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23rd International Conference on Circuits, Systems, Communications and Computers, CSCC 2019

作者： Kubalcik, Marek Bobal, Vladimir Barot, Tomas Department of Process Control Tomas Bata University in Zlin Faculty of Applied Informatics Nad Stranemi 4511 Zlin76005 Czech Republic Department of Mathematics with Didactics University of Ostrava Faculty of Education Fr. Sramka 3 Ostrava70900 Czech Republic

Methods of the statistical induction have a significant role in the quantitative research. In a wide spectrum of research areas, the methods based on testing hypotheses have been frequently used. However, in the area of the process control, testing hypothesis has not been widely considered as an established tool for signal analyses, although signals in control loops are suitable for analysis by means of quantitative statistical methods due to their stochastic character. Particularly, a statistical paired comparison can be applied for analysis of control quality achieved with different control algorithms. This comparison can be based on a paired comparison of corresponding signals obtained with different or modified control algorithms. The aim of this paper is a proposal of incorporation of testing hypothesis to analysis of control quality. The analysis was performed on a strictly defined significance level 0.001, which is a standardly used value in technical applications. As an example was demonstrated analysis of control quality achieved with two versions of a predictive controller. Finally, achieved results of paired comparison using testing hypothesis are discussed. © 2019 The Authors, published by EDP Sciences.

关键词： Stochastic systems

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Analysis of modified optimization in multivarible predictive control with regards to control quality

International Journal of Mechatronics and Applied Mechanics

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International Journal of Mechatronics and applied Mechanics 2019年第5期2019卷 7-12页

作者： Kubalcik, Marek Bobal, Vladimir Barot, Tomas Department of Process Control Tomas Bata University in Zlin Faculty of Applied Informatics Nad Stranemi 4511 Zlin760 05 Czech Republic Department of Mathematics with Didactics University of Ostrava Faculty of Education Frani Sramka 3 Ostrava709 00 Czech Republic

Model predictive control (MPC) has been a widely researched strategy in the modern control theory. Various modifications of MPC are focused on improving of two subsystems – the predictor and the optimizer, which cooperate mutually on the receding horizon. In constrained predictive control, the optimization is a quadratic programming problem, which has to be solved numerically. Namely, in constrained multivariable MPC, the constraints and the multi-variability of the process cause excessive increasing of the computational complexity. Reducing of computational time and decreasing of a number of numerical operations are particularly desirable. This is the reason for efforts to modify algorithms of numerical optimization. These modifications can influence control quality. This paper deals with one modification of the Hildreth optimization method and accurate analysis of its impact to quality of control. For analysis of impact to control quality, descriptive statistical methods are frequently used;particularly, methods based on analysis of floating point operations are complemented with their regression analysis for expression of complexity function O. However, the regression analysis of these results belongs only to non-inductive statistical methods depending on particular measurements of a computational complexity. For purposes of increasing responsibility of control quality indicators, set of specific statistical methods aimed on testing hypotheses is recommended in this paper. Testing hypotheses can be applied with strictly defined significance level. Practical implementation of modified MPC algorithm is statistically analyzed in comparison with unmodified MPC using proposed set of particular statistical methods. © 2019, Cefin Publishing House. All rights reserved.

关键词： Quadratic programming

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Predictive control of the magnetic levitation model

Predictive control of the magnetic levitation model

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International Conference on process control (PC)

作者： Lukáš Rušar Adam Krhovják Vladimír Bobál Department of Process Control Faculty of Applied Informatics Tomas Bata University Zlin Czech Republic

This paper presents a possible way to control the a very fast nonlinear systems. The system of the magnetic levitation was chosen as an exemplar process. This is an example of the process with a sampling period in order of milliseconds. We chose a predictive control method to control this system. The state-space CARIMA mathematical model is used for prediction of the output values. This paper describes the magnetic levitation model, its linearization, prediction of the output values and a calculation of the control signal by using a predictor-corrector method which turned out to be the best solution out of the selected ones. The results compare several optimization methods to achieve the fastest calculation of the control signal. All of the simulation was done in Matlab.

关键词： Mathematical model Magnetic levitation Predictive control Predictive models Cost function MATLAB

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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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Ionic polymer-metal composite actuators: Investigation of parametric model based on electrical values 11th

Ionic polymer-metal composite actuators: Investigation of pa...

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11th World Congress on Computational Mechanics, WCCM 2014

作者： Dominik, Ireneusz Kaszuba, Filip Dwornicka, Renata AGH University of Science and Technology Department of Process Control Krakow Poland Cracow University of Technology Institute of Applied Informatics Krakow Poland

ISBN: (纸本)9783038355038

The aim of this paper is to present the results of laboratory research on Ionic Polymer- Metal Composite (IPMC), with measurements of electrical values (voltage and current) measured simultaneously with the displacement. The obtained values were used to investigate the possibility of parametric model building. The research is focused mainly on constant frequency sine wave voltage signals. Phase offsets between voltage, current and displacement for different frequencies are calculated. Envelope and mean values of the electrical values are also described. © (2015) Trans Tech Publications, Switzerland.

关键词： Conducting polymers

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Possible approaches of disturbance compensation of time-delayed systems using predictive control 29

Possible approaches of disturbance compensation of time-dela...

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29th European Conference on Modelling and Simulation, ECMS 2015

作者： Holiš, Radek Bobál, Vladimír Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin Nad Stráněmi 4511 Zlin76005 Czech Republic

ISBN: (纸本)9780993244001

Many processes in industry exhibit time-delay in their dynamic behavior. Time-delay is mainly caused by the time required to transport energy, information or mass, but it can be caused by processing time as well. There are also many cases when compensation of measurable disturbance is required. In light of these facts, the goal of this paper is to design predictive algorithm for control of time-delayed systems with the possibility of measurable disturbance compensation. Basically this paper deals with the essential principles of model predictive control (MPC), design process of the predictive controller, calculation of control law and identification of control process. Identification of control process is also an important part of MPC. The next section describes simulation and also real-time verification of designed regulator which was verified in MATLAB/SIMULINK. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： Time delay

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Application of constraints in predictive control of time-delay systems 29

Application of constraints in predictive control of time-del...

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29th European Conference on Modelling and Simulation, ECMS 2015

作者： Rušar, Lukáš Talaš, Stanislav Krhovják, Adam Bobál, Vladimír Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlin Nad Stráněmi 4511 Zlin76005 Czech Republic

ISBN: (纸本)9780993244001

In industry, there are cases where the controlled process includes time-delay and it is often necessary to limit its input, output or state variables. The aim of this paper is to design and verify a predictive controller that is able to control these processes. This paper generally describes the design process of the predictive controller-from the general characteristics of predictive control to the calculation method of the control law. The next section includes a simulation verification of this design for different process parameters. All simulation verification programs are implemented in MATLAB/Simulink. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： Time delay

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Predictive control with filtering of input and output variables 29

Predictive control with filtering of input and output variab...

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29th European Conference on Modelling and Simulation, ECMS 2015

作者： Kubalcik, Marek Bobal, Vladimir Tomas Bata University in Zlín Department of Process Control Faculty of Applied Informatics Nad Stráněmi 4511 Zlín76005 Czech Republic

ISBN: (纸本)9780993244001

The paper is focused on an implementation of a predictive controller with a colouring filter C in a disturbance model. The filter is often essential for practical applications of predictive control based on transfer function models. It is commonly considered as a design parameter because it has direct effects on closed loop performance. In this paper a computation of predictions for the case with the colouring polynomial is introduced. The computation is based on a particular model of the controlled system in the form of transfer function which is commonly used for description of a range of processes. Performance of closed loop system with and without the colouring polynomial in the disturbance model was compared. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： Polynomials

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Method of explicit predictive control in case of time-delayed heat system 29

Method of explicit predictive control in case of time-delaye...

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29th European Conference on Modelling and Simulation, ECMS 2015

作者： Talaš, Stanislav Bobál, Vladimír Krhovják, Adam Rušar, Lukáš Tomas Bata University in Zlin Department of Process Control Faculty of Applied Informatics T. G. Masaryka 5555 Zlin760 01 Czech Republic

ISBN: (纸本)9780993244001

This paper studies simulations of a possible appliance of an explicit form of the model predictive control method. Targeted system is a heat exchanger burdened with a time-delay. An approach is formulated within the MATLAB/SIMULINK development environment as well as the resulting simulation. The conclusion evaluates resulting system behaviour with focus on conditions in areas of practice benefiting from its use. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： Time delay

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Alternative approach to optimization in model predictive control using hill climbing algorithm 26

Alternative approach to optimization in model predictive con...

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26th DAAAM International Symposium on Intelligent Manufacturing and Automation, DAAAM 2015

作者： Antos, Jan Kubalcik, Marek Department of Process Control Faculty of Applied Informatics Tomas Bata University in Zlín nám. T. G. Masaryka 5555 Zlín760 01 Czech Republic

ISBN: (纸本)9783902734075

The term predictive control designates a class of control methods suitable for control of various kinds of systems. One of the major advantages of predictive control is its ability to do on-line constraints handling in a systematic way. The predictive control is based on the prediction of a system behavior using a model. Based on this prediction, it is possible to optimize the systems behavior by utilization of a cost function. Each of control variables may be limited thus creating a specific subspace within a cost function. This problem is computationally complex and must be solved in each sampling period by optimization algorithms. Various kinds of algorithms may be applied. This contribution is focused on an alternative approach to optimization by implementation of Hill Climbing algorithm. The motivation for this concept is an effort to find algorithms suitable for reduction of computational expenses. These algorithms might be applied for control of systems with faster dynamics.

关键词： Cost functions

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