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Enhancing integrity in multivariable process control under actuator failures

IFAC Proceedings Volumes 2009年第8期42卷 1599-1604页

作者： A. Sala P. Albertos Department of Systems Engineering and Control Polytechnic University of Valencia Spain

Achieving fault tolerance in process control usually involves supervision and reconfiguration. On the other hand, common robust control approaches achieve a common performance level for a family of plants, which can be unsatisfactory in the nominal case if faulty conditions are not taken into account. This paper discusses the problem of guaranteeing both a nominal performance and a degraded second-class control performance under actuators' permanent faults, by using a time invariant controller. LMI, BMI and other possible solutions are investigated in a multivariable state feedback control framework. Two examples from the literature (reactor and jet bank angle control) illustrate the procedure.

关键词： integrity fault-tolerant control state feedback actuator failure LMI BMI

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IPTV distribution network access system using WiMAX and WLAN technologies

IPTV distribution network access system using WiMAX and WLAN...

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4th Edition of the UPGRADE-CN Workshop on Use of P2P, GRID and Agents for the Development of Content Networks, UPGRADE-CN'09, Co-located with the 2009 International Symposium on High Performance Distributed Computing Conference, HPDC'09

作者： Garcia, Miguel Lloret, Jaime Edo, Miguel Lacuesta, Raquel Communications Department Polytechnic University of Valencia Camino Vera s/n 46022 Valencia Spain Systems Engineering and Computer Department Zaragoza University C/Ciudad Escolar s/n 44003 Teruel Spain

ISBN: (纸本)9781605585918

The mobility and ubiquity for any type of device to access the IPTV network must be supplied by the service provider. The minimum bandwidth required in the access network to provide IPTV services jointly with the necessity to guarantee the Quality of Experience (QoE) to the user makes the need of algorithms to combine different wireless standards and technologies in the access network. In this paper, we propose a system that decides which type of wireless access network to connect with (for dual-band and tri-band devices) depending on the requirements of the IPTV client, the available networks, and some network parameters, such as the number of loss packets and packet delay, to provide the maximum QoE to the customer. The measurements taken in a real environment from the wireless networks allow us to know the weight of the parameters in the proposed algorithm. Copyright 2009 ACM.

关键词： IPTV

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Networked control of MIMO systems

Networked control of MIMO systems

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Asian control Conference

作者： Pedro Albertos Pedro Garcia Angel Cuenca Department of Systems Engineering and Control Technical University of Valencia Valencia Spain

In Networked control systems, delays are unavoidable. Moreover, loss of data should be taken into account. Smith-like predictor is the most common approach to cope with delays, but open loop stability is required to ensure internal stability. Some recent results allow dealing with these systems, if a SISO structure is concerned. In this paper, the design of a predictor-observer for possible unstable MIMO delayed systems is proposed. Also, a missing data reconstruction approach is proposed. The main result is illustrated by the networked control of an unstable chemical reactor.

关键词： control systems MIMO Communication system control Delay effects Networked control systems Stability Open loop systems Delay systems Actuators control design

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Guaranteed cost control for constrained Takagi-Sugeno fuzzy systems

Guaranteed cost control for constrained Takagi-Sugeno fuzzy ...

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作者： Ariño, Carlos Pérez, Emilio Sala, Antonio Department of Industrial Systems Engineering and Design Universitat Jaume i Avenida Vicent Sos Baynat s/n 12071 Castelló de la Plana Spain Dept. of Systems Engineering and Control Technical University of Valencia E-46022 Valencia Spain

ISBN: (纸本)9783902661661

This paper presents a novel control design technique in order to obtain a Guaranteed Cost Fuzzy controller subject to constraints on the input channel. This Guaranteed cost control law is obtained via multi-parametric Quadratic Programming. The result is a piecewise fuzzy control law where the state partition is defined by fuzzy inequalities. The parameters of the Lyapunov function can be obtained previously using linear matrix inequalities optimization.

关键词： Lyapunov functions

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Some remarks on polynomial fuzzy control

Some remarks on polynomial fuzzy control

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IEEE Conference on control Technology and Applications (CCTA)

作者： Antonio Sala Carlos Arino Department of Systems Engineering & Control Technical University of Valencia Valencia Spain Dept. of Systems Engineering & Control at the Technical University of Valencia Valencia Spain Industrial systems Engineering and Design Dept. Jaume I University Castelló de la Plana Spain

The paper deals with some issues in the fuzzy polynomial framework, presenting the polynomial sector-nonlinearity modelling, a novel control technique for fuzzy polynomial models (based on Finsler Lemma) and discusses... 详细信息

关键词： Polynomials Fuzzy control Fuzzy systems Takagi-Sugeno model control system synthesis Robust stability Nonlinear systems Nonlinear control systems control systems Nonlinear equations

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Toolpath postprocessing for three axes milling in redundant robotic workcells by means of fuzzy integration in a cam platform

Toolpath postprocessing for three axes milling in redundant ...

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International Conference on Mechatronics (ICM)

作者： Javier Andres Luis Gracia Hector Marti Josep Tornero Design Institute for Automated Production and Manufacturing Systems Technical University of Valencia Valencia Spain Department of Systems Engineering and Control Technical University of Valencia Valencia Spain

Nowadays, the use of kinematically redundant robotic workcells for machining tasks is increasing. It is due to their capacity to avoid singular configurations, although a choice among a set of possible configurations is required. Experience and knowledge of the workman in charge of the manufacturing process allow carrying out an efficient control of the movement in these cases. However, it is a tedious job. This article presents an effective implementation of a CAM-robotics integrated fuzzy postprocessor based on the position analysis. It is focused on a workcell consisting of one robotic manipulator (KUKA KR15/2 with 6 rotary joints) mounted on a linear axis and synchronized with a rotary table. After the implementation of the inverse kinematics position analysis, a stand-alone fuzzy controller has been programmed with Matlab's fuzzy logic toolbox (The MathWorks, Inc.). Two C++ programs complement the translation of toolpath position information from the NX-CAM platform (NXtrade-Siemens Corp.) into KRL (KUKA robot language), in order to adequate the location of the robot and the workpiece in the execution of the task and avoiding singularities or joint limits. This article solves the problem for a constant tool orientation milling process and sets the technological basis for future research at five axis milling operations.

关键词： Milling Computer aided manufacturing Service robots CADCAM Automatic control control systems Manipulators Robotics and automation Machining Fuzzy control

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Software Requirements for Ubiquitous Ad Hoc Mobile Networks: An Example of a Bluetooth Application

Software Requirements for Ubiquitous Ad Hoc Mobile Networks:...

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International Conference on Software engineering Advances (ICSEA)

作者： Raquel Lacuesta Lourdes Penalver Luis Fernandez-Sanz Jaime Lloret Miguel Garcia Department of Systems Engineering and Computer University of Zaragoza Teruel Spain Department of System Computer Polytechnic University of Valencia Valencia Spain Department of Computer Science University of Alcalá Alcala de Henares Spain Department of Communications Polytechnic University of Valencia Valencia Spain

In contrast with the simple and elegant concept of global computing, also called ubiquitous computing - where daily life objects get now computing capacity and interact among them to provide a wide range of services to users - a major difficulty is arising with the software engineering process to develop applications for these devices. This article discusses the additional parameters that should be taken into account when designing and developing software for ubiquitous devices in ad-hoc networks. In these networks the mobility of the devices could increase the complexity of the requirements to be considered. As a case study, we present a Bluetooth application that has been developed to fulfill a variety of established requirements. The application allows the creation of different types of networks for non-expert users thanks to the context aware capacity of Bluetooth.

关键词： Bluetooth Application software Computer networks Pervasive computing Ad hoc networks Computer network management Software engineering Mobile communication Ubiquitous computing Mobile computing

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Guaranteed Cost control For Constrained Takagi-Sugeno Fuzzy systems

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IFAC Proceedings Volumes 2009年第19期42卷 325-330页

作者： Carlos Ariño Emilio Pérez Antonio Sala Department of Industrial Systems Engineering and Design Universitat Jaume I Avenida Vicent Sos Baynat s/n. 12071 Castelló de la Plana Spain Dept. of Systems Engineering & Control at the Technical University of Valencia E-46022 Valencia Spain

Abstract This paper presents a novel control design technique in order to obtain a Guaranteed Cost Fuzzy controller subject to constraints on the input channel. This Guaranteed cost control law is obtained via multi-parametric Quadratic Programming. The result is a piecewise fuzzy control law where the state partition is defined by fuzzy inequalities. The parameters of the Lyapunov function can be obtained previously using linear matrix inequalities optimization.

关键词： Takagi-Sugeno fuzzy control LMI quadratic stability parallel distributed compensation piecewise control multi-parametric Quadratic Programming Constrained control

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Systematic analysis of the electric power and magnetic energy for linear electric and magnetic circuits with modifiable parameters

Systematic analysis of the electric power and magnetic energ...

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Eurocon

作者： Horia Andrei Fanica Spinei Ion Caciula Paul C. Andrei Control Systems and Computer Engineering Electrical Engineering Bucharest Polytechnic Institute Romania Radiating Systems Group Department of Applied Physics Faculty of Physics University of Bucharest Romania Romania Control Systems and Applied Informatics Valahia University of Targoviste Romania Department of Applied Informatics for Electrical Engineering Faculty of Electrical Engineering University of Bucharest Romania

The paper presents a new systematic analysis method in order to estimate the total absorbed power and energy in linear electric and magnetic circuits with modifiable parameters. The relation between the variation in one or all the resistances and reluctances of the networks and the variation of total absorbed power and energy are discussed using the Lagrange's method. For the considered applications the results are obtained with Mathematica and Maple useful for establishing the variation limits of absorbed power and energy.

关键词： Magnetic analysis Magnetic circuits Lagrangian functions Switching circuits H infinity control Stationary state Nonlinear systems

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Coverage tracking of a moving target by a group of mobile agents

Coverage tracking of a moving target by a group of mobile ag...

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Asian control Conference

作者： Xiaoli Wang Yiguang Hong Zhong-Ping Jiang Key Laboratory of Systems and Control Institute of Systems Science Chinese Academy and Sciences Beijing China Department of Electrical and Computer Engineering Polytechnic Institute of New York University Brooklyn NY USA

In this paper, we consider finite-time tracking problems of a moving target by multiple mobile agents. The mobile agents with global sensing areas and limited actuation region are designed to track down a target with estimation error with the help of formation and coverage. In order to capture the target, its location and velocity are first estimated. With observer-based estimation and formation control, the group of agents can catch the target by a coverage tracking policy in finite time.

关键词： Target tracking Mobile agents Robot sensing systems Robot kinematics State estimation Estimation error control systems Power system reliability Power system modeling Collaboration

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