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检索条件"机构=Department of automatic control and applied informatics"

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Lyapunov functions defined by Hölder p-norms for linear time-variant systems 10

Lyapunov functions defined by Hölder p-norms for linear tim...

引用

2009 10th European control Conference, ECC 2009

作者： Pastravanu, O. Matcovschi, M.H. Department of Automatic Control and Applied Informatics Technical University 'Gh. Asachi' Blvd. Mangeron 53A Iasi700050 Romania

ISBN: (纸本)9783952417393

For linear time-variant systems x(t) = A(t)×(t), we consider Lyapunov function candidates of the form Vp(x,t) = H(t)xp, with 1≤p≤∞, defined by matrix-valued functions, H(t): R+ → Rn×n, continuously differentiable and non-singular. We prove that the traditional framework based on quadratic Lyapunov functions represents a particular case (i.e. p=2 ) of a more general scenario operating in similar terms for all Hölder p-norms. We propose a unified theory where a Lyapunov function candidate Vp (x,t) is characterized by the properties of a solution H(t) of a matrix differential inequality (or, equivalently, matrix differential equation). For any p, 1≤p≤∞, such a differential inequality (equation) is expressed in terms of the matrix measure corresponding to the Hölder p-norm and generalizes the role played by the classical Lyapunov differential inequality (equation) well-known for p=2. Our approach allows the construction of four distinct types of Lyapunov functions, providing criteria for testing stability, uniform stability, asymptotic stability and exponential stability. Finally we discuss the diagonal-type Lyapunov functions and the associated differential inequalities (equations) that are easier to handle because of the diagonal form of H(t). © 2009 EUCA.

关键词： Lyapunov functions

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Predictive control for time-varying delay in Networked control Systems

Predictive control for time-varying delay in Networked Contr...

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作者： Caruntu, C.F. Lazar, C. Department of Automatic Control and Applied Informatics Gheorghe Asachi Technical University of Iasi Blvd. Mangeron nr. 53 A 700050 Romania

ISBN: (纸本)9783902661678

Network delay is the main factor that deteriorates the performance of Networked control Systems (NCSs). In order to compensate the effects of the variable time delay induced in a NCS, two new methods based on a Predictive control Strategy are proposed in this paper. It is assumed that the delays in the communication network are bounded and, either an average value of these delays, or a model that estimates the system including the delays in the communication network is used in order to apply the predictive control algorithm. The performances of the proposed methods are demonstrated by simulation results and corresponding comparisons prove the significance of these methods. Copyright © IFAC 2009.

关键词： Networked control systems

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Pattern recognition for holonic manufacturing systems 10

Pattern recognition for holonic manufacturing systems

引用

2009 10th European control Conference, ECC 2009

作者： Ferariu, L. Panescu, D. 'Gh. Asachi' Technical University of Iasi Department of Automatic Control and Applied Informatics Bd. Mangeron 53A Iasi700050 Romania

ISBN: (纸本)9783952417393

The paper addresses to the pattern recognition problem within the framework of holonic manufacturing systems. A novel methodology with enhanced adaptation capabilities devoted to features extraction is suggested. It involves a flexible genetic selection of relevant features, in accordance with the specific properties of the patterns that have to be recognized. The competing features are determined by means of principal component analysis, bi-dimensional Fourier transformation and grey-levels analysis. The problem is formulated as a multi-objective optimisation, addressing to both classification accuracy and parsimony. The experimental results reveal the improvement of overall performances of the pattern recognition subsystem. © 2009 EUCA.

关键词： Multiobjective optimization

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Dynamic simulation model for a steam drum boiler system 10

Dynamic simulation model for a steam drum boiler system

引用

2009 10th European control Conference, ECC 2009

作者： Halauca, Cristina Lazar, Corneliu Gh. Asachi Technical University of Iasi Department of Automatic Control and Applied Informatics D. Mangeron str no. 53A Iasi700044 Romania

ISBN: (纸本)9783952417393

Dynamic modeling of a steam generation system is necessary for analyzing the power plant and for control design studies. The paper presents a nonlinear dynamic simulation model based on the physical properties of water and steam with their different mass and energy balance equations. The developed dynamic model was used to build up a drum boiler simulator for the typical Romanian steam boilers from a power plant being in use in the Iasi area. The model has been validated in open loop system, using data from tests carried out on the actual plant. Open-loop studies include comparisons between simulation results and real plant data. The work also shows the application problems that arise when implementing three types of control strategies to an actual steam drum boiler. © 2009 EUCA.

关键词： Engines

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Nonlinear system identification by means of genetic programming 10

Nonlinear system identification by means of genetic programm...

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2009 10th European control Conference, ECC 2009

作者： Patelli, A. Ferariu, L. 'Gh. Asachi' Technical University of Iasi Romania Department of Automatic Control and Applied Informatics Bd. D. Mangeron 53 A Iasi700050 Romania

ISBN: (纸本)9783952417393

The paper presents a novel nonlinear identification procedure, able to select the structure and parameters of a model according to a data - driven approach. The methodology is based on genetic programming techniques. The tree-like encryption of potential models guarantees a good spread of possible solutions within the problem search-space. During the evolutionary loop, various nonlinear models, linear in parameters are generated. To increase the convergence speed, the algorithm makes use of customized genetic operators and a local optimization procedure, based on QR decomposition. The experimental trials have proven that the approach is able to provide compact and accurate models, even when poor a priori information about the model structure is available. © 2009 EUCA.

关键词： Genetic programming

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Modeling of a pressure reducing valve actuator for automotive applications

Modeling of a pressure reducing valve actuator for automotiv...

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IEEE Conference on control Technology and Applications (CCTA)

作者： A. E. Balau C. F. Caruntu D. I. Patrascu C. Lazar M. H. Matcovschi O. Pastravanu Automatic Control and Applied Informatics Department Technical University Romania

Significant research effort has been directed towards developing vehicle systems that reduce the energy consumption of an automobile and because pressure control valves are used as actuators in many control applications for automotive systems, a proper dynamic model is necessary. Starting from equations found in literature, where a single stage pressure reducing valve is modelled, in this paper, the concept of modeling a real three land three way solenoid valve actuator for the clutch system in the automatic transmission is presented. Two simulators for an input-output model and a state-space model were developed and these were validated with data provided from experiments with the real valve actuator on a test bench.

关键词： Valves Actuators Automotive applications Pressure control Energy consumption Automobiles automatic control Automotive engineering Vehicle dynamics Equations

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On the Design and Implementation of Holonic Manufacturing Systems

On the Design and Implementation of Holonic Manufacturing Sy...

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Computer Science and Information Engineering, CSIE, WRI World Congress on FLAGGED

作者： Doru Panescu Marius Sutu Carlos Pascal Department of Automatic Control and Applied Informatics Gheorghe Asachi Technical University of Iasi Romania

Some points regarding the design and implementation of holonic manufacturing systems are presented. As the holonic approach supposes a distributed architecture regarding both planning and execution, certain methods and techniques of multi-agent systems can be used. These need specific adaptations, and the paper is focused on describing how the planning solution is conceived in order to obtain the proper coordination in the holonic system and the way communication can be solved using a CORBA based service oriented architecture. The proposed scheme is exemplified in the case of the resource holonspsila materialization. The developed architecture was tested on a manufacturing system with real industrial equipment. The respective system and the considered manufacturing scenarios constitute a valuable testbed for the validation of the holonic method.

关键词： Manufacturing systems Service robots Manufacturing industries Robot kinematics Robotic assembly System testing Machine tools Multiagent systems Manufacturing processes control systems

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On the Sensorial Integration for a Holonic Manufacturing System

On the Sensorial Integration for a Holonic Manufacturing Sys...

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Computer Modeling and Simulation, EMS, UKSIM European Symposium on FLAGGED

作者： Doru Panescu Gabriela Varvara Department of Automatic Control and Applied Informatics Gheorghe Asachi Technical University of Iasi Iasi Romania

The paper proposes a new method for sensorial integration within manufacturing systems. The control scheme is a holonic one, namely a PROSA reference architecture is considered. Some principles regarding the way the coordination and planning mechanisms have to be adapted for an enhanced sensorial integration are investigated. These refer a plan-space planning approach that operates with partially specified plans, and an extended form of the contract net protocol used to manage the holons' agents cooperation activities. The agent based implementation, which was made in the Jack software environment, was a further support for the sensorial information use by the holonic system deliberative components.

关键词： Manufacturing systems Protocols Lifting equipment Communication system control Computer aided manufacturing Computational modeling Computer simulation informatics automatic control Contracts

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On the design and implementation of the resource holons in a PROSA based architecture

On the design and implementation of the resource holons in a...

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IEEE International Conference on Intelligent Engineering Systems (INES)

作者： D. Panescu G. Varvara C. Pascal M. Sutu Department of Automatic Control and Applied Informatics Gheorghe Asachi Technical University of Iasi Iasi Romania

The holonic manufacturing systems represent both a modern approach to the manufacturing control problems and an open research area. The present contribution aims at establishing some design and implementation points regarding the resource holons in a PROSA based architecture. The proposed scheme makes use of JACK agents, which have their execution model appropriately adapted. The developed approach was tested on a manufacturing system with real industrial equipment, allowing a few conclusions to be derived.

关键词： Service robots Manufacturing systems Manufacturing industries Manufacturing processes Robotic assembly Robot control control systems System testing Electrical equipment industry informatics

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Image moments based visual control algorithm for servoing systems

Image moments based visual control algorithm for servoing sy...

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IEEE International Conference on Intelligent Computer Communication and Processing (ICCP)

作者： Cosmin Copot Adrian Burlacu Corneliu Lazar Department of Automatic Control and Applied Informatics Gheorghe Asachi Technical University of Iasi Iasi Romania

In this paper an approach to visual control robot manipulator using image moments is presented. The main part of any image based control system, the interaction matrix, is derived using image moments. A Matlab implementation of the image based control algorithm, tests and validation are presented. Stages were conducted using synthetic images and also real ones. An ABB robot with 6 degrees of freedom and an eye-in-hand camera configuration was considered to run the experiments in real time. The results show that the image moments have high performance in visual servoing applications.

关键词： control systems automatic control Manipulators Cameras Visual servoing Motion control Robot control Robot vision systems Error correction informatics

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