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On the Orthogonal Collocation and Mathematical Programming Approach for State Constrained Optimal control Problems

IFAC Proceedings Volumes 1985年第2期18卷 218-218页

作者： O.E. Abdelrahman B.M. Abuelnasr Department of Mathematics and Computer Science Zagazig Univ. Egypt. New on a leave at the control Eng. Dept. Sheffield Univ England Department of Computer science and Automatic Control Univ. of Alexandria Alexandria Egypt

The orthogonal collocation approach is now well known to solve, effectively, the state constrained optimal control problems. Mathematical programming technique was also used as an effective tool to construct the optimal trajectories. In this paper, a study is done on the efficiency and accuracy requirements of the combined orthogonal collocation and mathematical programming approach, as regarding the employed optimization algorithm, and the number of orthogonal collocation points. It is shown, by experimentation with numerical examples that Fletcher-Powell optimization algorithm is much more faster to produce convergence than Fletcher-Reeves algorithm. The efficiency can be a ratio of six-to-one. The results are compared with an alternative approach to solve the same problem. It is shown that the present algorithm is less costly than the alternative approach, although requiring more computation time. The choice is then a compromise one. As the number of orthogonal points increases, the resulting solutions are more accurate, but the convergence speed decreases. Experimentation with N, shows a save of five-to-one in computing time can be achieved with almost the same cost function. Finally, it is shown, by a numerical example, that uniformly distributed collocation points result in non-optimal solutions, which also violate the problem constraints. It is a numerical proof of the superiority of the orthogonal collocation approach.

关键词： Orthogonal collocation mathematical programming optimization algorithms convergence speed state constrained problems

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Considerations on the disturbance attenuation problem for PI/PID controllers for a generic load disturbance dynamics

Considerations on the disturbance attenuation problem for PI...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： R. Vilanova V. M. Alfaro A. Visioli M. Barbu Deptartment of Telecomunications and Systems Engineering Universitat Autonoma Barcelona Bellaterra Barcelona Spain Departamento de Automática Universidad de Costa Rica San José Costa Rica Dipartimento di Ingegneria Meccanica e Industri-ale University of Brescia Via Brescia Italy Dept. Automatic Control and Electrical Eng. Dunarea de Jos University of Galati Galati Romania

Disturbance attenuation is often recognized as the primary concern of a control system. Regulation of the operating conditions is the usual task work to be pursued by a feedback controller. However, much of the academic works almost concentrate on set-point experiments for controller evaluation. Even those that explicitly concentrate on the disturbance attenuation problem, usually concentrate on input load disturbances. They exclude the specific, but usually not considered in the literature, case when the path from the disturbance to the controlled variable is different to the path from the controller output to the controlled variable. There are some process units such as heat exchangers or distillation columns where this situation may be encountered. However actual feedback controllers, usually of PI/PID type, do not take into account this situation. The point raised in this paper is that an increment of performance can be obtained if the information regarding the disturbance dynamics is included in the PI/PID design stage.

关键词： Process control Transfer functions Tuning Attenuation control systems Load modeling Adaptive control

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Client-server Mobile System for Diagnosis of Asynchronous Motors

Client-server Mobile System for Diagnosis of Asynchronous Mo...

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Advanced Technology (KhPIWeek), IEEE KhPI Week on

作者： Olha Chorna Petro Kurliak Victor Busher Oleksii Chornyi Valerii Tytiuk Iurii Zachepa Institute of Education and Science in Electrical Engineering and Information Technologies Kremenchuk Mykhailo Ostrogradskyi National University Kremenchuk Ukraine Department of Electrical power engineering electrical engineering and electromechanics Ivano-Frankivsk National Technical University of Oil and Gas Ivano-Frankivsk Ukraine Dept. of Electrical Engineering and Electronics National University “Odessa Maritime Academy” Odessa Ukraine Department of Electromechanics Kryvyi Rih National University Kryvyi Rih Ukraine Department of Systems of Automatic Control and Electric Drive Kremenchuk Mykhailo Ostrohradskyi National University Kremenchuk Ukraine

This paper presents client-server mobile system for diagnosis of asynchronous motors. The system is created as a mobile application for smartphones and tablets. The system provides processing of the measured values of the currents and voltages of the stator phases of the asynchronous motor. According to the processing results, the results of diagnostics and forecasting of the current state of asynchronous motors are calculated. The software runs on the Android OS. The main purpose is to predict the current state of AD, which has a parametric electromagnetic asymmetry of the stator phases.

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Human-centred intelligent systems and soft computing

British Telecom technology journal

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British Telecom technology journal 1998年第3期16卷 125-133页

作者： Azvine, B. Wobcke, W. Manchester University United Kingdom Dynamics and Control Research Group Engineering Department Manchester University United Kingdom Contr. and Instrum. Research Group Staffordshire University United Kingdom Intelligent Systems Research Group BT Laboratories United Kingdom Dept. of Engineering Mathematics Bristol University United Kingdom Europ. Netwk. Excellence U. University of Queensland Australia University of Essex United Kingdom Basser Dept. of Computer Science University of Sydney Australia

This paper considers the abstract features of human/machine interaction systems that are required for the production of intelligent behaviour. A conceptual architecture is proposed for a subset of intelligent systems called human-centred intelligent systems (HCISs) and it is argued that such systems must be autonomous, robust and adaptive in order to be intelligent. Soft computing is proposed as a promising new technique that can be used to build HCISs, and examples are presented where this is already being done. Finally, flexibility is defined to be a combination of the often-conflicting requirements of robustness and adaptability, and it is argued that the right balance between these two features is necessary to achieve intelligent behaviour.

关键词： Learning systems

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Spectroscopic detection of pigments in tissues: correlation with tissue aging and cancer development

Spectroscopic detection of pigments in tissues: correlation ...

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2022 International Conference Laser Optics, ICLO 2022

作者： Oliveira, L.M. Goncalves, T.M. Botelho, A.R. Martins, I.S. Silva, H.F. Carneiro, I. Carvalho, S. Henrique, R. Tuchin, V.V. Porto Portugal Center of Innovation in Engineering and Industrial Technology Isep Porto Portugal Department of Electrical and Computer Engineering Porto University-School of Engineering Porto Portugal Department of Pathology and Cancer Biology and Epigenetics Group Portuguese Oncology Institute of Porto Porto Portugal Porto Portugal Viana do Castelo Portugal Dept. of Pathol. and Molecular Immunology Porto University-Institute of Biomedical Sciences Abel Salazar Porto Portugal Science Medical Center Saratov State University Saratov Russia Laboratory of Laser Molecular Imaging and Machine Learning National Research Tomsk State University Tomsk Russia Laboratory of Laser Diagnostics of Technical and Living Systems Institute of Precision Mechanics and Control Frc-Saratov Scientific Centre-of the Russian Academy of Sciences Saratov Russia

ISBN: (纸本)9781665466646

The direct calculation of the absorption coefficient spectra of various tissues from spectral measurements allowed to retrieve the contents of melanin and lipofuscin. In the rabbit brain cortex, 1.8 times higher melanin content is explained by the neuron degeneration process. Similar melanin and lipofuscin contents were found in the rabbit pancreas as a result of the tissue aging process. The conversion of 83 % of the melanin in the human normal kidney into lipofuscin in the cancer kidney indicates that lipofuscin can be considered a kidney cancer marker in humans. © 2022 IEEE.

关键词： Tissue

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Letter to the Editor

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AIChE Journal 2004年第1期45卷

作者： Weidong Zhang Xiaoming Xu K. K. Tan Dept. of Automatic Control Shanghi Jiaotang Univ. Shanghai 20030 People'sRepublic of China Dept. of Electrical Engineering National Univ. of Singapore Kent Ridge 0511 Singapore

No Abstrast.

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Development of Firewall Optimization Model Using by Packet Filter

Development of Firewall Optimization Model Using by Packet F...

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International Conference on computer Modeling and Simulation, UKSIM

作者： Myo Thant Kyaw Zaw Ye Kyaw Myat Thu Si Thu Thant Sin Mandalay Division Defence Services Science and Technology Research Center PyiOoLwin Myanmar Department of Informatics and Computer Software System National Research University of Electronic Technology Zelenograd Moscow Russia Department of Automatic Control Systems Bauman Moscow State Technical University Moscow Russia Dept. of Comput. Sci. Nat. Res. Univ. of Electron. Technol. Zelenograd Russia

ISBN: (纸本)9781509008896

This paper studies one particular aspect of providing communication security: firewall technology. This article provides a security framework in the form of packet filtering model within the firewall technology system and its components can be designed and evaluated. This paper introduces a reference model based on packet filtering firewall technology. All components are governed by a centralized security policy and they can be deployed in a distributed fashion to achieve scaling. This packet filtering firewall design is proven technology that provides confidentiality, integrity and availability in own information and network resources. The required design implement to set-up packet filtering firewall for network to protect and unauthorized access to our network. We describe the filtering process design depends on its underlying network technologies. The resulting security mechanism can be used as a bastion-host in the construction of firewall system.

关键词： Computational modeling Filtering Transport protocols computers Informatics Software

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An environment for on-line multiobjective tuning of controllers

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IFAC Proceedings Volumes 1999年第2期32卷 8659-8663页

作者： P. Schroder I.A. Griffin P.J. Fleming B. Green N. Grum Dept. Automatic Control and Systems Engineering The University of Sheffield Mappin Street Sheffield S1 3JD UK Tel: +44 114 222 5250 Fax: +44 114 273 1729 Rolls-Royce and Associates Limited PO Box 31 Derby DE24 8BJ UK Tel: +44 1332 661 461 x5959 Fax: +44 1332 622 940.

A MATLAB-based rapid controller prototyping and development system for on-line tuning is presented. This is capable of automatically generating executable code for a digital signal processor from a Simulink specification of a controller and also has a real-time parameter adjustment and data logging facility. An optimisation problem can therefore be formulated in MATLAB with the controller parameters as decision variables and direct measures of the controller's performance as optimisation objectives. A multiobjective genetic algorithm is used as an optimisation engine to perform on-line tuning for the controller of an active magnetic bearing system. The optimisation objective function is based on on-line H ∞ and H 2 , measures of controller performance.

关键词： on-line controller tuning genetic algorithms multiobjective optimisation magnetic bearings

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On-Line Genetic Auto-Tuning of PID controllers for an Active Magnetic Bearing Application

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IFAC Proceedings Volumes 1998年第4期31卷 207-209页

作者： P. Schroder B. Green N. Gnum P.J. Fleming Dept. Automatic Control and Systems Engineering The University of Sheffield Mappin Street Sheffield S1 3JD UK. Tel +44 114 222 5250 Fax +44 114 273 1729 Rolls-Royce and Associates Limited PO Box 31 Derby DE24 8BJ UK. Tel: +44 1332 661 461 x5959 Fax: +44 1332 622 948

A prototype large electrical machine running on active magnetic bearings is described. This rig is controlled by a digital signal processor connected by a custom interface to MATLAB/Simulink hosted by a PC. The on-line tuning of a PID controller is set up as an optimisation problem from MATLAB and a multiobjective genetic algorithm is used to drive the optimisation. The results of an optimisation are presented and analysed.

关键词： magnetic bearings hardware-in-the-loop design on-line controller tuning genetic algorithms

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An interdisciplinary, interdepartmental control systems laboratory

IEEE Control Systems Magazine

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IEEE control Systems Magazine 2005年第1期25卷 50-55页

作者： Alleyne, Andrew G. Block, Daniel J. Meyn, Sean P. Perkins, William R. Spong, Mark W. Dept. of Mech./Industr. Engineering University of Illinois 1308 West Main St. Urbana IL 61801 United States Coll. of Eng. Control Systems Lab. University of Illinois 1308 West Main Street Urbana il 61801 United States Dept. of Elec./Computer Engineering University of Illinois 1308 West Main Street Urbana IL 61801 United States Department of General Engineering University of Illinois 1308 West Main Street Urbana IL 61801 United States

The existing U.S. Paradigm of individual departmental laboratories is increasingly difficult to justify due to the interdisciplinary nature of modern control engineering, the high cost and rapid obsolescence of technology, and the demands on faculty time. The College of engineering control Systems Laboratory (COECSL) at the University of Illinois advocates a shift from departmental labs to college labs for pedagogical, as well as financial, reasons. This approach is proving to be an effective approach to undergraduate control systems education.

关键词： control system synthesis

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