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31st IASTED International Conference on Modelling, Identification, and control, MIC 2011

作者： Chalupa, Petr Novák, Jakub Bobál, Vladimír Tomas Bata University in Zlin Faculty of Applied Informatics Department of Process Control Nad Stranemi 4511 76001 Zlin Czech Republic

ISBN: (纸本)9780889868632

The paper is focused on identification and control of nonlinear servo system Amira DR300. The identification is performed using a black box approach. Several types of nonlinearities, which are present in the servo system, are described and presented. Results of several identification methods are compared and combined to obtain an optimal model for control design. The control algorithm is designed to cope with disturbance while respecting low expenses required for hardware and software equipments. A suboptimal control of a nonlinear servo system is proposed in the contribution. It is based on polynomial theory and was applied to laboratory servo system in realtime conditions.

关键词： Servomechanisms

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Modeling of hydraulic control valves

Modeling of hydraulic control valves

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13th WSEAS International Conference on Automatic control, Modelling and Simulation, ACMOS'11

作者： Chalupa, Petr Novak, Jakub Bobal, Vladimir Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin nam. T.G. Masaryka 5555 760 01 Zlin Czech Republic

ISBN: (纸本)9781618040046

The paper deals with development of a mathematical model of valves of a hydraulic system. A three tank laboratory model (Amira DTS200) was investigated and characteristics of its valves were measured and a process of creating a mathematical model of the valves is described in detail. Although the three tank system is a classical modeling task this paper focuses on nonlinearities which are present in real system and other differences between ideal mathematical model and real-time system. The valves contain hysteresis and other nonlinearities. Despite the fact that all valves the system is equipped with are of the same type, big differences were observed between their characteristics. The approach to modeling of the system is not restricted to the particular system but can be used for many real-time hydraulic systems.

关键词： Tanks (containers)

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Polynomial approach to robust control of unstable processes with application to a magnetic system

Polynomial approach to robust control of unstable processes ...

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13th WSEAS International Conference on Automatic control, Modelling and Simulation, ACMOS'11

作者： Gazdoš, František Dostál, Petr Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin nam. T.G. Masaryka 5555 760 01 Zlin Czech Republic

ISBN: (纸本)9781618040046

This paper exploits a relatively simple framework for robust control of unstable single input - single output processes. A linear model-based polynomial approach to control system design is utilized together with robust tuning of some of the closed-loop poles. The methodology is illustrated on the task of magnetic system stabilization with presence of both output and input disturbances.

关键词： Robust control

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Adaptive control of tubular chemical reactor

Adaptive control of tubular chemical reactor

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13th WSEAS International Conference on Automatic control, Modelling and Simulation, ACMOS'11

作者： Vojtesek, Jiri Dostal, Petr Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin nam. T. G. Masaryka 5555 760 01 Zlin Czech Republic

ISBN: (纸本)9781618040046

In this paper the simulation results of the adaptive control inside the tubular chemical reactor with counter-current cooling in the jacket is shown. The adaptive controller is based on the choice of the External Linear Model as a linear representation of the originally nonlinear system parameters of which are identified recursively. The polynomial method together with spectral factorization and pole-placement method satisfies the basic control requirements. The controller could be tuned via position of the closed-loop root. Although the system has strongly nonlinear behaviour the proposed controller provides good control results.

关键词： Chemical reactors

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Simulation verification of digital self-tuning control of systems with time-delay

Simulation verification of digital self-tuning control of sy...

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IASTED International Conference on applied Simulation and Modelling, ASM 2011

作者： Bobál, Vladimír Chalupa, Petr Dostál, Petr Novák, Jakub Tomas Bata University in Zlín Faculty of Applied Informatics Department of Process Control Nam. T. G. Masaryka 5555 760 01 Zlín Czech Republic

ISBN: (纸本)9780889868939

Time-delays (dead times) are found in many processes in industry. Time-delays are mainly caused by the time required to transport mass, energy or information, but they can also be caused by processing time or accumulation. The contribution is focused on a design of algorithms for self-tuning digital control for processes with time-delay. The algorithms are based on the some modifications of the Smith Predictor (SP). One modification of the SP based on the digital PID controller was applied and it was compared with designed controller based on polynomial approach. The program system MATLAB/SIMULINK was used for simulation verification of these algorithms.

关键词： Time delay

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The RDF foundry: Call for an initiative to build enhanced RDF resources for biological data integration 11

The RDF foundry: Call for an initiative to build enhanced RD...

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Proceedings of the International Conference on Web Intelligence, Mining and Semantics

作者： Venkatesan, Aravind Blondé, Ward Antezana, Erick Skillingstad, Mats Marshall, M. Scott De Baets, Bernard Mironov, Vladimir Kuiper, Martin Department of Biology Høgskoleringen 5 7491 Trondheim Norway Ghent University Department of Applied Mathematics Biometrics and Process Control Coupure links 653 9000 Ghent Belgium Informatics Institute University of Amsterdam Netherlands

ISBN: (纸本)9781450301480

Currently, the OBO Foundry plays an important role by setting guidelines to formalise the concepts within the biomedical domain. The ontologies within the OBO Foundry are usually represented in the OBO ontology language. While being human-readable, this language lacks the computational rigour required for the Semantic Web (SW). Consequently, the RDF and OWL languages, both fundamental components of the SW technology stack, are being increasingly adopted by the biomedical community to exchange biological knowledge in a computer intelligible form. Some of the OBO- formatted ontologies have been made available in OWL, thus signalling a move towards the SW. OWL provides support for automated reasoning, which is its raison d'être. Unfortunately, automated reasoning on the massive volumes of data that are typical of the biomedical domain is riddled with performance limitations. Due to consistent support for the SPARQL specification in triple store implementations, as well as the ability to simulate some types of reasoning with pre-computed closures, RDF has evolved into a language of choice for knowledge exchange within the framework of the SW. Here, we discuss the need to establish a foundry charged with the task of harmonizing biomedical RDF resources, acting along the same lines as the OBO Foundry. To substantiate the need for an RDF Foundry, we provide the outcome of a small survey we have conducted to highlight the domain coverage, redundancies, and comprehensiveness of results obtained from a few representative distributed resources available today. © 2011 ACM.

关键词： Data integration

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Adaptive control of nonlinear servo system with disturbance rejection

Adaptive control of nonlinear servo system with disturbance ...

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Mediterranean Conference on control and Automation (MED)

作者： V. Bobál P. Chalupa M. Kubalčík P. Dostál Faculty of Applied Informatics Department of Process Control Tomas Bata University Zlin Czech Republic

The contribution is focused on a design of a control algorithm for a nonlinear servo system with disturbance rejection using adaptive control strategy. It is obvious that for a rejection of the measurable disturbance is a suitable control strategy based on polynomial approach. The regression (output error) models are used in the identification part, the parameter estimates of the process and disturbance models were computed using the least squares method extended by a directional (adaptive) forgetting. The controller synthesis is based on polynomial theory - pole assignment method. The designed controller was applied to a laboratory servo system Amira DR300 in real-time conditions.

关键词： Polynomials Friction Steady-state Mathematical model Laboratories Adaptation models control systems

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Adaptive control of Continuous-Stirred Tank Reactor in two stable steady-states

Adaptive control of Continuous-Stirred Tank Reactor in two s...

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10th IFAC International Workshop on Adaptation and Learning in control and Signal processing, ALCOSP 2010

作者： Vojtesek, Jiri Dostal, Petr Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin Czech Republic

ISBN: (纸本)9783902661852

The paper deals with the adaptive control of the nonlinear process represented by the Continuous Stirred Tank Reactor (CSTR). This type of reactor belongs to the class of systems with lumped-parameters. Mathematical model of this system consist of two nonlinear Ordinary Differential Equations (ODEs). The steady-state analysis uncovers two stable and one unstable operating points. Used adaptive approach is based on recursive identification of the system's parameters during the control. A polynomial approach used for the controller synthesis has satisfied control requirements and moreover, it could be used for systems with negative properties such as nonlinearity, non-minimum phase etc. The goal of this work is to compare control for two stable steady-states. © 2010 IFAC.

关键词： Chemical reactors

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control of heat exchanger using predictive approach

Control of heat exchanger using predictive approach

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29th IASTED International Conference on Modelling, Identification and control, MIC 2010

作者： Champa, Petr Novák, Jakub Bobál, Vladimír Tomas Bata University in Zlin Faculty of Applied Informatics Department of Process Control Nad Stranemi 4511 76001 Zlin Czech Republic

Heat exchange is a classical thermal process which occurs in a wide range of industrial technologies, particularly in the energetic and chemical industry. The paper is focused on a problem of production of liquid (water) with a given temperature course in time. Heating or cooling of inflow water is realized by a heat exchanger which is equipped with heating element and a spiral tube which can serve as a cooling element. The water inside the exchanger can serve as a tank for various chemical or technological operations. The need for tempered water is quite common in many industry branches. From the control point of view, the controlled system is asymmetrical;it has two inputs (cooling and heating) and one output - temperature of water inside the exchanger. A set of predictive controllers were designed to cope with the problem and these controllers were verified and compared by a realtime control of Multifunction process control Teaching System (MPCTS) - the Armfield PCT 40.

关键词： process control

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Adaptive control of Continuous-Stirred Tank Reactor in Two Stable Steady-States

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IFAC Proceedings Volumes 2010年第10期43卷 180-185页

作者： Jiri Vojtesek Petr Dostal Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin Czech Republic (Tel: ***

关键词： Chemical reactor adaptive control delta model parameter estimation polynomial method

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