The stabilisation problem of linear, time-invariant, large-scale, composite systems with delays in the interconnections without any additional assumption on system structure are considered. It is shown basically that ...
The stabilisation problem of linear, time-invariant, large-scale, composite systems with delays in the interconnections without any additional assumption on system structure are considered. It is shown basically that time-delays in the interconnections do not create additional difficulties. The main results presented demonstrate that stabilisation control by the local memoryless state feedback for this class of systems is always possible.
The problem of robust controller design is addressed for a single-input single-output plant with a single uncertain parameter. Given one controller that stabilizes the nominal plant, the Youla-Kucera parametrization o...
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Motivated by the pole placement design techniques, linear polynomial (or diophantine) equations have become a popular design tool of control engineers. The paper presents the theory, properties, and computational algo...
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Motivated by the pole placement design techniques, linear polynomial (or diophantine) equations have become a popular design tool of control engineers. The paper presents the theory, properties, and computational algorithms for the equation ax + by = c in a tutorial manner. Recent results are presented on the parametrization of limited degreee solutions, of relatively prime solutions, and of solutions x, y such that y/x is proper rational. Parametric and non-parametric computational algorithms are discussed in detail. Motivées par les méthodes de placement des pôles, les équations linéaires polynomiales (ou Diophantine) sont de venue un outil mathématique polulaire parmi les automaticiens. Cette communication a pour but de présenter, d'une manière synoptique, la théorie et le calcul numérique liés à l' équation ax + by = c. Plusieurs résultats récents sont présentés, sur la paramétrisation des solutions x, y de degré borné, sur les solutions x, y premières entre elles et sur les solutions telles que le rapport y/x est rationnel et propre. Plusieurs méthodes de résolution de cette équation, paramétriques ou non, sont discutées en détail.
In order to apply a model based control strategy such as flexible recipes control to an industrial batch process, a model of the process dynamics is needed. This paper presents the modelling procedure for two such mod...
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In order to apply a model based control strategy such as flexible recipes control to an industrial batch process, a model of the process dynamics is needed. This paper presents the modelling procedure for two such models: a semi-empirical and an artificial neural network model. Both models predict precipitation rates of TiO 2 particles in an industrial hydrolysis process. Model properties and their prediction accuracy is compared. The artificial neural network is trained using the augmented training data set approach. A simulator has been designed to study the application Of flexible recipe instructions.
Two algorithms are proposed for evaluating the rank of an arbitrary polynomial matrix. They rely upon constant matrix rank evaluations and therefore are more reliable than already existing elementary polynomial operat...
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Two algorithms are proposed for evaluating the rank of an arbitrary polynomial matrix. They rely upon constant matrix rank evaluations and therefore are more reliable than already existing elementary polynomial operations techniques. Some applications are mentioned, such as polynomial null-space extraction or conditions of existence of solutions to matrix polynomial equations arising in control problems. Deux algorithmes sont proposés pour évaluer le rang d'une matrice polynomiale quelconque. Ils sont basés sur des évaluations de rangs de matrices constantes et sont donc plus fiables que les techniques déjà existantes d'opérations polynomiales élémentaires. Quelques applications sont mentionnées, comme l'extraction du noyau polynomial ou des conditions d'existence de solutions aux équations polynomiales matricielles provenant de problèmes de commande.
The problem of deadlock in a large class of re-entrant flowline systems is analysed. Based on a Petri net (PN) model, circular blocking is rigorously defined and shown to be equivalent to part-path deadlock. The analy...
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The problem of deadlock in a large class of re-entrant flowline systems is analysed. Based on a Petri net (PN) model, circular blocking is rigorously defined and shown to be equivalent to part-path deadlock. The analysis is performed in terms of circular waits. Coupling the PN marking transition equation with the matrix rule-based controller equation yields a dynamical system representation, a framework in which algorithms of polynomial complexity can be developed for computing the structures of deadlock analysis. This allows efficient dispatching with deadlock avoidance using a generalised kanban scheme.
A method of PID controller autotuning based on relay feedback control is described. Special attention is paid to the process structure and parameters estimation in the phase of reaching the desired operating point. Th...
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A method of PID controller autotuning based on relay feedback control is described. Special attention is paid to the process structure and parameters estimation in the phase of reaching the desired operating point. This may increase the method's robustness and also speed up the tuning procedure. The algorithm's validity is illustrated by some simulation results and an experimental result on a laboratory pilot plant. Il est decrit la mèthode du régulateur d'autoadaptation PID basée au système asservi à relais. L'attention particulierè est consacrée à l'estimation de la structure et des paramètres du procès à la phase dans laquelle on met le proces dans le point de fonetionnement dont on augmente la robustesse et la vitesse de l'autoadaptation. Nous avons presenté certains résultats de la simulation à l'ordinateur ainsi qu'à l'installation pilote qui attestent la validité des algorithmes élaborés.
Discrete digital algorithm based on pulse width modulation is presented. The algorithm is derived from continuous integral control algorithm. Paper gives method for calculating coefficients of the algorithm. Theoretic...
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Discrete digital algorithm based on pulse width modulation is presented. The algorithm is derived from continuous integral control algorithm. Paper gives method for calculating coefficients of the algorithm. Theoretical results are experimentally tested on certain electra-pneumatic servo system. Comparison of simulated and experimental results are presented. Dans cet ouvrage on a présenté l'algorythme digital discret, basé sur la modulation en large. L'algorythme est dérivé à partir de l'algorythme de commande intégral continu. Les résultats théoriques ont été vérifiés de façon expérimentale sur un système servo électro-pneumatique. On a présenté les résultats comparables obtenus par la simulation et l'experimentation.
A fuzzy autopilot for ship path control is proposed. Nonlinear model of a ship and a steering subsystem is used. The autopilot uses heading signal and yaw rate signal to produce a command rudder angle. The autopilot d...
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A fuzzy autopilot for ship path control is proposed. Nonlinear model of a ship and a steering subsystem is used. The autopilot uses heading signal and yaw rate signal to produce a command rudder angle. The autopilot does not use lateral offset from the nominal track. Input variable fuzzyfication, fuzzy associative memory rules and output set defuzzyfication are described. The influence of the shallow water effect during larger maneuver is analyzed.
The contribution demonstrates the robot gripper, whose compressive force is automatically controlled to inevitable minimal value, also namely in dynamic modes, when besides gravity force also a rank of other forces an...
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The contribution demonstrates the robot gripper, whose compressive force is automatically controlled to inevitable minimal value, also namely in dynamic modes, when besides gravity force also a rank of other forces and torques affect to the manipulated object.
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