably know the path the train has taken in a switch, diverted or main road, immediately after the train head leaves the switch. The signal delivered by the gyroscope is first processed by an adaptive low-pass filter that rejects noise and converts the temporal turn rate data in degree/second units into spatial turn rate data in degree/meter. The conversion is based on the travelled distance taken from odometer data. The filter is implemented to achieve a speed-dependent cut-off frequency to maximize the signal-to-noise ratio. Although direct comparison of the filtered turn rate signal with a predetermined threshold is possible, the paper shows that better detection performance can be achieved by processing the turn rate signal with a filter matched to the rail switch curvature parameters. Implementation aspects of the track detector have been optimized for real-time operation. The detector has been tested with both simulated data and real data acquired in railway campaigns.

SIGNAL (programming language)

10.3390/s121216228

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A novel neural network structure for control

Joan Codina Bernardo Morcego Josep M. Fuertes Andreu Català

A novel dynamic neural network structure is developed for simulating and controlling dynamic systems. Using this kind of neural network, a controller for a hovering platform was investigated. The network description and attempts made to simulate the hovering platform behavior are presented.< >

10.1109/icsmc.1992.271599

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Citations (2)

Neural Network Modeling of an Aerosuspended Vehicle

IFAC Proceedings Volumes (1992)

Josep M. Fuertes Bernardo Morcego Joan Codina Andreu Català

10.1016/s1474-6670(17)50891-5

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Qualitative analysis of a one-step finite-horizon boundary for event-driven controllers

Manel Velasco Pau Martí José Yépez Francisco J. Ruíz Josep M. Fuertes

Performance optimization for networked and embedded control systems refers to the ability of minimizing controllers' resource utilization and/or improving control performance. Event-driven control has been shown to be a promising technique for minimizing controllers' computational demands. However, optimization of control performance for event-driven control has not been fully addressed. For LTI plants, this paper presents a boundary for event-driven controllers that determines at each job execution when the next job execution should occur in order to minimize a continuous-time quadratic cost function while minimizing controllers' computational demand. Simulation results illustrate the qualitative shape of this boundary.

10.1109/cdc.2011.6161106

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Citations (22)

<title>Emulator for the W. M. Keck 10-m telescope</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1990)

Josep M. Fuertes R.C. Jared J. Llacer

The pistons and tilts of the 36 segments of the Keck Telescope primary mirror are under active control. The mechanical and electronic designs of the actuators used to achieve this control are described along with the performance of the actuators under a variety of tests. In use, the actuators will move in 4-nm increments. This resolution and the accuracy of the actuator moves are adequate for stabilizing the figure of the primary mirror to the precision required for optical and infrared astronomy.

Active optics

Secondary mirror

10.1117/12.19264

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Optimal State Feedback Based Resource Allocation for Resource-Constrained Control Tasks

Pau Martí Caixue Lin Scott Brandt Manel Velasco Josep M. Fuertes

In many application areas, including control systems, careful management of system resources is key to providing the best application performance. Most traditional resource management techniques for real-time systems with multiple control loops are based on open-loop strategies that statically allocate a constant CPU share to each controller, independent of their current resource needs. This provides average control performance with minimal overhead but in general fails to provide the best performance possible within the available resources. We show that by using feedback to dynamically allocate resources to controllers as a function of the current state of their controlled systems, control performance can be significantly improved. We present an optimal resource allocation policy that maximizes control performance within the available resources and provide experimental results showing that the optimal policy 1) significantly increases control performance compared to traditional control system implementations (by more than 20% in our experiments), 2) maximizes control performance over other feedback-based policies, 3) saves resources when perturbations occur infrequently, and 4) incurs negligible overhead.

Resource Management

Implementation

10.1109/real.2004.39

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Citations (78)