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Two degrees-of-freedom hybrid adaptive approach with pole-placement method used for control of isothermal chemical reactor

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Chemical Engineering Transactions 2017年 61卷 1855-1860页

作者： Vojtesek, Jiří Prokop, Roman Dostal, Petr Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin Nad Stranemi 4511 Zlin76005 Czech Republic Department of Mathematics Faculty of Applied Informatics Tomas Bata University in Zlin Nad Stranemi 4511 Zlin76005 Czech Republic

Continuous Stirred-Tank Reactors (CSTR) are technological plants often used in the chemical or biochemical industry for the production of various types of chemicals. These systems are very complex from the control point-of-view - mainly because of their nonlinearity. controlling such processes by means of conventional methods that use controllers with fixed parameters;often produces bad - or even, unacceptable results. This is the right field for so-called "modern" control methods like Robust, Predictive, and Adaptive control. The control method used in this work is a hybrid adaptive control where the originally nonlinear system is represented by the external linear model whose parameters are recursively identified during the control phase. The pole-placement method with a spectral factorization and two degrees-of-freedom (2DOF) control configuration used in the control synthesis in order satisfy the basic control requirements, for instance: stability, reference signal tracking and disturbance attenuation. Moreover, the resulting controller obtained from the polynomial synthesis is easily programmable and be implemented in control computers. All of the proposed methods were tested by simulations on a mathematical model of an isothermal CSTR, with a complex reaction inside. The results so obtained, demonstrate the applicability of this control method for these kinds of processes. The team used the MATLAB simulation program in this research. Copyright © 2017, AIDIC Servizi S.r.l.

关键词： controllers

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Nonlinear Adaptive LQ control of a Tubular Chemical Reactor

Nonlinear Adaptive LQ Control of a Tubular Chemical Reactor

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International Conference on process control

作者： Petr Dostal Vladimir Bobal Jiri Vojtesek Centre of Polymer Systems University Institute Tomas Bata University in Zlin Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin

ISBN: (纸本)9781479909261

The paper deals with one possible control method of a tubular chemical reactor. The procedure is based on the decomposition of the controller on a nonlinear static part and an adaptive linear dynamic part. Derivation of the nonlinear static part uses inversion and subsequent polynomial approximation of simulated or measured steady-state characteristics of the reactor. The nonlinear part of the closed-loop composed of the nonlinear static part of the controller and nonlinear model of the reactor is then approximated by an external linear model with parameters recursively estimated via a corresponding delta model. The control law is obtained using the linear quadratic control theory.

关键词： Tubular chemical reactor Nonlinear model External linear model Delta model LQ control

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Surrogate Modelling of processes for Granular Material Thermal Treatment

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IFAC Proceedings Volumes 2006年第22期39卷 161-166页

作者： I. Koštial J. Terpák J. Mikula Department of Applied Informatics and Process Control BERG Faculty Technical University of Košice B. Němcovej 3 042 00 Košice Slovak Republic Phone: (+42155)6025177

Present advanced technologies creates increasingly complex engineering systems and the complexity of their engineering analysis advance at the same rate. In addition, the design and operation of complex engineering systems involves the integration of multiple disciplines and the resolution of conflicting objectives. Traditional parametric approach is inadequate to analyze these large-scale systems because of its computational inefficiency. Approximation techniques may be applied to build computationally inexpensive surrogate models for large-scale systems to replace expensive-to-run computer analysis codes. Numbers of approaches are existing. Response surface models are frequently utilized to construct surrogate approximations; however, they may be inefficient for systems having with a large number of variables. An alternative approach based on conceptual modelling for creating surrogate models is presented. A unified model for thermal processes is developed to compute thermal treatment of granular materials. The model does not require measurements but they can be useful for the model adjustment on specific situations or on its validation. A Databased modelling approach is used in order to keep at a minimum all the a priori assumptions on the physical mechanism driving the process formations. The motivation is to reduce computational expanse associated with use of simulation models needed to find good solutions. The model has been applied to replace of computationally expensive computer analyses.

关键词： Granular materials Thermal processes Modelling Approximation Methods Rotary furnace

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MULTIESTIMATION SCHEME FOR ADAPTIVE control OF THREE TANK SYSTEM

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IFAC Proceedings Volumes 2007年第13期40卷 151-156页

作者： Petr Navrátil Vladimír Bobál Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin Nad Stránemi 4511 760 05 Zlín Czech Republic fax : +420 57 603 5279

This paper deals with a one possibility of improvement of a self-tuning controller reliability and performance. A simple estimation scheme is replaced by so-called a multiestimation scheme and the self-tuning controller is then synthesized from this scheme. A higher level switching structure between various estimation schemes is used to supervise the reparametrization of the self-tuning controller in real time. The basic usefulness of the proposed scheme is to improve the accuracy of estimated parameters of the controlled system and then better transient response is obtained.

关键词： Self-tuning control Recursive estimation ARX models ARMAX models Recursive identification algorithms Multiestimation scheme

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Identification and Self-tuning Predictive control of Heat Exchanger

Identification and Self-tuning Predictive Control of Heat Ex...

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International Conference on process control

作者： Vladimir Bobal Marek Kubalcik Petr Dostal Centre of Polymer Systems University Institute Tomas Bata University in Zlin Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin

ISBN: (纸本)9781479909261

Heat exchange belongs to the class of basic thermal processes which occur in a range of industrial technologies, particularly in the energetic, chemical, polymer and rubber industry. The process of heat exchange is often implemented by through-flow heat exchangers. It is apparent that for an exact theoretical description of dynamics of heat exchange processes it is necessary to use partial differential equations. Heat exchange is namely a process with distributed parameters. It is also necessary to take into account its nonlinear and stochastic character. In spite of these facts, most of thermal equipment is controlled by digital modifications of PID controllers at present. This paper deals with identification of a dynamic behavior of a through-flow heat exchanger and a design of an self-tuning predictive controller for its control. The designed controller was verified by a real-time control of experimental laboratory heat exchanger.

关键词： Model predictive control Self-tuning control CARIMA model System identification Heat exchanger

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OPTIMAL control OF THE SINTERING process

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IFAC Proceedings Volumes 2005年第1期38卷 280-285页

作者： I. KoŜtial E. Dorĉák J. Terpák Department of Applied Informatics and Process Control BERG Faculty Technical University of KoŜice B. Nêmcovej 3 042 00 KoŜice Slovak Republic phone: (+42155)6025177

This paper describes the model based control system of the sintering process. The control includes ignition control, sintering control and exhaustion control. The mathematical models are derived from basic models of physical and chemical processes and use directly and indirectly measured quantities from sintering strand. The control system determines the optimal quantity of coke, volume of coke combustion air, preheating gas volume, combustion air for preheating and volume of exhausted gases. Values of these quantities are corrected according to the identified process state. Manipulated variable is the turbo-exhausters operating speed.

关键词： mathematical model simulation dynamic behaviour optimisation control

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Nonlinear gain scheduled controller for a sphere liquid tank 29

Nonlinear gain scheduled controller for a sphere liquid tank

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29th European Conference on Modelling and Simulation, ECMS 2015

作者： Krhovják, Adam Dostál, Petr Talaš, Stanislav Rušar, Lukas Centre of Polymer Systems University Institute Tomas Bata University in Zlin Nad Ovčirnou 3685 Zlín760 01 Czech Republic Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlín Nad Stráněmi 4511 Zlín760 05 Czech Republic

ISBN: (纸本)9780993244001

In this paper, we develop a gain-scheduled controller for a nonlinear plant of the sphere liquid tank. The proposed strategy is based on linearization of the nonlinear state equation around selected operating points. This methodology allows to apply any linear control design method. In particular, we discuss a polynomial method to achieve desired stability and performance requirements. Following this idea, both 1DOF and 2DOF control configurations are considered. The linear design methods are applied at each operating point in order to arrive at a set of linear control laws. Additionally, the parameters of the resulting family of linear controllers are scheduled as functions of reference variable, resulting in a single controller. Nonlocal performance of gain scheduled controller for the nonlinear model is checked by mathematical simulation. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： controllers

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Use of dynamic matrix control in simulation of heat system

Use of dynamic matrix control in simulation of heat system

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28th European Conference on Modelling and Simulation, ECMS 2014

作者： Talaš, Stanislav Bobál, Vladimír Krhovják, Adam Centre of Polymer Systems University Institute Tomas Bata University in Zlin T. G. Masaryka 5555 760 01 Zlin Czech Republic Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin T. G. Masaryka 5555 760 01 Zlin Czech Republic

ISBN: (纸本)9780956494481

This paper demonstrates the use of Model Predictive control (MPC) to system control. Dynamic Matrix control (DMC) method was chosen and its functionality was verified by a simulation of system control based on a real laboratory model. A control algorithm and the simulation were realized in MATLAB/SIMULINK program environment. Results have proven capabilities of DMC method to control stable oscillatory and nonminimum phase systems. Additionally, real model parameters were tested with a demonstration of a possibility of tuning by a ratio of weighting values form objective function. Proceedings 28th European Conference on Modelling and Simulation © ECMS Flaminio Squazzoni, Fabio Baronio, Claudia Archetti, Marco Castellani (Editors).

关键词： Model predictive control

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Design and Development of a Multifunction Device for Lead Acid Batteries

Design and Development of a Multifunction Device for Lead Ac...

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Circuits, Systems, Communications and Computers (CSCC), International Conference on

作者： Lubomír Macků František Gazdoš Martin Hlavizna Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlín Zlín Czech Republic MGM COMPRO Zlín Czech Republic

All machines rely on some source of energy and they are very often supported by batteries. Despite the newly developed Lithium-based batteries there is still a great number of applications where the lead acid batteries prevail. Moreover, according to some studies their usage will not drop significantly in the near future and may even grow. Therefore, there is and will be a demand for devices that would prolong their life-time and in this way contribute to sustainable materials, products and processes globally. This contribution presents one such device developed at the department of process control, Faculty of applied informatics, Tomas Bata University in Zlín, Czech Republic. It not only enables the complete care of lead acid batteries, including their capacity recovery, but it offers other functionalities as well. As our results indicate so far, the lost lead acid batteries capacity can be significantly recovered using this device and this recovered capacity can be also verified by the same device. The reached recovery can be even over 40 percent. This microcomputer-driven device is already patented and it is in the process of commercialization, however, its further development is not closed yet and other features, discussed in this paper, could be added in the close future by our team.

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ADAPTIVE control OF THREE - TANK - SYSTEM: POLYNOMIAL APPROACH

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IFAC Proceedings Volumes 2006年第2期39卷 367-372页

作者： Marek Kubalčík Vladimír Bobál Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin Mostní 5139 760 01 Zlin Czech Republic Tel.: +420 57 603 5198 Fax: +420 57 603 5279

control of a three – tank - system laboratory model as a two inputs – two outputs system is presented. The objective laboratory model is a multivariable nonlinear system. It is based on experience with authentic industrial control applications. Two control algorithms utilizing polynomial theory and pole – placement are proposed. Particular controllers are based on various configuration of the closed loop. The algorithms in adaptive version are then used for control of the model. The results of the real-time experiments are also included. Quality of control achieved by both methods is compared and discussed.

关键词： Polynomial methods Nonlinear system Self-tuning control Multivariable control Real-time control

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