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European control Conference

作者： Z. Szabo J. Bokor Institute for Computer Science and Control Hungarian Academy of Sciences Institute for Computer Science and Control Hungarian Academy of Sciences MTA-BME Control Engineering Research Group

ISBN: (纸本)9781467371605

In order to design efficient algorithms that work on the set of controllers that fulfill a given property, e.g., stability or a norm bound, it is important to have an operation that preserves that property, i.e., a suitable blending method. While available approaches use the Youla parameters in order to define this operation for stability in a trivial way, they do not provide a general answer to the problem. This paper places the controller blending problem in a more general setting by pointing to the basic global geometric structures that are related to feedback stability or suboptimal H_∞ design. A detailed analysis is given for feedback stability: an operation is given under which well-posedness is a group while stability is a semigroup. Moreover, an operation is given that makes controllers with strongly stable property a group.

关键词： Geometry Stability analysis Aerospace electronics Transforms Algebra control theory Feedback loop

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Blending for H∞ performance: a group theoretic approach

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IFAC-PapersOnLine 2015年第14期48卷 186-191页

作者： Z. Szabò J. Bokor F. Schipp Institute for Computer Science and Control Hungarian Academy of Sciences Budapest Kende u. 13-17 Hungary Institute for Computer Science and Control Hungarian Academy of Sciences Hungary MTA-BME Control Engineering Research Group

In order to design efficient algorithms that work on the set of controllers that fulfill a given property, e.g., stability or a norm bound, it is important to have an operation that preserves that property, i.e., a suitable blending method. Concerning stability, a traditional approach is to use the Youla parametrization and the corresponding parameters as a starting point. While this method guarantees stabilizability as the invariant property for the fairly large class of strictly proper plants, there are also other solutions to the problem. The authors already provide a detailed analysis for feedback stability placing the controller blending problem in a general setting by pointing to the basic global geometric structures that are related to well-posedness and feedback stability. In this paper these efforts are continued and the group structure corresponding to performance problems, e.g., those related to a suboptimal H ∞ design, is presented. Besides its educative value the presentation provides a possible tool for the algorithmic development.

关键词： controller parametrisation controller blending performance guarantee

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Error Analysis and Optimality for a Two-Degree of Freedom control System

Error Analysis and Optimality for a Two-Degree of Freedom Co...

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IEEE International Symposium on Intelligent control (ISIC)

作者： L. Keviczky Cs. Banyasz Computer and Automation Research Institute and Control Engineering Research Group Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

Error properties of a generic two-degree of freedom control system is investigated. It is shown that there is a considerable difference between inverse stable and inverse unstable processes. New direct relationships are introduced for identification and optimization errors. For inverse unstable case these errors consist of systematic and random parts. The new results help to construct new algorithms for simultaneous robust identification and control

关键词： Error analysis Optimal control control systems Open loop systems Regulators Transfer functions Error correction Robust control Topology Automation

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Evaluation of H2 Optimality for Some Two-Degree of Freedom control Systems

Evaluation of H2 Optimality for Some Two-Degree of Freedom C...

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IEEE Conference on control Technology and Applications (CCTA)

作者： L. Keviczky Cs. Banyasz Computer and Automation Research Institute and Control Engineering Research Group Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The paper investigates the H 2 optimality of the realizability loss in a decomposition of the sensitivity function for open-loop stable Youla-parametrized generic two-degree of freedom (TDOF) control systems. Conditi... 详细信息

关键词： control systems Error correction Optimal control Automatic control Hydrogen Open loop systems Regulators Transfer functions Mathematical model Degradation

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Self Learning Fuzzy Logic control of Dissolved Oxygen Concentration in a Fermentation Process

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IFAC Proceedings Volumes 1998年第8期31卷 283-288页

作者： K.O. Jones D. Williams S.H. Ghwanmeh S.A. Caulder Control Systems Research Group School of Engineering Liverpool John Mores University Liverpool United Kingdom Computer and Control Department Hijjawi Faculty of Applied Engineering Yarmouk University Irbid Jordan

Biotechnological processes are notoriously difficult to control using conventional methods owing to their time-variant and non-linear characteristics. An alternative control method is to utilise artificial intelligence such as fuzzy logic. A problem with the development of fuzzy logic controllers is rule-base generation. A Self-Learning Fuzzy Logic control (SLFLC) methodology offers a possible alternative solution. A study is presented illustrating the performance of a SLFLC by demonstrating its ability to generate a rule-set based on a predetermined criteria. The SLFLC described has been successfully applied to simulations of a Bakers Yeast fed-batch fermentation. Results demonstrate how the learning mechanism produces a rule-set which controls the dissolved oxygen concentration throughout the fermentation process duration.

关键词： Dissolved oxygen fermentation processes fuzzy logic control self-learning simulation

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H-infinity, L-infinity optimal Youla regulators for two-degree of freedom control systems

H-infinity, L-infinity optimal Youla regulators for two-degr...

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Mediterranean Conference on control and Automation (MED)

作者： Cs. Banyasz L. Keviczky Computer and Automation Research Institute and Control Engineering Research Group Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The sensitivity function can be decomposed into three major parts: design-, realizability- and modeling-loss. The paper investigates the optimality of the second term in infinite norm spaces and proposes a new iterati... 详细信息

关键词： Automation Conferences

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Decoupling autopilot MIMO controller design

Decoupling autopilot MIMO controller design

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

作者： Bányász, Csilla Keviczky, László Dept. of Automation and Informatics Control Engineering Research Group of the H. Ac. of Sc. Computer and Automation Research Institute of the H. Ac. of Sc. Kende u 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9780889868632

The principal lateral motion of an aircraft is described by a minimum of fourth order coupled state variable model. It is interesting to investigate how a decoupling controller can be designed. The Youla-parametrization is a simple method to design controllers. The KB-parametrization is a successful extension of this method for two-degree-of freedom (2DOF) systems. The paper extends this methodology for multivariable case and applies to the decoupling lateral control.

关键词： controllers

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A Spiking Neural Network with Visible Light Communications 11

A Spiking Neural Network with Visible Light Communications

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11th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2018

作者： Hulea, Mircea Ghassemlooy, Zabih Rajbhandari, Sujan Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania Optical Communications Research Group Faculty of Engineering and Environment Northumbria University Newcastle United Kingdom Institute for Future Transport and Cities Coventry University United Kingdom

ISBN: (纸本)9781538613351

Spiking neural networks benefit from the real-time response when implemented using the analogue hardware since each electronic neuron operates independently from each other. The main problem of such neural networks is when the neural areas are non-static and are at a significant distance from each other. One solution to solve this problem is to use wireless based connectivity with parallel information transmission capability between neurons. This work presents the design and implementation of an all-optical synapse, based on the wavelength division multiplexed visible light communications between neurons, which has been adopted to overcome the problem of real-time weights adjustment. The results showed that by direct conversion of the electronic spikes into optical pulses, the spiking neurons are able to communicate through the optical channel with very low influence on the neural network normal spiking activity. © 2018 IEEE.

关键词： Neural networks

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Adsorption kinetics, isotherms and desorption studies of mercury from aqueous solution at different temperatures on magnetic sodium alginate-thiourea microbeads

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Environmental Nanotechnology, Monitoring and Management 2019年 12卷

作者： Patiño-Ruiz, D. Bonfante, H. De Ávila, G. Herrera, Adriana Doctorate in Engineering Program Nanomaterials and Computer Aided Process Engineering Research Group Universidad de Cartagena Cartagena Colombia Chemical Engineering Program Process Design and Biomass Use Group Universidad de Cartagena Cartagena Colombia Chemical Engineering Program Nanomaterials and Computer Aided Process Engineering Research Group Universidad de Cartagena Cartagena Colombia

Magnetite (Fe3O4) nanoparticles and thiourea were employed to modify sodium alginate microbeads for adsorption of Hg ions from aqueous solution. The Fe3O4 nanoparticles were initially synthesized by co-precipitation m... 详细信息

Magnetite (Fe₃O₄) nanoparticles and thiourea were employed to modify sodium alginate microbeads for adsorption of Hg ions from aqueous solution. The Fe₃O₄ nanoparticles were initially synthesized by co-precipitation method. Fourier infrared spectroscopy (FTIR) determined the presence of hydroxyl, carboxyl, thiol and amine functional groups in the microbead molecular structure. According to BET and BJH methods, the MAT microbeads had surface area, pore diameter and volume of 7.3472 m²/g, 12.9058 nm and 0.0255 cm³/g, respectively. Scanning electron microscopy (SEM) equipped with an EDX system allowed to obtain morphological information of the MAT microbeads, in which was observed the main elements introduced by the presence of thiol groups and iron ions. The result of saturation magnetization (M_s) performed by a vibrating sample magnetometer (VSM), is common for superparamagnetic materials, which slightly decreased due to the low amount of magnetic nanoparticles in the microbead structure. Adsorption kinetics showed that highest rate was about 98% in the first 20 min, and then decreased to zero. Pseudo-first order was the model that better fitted to experimental data with a value about 2.6 mg/g. Meanwhile, adsorption isotherm was better described using Langmuir model, suggesting that the Hg ions adsorption was mainly given by electrostatic interaction and chemical bonding among the functional groups, as well as the formation of a saturated layer onto the microbead surface occupying all the available sites. © 2019

关键词： Adsorption Magnetic nanoparticles Mercury Sodium alginate microbeads Thiourea

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computer-aids for modelling and conceptual design

Computer-aids for modelling and conceptual design

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IEEE International Conference on Systems, Man and Cybernetics

作者： P.C. Breedveld Electrical Engineering Department Control Systems and Computer Engineering Group Control Laboratory and Mechatronics Research Centre Twente University of Twente Enschede Netherlands

The author identifies incentives for the use of computer-aids in modelling and design of physical systems and discusses possible solutions.

The author identifies incentives for the use of computer-aids in modelling and design of physical systems and discusses possible solutions.< >

关键词： Systems engineering and theory Production control systems Mechatronics Physics computing Process design Digital simulation Cultural differences Mathematics control engineering computing

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