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European Signal Processing Conference (EUSIPCO)

作者： Aleš Procházka Jonathan Smith Prague University of Chemical Technology Department of Computing and Control Engineering Technická 1905 166 28 Prague 6 Czech Republic South Bank University School of Engineering Systems and Design 103 Borough Road London SE1 OAA England

Multichannel time-series result from observations of a given engineering, biomedicai, econometric or environmental variable taken at different locations. Processing this type of signal presents problems associated with its extrapolation in given space ranges and its possible prediction. This paper presents a comparison of seasonal AR modelling of such signals and the application of wavelet networks to the system identification and prediction of a particular signal. The choice of wavelet functions and the optimization of their coefficients is discussed as well. Each method suggested in the paper is verified for simulated signals at first and then used for the analysis of real signals, including the observation of air pollution. All algorithms are written in the MATLAB environment.

关键词： Wavelet analysis Neural networks Predictive models Atmospheric modeling Wavelet transforms Air pollution Wavelet domain

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Inexpensive electronic water level recorders for hydrologic studies

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GROUND WATER MONITORING AND REMEDIATION 1996年第2期16卷 77-83页

作者： Keenan, R Dickerson, J Gardner, L Reeves, H Richard Keenanis a hydrogeologist at Golder Associates Inc. Jacksonville Florida working on site investigation and remediation projects for ground water and soil contamination. His research interests include ground water modeling geologic analysis of coastal plain depositional environments and processing and analysis of remotely sensed images. He was raised in South Carolina and Puerto Rico and received a B.S. in marine science (1989) and an M.S. in geology (1994) from the University of South Carolina. John Dickersonhas been on the civil engineering faculty of the University of South Carolina in Columbia South Carolina for the past 20 years. He is a registered professional engineer and specializes in dynamical measurements and control in addition to the application of microprocessors in engineering experiments. He grew up in northern Illinois received a mechanical engineering degree from the Illinois Institute of Technology in 1963 and a Ph.D. in applied mechanics from the California Institute of Technology in 1967. Leonard Gardnerhas been a faculty member of the Geological Sciences Department at the University of South Carolina in Columbia South Carolina since 1968. He has published numerous papers on the geochemistry of weathering and soil genesis and on geological and geochemical processes in salt marshes. He was born and raised in New Jersey received a B.S. in English (1958) from St. Peter's College in Jersey City and then earned a B.S. (1963) M.S. (1966) and Ph.D. (1968) in geology from the Pennsylvania State University. Howard W. Reevesis an assistant professor in Civil Engineering at Northwestern University. Reeves joined the faculty at Northwestern in 1994 to coordinate the environmental geotechnics research area and was an assistant professor of Geological Sciences at the University of South Carolina from 1991 to 1994. Reeves earned a B.S. in chemical engineering and an M.S. in environmental engineering at the University of Notre Dame and a Ph. D. in en vironmental engineering at The Univer

Hydrologic investigations typically involve the collection of water level measurements at discrete points in space and time. The high cost of commercial electronic recorders can be a burden. We have developed an inexpensive ((similar to)$200) electronic water level recorder consisting of a Motorola microcontroller, a clock. memory, pressure transducers, and associated circuitry. The instrument is powered by a 6-V battery. These devices. each capable of monitoring up to eight channels of analog input, are presently providing continuous monitoring of nested piezometers, tide gauges, and rain gauges in hydrologic studies at the Savannah River site and the North Inlet (South Carolina) Long-Term Ecological Research (LTER) site. The instruments can be custom tailored to record water levels at any specified time interval, or whenever the water level changes by a specified amount, and can store up to 32,000 water level observations. These instruments have been used to conduct slug tests and can be configured to monitor observation wells for pumping tests. Simplicity of construction and availability of components offer hydrologists an inexpensive but reliable method of water level recording. Several examples of the use of this instrumentation in diverse hydrologic settings are described.

关键词： Recording instruments

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Phytoremediation

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GROUND WATER MONITORING AND REMEDIATION 1996年第1期16卷 58-62页

作者： Nyer, EK Gatliff, EG Evan K. Nyer is an expert in the research and application of technology to ground water cleanup. As vice president of Geraghty & Miller Inc. (P.O. Box 273630 Tampa FL 33688–3630) he has been responsible for maintaining and expanding Geraghty & Miller's technical expertise in aboveground and in situ remediation engineering bioremediation and many other areas. He also provides expertise in engineering services including the design of treatment systems for contaminated water sites throughout the United States. He has designed and installed more than 200 ground water and soil remediation systems. He is a member of the Water Pollution Control Federation NGWA the American Institute of Chemical Engineers the American Institute of Chemical Engineers and the American Society of Civil Engineers. Edward G. Gatliff Ph.D. is president of Applied Natural Sciences Inc. in Hamilton Ohio. He is a former research director for agricultural studies at Servi-Tech Inc. and has directed the analytical sciences division for Bowser-Morner Inc. In addition to developing the Tree Mediation® process he has worked extensively with remote monitoring with computers and sensors. He continues to conduct research and consultation services for TreeMediation and other vegetative remediation projects.

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Characteristics and classification of high-current fault arcs an distribution systems

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ELECTRICAL engineering IN JAPAN 1996年第6期116卷 59-71页

作者： Goda, Y Okazaki, M Inaba, T Central Research Institute of Electric Power Industry Received his B.S. degree in Electrical Engineering from Nagoya University in 1979. He joined Central Research Institute of Electric Power Industry (CRIEPI) in April 1979. He was a Visiting Research Associate at the University of Connecticut in the United States from 1991 to 1992. He is engaged mainly in research on high-current arcs in power systems. He is currently working in the High-Power Group at the Yokosuka Research Laboratory of CRIEPI. He is a senior member of the IEEE. Graduated from Yokosuka Technical High School Kanagawa Prefecture in 1961. He joined High-Voltage Power Laboratory Foundation Inc. in April 1961. He joined Central Research Institute of Electric Power Industry in July 1977. He is engaged in research on high-current arc phenomena. He received the Shibusawa Award in 1971. He is currently working in the High-Power Group at the Yokosuka Research Laboratory of CRIEPI. Chuo University Received his M.S. degree from Nagoya Institute of Technology and his Ph.D. degree from Nagoya University in 1968 and 1971 respectively in Electrical Engineering. He was with Mitsubishi Electric Corporation from 1959 to 1964 Adeka Argas Chemical Co. from 1965 to 1968 and Central Research Institute of Electric Power Industry from 1971 to 1994. Since 1994 he has been a full Professor at Chuo University. He is engaged mainly in research on arc control and applied technology. He was a guest Professor at Technische Universität Braunschweig in Germany sponsored by the Humboldt foundation from 1978 to 1979 engaged in research on current-limit interruption. He was awarded the best article prize in 1976 and 1988 and a Book Award in 1994 all from the I.E.E. Japan. He was a Counsel of the I.E.E. Japan from 1988 to 1989. He was in charge of research and investigation in Basic Division from 1990 to 1991 and is currently a Chairman of the Special Investigation Committee on High-Current Energy Control Technology. He is a member of the Cryogenic Association of Japa

When a fault occurs on transmission or distribution systems due to lightning or overvoltage, often an are discharge occurs at the fault point. The are discharge, which is caused by a fault current, has a high current, high temperature, strong light emission, etc., thus it sometimes causes heavy damages to electric power equipment. The arc discharge is influenced by the conditions around the arcs, i.e., gas, insulation materials, gap length, weather, etc. Also, the are voltage along the are column indicates the characteristics of the are. If the voltage waveforms of the arcs caused by the fault on transmission or distribution systems are classified, it is possible to find the location and the equipment where the fault occurred. In this paper, the are voltage data in 6-kV class XLPE cables and 6-kV class overhead lines are analyzed and an artificial neural network method is applied to classify the are voltage waveforms. The results obtained from the six artificial neural networks developed show that the artificial neural network method is effective for classification of are voltage waveforms if adequate input parameters are selected.

关键词： short circuit arc arc voltage 6-kV class distribution system neural network

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CONTRIBUTION OF INTERNAL FORCES TO THE DYNAMICS OF CLOSED CHAIN MECHANISMS

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ROBOTICA 1995年第5期13卷 507-514页

作者： ADLI, MA HANAFUSA, H Laboratory for Bio-Mimetic Control Systems Bio-Mimetic Control Research Center (The Institute of Physical and Chemical Research) RIKEN 8–31 Rokuban 3-chome Atsuta-ku Nagoya 456 (Japan). The Graduate School of Science and Engineering Ritsumeikan University 1916 Noji-cho Kusatsu-shi Shiga 525. (Japan).

The kinematic structure of closed chain mechanisms is suitable for putting an excess number of inputs in addition to the required number to control their position and orientation. With the addition of these excess inputs, it is possible to generate and control the internal forces within the mechanisms by simultaneously activating joints whose action opposes each other. The internal forces balance inside the structure of mechanisms and do not create any resultant force. However, at the static or quasi-static cases they change the stiffness of the mechanisms. In dynamic cases, in addition to the change in stiffness, they may also generate a damping effect. As a result of these effects, the dynamic behavior of closed chain mechanisms changes. This study analyzes the dynamics of the closed chain mechanisms under the effect of internal forces through the simulation and experimental results using a planar closed chain mechanism.

关键词： INTERNAL FORCES CLOSED CHAIN MECHANISMS control DYNAMICS

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Robust Analysis of Distillation Column Dynamics

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IFAC Proceedings Volumes 1995年第9期28卷 333-338页

作者： E.I. Varga G.Z. Kovács S.B. Jørgensen K.M. Hangos Systems and Control Laboratory Computer and Automation Research Institute Department of Chemical Engineering The Technical University of Denmark Lyngby Denmark

The robust stability and performance of a binary distillation column model is analysed using a minimal state space representation. The uncertainty modelling of the column is resulted in an LFT form with a four element diagonal block structure taking into account the dependence between the steady state gains. Robust analysis of the distillation column dynamics is performed and compared using µ - and l 1 -analysis tools. The magnitude of possible overshoots is determined by l 1 -test for robust performance and the dependence of this magnitude on the dominant time constant (i.e. the purity of the separation) is investigated. Futhermore the effect of the mi certainties in the time constants and the singular values on the robust performance is also analysed using l 1 -test. It has been found that the uncertainty in the time constants affects dominantly the robust performance of the open-loop system, i.e. the magnitude of possible overshoots.

关键词： Distillation column parametric uncertainty modelling robust stability robust performance

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Nonlinear predictive control of an exothermic CSTR using recursive quadratic state space models

Nonlinear predictive control of an exothermic CSTR using rec...

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IEEE Conference on control Technology and Applications (CCTA)

作者： S.C. Patwardhan K.P. Madhavan Systems and Control Engineering Indian Institute of Technology Mumbai India Department of Chemical Engineering Indian Institute of Technology Mumbai India

The possibility of using a discrete quadratic perturbation model for approximating nonlinear plant dynamics in the neighborhood of the operating point is explored in this paper. A method is evolved for computing the model coefficients using first and second order sensitivity equations. The proposed model is further used to develop a nonlinear model predictive control algorithm. The performance of the proposed control algorithm is demonstrated by simulating a benchmark CSTR control problem characterized by the change in the sign of the steady state gain in the operating region.

关键词： Predictive control Continuous-stirred tank reactor State-space methods Predictive models Nonlinear systems Steady-state Prediction algorithms Computational modeling Performance gain Electrical equipment industry

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LIFE-CYCLE DESIGN FOR IN-SITU REMEDIATIONS

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GROUND WATER MONITORING AND REMEDIATION 1995年第2期15卷 90-93页

作者： NYER, EK Evan K. Nyer is an expert in the research and application of technology to ground water cleanup. As vice president of technical resources with Geraghty & Miller Inc. (1099–18th St. Ste. 2100 Denver CO 80202) he is responsible for maintaining and expanding Geraghty & Miller's technical expertise in geology/hydrogeology engineering modeling risk assessment bioremediation and many other areas. He also provides expertise in engineering services including the design of treatment systems for contaminated water sites throughout the United States. He has designed and installed more than 100 ground water and soil remediation systems. He is a member of the Water Pollution Control Federation the National Ground Water Association the American Institute of Chemical Engineers and the American Society of Civil Engineers.

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IS THIS SITE CONTAMINATED

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GROUND WATER MONITORING AND REMEDIATION 1995年第1期15卷 71-74页

作者： NYER, EK SENZ, CD Evan K. Nyer is an expert in the research and application of technology to ground water cleanup. As vice president of technical resources with Geraghty & Miller Inc. (14497 N. Dale Mabry Hwy Ste. 115 Tampa FL 33618) he is responsible for maintaining and expanding Geraghty & Miller's technical expertise in geology/ hydrogeology engineering modeling risk assessment bioremediation and many other areas. He also provides expertise in engineering services includins the desisn of treatment systems for contaminated water sites throughout the United States. He has designed and installed more than 100 ground water and soil remediation systems. He is a member of the Water Pollution Control Federation the National Ground Water Association the American Institute of Chemical Engineers and the American Society of Civil Engineers. Charles D. Senz a senior geologist with Geraghty & Miller Inc. in Denver Colorado has more than 14 years of experience as a geologist including 8 years in the environmental field. He has managed projects performed extensive field work and written numerous reports for various hazardous waste sites CERCLA and RCRA sites and hydrocarbon-contaminated sites in the Rocky Mountain region. Senz has experience at sites impacted by volatile and semivolatile organic compounds chlorinated solvents petroleum hydrocarbons PCBs pesticides and herbicides metals and other inorganic compounds and acids and strong bases. He has also conducted and managed environmental site assessments for residential properties small and large industrial properties warehouses hotels office buildings natural gas production facilities medical facilities photo-processing facilities and large tracts of vacant land.

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Alternatives to incineration in remediation of soil and sediments assessed

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Remediation Journal 1995年第3期5卷 1-18页

作者： Exner, Jurgen H. Dr. Jurgen H. Exner is a principal at JHE Technology Systems Inc. in Alamo California where be provides litigation support and strategic consulting in hazardous waste management remediation and technology commercialization. He has 20 years of experience in assessing environmental information and developing effective solutions based on regulatory economic technical social and legal considerations. He has managed source control site investigations feasibility studies and technology demonstrations remedial design and remediation at two large engineering/remediation companies. He also has seven years of experience in process development in the chemical industry. He edited three books on hazardous waste treatment has published 36 papers and provides peer review for journals and private and government clients.

Contamination of soil and sediment by pollutants represents a major environmental challenge. Remediation of soil during the original Superfund years consisted primarily of dig and haul, capping, or containment. The 1986 amendments to CERCLA—SARA—provided the incentive for treatment and permanent remedies during site remediation. Thermal treatment, which routinely achieves the low cleanup criteria required by RCRA land‐ban regulations, became one of the major technologies used for cleanup under the concept of ARAR. As the remediation industry matured and recognized specific market niches in soil remediation, a number of new technologies emerged. Thermal desorption, bioremediation, soil vapor extraction, soil washing, and soil extraction are being used on sites at which the technology offers advantages over incineration. In addition, a continuing stream of emerging technologies is being presented that requires careful evaluation relative to existing cleanup methods. Each of these technologies offers a range of options for achieving appropriate cleanup criteria, application to different soil matrices, cost, time of remediation, and public acceptability. Balancing cleanup criteria defined by regulation or risk assessment with technology cost and capability affords the opportunity to solve these problems with appropriate balance of cost and protection of human health and the environment. Copyright © 1995 Wiley Periodicals, Inc., A Wiley Company

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