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American control Conference (ACC)

作者： O. O. Badmus C. N. Nett F. J. Schork School of Chemical Engineering Georgia Institute of Technology Atlanta GA USA Laboratory for Identification and Control of Complex Highly Uncertain Systems School of Aerospace Engineering Georgia Institute of Technology Atlanta GA USA

In this paper we present an integrated compressor control scheme capable of achieving simultaneous surge control and rotating stall avoidance over the full range of compressor operation. The approach adopted in this paper is based on a combination of closed-loop feedback control and open-loop feedforward control of throttle valve area. The feedback control is based on a compressor mass fiow measurment. The feedforward control is based on measuremets of inlet and outlet pressure and temperature. Both the feedback and feedforward controller parameters are continuously scheduled as a function of nominal operating conditions. This approach achieves simultaneous surge control and rotating stall avoidance, over the full range of compressor operation, in the face of i) inlet and outlet pressure and temperature disturbances, and ii) variations in the demanded values of both compressor speed and mass flow. Alternative approaches involving plenum pressure feedback, widely reported in literature, are shown to posess inherent performance limitations not possessed by the mass flow feedback scheme presented here.

关键词： control systems Surges Open loop systems Feedback control Pressure control Temperature control Valves Pressure measurement Weight control Temperature distribution

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USING THE PROPERTIES OF ORGANIC-COMPOUNDS TO HELP DESIGN A TREATMENT SYSTEM

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GROUND WATER MONITORING AND REMEDIATION 1991年第4期11卷 81-86页

作者： NYER, E BOETTCHER, G MORELLO, B Evan K. Nyer is an expert in the research and application of technology to ground water cleanups. As vice president with Geraghty & Miller Inc. he is responsible for engineering services including hazardous and solid waste management environmental and natural resource management remediation activities and designing treatment systems for contaminated sites throughout the United States and in foreign countries. He has designed more than 100 ground water treatment systems. Nyer travels throughout the country teaching treatment techniques at seminars and universities. He has written numerous papers on ground water decontamination and other water and waste water cleanup techniques. He is responsible for bringing to the field many innovative techniques for biological treatment of water soils and in situ treatment and the application of existing technologies to ground water contamination. He is a member of the Water Pollution Control Federation The National Water Well Association The American Institute of Chemical Engineers and The American Society of Civil Engineers. Bridget Morello received a B.S. Che from the University of South Florida in 1987 and is currently working for Geraghty & Miller's Process Group in Tampa Florida. She is mainly involved in treatability evaluation and design of ground water treatment systems. Gary Boettcher is a project scientists with Geraghty & Miller Inc. in Tampa Florida. He received his B.S. degree in microbiology from the University of South Florida and is currently pursuing a Master of Public Health (MPH) degree. He is involved in investigation treatability and design of biological remediation systems.

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EVALUATING THE EFFECTIVENESS OF GROUND-WATER EXTRACTION systems

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GROUND WATER MONITORING AND REMEDIATION 1991年第1期11卷 119-124页

作者： HALEY, JL HANSON, B ENFIELD, C GLASS, J Jennifer Haley is a chemical engineer working in the Remedial Operations and Guidance Branch of the Hazardous Site Control Division/Office of Emergency and Remedial Response (U.S. EPA OS-220 401 M St. SW Washington D.C. 20460). One of her responsibilities during her three years at EPA has been completion of the EPA Guidance on Remedial Actions for Contaminated Ground Water at Superfund Sites. Prior to taking her current position at the EPA in May 1987 she worked for two years for the California Regional Water Quality Control Board overseeing ground water contamination investigations and cleanups in the South San Francisco Bay. She received a B.S. in chemical engineering from the University of California in Berkeley and an M.S. in environmental management from the University of San Francisco. Bill Hanson is an engineer with the U.S. Environmental Protection Agency (OS-220 401 M St. SW Washington D.C. 20460). He received both his B.S. in engineering and M.A. in environmental engineering from Duke University. Before joining the Environmental Protection Agency Hanson worked for several consulting engineering firms including CH2M Hill in Res ton Virginia. At EPA he first worked in the Effluent Guidelines Program where he was responsible for developing pretreatment and direct discharge regulations for the electroplating industry. Hanson has been with the Superfund program since its start. He is currently chief of the Remedial Operations and Guidance Branch. His branch is responsible for developing guidance for consistency of approach with respect to selection of remedy land ban treatment requirements and treatability protocols. Carl G. Enfield is a soil scientist at the Robert S. Ken Environmental Research Laboratory (U.S. EPA Office of Research and Development P.O. Box 1198 Ada OK 74820). He earned his B.S.C.E. in civil engineering and M.S. in agronomy at Purdue University and his Ph.D. in agricultural chemistry and soils at the University of Arizona. He currently serves as research director at EP

The most common process for remediating contaminated ground water is extraction and treatment. Data from 19 on-going and completed ground water extraction systems were collected and analyzed (U.S. EPA 1989b) to evaluate the effectiveness of this process in achieving cleanup concentration goals for ground water. This analysis indicated several trends including (1) containment of ground water plumes was usually achieved;(2) contaminant concentrations dropped significantly initially followed by a leveling out;(3) after the period of initial rapid decline, the continued decreases in concentration were usually slower than anticipated;and (4) certain data important to optimizing system design and operation had often not been collected during the site characterization phase. Factors limiting the achievement of cleanup concentration goals fell into four basic categories: (1) hydrogeological factors, such as subsurface heterogeneity, low-permeability units, and presence of fractures;(2) contaminant-related factors, such as high sorption to soil and presence of non-aqueous phases (dissolution from a separate non-aqueous phases (dissolution from a separate non-aqueous phase or partitioning of contaminants from the residual non-aqueous phase);(3) continued migration from source areas and the size of the plume itself;and (4) system design factors, such as pumping rates, screened intervals, and extraction well locations. The findings of this study indicate that ground water extraction is an effective method for preventing additional migration of contaminant plumes and achieving risk reduction. However, the findings indicate that in many situations, it may not be practicable to rely solely on ground water extraction and treatment to achieve health-based cleanup concentrations throughout the contaminated zone and fulfill the primary goal of returning ground water to beneficial use. This study suggests several recommendations (U.S. EPA 1989a) for improving ground water response acti

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LESSONS LEARNED FROM ZINC ANODE PROCUREMENTS

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NAVAL ENGINEERS JOURNAL 1991年第6期103卷 75-77页

作者： BRINCKERHOFF, B The Author received his bachelor of science degree in chemical engineering from the University of Maryland in May 1985. In June 1985 he began working at the Naval Sea Systems Command as an engineer-in-training (EIT). After completion of the EIT program he began working in his present position in the Corrosion Control Branch of the Materials and Assurance Engineering Office (NavSea 05M1). His responsibilities include life cycle management for sacrificial cathodic protection systems and prevention of alloy 625 crevice corrosion. This paper is a result of his work at NavSea in support of the zinc anode quality improvement program. Mr. Brinckerhoff is a member of the American Society of Naval Engineers National Association of Corrosion Engineers and the NavSea Association of Scientists and Engineers.

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Interactive power system data preparation and verification using a pc‐editor

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European Transactions on Electrical Power 1991年第3期1卷 149-152页

作者： Linke, K. Rumpel, D. Dip1.-Ing. Klaus Linke (1939) VDEis the director of the department "load dispatching and network operation" of Vereinigte Elektrizitatswerke Westfalen AG (VEW). DortmundGermany. After the study of electrical engineering at the Technical University of KarlsruhdGermany he started his professional career in an engineering-concern where he was responsible among others for investigations concerning the installation of process-computers in chemical plants. In 1968 he changed to VEW. Here in 1984 he took over his present position in which he is mainly engaged with the tasks of the management of the HV and EHV network and the power system control together with the problems concerning network automation incident to it. (Vereinigte Elektrizitatswerke Westfalen AG Hauptverwaltung Rheinlanddamm 24 W-4600 Dortmund 1 T +49 23 114 38-42 41) Dr.-Ing. Dieter Rumpel (1932) VDE is full professor and since 1978 head of the Power Systems Institute of Duisburg University Germany. He got his DiplAng. degree from the Technical University Munich and his Dr.-Ing. degree from the Technical University Berlin. Before his call to Duisburg he worked at Siemens AG for 23 years. (Universiiit-GHDuisburg Fachbereich Elektrotechnik PF 10 15 03 W-4100 Duisburg T 4 9 20 313 79-34 37)

For computerized power system operation, all objects of the network must be mapped in a data‐model. For this task, the „Grid Data Language” (GDL) does not apply format‐bound source data, but describes the objects using a format‐free source text. To handle such texts, an editing‐ and verification‐system was implemented. This paper reports its application when describing an extra‐high voltage network for use in a training simulator. In that way, the full content of a dispatcher EHV data‐model could be converted to GDL, requiring a work of 15 to 20 man‐days. Copyright © 1991 John Wiley & Sons, Ltd.

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Design and implementation of optimal digital variable gain controller

Design and implementation of optimal digital variable gain c...

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IEEE International Conference on systems, Man and Cybernetics

作者： M.K. Habib S. Al-Assadi A.M. Al-Tamimi Institute of Physical and Chemical Research Wako Saitama Japan Systems and Control Engineering Department University of Technology Baghdad Iraq

The hardware and software design and implementation of an efficient microprocessor-based digital control loop for optimal gain tuning is described. A method is proposed whereby the gain of the system controller is varied continuously, so as to improve the dynamic performance of the closed-loop system response. It is shown that the optimal gain at any instant is a function of the system's states at that instant. The optimal gain tuning for the gain controller is solved analytically using the Phillips integral algorithm in the sense of minimizing the integral squared error (ISE) criterion formulated in the time domain. The theoretical system response and that of a real-time implementation are compared. Experimental results demonstrate the advantages of the controller. Suitable accuracy can be achieved using A/D and D/A converters with 12 bits as input to the microprocessor or output from it. The average time required for the microprocessor to compute the value of the time-varying gain control is 17.58 ms when the operating frequency of the 8085 microprocessor is 3 MHz.< >

关键词： Microprocessors Hardware Software design Digital control Performance gain control systems Optimal control Algorithm design and analysis Error correction Time domain analysis

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Multivariable Adaptive Optimisation of the Performance of Fermentation Process

Multivariable Adaptive Optimisation of the Performance of Fe...

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American control Conference (ACC)

作者： C Kambhampati M. T. Tham G. A Montague A. J. Morris National Engineering Laboratory UK Advanced Control and Knowledge Based Systems Research Group DEPARTMENT (IF CHEMICAL AND PRICESS ENGINEERING University of Newcastle Newcastle-Upon-Tyne UK

This paper addresses the multi-variable optimisation of bioreactor performance. The central idea here is to use a time series model, which is identified on-line, to evaluate the steady-state performance of the bioreactor. A simple algorithm has been developed around this theme and analysed in Kambhampati et al (1989). A fermentation process model has been developed to provide a test system for the optimisation scheme. The model takes into account the effect of temperature and dilution rate on the biomass production. For this process a multi-variable, model is identified on-line. It has been shown that the model provided optimal results.

关键词： Steady-state Mathematical model Bioreactors Temperature control systems chemical engineering Algorithm design and analysis Monitoring System testing Biomass

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Book reviews

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Annals of Biomedical engineering 1990年第3期18卷 317-335页

作者： Jack M. Winters Robert J. Morff Charles S. Lessard David E. Bergbreiter Benjamin S. Kelley Fertac Bilge William A. Hyman Brad D. Etter Karan Watson Timothy W. King Carolyn A. Bradley Yun S. Choi Marta Váchová Chemical Bio & Materials Engineering Arizona State University USA Medical Instrument Systems Research Division Eli Lilly & Co. Indianapolis Bioengineering Program Texas A&M University College Station Department of Chemistry Texas A&M University College Station Biomedical Engineering Mercer University Macon St. Jude Medical St. Paul Department of Electrical Engineering Texas A&M University College Station Department of Polymers State Institute for Drug Control Prague Czechoslovakia

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A PRACTICAL APPROACH TO THE DESIGN, OPERATION, AND MONITORING OF INSITU SOIL-VENTING systems

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GROUND WATER MONITORING AND REMEDIATION 1990年第2期10卷 159-178页

作者： JOHNSON, PC STANLEY, CC KEMBLOWSKI, MW BYERS, DL COLTHART, JD Paul C. Johnson Ph.D. joined Shell Development Co.'s (Westhollow Research Center Room EC-649 P.O. Bo 1380 Houston TX 77251–1380) Environmental Science Department in 1987 after earning his B.S. in chemical engineering from the University of California Davis and his Ph.D. in chemical engineering from Princeton University. His current areas of research include the development and evaluation of soil treatment processes modeling and measuring transport phenomena in porous media and the development of transport models for predicting emissions and exposures used in envvironmental risk assessments. Curtis C Stanley received his degree in geology with an engineering minor from North Carolina State University in 1979. He is currently a senior hydrogeologist for Shell Oil Co. (Westhollow Research Center 2236 Two Shell Plaza Houston TX 77082) and is responsible for hydrogeologic response at Shell's retail facilities. Stanley is a Certified Professional Geological Scientist and also a Certified Ground Water Professional with the NWWA's Association of Ground Water Scientists and Engineers. He is also a member of API's Ground Water Technology Taskforce and is an EPA Peer Reviewer. Marian W. Kemblowski Ph.D. is a senior research engineer in the Environmental Science Department at Shell Development Co. (Westhollow Research Center Houston TX 77082) where he has worked since 1985. He obtained his M.S. degree in civil engineering from the Technical University of Warsaw Poland in 1973 and his Ph.D. in ground water hydrology from the Institute for Land Reclamation in Warsaw Poland in 1978. In 1980–1981 he was a visiting hydrologist in the New Mexico School of Mining and Technology. From 1981 to 1985 he worked as an assistant scientist at the University of Kansas. His principal research interests are in the areas of numerical analysis transport in porous media and ground water monitoring systems. Dallas L. Byers is a technical associate in the Environmental Science Department at Shell Development. After receivin

When operated properly, in situ soil venting or vapor extraction can be one of the most cost-effective remediation processes for soils contaminated with gasoline, solvents, or other relatively, volatile compounds. The components of soil-venting systems are typically off-the-shelf items, and the installation of wells and trenches can be done by reputable environmental firms. However, the design, operation, and monitoring of soil-venting systems are not trivial. In fact, choosing whether or not venting should be applied at a given site is a difficult decision in itself. If one decides to utilize venting, design criteria involving the number of wells, well spacing, well location, well construction, and vapor treatment systems must be addressed. A series of questions must be addressed to decide if venting is appropriate at a given site and to design cost-effective in situ soil-venting systems. This series of steps and questions forms a “decision tree” process. The development of this approach is an attempt to identify the limitations of in situ soil venting, and subjects or behavior that are currently difficult to quantify and for which future study is needed.

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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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