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IEEE Conference on Decision and control

作者： D.E. Rivera S.V. Gaikwad Department of Chemical Bio and Materials Engineering and Control Systems Engineering Laboratory Computer-Integrated Manufacturing Systems Research Center Arizona State University Tempe AZ USA

The use of prefiltered ARX (autoregressive with exogenous input) estimation to obtain reduced-order models that satisfy the Prett-Garcia (1988) digital PID (proportional plus integral plus derivative) tuning rules is described. The design of the prefilter is performed systematically using the engineer's desired control requirements and the setpoint/disturbance characteristics of the problem. The benefits of this method are shown for a fourth-order system.< >

关键词： Three-term control Digital control Reduced order systems Design engineering Systems engineering and theory control systems

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modeling for control Design in Combined Feedback/Feedforward control

Modeling for Control Design in Combined Feedback/Feedforward...

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American control Conference (ACC)

作者： Daniel E. Rivera Sujit V. Gaikwad Department of Chemical Bio and Materials Engineering and Control Systems Engineering Laboratory Computer-Integrated Manufacturing Systems Research Center Arizona State University Tempe AZ USA

This paper presents control-relevant parameter estimation as a means to address the problem of modeling requirements for a combined feedback-feedforward control system. The key element in the estimation procedure is prefiltering of the input and output time series obtained from the plant. This insures that the estimated model retains those plant characteristics that are most significant with regards to the user's control requirements. An example model reduction problem is presented which uses the IMC design procedure to design a reduced-order feedback-feedforward control system. Its performance is compared to both full-order IMC and model-predictive control via DMC.

关键词： control design control system synthesis Parameter estimation Linear feedback control systems control systems Design engineering Systems engineering and theory process control Transfer functions Predictive models

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Robustness and Identification Issues in Horizon Predictive control With Application to a Binary Distillation Column

Robustness and Identification Issues in Horizon Predictive C...

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American control Conference (ACC)

作者： D.E. Rivera K.S. Jun E. Elisante V.E. Sater B. C. Horn Department of Chemical Bio and Materials Engineering and Control Systems Engineering Laboratory Computer-Integrated Manufacturing Systems Research Center Arizona State University Tempe AZ USA Honeywell Industrial Automation and Control Phoenix AZ USA

This paper analyzes the robustness properties and modeling requirements for model-predictive control via Horizon Predictive control (HPC). The theory of Structured Singular Values is used to determine optimal values for the correction horizon in HPC given user-provided uncertainty intervals and performance weights. Regarding system identification, control-relevant identification principles are used to provide guidelines for input signal design, prefiltered estimation, and uncertainty modeling. These results are tested experimentally using data from a methanol-isopropanol distillation column.

关键词： Robust control Predictive control Distillation equipment Predictive models Uncertainty System identification control system synthesis Guidelines Signal design Testing

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Computer aids for chemical engineering education. An assessment of CACHE-1971-1992

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Computer Applications in engineering Education 1992年第1期1卷 3-3页

作者： Seider, W.D. Chemical Engineering Department University of Pennsylvania Philadelphia Pennsylvania 19104–6393 Warren Seider:is Professor of Chemical Engineering at the University of Pennsylvania. His research is in the area of process design with an emphasis on operability and controllability. In coursework he uses the computer actively to teach design synthesis process control and separation processes. Warren is a coauthor ofIntroduction to Chemical Engineering and Computer CalculationsandFLOWTRAN Simulation—An Introduction. He has served as the first President of the CACHE Committee and chair of its Curriculum Task Force. He received his BS degree from the Polytechnic Institute of Brooklyn and his PhD from the University of Michigan.

Since its inception in 1971, the Computer Aids for chemical engineering Education (CACHE) Corporation has concentrated on promoting cooperation among universities, industry, and government in the development and distribution of computer-related and/or technology-based educational aids for the chemical engineering profession. This article assesses the success of several projects designed to provide aids for individual courses, as well as for a broader segment of the curriculum. The projects include: (1) the provision of 125 computer assignments for the core courses; (2) the preparation of teaching materials for, and the distribution of, Monsanto's FLOWTRAN program for use in the design courses; (3) the preparation of PC modules for many courses, leading to the Michigan project on the Development of Innovative Engineers, the Washington project on Graphical Computer Aids for fluid flow and reaction in the design of chemical reactors, and the Purdue project on Laboratory Modules; and (4) the development of the MICROCACHE courseware delivery system. Also considered are the CACHE recommendations concerning the minimum requirements for computing in the undergraduate curriculum, presented to the AIChE Education and Accreditation Committee. The CACHE Corporation has facilitated several research conferences, the impact of which is assessed.

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Abstracts of papers presented at the 12th Conference of the Weed Science Society of Israel

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Phytoparasitica 1992年第4期20卷 325-366页

作者： J. Gressel J. Friedman S. Chyen D. Stern O. Barazani Paulina Keller Y. Kleifeld Miriam Zilberstein A. Dinoor Nava Eshed S. Golan Ora Edut A. Lisaii H. Buxbaum R. Gadish M. Horowitz L. Afgin G. Herzlinger A. Grinstein H. Aviram J. Secor Rina Varsano A. Tal B. Rubin Ariela Leist J. Caseley M. Negbi R. Scalla T. Yaacoby J. C. Hall G. R. Stephenson Tamas Komives J. Gressfx M. Sibony Y. Benyamini S. R. Moss J. C. Caseley D. Chamovitz Iris Pecker G. Sandmann J. Hirschberg A. Perl R. Perl-Treves S. Galili Dvora Aviv E. Shalgi S. Malkin E. Galun M. Schonfeld M. A. K. Jansen A. Trebst M. Edelman Hadar Kless N. Ohad Y. Evron M. Yogev D. M. Joel D. Losner-Goshen A. M. Mayer G. Ben-Mod A. Bargutti R. Jacobsohn E. Eldar Adiva Shomer-Ilan Y. Goldwasser E. Levitin O. Arav Dana Kahana Rinatrusso D. Palevitz A. Levy Orly Michael D. Baum A. Nir A. Raz Z. Ben-Arie D. Carmon R. Epstein J. Baum Y. Oren S. Glidal S. Graph U. Luchinsky A. Hadar S. Kethain S. Glidai M. Gootman Y. Noy H. Apelblat H. Bucsbaum Y. Weiss M. J. Pinthus B. Retig W. Lerer N. Barnea R. Gelman A. Daube U. Rosenberg S. Ovadia Depl. of Plant Genetics Weizmann Institute of Science Rehovot Israel Dept. of Botany The George S. Wise Faculty of Life Sciences Tel-Aviv University Tel Aviv Israel Dept. of Weed Science ARO Newe Ya’ar Regional Experiment Station Haifa Dept. of Subtropical Horticulture ARO The Volcani Center Bet Dagan Dept. of Plant Pathology and Microbiology Faculty of Agriculture The Hebrew University of Jerusalem Rehovot Israel Extension Service Ministry of Agriculture Zefat Israel Dept. of Ornamental Horticulture ARO The Volcani Center Bet Dagan Israel Dept. of Weed Science ARO Newe Ya’ar Regional Experiment Station Haifa Israel Institute of Agricultural Engineering ARO Bet Dagan Israel Israel Bio-Organic Agriculture Association Vegetable Growers Organization Tel Aviv Israel DowElanco Midland USA Dept. of Field and Vegetable Crops Faculty of Agriculture The Hebrew University of Jerusalem Rehovot Israel AFRC IARC Long Ashton Research Station University of Bristol Long Ashton Dept. of Agricultural Botany Faculty of Agriculture The Hebrew University of Jerusalem Rehovot Israel INRA Laboratoire des Herbicides Dijon Cedex France Dept. of Plant Protection and Inspection Ministry of Agriculture Bel Dagan Israel Dept. of Environmental Biology Univ. of Guelph Ontario Canada Plant Protection Institute Hungarian Academy of Sciences Budapest Hungary Dept. of Plant Genetics Weizmann Institute of Science Rehovot Israel AFRC IACR Long Ashton Research Station University of Bristol Long Ashton Depl. of Genetics The Hebrew University of Jerusalem Jerusalem Israel Lehrstuhl für Physiologie und Biochemie der Pflanzen Universität Konstanz Konstanz Germany Dept. of Biochemistry Weizmann Institute of Science Rehovot Israel Dept. of Biology Ruhr-Universität Bochum Germany Dept. of Genetics The Hebrew University of Jerusalem Jerusalem Israel Dept. of Botany The Hebrew University of Jerusalem Jerusalem Israel Dept. of Vegetable Crops ARO The Volcani Center Bel Daga

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A New Design Method for Bilinear Suboptimal Systems

A New Design Method for Bilinear Suboptimal Systems

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American control Conference (ACC)

作者： Y.Q. Ying M. Rao Y.X. Sun Department of Chemical Engineering University of Alberta Edmonton Canada Research Institute of Process Control University of Zhejiang China

In this paper, the suboptimal control for bilinear systems is discussed by use of the extension of linear-quadratic optimal control index. The design method of this bilinear suboptimal control system is presented. Its application to the moisture control of the paper-making process, as a example, is given. The simulation results show that this suboptimal control system functions very well.

关键词： Design methodology Optimal control control systems Nonlinear systems Linear systems Jacobian matrices Bismuth Performance analysis Equations chemical engineering

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Phase transformations during heating of llmenite concentrates

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Metallurgical Transactions B 1991年第5期22卷 711-716页

作者： Gupta, Suresh K. Rajakumar, V. Grieveson, Paul G.K. Williams Cooperative Research Center for Extractive Metallurgy Department of Chemical Engineering Melbourne University Parkville 3052 Victoria Australia Division of Mineral and Process Engineering Commonwealth Scientific and Industrial Research Organization Clayton 3168 Victoria Australia Department of Materials Imperial College of Science Technology and Medicine London 2BP SW7 United Kingdom

llmenite concentrates were heated in argon and oxygen in the temperature range 700 °C to 1000 °C to study the behavior of the pseudorutile phase and other changes which occur. Pseudorutile does not persist in argon or oxygen in the temperature range studied. In argon at 700 °C, pseudorutile decomposes into hematite and rutile, while at 1000 °C, it combines with ilmenite to form ferrous-ferritic pseudobrookite solid solution. A new phase "Fe₂O₃-2TiO₂" was identified as an intermediate product during the heating of ilmenite or pseudorutile in oxygen. This compound decomposes into hematite and rutile below 800 °C and to pseudobrookite and rutile above 800 °C. The sequence of reactions during the heating of ilmenite and pseudorutile in oxygen is proposed. © 1991 The Minerals, Metals & Material Society.

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FIELD SAMPLING OF RESIDUAL AVIATION GASOLINE IN SANDY SOIL

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GROUND WATER MONITORING AND REMEDIATION 1991年第2期11卷 107-120页

作者： OSTENDORF, DW LEACH, LE HINLEIN, ES XIE, YF 1 David W. Ostendorf is an associate professor in the Environmental Engineering Program of the Civil Engineering Department at the University of Massachusetts (Civil Engineering Department University of Massachusetts Amherst MA 01003). His research interests include unconfined aquifer contamination hazardous waste site remediation and analytical modeling of problems in environmental fluid mechanics. Dr. Ostendorf is a registered professional engineer in Massachusetts and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation and Association of Environmental Engineering Professors as well as the National Water Well Association.2 Lowell E. Leach is an environmental engineer with the Robert S. Kerr Environmental Research Laboratory of the U.S. Environmental Protection Agency (RS Kerr Environmental Research Laboratory U.S. EPA P.O. Box 1198 Ada OK74820). Leach received his B.S. ingeological engineering at the University of Oklahoma in 1959 and has been a registered professional engineer in Oklahoma since 1966. With 29 years of experience in field applications of geological engineering he is responsible for developing methodology for sampling ground water and subsurface materials for the Robert S. Kerr Environmental Research Laboratory.3 Erich S. Hinlein is a research assistant in the Environmental Engineering Program of the Civil Engineering Department at the University of Massachusetts (Civil Engineering Department University of Massachusetts Amherst MA 01003). His research interests include ground water pollution hazardous waste site investigation and transport processes in unconfined aquifers. Hinlein graduated with a B.S. in electrical and computer engineering from the University of Massachusetts at Amherst in May 1985 and entered the Environmental Engineering Master's Degree Program in January 1989.4 Yuefeng Xie is a postdoctoral research associate in the Environmental Engineering Program of the Civil E

Two complementary field sampling methods for the determination of residual aviation gasoline content in the contaminated capillary fringe of a fine, uniform, sandy soil were investigated. The first method featured field extrusion of core barrels into pint-size Mason jars, while the second consisted of laboratory partitioning of intact stainless steel core sleeves. The barrel extrusion procedure involved jar headspace sampling in a nitrogen-filled glove box, which delineated the 0.7m thick residually contaminated interval for subsequent core sleeve withdrawal from adjacent boreholes. Soil samples removed from the Mason jars (in the field) and sleeve segments (in the laboratory) were subjected to methylene chloride extraction and gas chromatographic analysis to compare their aviation gasoline content. The barrel extrusion sampling method yielded a vertical profile with 0.10m resolution over an essentially continuous 5.0m interval from the ground surface to the water table. The sleeve segment alternative yielded a more resolved 0.03m vertical profile over a shorter 0.8m interval through the capillary fringe. The two methods delivered precise estimates of the vertically integrated mass of aviation gasoline at a given horizontal location, and a consistent view of the vertical profile as well. In the latter regard, a 0.2m thick lens of maximum contamination was found in the center of the capillary fringe, where moisture filled all voids smaller than the mean pore size. The maximum peak was resolved by the core sleeve data, but was partially obscured by the barrel extrusion observations, so that replicate barrels or a half-pint Mason jar size should be considered for data supporting vertical transport analyses in the absence of sleeve partitions.

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A RATIONAL APPROACH TO control VALVE SIZING

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INDUSTRIAL & engineering CHEMISTRY research 1990年第4期29卷 700-703页

作者： LUYBEN, WL Process Modeling and Control Center Department of Chemical Engineering Lehigh University Pennsylvania 18015 111 Research Drive Bethlehem United States

The sizing of control valves usually involves a trade-off between pump head and control valve size: the bigger the valve, the smaller the pressure drop across the valve and the lower the pump head. Thus, large valves are desirable from a steady-state energy-consumption viewpoint. However, dynamic rangeability is improved by designing the system for small, high pressure drop control valves. control valves are often sized on the basis of heuristics, the most common one being to make the pressure drop over the control valve at design conditions one-third of the total system pressure drop. In some applications, this rule-of-thumb works well, but in others it is totally inadequate. A more rational procedure is presented in this paper. The idea is to specify the maximum and minimum flow rates required. Then the sizes of both the pump and the control valve can be directly calculated. © 1990, American chemical Society. All rights reserved.

关键词： Flow of Fluids

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MULTIPLE EPISODES OF INDUCED SECRETION OF HUMAN GROWTH-HORMONE FROM RECOMBINANT ATT-20 CELLS

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CYTOTECHNOLOGY 1990年第2期4卷 111-119页

作者： SAMBANIS, A STEPHANOPOULOS, G LODISH, HF Department of Chemical Engineering and Biotechnology Process Engineering Center M.I.T. Cambridge USA Whitehead Institute for Biomedical Research Cambridge USA Department of Biology and Biotechnology Process Engineering Center M.I.T. Cambridge USA School of Chemical Engineering Georgia Institute of Technology Atlanta USA

Recombination AtT-20 cells expressing human growth hormone (hGH) secreted the hormone at a constant, basal rate of 0.3-0.5 ng/105 cells-hour when exposed to medium without secretagogues. When triggered with 8 bromo-cyclic AMP, cells secreted hGH at an initial rate of 1.7 ng/105 cells-hour white intracellular hGH declined sharply. Upon extended exposure to secretagogue, secretion decreased gradually to the basal rate and intracellualr hGH stabilized at a value 40% the initial. In cells switched from secretion to growth medium, the total rate of hGH accumulation intracellularly and in medium was 2.2 times that observed with cells never exposed to secretagogue;however, only a fraction of the hormone was stored intracellularly and the rest was secreted. When cells were exposed alternately to growth and secretion medium, induced cells secreted at rates at least two times higher than uninduced controls during the first five cycles. The induced response deteriorated with time, however, in parallel with outgrowth of attached cells by foci of found cells, and by the eighth cycle induced secretion did not occur. Operational modifications that may improve the performance of cycling schemes are discussed.

关键词： AtT-20 cycling operation human growth hormone regulated and constitutive secretion

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