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SIMULATION-BASED STABILITY-TESTS FOR DIFFERENTIAL UNIT MEMORY LINEAR MULTIPASS processES

INTERNATIONAL JOURNAL OF control 1990年第5期51卷 1051-1065页

作者： ROGERS, E OWENS, DH Department of Mechanical and Process Engineering Division of Dynamics and Control University of Strathclyde Glasgow Gl 1XJ Scotland U.K.

A simulation-based test for the stability along the pass of a differential unit memory linear multipass process is developed which is suitable for software implementation. Further, it is shown that this test produces, at no extra cost, information concerning the rate of approach of the output sequence to the limit profile in one special case of practical interest. Finally, the use of this unique feature in controller design is briefly discussed.

关键词： control systems, Linear

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Numerical analysis of a vortex flowmeter and comparison with experiment

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Flow Measurement and Instrumentation 1990年第2期1卷 106-112页

作者： Matsunaga, Y. Takahashi, S. Kuromori, K. Yokogawa Electric Corporation Process Control Systems Division Musashino-shi Tokyo 180 2-9-32 Nakacho Japan

The Strouhal number and flow profile of a two-dimensional vortex flowmeter were calculated, using numerical dynamics. They were compared with experimental results obtained by laser-Doppler velocity meter. The calculat... 详细信息

关键词： flow profile laser-Doppler velocity meter Strouhal number vortex flowmeter

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POTENTIAL FOR CHEMICALS FROM COAL

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FUEL 1990年第1期69卷 132-133页

作者： AGREDA, VH Process Systems Engineering Tennessee Eastman Co. Eastman Chemicals Division Eastman Kodak Co. PO Box 511 Kingsport TN 37662 USA

The following is a discussion of the potential for chemicals from coal, based on existing technology (proven or under development), and a likely scenario for the transition from oil (and natural gas) to coal as the primary feedstock. Oil shale and tar sands are also alternative feedstocks, but will not be discussed in this article. On a world scale, coal is the most important alternative fuel and chemical feedstock in terms of reserves, availability, commercial acceptance, and technology development. Furthermore, similar arguments and reasoning apply to the future emergence of other fossil fuels as significant alternative fuel and chemical feedstocks.

关键词： coal chemical characterization fuel

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Internal Model Adaptive control systems

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IFAC Proceedings Volumes 1990年第1期23卷 135-139页

作者： J. Guan L. Wang D.H. Owens Dynamics and Control Division Department of Mechanical and Process Engineering University of Strathclyde Glasgow UK

This paper gives a description of an internal model adaptive control system. Some performance robustness properties of non-adaptive internal model control system against modelling error and load disturbances are presented; these properties may be important for the adaptive control scheme. A stability robustness condition is given based on which a switch-on/off algorithm is developed.

关键词： Internal Model control(IMC) Scheme Adaptive control Robustness Stability

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Petri net analysis of a transfer-line protocol

Petri net analysis of a transfer-line protocol

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International Conference on Computer Integrated Manufacturing

作者： B.H. Krogh W.L. Genter Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Process Control and Manufacturing Technology Division Alcoa Technical Center Alcoa Center PA USA

Petri nets are applied to the bottom-up design of a handshaking protocol for transferring parts through a sequence of workstations. The authors illustrate the application of Petri-net theory to verify properties of the complete system behavior based on the structure of the Petri-net model. It is shown that communication between local controllers is modeled by places corresponding to upstream and downstream messages. Consistency in the interconnection of the subsystem models is guaranteed by the identification of these communication places. To analyze the properties of the complete system, results on liveness and place invariants for Petri nets are applied to the Petri-net model.< >

关键词： Protocols Workstations Petri nets Power system modeling Communication system control Algorithm design and analysis Computer aided manufacturing Virtual manufacturing Computational modeling System performance

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Long-Range Predictive control of Nonlinear systems on the Basis of the Hammerstein Model

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IFAC Proceedings Volumes 1990年第1期23卷 165-169页

作者： R. Bars R. Haber Department of Automation Technical University of Budapest Goldmann Gy. tér 3 Budapest Hungary Fachhochschule Köln Faculty of Plant and Process Engineering Köln FRG and Ruhr-University Faculty of Mechanical Engineering Department of Control Systems Bochum FRG

The unknown nonlinear process is approximated by the Hammerstein model, which is one of the natural expansions of the discrete convolution model to nonlinear systems· Because of the large number of the parameters an identification procedure with scalar convergence coefficients is recommended. The control task is to follow a reference model output predicted ahead in a given horizon· The present and future control activities during the prediction horizon are determined minimizing a functional of the error signal between the predicted values of the reference model and the system output. The control signal is assumed constant during the control horizon and the calculation is repeated in each control interval. Simulation results represent the robust behaviour of the control algorithms.

关键词： Nonlinear control systems predictive control nonparametric models adaptive control control theory

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Comparative analysis of RDBMS and OODBMS: a case study

Comparative analysis of RDBMS and OODBMS: a case study

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IEEE Compcon

作者： M.A. Ketabchi S. Mathur T. Risch J. Chen Department of Electrical Engineering & Computer Sciences Santa Clara University Santa Clara CA USA Data Management Systems Division Hewlett Packard Company Cupertino CA USA Database Technology Department/Stanford Science Center Hewlett Packard Laboratories Palo Alto CA USA Corporate Product Generation Process Department Hewlett Packard Company Palo Alto CA USA

The underlying hypothesis of the case study described is that the development, implementation, operations, and maintenance of large, complex, data-intensive applications, such as computer-integrated manufacturing, can be simplified through the use of object-oriented database management systems (DBMSs). The objective of the case study is to verify this hypothesis. The approach is to prototype selected representative components of a computer-integrated-manufacturing system; these components have been developed on top of a relational DBMS, using an object-oriented DBMS, called Iris. The fundamental elements of the data model of Iris are objects, types, and functions. An Iris object is represented by a unique identifier. Each object is associated with at least one type. This association supports classification. An object is said to be the instance of the types with which it has classification associations. The results of the study illustrate that the object-oriented prototype has a superior schema, is capable of providing convenient access to information, and is easier to extend and maintain.< >

关键词： Computer aided software engineering Object oriented modeling Transaction databases Data models Computer integrated manufacturing Prototypes Database languages Laboratories Milling machines Application software

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DEVELOPMENT AND CERTIFICATION OF HSLA-100 STEEL FOR NAVAL SHIP CONSTRUCTION - REPLY

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NAVAL ENGINEERS JOURNAL 1990年第4期102卷 103-104页

作者： CZYRYCA, EJ LINK, RE WONG, RJ AYLOR, DA MONTEMARANO, TW GUDAS, JP Ernest J. Czyryca:is a research project leader in the Metals and Welding Division of the David Taylor Research Center. He participated in the cooperative education program at the Center with Drexel University graduating in 1965 with a B.S. degree in metallurgical engineering. He has since received a B.S. degree in civil engineering in 1969 from Johns Hopkins University and an M.S. degree in engineering mechanics in 1970 from the Pennsylvania State University. In his career at the Center he has been involved in or managed major development programs in naval structural metals alloys for machinery applications failure analyses and fatigue and fracture research. Richard E. Link:is a mechanical engineer in the Metals and Welding Division of the David Taylor Research Center. He received his B.S. and M.S. degrees in Mechanical Engineering from the University of Maryland in 1984 and 1985 respectively. His work at the Center includes participation in structural and machinery alloy development programs and research in elastic-plastic fracture mechanics analysis methods. He is an active member of ASTM Committee E-24 on Fracture Testing and the Society for Experimental Mechanics. Richard J. Wong:is a metallurgist in the Metals and Welding Division of David Taylor Research Center. He received his B.S. in materials science from the University of California Berkeley in 1979 and a M.S. degree in engineering science from Catholic University in 1984. His work at the Center includes advanced joining processes weld process development and weldability analysis of naval structural materials. Denise A. Aylor:is a materials engineer in the Metals and Welding Division of the David Taylor Research Center. She received her B.S. degree in materials engineering from Virginia Tech in 1980 and her M.S. degree in materials science and engineering from The Johns Hopkins University in 1984. Her work at the Center has focused on corrosion and corrosion control research of various Navy metallic alloys and of composite materials. Thomas W. M

A significant tonnage of HY-100 steel has been used in the structural designs of new ships and submarines for weight reduction, where HT and HY-80 steels had been previously used. A reduction in hull fabrication costs and higher productivity can be achieved by substitution of an HSLA steel for HY-100. The significant factor in cost savings through use of HSLA steel in fabrication is the reduction or elimination of preheat for welding. Based on the success of the HSLA-80 steel system, a program was initiated to develop and certify an HSLA-100 steel as a replacement for HY-100 in order to reduce fabrication costs. The alloy development and evaluation to support the certification of HSLA-100 steel plate and weldments for surface combatant structural and ballistic protection applications are summarized. HSLA-100 development consisted of three phases: (1) laboratory alloy development to formulate an interim specification; (2) trial steel mill plate production; and (3) plate production for the certification program. An interim specification for HSLA-100 steel plate was used as the basis for the commercial production of over 200 tons of HSLA-100 by domestic steel plate mills. The alloy design of HSLA-100 represents a significantly different metallurgy and microstructure than HSLA-80 steel, but retains the wettability of very low carbon steel. The certification program was conducted to establish the properties, welding characteristics, fabricability, and structural performance of HSLA-100 steel plate over a range of gages from 1/4 to 3 3/4 inches. The certification program included the characterization of production HSLA-100 steel plate mechanical, physical, and fracture properties; evaluation of wettability and welding process limits for structures of high restraint; studies of fatigue properties and effects of marine environments on HSLA-100; and the fabrication and evaluation of large scale structural models to validate the laboratory developed welding process parameters

关键词： Shipbuilding Materials

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control structure determination and enhanced self-tuning using the 'MUSE' AI toolkit

Control structure determination and enhanced self-tuning usi...

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IEE Colloquium on Knowledge Based Environments for Industrial Applications Including Co-Operating Expert systems in control

作者： R. Corea D. Peel A.J. Morris Advanced Process Control and Knowledge Based Systems Research Group Department of Chemical and Process Engineering University of Newcastle UK

The basis of a comprehensive real-time knowledge based system for control structure design and supervisory control is developed using the MUSE AT toolkit. Representation of control engineering knowledge as procedural code in an object-based structure ensures that the knowledge base is easily understood and modified by domain experts. The simple learning capability that has been implemented has proved to be extremely useful and is being developed further as part of continuing research in this area. It is also hoped to extend the capabilities of the supervisory modules particularly in dealing with loop interactions, the prediction and diagnosis of faults and the provision of an intelligent operator interface.< >

关键词： Adaptive control Digital control Design automation control systems Knowledge based systems Knowledge representation

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On dead-zones and other measurement nonlinearities in high-gain feedback control

On dead-zones and other measurement nonlinearities in high-g...

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IEEE Conference on Decision and control

作者： H. Logemann D.H. Owens Institute für Dynamische Systeme Universität Bremen Bremen Germany Department of Mechanical and Process Engineering Division of Dynamics and Control University of Strathclyde Glasgow UK

It is known that linear multivariable minimum-phase systems with invertible high-frequency gain can be regulated by high-gain PI-controllers. An investigation is conducted to determine whether the stability of the closed-loop system is robust against perturbations induced by a class of measurement nonlinearities, including dead zones.< >

关键词： Feedback control Robust stability Nonlinear dynamical systems Sufficient conditions Upper bound Differential equations Laplace equations

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