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IMTC'05 - Proceedings of the IEEE Instrumentation and Measurement Technology Conference

作者： Marcu, Marius Moldovan, Horatiu Zilahi, Mihai Tomescu, Victor Ionas, Mihai Department of Computer and Software Engineering Politehnica University of Timisoara Faculty of Automation Control and Computer Science 2 V. Parvan Timisoara Romania

ISBN: (纸本)0780388798

Windows operating systems (NT, 2000, XP, 2003) were not designed for real-time and time-critical applications. But, due to the market requirements, many of the monitoring and control applications are to use Windows NT based operating systems. One of the most important parameter in almost all applications is temperature. Therefore, this article addresses the problem of temperature monitoring using a non real-time operating system, like Windows. A number of three solutions for thermal sensors connecting to PC's interfaces are presented. © 2005 IEEE.

关键词： Real time systems

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Predictive control of a process with variable dead-time

Predictive control of a process with variable dead-time

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作者： Cristea, Smaranda De Prada, César De Keyser, Robin Department of Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid c/ Real de Burgos s/n Spain Department of Control Engineering and Automation University of Ghent Technologiepark-Zwijnaarde 9 B-9052 Ghent Belgium

ISBN: (纸本)008045108X

This paper deals with the control of variable-delay processes, where the delay depends on the value of the manipulated variable, which results in a non-linear system difficult to control. As a reference process, the case of a heated tank where the controlled variable is the liquid temperature and the placement of the sensor introduce a transport delay in the control loop, has been considered. This challenging problem is approached from the perspective of predictive control, using the non-linear EPSAC controller. Copyright © 2005 IFAC.

关键词： Linear systems

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Real-time control of a binary distillation column using HGA fuzzy supervisory PI controllers

Real-time control of a binary distillation column using HGA ...

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IEEE International Conference on control Applications

作者： Worapradya, K Pratishthananda, S Department of Process Control and Automation Nakornthai Strip Mill Plc. Chonburi Industrial Estate 20230 Thailand Department of Electrical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand

ISBN: (纸本)0780393538

In this paper, a HGA fuzzy supervisory PI controller using hierarchical genetic algorithms is developed and implemented for controlling the top and bottom product quality of a nonlinear, multi-input multi-output binary distillation column when the disturbances enter the column in the form of the changes in feed flow rate. Two conventional PI controllers, one for the bottom product composition and another for the top product composition, are used together in a decentralized control scheme to per form dual composition control. Hierarchical genetic algorithms are used to derive the optimal number and shape of membership functions and fuzzy rules of a fuzzy supervisory system that adapts the parameters of the PI controllers. The real-time implementation results show the effectiveness of the proposed method.

关键词： MIMO systems PI control distillation distillation equipment fuzzy control genetic algorithms nonlinear control systems optimal control process control HGA fuzzy supervisory PI controllers binary distillation column hierarchical genetic algorithms multi-i Distillation columns PI control Genetic Algorithm (GA) Nonlinear control systems multiple input multiple output systems Fuzzy control Process control Distillation distilling Distillation apparatus Optimal control Real time control oversight

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High Precision Density Measurement with Coriolis Mass Owmeters

High Precision Density Measurement with Coriolis Mass Owmete...

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IEEE Instrumentation and Measurement Technology Conference

作者： K. Kolahi T. Schroder H. Rock Chair for Automation and Control Engineering Christian-Albrechts University Kiel Germany

Today Coriolis meters offer the best performance in mass flow measurement. For those applications, where accuracy, low pressure drop and good cleanability is needed, the single straight tube is the best alternative. The tubes oscillate in resonance and the resonance frequency provides information about fluid's density, which is besides mass flow also an important parameter for quality and process control. A shortcoming of Coriolis mass flowmeters for density measurement is the lack of a sophisticated compensation method taking into account the dependency of the resonance frequency on temperature, flowrate, pressure, viscosity etc. In fact several heuristic methods are in use to achieve good solutions to correct the density readings. However, these methods are complex, device specific and expensive. In this paper, a method is presented to overcome these drawbacks. It is based on a dynamic model of the mass flowmeter and allows for parameter identification of the measuring tube during operation. To be more specific, the effective spring constant of the oscillating tube is detected online. Using this result, the vibrating mass and subsequently the density of the fluid are calculated taking into account the resonance frequency

关键词： Density measurement Resonance Resonant frequency Fluid flow measurement Process control Temperature dependence Viscosity Fluid dynamics Parameter estimation Springs

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UML-PA AS AN engineering MODEL FOR DISTRIBUTED PROCESS automation

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IFAC Proceedings Volumes 2005年第1期38卷 129-134页

作者： Uwe Katzke Birgit Vogel-Heuser Automation and Process Control Engineering Faculty of Electrical Information and Media Engineering University of Wuppertal 42119 Wuppertal Germany

Common engineering approaches and modeling approaches from software engineering are brought together. For the domain of process automation an implementation oriented approach for an object oriented software development for heterogeneous distributed systems is introduced. Model elements for control are added to UML as well as small-scale patterns for plant automation. Besides large-scale patterns are introduced as well as implementational models. The adoption of UML regarding applied diagrams and stereotypes for process automation will be introduced and evaluated.

关键词： control applications of computer control system design modelling real time computer systems programmable logic controllers programming approaches object modelling techniques object oriented programming

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PCB testing using infrared thermal signatures

PCB testing using infrared thermal signatures

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IMTC'05 - Proceedings of the IEEE Instrumentation and Measurement Technology Conference

作者： Moldovan, Horatiu Marcu, Marius Vladutiu, Mircea Department of Computer and Software Engineering Politehnica University of Timisoara Faculty of Automation Control and Computer Science Postal Address 2 V. Parvan Timisoara Romania

ISBN: (纸本)0780388798

A Printed Circuit Board (PCB) testing method using infrared thermal signatures is presented. The concept of thermal signature for PCBs is introduced. Based on this concept, the testing method is able to classify the integrated circuits (ICs) on a PCB into a number of classes (e.g. functional - fault free, non-functional - faulty and less reliable - functional circuits with high current consumption). According with thermal signature of each IC on the PCB, the PCBs can be also classified in the same number of classes. The classification system is a feed-forward neural network that learns and classifies the information achieved from the infrared image. © 2005 IEEE.

关键词： Printed circuit boards

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Design and application of an engineering model for distributed process automation

Design and application of an engineering model for distribut...

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American control Conference (ACC)

作者： U. Katzke B. Vogel-Heuser Chair of Process Control Engineering Faculty of Electrical Information and Media Engineering University of Wuppertal Wuppertal Germany Chair of Process Control Engineering Wuppertal Germany

Common engineering approaches and modelling approaches from software engineering are brought together. For the domain of process automation an implementation oriented approach for an object oriented software development for heterogeneous distributed systems is introduced. Model elements for control are added to UML as well as small-scale patterns for plant automation. Besides large-scale patterns are introduced as well as implementational models. The adoption of UML regarding applied diagrams and stereotypes for process automation is introduced and evaluated.

关键词： Design engineering Design automation Object oriented modeling Unified modeling language Automatic control Hardware Real time systems Java Process control Centralized control

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Automatic code generation from a UML model to IEC 61131-3 and system configuration tools

Automatic code generation from a UML model to IEC 61131-3 an...

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International Conference on control and automation (ICCA)

作者： B. Vogel-Heuser D. Witsch U. Katzke Head of the Chair of Process Control Engineering faculty of electrical Information and media engineering University of Wuppertal Wuppertal Germany Chair of Process Control Engineering faculty of electrical Information and media engineering University of Wuppertal Wuppertal Germany

An agile software development approach for embedded systems has been transferred to automation and process control. With using UML 1.4, an approach was developed, which allows to generate IEC 61131-3 code from an UML-model and to import it into soft-PLCs, automatically. The generated IEC 61131 code consists of ST and SFC. Besides, the system architecture is part of the UML-model, which bridges the gap between hard and software engineering. This approach was evaluated by using a sorting machine and by automation experts. The work is embedded in a development of UML for process automation and usability test of UML with automation engineers.

关键词： Unified modeling language IEC standards automation Programming Embedded system Process control Computer architecture Bridges Software engineering Sorting

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Experimental investigations of a direct adaptive neurofuzzy controller

Experimental investigations of a direct adaptive neurofuzzy ...

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IEEE Conference on control Technology and Applications (CCTA)

作者： E.K. Nyarko N. Peric I. Petrovic Department of Automation and Process Control Faculty of Electrical Engineering University of Osijek Osijek Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

The control of dynamical systems with inherent non-linear characteristics has motivated research in non-linear control theory. Two main approaches to dealing with uncertainties in control systems design are adaptive and robust control. In this paper, discrete direct adaptive control of unknown non-linear SISO systems is considered. The controller is implemented using a fuzzy neural network. The control concept is tested on a laboratory pilot plant and compared to a standard discrete PID Takahashi controller

关键词： Programmable control Adaptive control control systems Nonlinear control systems control theory Uncertainty Adaptive systems Robust control Fuzzy neural networks Fuzzy control

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INTERVAL ANALYSIS AND NONLINEAR control OF WASTEWATER PLANTS WITH PARAMETER UNCERTAINTY

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IFAC Proceedings Volumes 2005年第1期38卷 55-60页

作者： H. Aschemann A. Rauh M. Kletting E.P. Hofer M. Gennat B. Tibken Dept. of Measurement Control and Microtechnology University of Ulm D-89081 Ulm Germany Chair of Automation/Control Engineering University of Wuppertal D-42119 Wuppertal Germany

This paper presents the successful application of interval arithmetics to a simplified activated sludge model that describes the reduction of biodegradable substrate in biological wastewater treatment. Reliable analysis of the steady-state behaviour as well as plant control have to account for the dominant uncertain system parameter given by the maximum specific growth rate of biomass. The proposed control strategy consists of nonlinear control of oxygen concentration using desired trajectories derived from interval evaluations of the uncertain steady-state substrate concentration. By this, plant operating costs can be significantly reduced resulting in superior plant efficiency.

关键词： Intervals nonlinearity uncertain dynamic systems flatness-based control water pollution

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