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Computing and control engineering Journal 2003年第1期14卷 34-39页

作者： Müller, J. Uecker, F. Wollschlaeger, M. Diedrich, Ch. Epple, U. Dept. of Process Control Engineering RWTH Aachen Aachen Germany IFAK Institute of Automation and Commun. Magdeburg Germany

In the process industry, engineering functions for the administration and optimization of devices are gaining importance in comparison with process control functions. Thus, the term 'asset optimization' is often used to describe techniques that exploit the full potential of plant assets. This applies in particular to field devices used in production processes. This paper presents the asset management box (AMBOX) which is an open, configuration-free and manufacturer-independent access to field device functionality for the Profibus-PA Fieldbus, creating an additional information channel between field and plant control level.

关键词： Data communication systems

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Myoelectric signal classification based on its normalized power spectral density

Myoelectric signal classification based on its normalized po...

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Proceedings of the IASTED International Conference on Biomedical engineering

作者： Da Silva, L. Pinheiro Kassab Jr., F. Laboratory of Automation and Control Dept. of Telecom. Engineering University of São Paulo Brazil

ISBN: (纸本)0889863539

Many studies are realized aiming the control of prosthetic devices using the myoelectric signal acquired on the reminiscent member of the amputee. This work investigates the viability of myoelectric signal recognition by processing and analyzing the power spectral density of this signal. As shown in this text, the proper recognition of four distinct myoelectric signal classes was achieved using this methodology, being each of these classes associated to a different hand motion. Data were acquired using two dry surface electrodes placed on the forearm, and only the normalized power spectral densities of the signals were used during project and evaluation phases. The algorithm presented has been designed to allow real-time evaluation, for practical implementation feasibility. Moreover, since PSD normalization is evaluated before the recognition phase, every absolute value is discarded, allowing the algorithm to ensure some insensibility to impedance fluctuations occurring on the interfaces between the surface electrodes and the skin.

关键词： Prosthetics

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Modular modeling of roll-based calender manufacturing environments

Modular modeling of roll-based calender manufacturing enviro...

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2003 IEEE Conference on Emerging Technologies and Factory automation, ETFA 2003

作者： Gutzeit, Oliver Hanisch, H.-M. Dept. of Automatic Control LAE Engineering GmbH Wilhelmstrasse 2 Nussloch69226 Germany Dept. of Engineering Science Automation Technology Lab. Martin Luther University of Halle-Wittenberg Halle06099 Germany

ISBN: (纸本)0780379373

Models of plant behavior are required to use formal methods of manufacturing execution systems (MES) application development. We present a manufacturing oriented modular approach for designing such models. The approach is a first step towards a predictive simulation system for operator support in control of complex, hybrid manufacturing systems in the plastics industry. © 2003 IEEE.

关键词： Calenders

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Multispectral thermometry based on neural network

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Journal of Harbin Institute of Technology(New Series) 2003年第1期10卷 108-112页

作者：孙晓刚戴景民 Post doctor Station of Electrical Engineering Harbin Science and Technology University Dept. of Automation Measurement & Control Harbin Institute of Technology Harbin 150001 China Dept. of Automation Measurement & Control Harbin Institute of Technology

In order to overcome the effect of the assumption between emissivity and wavelength on the measurement of true temperature and spectral emissivity for most engineering materials, a neural network based method is proposed for data processing while a blackbody furnace and three optical filters with known spectral transmittance curves were used to make up a true target. The experimental results show that the calculated temperatures are in good agreement with the temperature of the blackbody furnace, and the calculated spectral emissivity curves are in good agreement with the spectral transmittance curves of the filters. The method proposed has been proved to be an effective method for solving the problem of true temperature and emissivity measurement, and it can overcome the effect of the assumption between emissivity and wavelength on the measurement of true temperature and spectral emissivity for most engineering materials.

关键词： multispectal thermometry emissivity neural networK

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Polymer coating of paper using dry surface treatment - Coating structure and performance

Polymer coating of paper using dry surface treatment - Coati...

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Proceedings of the 2003 TAPPI European PLACE Conference

作者： Putkisto, Kaisa Maijala, Juha Grön, Johan Rigdahl, Mikael Tampere University of Technology Institute of Automation and Control Paper Machine Automation Tampere Finland Metso Paper Inc. Surface Treatment Technology Järvenpää Finland Chalmers Univ. of Technology Dept. of Mat. Sci. and Engineering Gothenburg Sweden

The conditions and time scale of coating materials with the dry surface treatment (DST) differ significantly from the ones applied in conventional extrusion, solvent-based and dispersion coating. In DST, the coating and surface finishing are combined in steps of applying layers of dry coating particles onto a substrate, thereafter densifying and smoothening the surface layer during a thermomechanical fixing phase. First, an electric field is used to direct charged coating particles onto the surface, where the deposited layer attaches mainly electrostatically. Secondly, during the heating and compression phase, the polymer layer should exhibit sufficient flowability, deformability and affinity to the substrate surface in order to provide an adequate and homogeneous coating. The dwell time in the heated roll nip can be adjusted to give the polymeric particles sufficient time to sinter and homogenise throughout the layer by diffusion mechanisms. The layering, softening and immobilisation of the coating should be accomplished within milliseconds, where governing factors for example are particle size, thermal conductivity within the layer, and other polymer characteristics such as softening temperature and rheological behaviour. At low coat weights, a crucial requirement for obtaining a uniform and smooth coating with a sufficient covering ability is an even distribution of particles of a fine particle size, since large particles require longer time to flow sufficiently and level out. The heat treatment is ideally used for controlling the rheological behaviour of the polymer in order to achieve an adequate film formation and allow polymer penetration into the porous surface of the paper and thereby anchor the coating layer mechanically to the substrate and seal it. We studied the effects of the thermomechanical properties of the polymer and fixation conditions on the formed structure and performance of the coatings prepared in a laboratory scale dry surface treatment uni

关键词： Surface treatment

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Passive fault tolerant control of a double inverted pendulum - A case study example 5

Passive fault tolerant control of a double inverted pendulum...

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5th IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes, Safeprocess 2003

作者： Niemann, Henrik Stoustrup, Jakob ØrstedDTU Automation Technical University of Denmark Building 326 LyngbyDK-2800 Denmark Dept. of Control Engineering Aalborg University Fr. Bajers Vej 7C AalborgDK-9220 Denmark

A passive fault tolerant control scheme is suggested, in which a nominal controller is augmented with an additional block, which guarantees stability and performance after the occurrence of a fault. The method is based on the Youla parameterization, which requires the nominal controller to be implemented in observer based form. The proposed method is applied to a double inverted pendulum system, for which an H∞ controller has been designed and verified in a lab setup. In this case study, the fault is a degradation of the tacho loop. © 2003 International Federation of Automatic control.

关键词： Fault tolerance

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Thermomechanical properties of the polymer binder affecting the processability, structure and properties of dry surface treated papers

Thermomechanical properties of the polymer binder affecting ...

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Proceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium

作者： Putkisto, Kaisa Maijala, Juha Grön, Johan Rigdahl, Mikael Tampere Univ. of Technology Inst. of Automation and Control Paper Machine Automation Tampere Finland Metso Paper Inc. Surface Treatment Technology Järvenpää Finland Chalmers Univ. of Technology Dept. of Mat. Sci. and Engineering Gothenburg Sweden

ISBN: (纸本)1930657048

The dry surface treatment (DST) method differs significantly from the conventional pigment-coating processes. The coating layer is applied to the substrate in the form of dry powdery particles and fixed on the surface with a thermomechanical treatment in a heated nip. In DST, the wetting of the base substrate is avoided, coating application is done without contact with the substrate and immediately to the required coat weight without any intensive coating penetration into the substrate. In this paper we present the possibility to modify and control the structure and properties of the two-component (the coating system consists of pigments and a latex binder) dry surface treated papers. It was noted that processability in DST, as well as the properties of the coated paper, were significantly affected by the thermomechanical - the temperature dependent viscoelastic - properties of the latex binder. It appeared beneficial to have a high stiffness polymeric binder, particularly in the temperature region above its main (glass) transition, corresponding to a high gel content. This choice of binder decreased DST paper sticking to the heated roll during the fixation step of the coating and improved the surface strength of the final product. It was found that DST papers are in many respects comparable to conventionally wet-coated papers with similar amount and type of coating components. In the case of DST papers, the coating structure appeared however to be more open, especially with high gel latexes. This could be an important variable when adjusting to different printing methods, e.g. with or without drying capacity. Furthermore, coating penetration into the base paper was suppressed by employing the DST.

关键词： Surface treatment

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The asset management box

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IEE Computing and control engineering 2003年第1期14卷 34-39页

作者： Müller, J. Uecker, F. Wollschlaeger, M. Diedrich, Ch. Epple, U. Dept. of Process Control Engineering RWTH Aachen Aachen Germany IFAK Inst. of Automation and Commun. Magdeburg Germany

A separate PC connected to both the fieldbus and the plant network is described. Called AMBox, it allows asset management functions to be implemented in parallel with an existing control system. Furthermore, no changes to the installed control system are required. This paper discusses the implementation of AMBox functionality for fieldbus Profibus-PA;enhancements for different types of fieldbus are planned.

关键词： Communication systems

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A simulator for line-of-sight missile control and guidance systems: Object-oriented design

A simulator for line-of-sight missile control and guidance s...

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2003 IEEE Aerospace Conference

作者： Dimirovski, Georgi M. Mohenski, Darko D. Deskovski, Stoyce M. Dogus University Dept. of Computer Engineering and Information Technologies Acibadem Zeamet Sk. No: 21 Kadikoy TR-8 1080 Istanbul Turkey SS Cyril and Methodius University Institute of Automation and Systems Engineering at FEE Karpos 2 Rugjer Boskovic b.b. MK-1000 Skopje Macedonia Dept. of Information and Control Systems Military Academy of RM General M. Apostolski MK-1000 Skopje Macedonia

ISBN: (纸本)078037651X

A standard PC platform based simulator system for personnel training in anti-tank guided missile (ATGM) systems has been designed and implemented;its operation is managed through instructor-trainee interaction. It makes use of object-oriented simulation modeling, 6 degree-offreedom (6DOF) missile model and mask modeling of terrain and weather conditions. The main topic of research are the short-range and line-of-sight (CLOS) missiles as well as their guidance and control and target selection and tracking in combat situation. The simulation model specifications are built around the set of concurrent cooperating objects, including representation model of the system's environment. The set of compatible models and software implementations for missiles and moving ground targets, involving their interrelated kinematics, has been elaborated by own research entirely. An appropriate designed user-system interface employing Visual Basic enhances the instructor-trainee co-operation. Its significance stems fiom being usable for personnel training and simulating all typical combat situations given country's landscapes, and being amenable to adjustments to serve a combat command and control instrument if endowed with some hardware-in-the-loop (HIL) elements and interface to launching platform. In addition, it is aimed for investigating new tracking algorithms in multi-target environment. © 2003 IEEE.

关键词： Target tracking

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Thermomechanical properties of the binder affecting the fixing process and structure of dry surface treated (DST) papers

Thermomechanical properties of the binder affecting the fixi...

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5th International Paper and Coating Chemistry Symposium 2003

作者： Putkisto, Kaisa Maijala, Juha Grön, Johan Rigdahl, Mikael Tampere University of Technology Institute of Automation and Control PO Box 692 FIN-33101 Tampere Finland Metso Paper Inc. Surface Treatment Technology FIN-04400 Järvenpää Finland Chalmers University of Technology Dept. of Mat. Sci. and Engineering SE-41296 Gothenburg Sweden

The dry surface treatment (DST) provides a combined process for coating and smoothening a paper surface using a variety of materials in order to obtain the desired paper characteristics. By applying the coating materials in a dry powdery form and anchoring the coating layer to the paper surface in a subsequent thermomechanical fixing phase, the drawbacks related to the presence of water in conventional suspension coating can be avoided. In a simplest case, the DST coating contains two components, the pigment and the thermoplastic polymeric binder. The sintering and binding steps during the DST fixing phase should be completed within a timescale of milliseconds, which is markedly shorter than time available for consolidation and film forming in the case of conventional wet-coating. In DST, low binder elasticity at elevated temperatures and a mismatched combination of the fixation conditions can lead to coating sticking to the contacting heated roll. We have studied the effects of binder content, the viscoelastic properties of the binder and fixing conditions on the formed coating structure and surface strength of DST papers prepared at a laboratory scale. The effects of the thermomechanical properties of the polymeric binder are discussed in relation to the transient fixing process, in which the particle size and the temperature distribution in the coating layer during the fixing also are key factors.

关键词： Paper

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