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A ring for description and control of time-delay systems

WSEAS Transactions on Systems 2012年第10期11卷 571-585页

作者： Pekar, Libor Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlin nam. T. G. Masaryka 5555 76001 Zlin Czech Republic

This contribution aims a revision and extension of the ring of retarded quasipolynomial meromorphic functions (RMS) for description and control of time-delay systems (TDS). The original definition has some significant drawbacks - especially, it does not constitute a ring. Our new definition extends the usability to neutral TDS and to those with distributed delays. As first, basic algebraic notions useful for this paper are introduced. A concise overview of algebraic methods for TDS follows. The original and the revised definitions of the ring together with some its properties finish the contribution. There are many illustrative examples that explain introduced terms and findings throughout the paper.

关键词： Delay control systems

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Study of non-stationary temperature fields in printed circuit boards during separation by cutting

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International Journal of Circuits, Systems and Signal Processing 2012年第1期6卷 122-129页

作者： Janacova, D. Charvatova, H. Kolomaznik, K. Vasek, V. Mokrejs, P. Dvorak, Z. Drga, R. Tomas Bata University in Zlín Faculty of Applied Informatics Department of Automation and Control Eigineering Nám. T. G. Masaryka 5555 760 01 Zlín Czech Republic

Nowadays, growth of electronic waste represents serious global problem. Therefore, ways of its recycling are searched. In the paper we deal with the printed circuit boards recycling. We focused on study of a cutting as an alternative method of conductive ways from plastic board separation as one of stages of the printed circuit board recycling procedure. For this purpose we formulated mathematic model of the cutting process and next we used its analytical solution for its modeling by mathematic software Maple. The obtained results confirm energy intensity of the cutting process.

关键词： Printed circuit boards

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Comparison of sensor configurations for mass flow estimation of turbocharged diesel engines

Lecture Notes in Control and Information Sciences

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Lecture Notes in control and Information Sciences 2012年 418卷 303-326页

作者： Polóni, Tomáš Rohal'-Ilkiv, Boris Alberer, Daniel Del Re, Luigi Johansen, Tor Arne Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology Bratislava Slovakia Institute for Design and Control of Mechatronical Systems Johannes Kepler University Linz Austria Department of Engineering Cybernetics Norwegian University of Science and Technology Trondheim Norway

ISBN: (纸本)9781447122203

The increasing demands on quality of power, emissions and overall performance of combustion engines lay new goals for the hardware and the software development of control systems. High-performance embedded controllers open the possibilities for application of numerical methods to solve the problems of modeling and control of combustion engines. Algorithms for estimation of state and parameters are essential components of many advanced control, monitoring and signal processing engine applications. A widely applicable estimator is given by the Extended Kalman Filter (EKF) which defines a finite memory recursive algorithm suited for real-time implementation, where only the last measurement is used to update the state estimate, based on the past history being approximately summarized by the a priori estimate of the state and the error covariance matrix estimate. The proposed EKF uses an augmented air-path state-space model to estimate unmeasurable mass flow quantities. The EKF algorithm based on the augmented state-space model considerably reduces the modeling errors compared to the open loop estimator simulation and compared to the EKF without the augmentation which is demonstrated on a standard production Diesel engine data. The experimental validation of the observed state quantities is performed against the measured pressures and turbocharger speed data. The estimated mass flow quantities are indirectly validated through the air compressor flow that is directly validated against air mass flow sensor data. Two two-sensor setups are considered in this study. In the first experiment the intake manifold pressure and the turbocharger speed is used. The second experiment uses the intake manifold pressure and the exhaust manifold pressure as the measurement information for the EKF. The second experiment gives more precise mass flow estimate in term of less bias on the estimates, but more variance due to the high frequency exhaust manifold pressure variations caused by the

关键词： Mass transfer

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Non-stepwise reference tracking for time delay systems

Non-stepwise reference tracking for time delay systems

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International Carpathian control Conference

作者： Pekař, Libor Prokop, Roman Dostálek, Petr Department of Automation and Control Faculty of Applied Informatics Tomas Bata University Zlín Czech Republic

ISBN: (纸本)9781612843599

This paper is focused on reference tracking and disturbance rejection for linear time-invariant time delay systems. The contribution is motivated by the fact that the task of reference tracking and disturbance rejection for non-stepwise those external inputs in the feedback loop is often ignored in the literature. The presented approach is based on algebraic operations in a special ring RMS and on the divisibility condition in the ring. The general idea for a feedback loop with two controllers is introduced. The methodology is clarified and verified by a simulation example in the Matlab/Simulink environment. © 2011 IEEE.

关键词： Disturbance rejection

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Validation heat transfer model by experimental measurement

Validation heat transfer model by experimental measurement

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International Carpathian control Conference

作者： Gerlich, Vladimir Department of Automation and Control Engineering Tomas Bata University in Zlin Faculty of Applied Informatics Zlin Czech Republic

ISBN: (纸本)9781612843599

The main idea of this project is to simulate the thermal construction responses in dependence on changing boundary conditions. In order to predict environmental temperature precisely a model of one room has been developed and implemented in COMSOL Multiphysics. A finite element model was developed in 3D coordinates in order to achieve illustration of an air and an energy movement and to simulate the transient process in the walls in [7]. Notwithstanding, this model was not accurate enough for application in building conditions. Main goal of this paper is in updating current model to get results with sufficient accuracy. Temperature course of the model is analyzed and compared to the experimentally measured temperature data. © 2011 IEEE.

关键词： Multiphysics

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Up to date issues on modeling the nervous control of the cardiovascular system on short-term

Up to date issues on modeling the nervous control of the car...

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作者： Codrean, Alexandru Korodi, Adrian Dragomir, Toma-Leonida Kovács, Levente Automation and Applied Informatics Department Politehnica University of Timisoara Timisoara Romania Department of Control Engineering and Information Technology Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9783902661937

Physiological control mechanisms are receiving an increasing amount of attention due to their primary role in homeostasis, while systems theory is becoming an indispensable tool for understanding the dynamic behaviors that emerge. In this context, a topic that has been intensively studied is the nervous control of the cardiovascular system on short term. This paper tries to develop a common framework for future efforts in modeling the nervous control of the cardiovascular system in orthostatic stress, through a systemic analyze of the roles and interactions of the regulatory mechanisms identified in the literature. © 2011 IFAC.

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Analysis of a simple quasipolynomial of degree one

Analysis of a simple quasipolynomial of degree one

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

作者： Pekař, Libor Prokop, Roman Department of Automation and Control Faculty of Applied Informatics Tomas Bata University in Zlin nam. T. G. Masaryka 5555 76001 Zlin Czech Republic

ISBN: (纸本)9781618040046

Systems with internal delays in feedback loops, so called time-delay or anisochronic ones, constitute a widespread family of industrial plants. Their linear representation in the form of the Laplace transform yields transfer functions expressed as ratios of quasipolynomials, instead of polynomials, with delay (exponential) terms in denominators. In this paper, detailed pole location analysis of a quasipolynomial of degree one is presented. This quasipolynomial is capable to express the dynamics of conventional high order systems, even without internal delays, as a model transfer function denominator. The presented analysis represents also a powerful tool for controller tuning in pole-placement control algorithms for delayed systems.

关键词： Transfer functions

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The Nyquist criterion for LTI Time-Delay Systems

The Nyquist criterion for LTI Time-Delay Systems

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

作者： Pekař, Libor Matušů, Radek Dostalek, Petr Dolinay, Jan Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlin nam. T. G. Masaryka 5555 76001 Zlin Czech Republic

ISBN: (纸本)9781618040046

This paper extends results about stability and stabilization of a retarded quasipolynomial obtained using the Mikhaylov criterion earlier. Retarded quasipolynomials appear as numerators and denominators of linear time-invariant time-delay systems (LTI-TDS). A LTI-TDS system of retarded type (destitute of distributed delays) is said to be stable if all roots of its characteristic quasipolynomial are located in the open left-half complex plane. The contribution transforms the formulation of spectrum assignment of a characteristic quasipolynomial into the language of the Nyquist criterion for the open loop of a control system. Again, the argument principle is utilized to derive generalized Nyquist criterion for LTI-TDS. Stability measures related to the criterion are discussed with the specifications for LTI-TDS. An illustrative example is presented to illuminate the results.

关键词： Stabilization

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Implementation and application of a simple real-time OS for 8-bit microcontrollers

Implementation and application of a simple real-time OS for ...

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作者： Dolinay, J. Vašek, V. Dostálek, P. Department of Automation and Control Engineering Tomas Bata University in Zlin Faculty of Applied Informatics Nad Stráněmi 4511 760 05 Zlín Czech Republic

ISBN: (纸本)9789604742769

This paper presents small real-time operating system which has been developed at our institute and also an application and practical verification of this system in a portable data acquisition unit. The system, named RTMON is intended mainly as a teaching aid for lessons of microcontroller programming where it allows the students to simply write applications in C language with several concurrently running processes. However, it can also be used in practical applications, as is demonstrated by the data acquisition unit described in this paper. The system works on 8-bit microcontrollers with the HC(S)08 core made by Freescale and also on Atmel AVR Mega8 microcontrollers.

关键词： Data acquisition

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An anti-slip predictive controller for a V-PRA vehicle

An anti-slip predictive controller for a V-PRA vehicle

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作者： Cochior, Carmen De Keyser, Robin Lazar, Corneliu Electrical Engineering Department Eindhoven University of Technology Eindhoven Netherlands EeSA-Department of Electrical Energy Systems and Automation Ghent University Ghent Belgium Department of Automatic Control and Applied Informatics Faculty of Automatic Control and Computer Engineering Technical University Gh. Asachi Iasi Romania

ISBN: (纸本)9783902661937

In this paper an anti-slip predictive controller is designed and implemented in order to control the rear wheels of a V-PRA (Variable Powered Rear Axle) vehicle. The control algorithm is EPSAC, a Model based Predictive control (MPC) strategy. It uses explicitly a model of the system for the prediction of the future system output, in order to calculate the optimal control input which will bring the system to a required setpoint. The main goals of this predictive controller were setpoint trajectory following, disturbance rejection and maintain overall the stability of the V-PRA vehicle. Although the process is nonlinear, being influenced by several parameters, linear discrete-time ARX models could be obtained based on system linearization around an operating point. An initial SISO controller was developed and tested, based on a Simulink model of the process. The control performances were tested successfully in presence of all kind of disturbances, denoting a robust controller. © 2011 IFAC.

关键词： Vehicles

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