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Applying multimedia technology to undergraduate engineering laboratories

computer Applications in engineering Education 1995年第3期3卷 157-157页

作者： Elsherbeni, A. Tew, M. Mokaddem, A. Electrical Engineering Department University of Mississippi University Mississippi 38677 Atef Z. Elsherbeni:received an honorary BS degree in Electronics and Communications an honorary BS degree in Applied Physics and a Meng degree in Electrical Engineering all from Cairo University Egypt in 1976 1979 and 1982 respectively and a PhD degree in Electrical Engineering from Manitoba University Canada in 1987. From January to August 1987 he was a postdoctoral fellow at the Electrical Engineering Department University of Manitoba. He joined the faculty at the University of Mississippi in 1987 as an assistant professor and advanced to the rank of associate professor in 1991. His professional interests include microstrip transmission lines and antennas scattering and diffraction numerical techniques and computer applications for electromagnetic education. Dr. Elsherbeni is a senior member of IEEE and a member of Commission B of the International Union of Radio Science (URSI). His honorary memberships include the Electromagnetics Academy and the Scientific Sigma Xi Society. Mark D. Tew:obtained his BS in Electrical Engineering with highest honors in 1971 and an MS in Electrical Engineering in 1973 from the University of Mississippi. He attended the University of Illinois at Urbana-Champaign as a TRW Doctoral Fellow and received the PhD in 1979. He joined the University of Mississippi in 1979 and was appointed associate professor in 1986. His interests lie in improving undergraduate laboratories through the incorporation of computer-aided data acquisition and introduction of multimedia. He is a senior member of IEEE and member of several honorary societies.

This article presents efforts to improve the presentation of material in high frequency, microwave, and electronics laboratories using multimedia technology. A crowded undergraduate curriculum leaves little time to dwell on difficult concepts in these areas of study, yet the laboratory experience is enhanced by greater understanding. A moderate or small-sized electrical engineering department is well suited for a one-on-one approach to teaching where close faculty—student interaction serves to fill many student needs. Even in this environment, better visualization tools may increase learning by reinforcing material introduced in the classroom. This project uses multimedia to enhance instruction and presentation in the high frequency, microwave, and electronics laboratories.

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A simplified real frequency independent modal transformation for overhead line switching transient computations

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European Transactions on Electrical Power 1995年第5期5卷 307-314页

作者： Papagiannis, G. Dokopoulos, P. Dipl.-Ing. Grigoris Papagiannis (1956) studied Electrical Engineering at the Department of Electrical Engineering of the Aristotle University of Thessaloniki/Greece. He received his Dipl.-Eng. degree in Electrical and Mechanical Engineering in 1979. Since 1981 he has been working as a Research Assistant at the Power Systems Laboratory of the Department of Electrical and Computer Engineering at the Aristotle University of Thessaloniki. His special interests are power systems analysis with emphasis in the computation of electromagnetic transients. (Aristotle University of Thessaloniki Department of Electrical and Computer Engineering Power Systems Laboratory P.O. Box 486 GR-54006 ThessalonikV Greece T +30 3 I/99 63 88 Fax +30 3 1/99 63 02) Prof. Petros Dokopoulos (1939) received his Dip1.-Eng. degree in Electrical and Mechanical Engineering from the National Technical University of AthendGreece in 1962 and his Ph. D. degree from the University of Brunswic W Germany in 1967. From 1962 to 1967 he was with the High Voltage Laboratory at the University of Brunswick from 1967 to 1974 with the Nuclear Research Center at Julichl Germany from I974 to I978 with the Joint European Torus. Since 1978 he is full Professor at the Department of Electrical Engineering at the Aristotle University of Thessalonikil Greece. He has worked as consultant with Brown Boveri Cie MannheidGermany Siemens AG ErlangedGermany Public Power Corporation of Greece and with the National Telecommunication Organisation of Greece. His scientific fields of interest include dielectrics power switches generators transmission systems and alternative energy sources. (Aristotle University of Thessaloniki Department of Electrical and Computer Engineering Power Systems Laboratory P.O. Box 486 GR-54006 Thessaloniki/Greece T + 3031/996321 Fax +3031/996302)

Modal transformation technique is a common tool for transmission line transient computations. A simplified modal decomposition of overhead transmission lines, suitable for time‐domain switching (up to 10⁵ Hz) transient computations, is proposed. By neglecting residual terms in the ZY matrix, transformation matrices are approximated as real and frequency independent. The resulting propagation constants remain unaffected from the line being transposed or not, although the existing asymmetries affect transformation matrices. The method can be extended for double circuit lines, provided they have the same configuration. Propagation characteristics, mode decoupling and travelling‐wave transmission effects have been investigated. Results are compared with those obtained from other methods in use. Copyright © 1995 John Wiley & Sons, Ltd.

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Multiagent fault‐diagnosis expert system in power systems

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European Transactions on Electrical Power 1995年第5期5卷 341-347页

作者： Wang, J.P. Trécat, J. Dr. Jianping Wang is a doctor fellow in the Faculte Polytechnique de Mons in Belgium. His current research field is parallel processing applications in power systems. Dr. Wang obtained his BS degree from Southwest Jiaotong University in P.R. Chinain 1982. From 1982 to 1990 he was appointed as an assistant lecturer. lecturer and associate professor respectively in the electrical engineering department of Southwest Jiaotong University. He obtained his Ph.D in the FacultC Polytechnique de Mons in July of 1993. (BD Dolez 3 1 FPMS B-7000 Mons Belgium T +32-65/37 41 87 Fax +32-65/37 43 00) Professor J. Trécat is a director in the power system laboratory in the Faculty Polytechnique de Mons. He obtained his Ph.D in the University of Manchester Institute of Science and Technology(UM1ST) in U.K. in 1970. He has been working in the fields of power system automation artificial intelligence application and computer vision in the Facult6 Polytechnique de Mons since 1970. He is a senior member of IEEE and he has made much contribution both in electrical engineering education and research. (BD Dolez 3 I FPMS B-7000 Mons T +32-651374185. Fax +32-6513743 00)

In order to solve the speed problem and shallow reasoning problem met in current research in fault diagnosis expert system, this paper presents a model based parallel fault diagnosis expert system for energy management systems (EMS). The Petri net model, which corresponds to the relationship between power system components and their protection systems, has been used for the inference in fault diagnosis. A multiagent parallel processing expert system, which is based on five transputers in Sun workstation, has been built for fault diagnosis purposes. The test results show that this expert system is not only fast but also has better performances. Copyright © 1995 John Wiley & Sons, Ltd.

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Audible noise in speed‐controlled inverter‐fed medium‐sized induction motors

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European Transactions on Electrical Power 1995年第1期5卷 5-13页

作者： Muster, J. Budig, P.K. Belmans, R. Geysen, W. Sattler, Ph.K. Jorg Muster (1955) studied Electrical Engineering at the Technische Hochschule Karl-Mm-StadtlGerrnany from 1974 to 1978. Till 1985 he was Assistant at the chair of Electrical Machines and Drives absolved with promotion about losses and torques of inverter supplied AC machines. From 1985 until 1988 he worked for a tool-machine factory developing high-speed AC drives. Since 1988 he is Scientific Assistant at the chair of Electrical Machines and Drives at the Technische Universität ChemnitdGermany. (TU ChemniWZwickau Dezernat 5.0 Technologietransfer Carolastr. 8 D-09 I l l Chemnitd Germany T +*** Fax +49371/686240) PeW-KlaUs Budig (1928) studied Electrical Engineering at the Technische Hochschule Dresden/Germany from 1948 till 1952. For two years he was Assistant at the chair of Electrical Machines and Drives. From 1954 he was with Sachsenwerk Dresden. He was involved in research and development of amplidyne three-phase commutator-machines DC and AC traction motors thyristor-supplied traction motors. For some years he was Chief Technologist and finally Chief Engineer. At this time he is planning the production of new types of electrical machines like hermetic-motors rolling-mill motors. hydrogenerators and fractional horsepower induction motors. 1966 he got a call as a Professor to theTechnical University at Chemnitz/Germany. His research activities are three-phase linear motors thyristor-supplied DC motors. electric cars. computation of magnetic fields multi-motor AC drives high precision drives for the submicrorneter-range. magnetic bearing and high speed AC drives. (TU ChemnitdZwickau Fachbereich Elektrotechnik Carolastr.8 D-0911 l ChemnitdGermany T+49371/5613323 Fax +49371/5613361) Ronnie J. M. Belmans (1956) received the M.Sc. degree in Electrical Engineering from the Katholieke Universiteit LeuvenBelgium in 1979 the Ph.D. degree from the same university in 1984 and the Special Doctorate in 1989. From 1979 to 1985 he was a member of the staff of the Katholieke Universiteit Leuven. Currently

The audible noise produced by three‐phase, squirrel‐cage induction motors, is caused by the space harmonics of the flux‐density distribution in the air gap of the machine. When the motor is supplied by a frequency inverter in order to control the speed, time harmonics in both current and voltage are present, yielding new components in the audible noise spectrum. In the paper, a number of motor‐inverter combinations are compared for medium‐sized induction motors (90 kW). As a reference case, the motors are supplied with a generator, delivering a variable frequency without harmonics. Theoretical explanations for the increase of the audible noise level and the additional frequency components are given. Copyright © 1995 John Wiley & Sons, Ltd.

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Product disposal and re-use issues for portable computer design

Product disposal and re-use issues for portable computer des...

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IEEE International Symposium on Electronics and the Environment

作者： C. Hendrickson L. Lave F. McMichael D. Siewiorek A. Smailagic Tse-Sung Wu Assoc. Dean Camegie Institute of Technology Department of Civil Engineering Camegie Mellon University Pittsburgh PA USA Higgins Professor of Economics and University Professor Camegie Mellon University Pittsburgh PA USA Walter Blenko Sr. Professor of Environmental Engineering Camegie Mellon University Pittsburgh PA USA Computer Science and Electrical and Computer Engineering Camegie Mellon University Pittsburgh PA USA Visiting Research Scientist Engineering Design Research Center Camegie Mellon University Pittsburgh PA USA Research Assistant. Engineering Design Research Center Camegie Mellon University Pittsburgh PA USA

Portable computers including laptops, notebooks, sub-notebooks and portable digital assistants are a rapidly growing segment of the computer market. Manufacturers of portable computers have an opportunity to win public praise and to avoid censure and liability by embracing green design and sensible product disposal systems. This paper analyzes the environmental issues associated with disposal, re-use and recycling of these machines, focusing on potential design changes to alleviate environmental burdens. Portable computers can replace larger machines, resulting in lower energy use and lower overall material demand. Since the number of portable computers purchased may be as many as 100 million over the next decade, environmental concerns become increasingly important. Portable computers use batteries with toxic components, so there are disposal or recycling problems. Another significant issue in assessment of disposal and recycling processes is the expected life time of portable computers. Machine design with capability for easy upgrade can be expected to have a longer useful life. The paper uses experience gained in several generations of wearable computer designs at Carnegie Mellon University for illustration.< >

关键词： Portable computers Marketing and sales Wearable computers computer aided manufacturing Recycling Batteries Telecommunication computing Vehicles Embedded computing Economic forecasting

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TECHNICAL ISSUES REGARDING SATELLITE PACKET-SWITCHING

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 257-267页

作者： IVANCIC, WD CHU, P SHYY, DJ National Aeronautics and Space Administration Lewis Research Center Cleveland Ohio 44135 USA. A design engineer in the Digital Technology Branch of the Space Electronics Division. He has extensive experience in satellite communications systems modulation and coding on-board switching and routeing and high speed digital design. Since joining NASA in 1982 Mr. Ivancic has been responsible for the development of a variety of matrix switch controllers ground terminal equipment numerous pieces of special test equipment a beacon controller for the SARSAT program (Search and Rescue Satellite) and a time-shared decoder for a processing satellite. In addition Mr. Ivancic has been technical contract monitor on a number of advanced communications technology contracts including the Advanced Modulation Technology Development a 5 GHz fibre-optic link and multi-programmable modem study. He was awarded the B.S.E.E. and M.S.E.E. degrees by Cleveland State University in 1982 and 1986 respectively. Cleveland State University Cleveland Ohio 44115 USA. Currently an assistant professor of Electrical Engineering Department at Cleveland State University. He obtained the M.S. and Ph.D. degrees from Iowa State University majoring in Electrical and Computer Engineering. His research interests include high-speed computer networks digital systems and neural networks applications. He is a member of Sigma Xi Phi Kappa Phi as well as the IEEE and ACM. ComSearch Reston Virginia 22091 USA. Received the B.S. degree in electrical engineering from National Chiao-Tung University Hsin-Chu Taiwan in 1983 and the M.S. and Ph.D. degrees in electrical engineering from Georgia Institute of Technology Atlanta GA in 1986 and 1990 respectively. From June 1987 to October 1987 he worked for the Department of Neurology Emory University Atlanta as a Programmer. From September 1989 to December 1989 he worked for the Advanced Development Laboratory. AMP Inc. Atlanta as a Test Engineer. From February 1990 to August 1993 he wor

Many concepts for advanced communication satellite networks have recently been proposed. Critical technical issues relating to satellite packet switching for meshed very small aperture terminal networks and broadband ... 详细信息

关键词： FAST PACKET SWITCH BISDN MESHED VSAT ON-BOARD PROCESSING

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Steady‐state modelling of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive

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European Transactions on Electrical Power 1993年第5期3卷 379-386页

作者： Hamed, S.A. Dr. Sadeq A. Hamed (1957) received his B.Sc. degree in Electrical Power Engineering from Damascus University Syria in 1980. From 1980 to 1982 he has been with the Department of Electrical Engineering at the University of Jordan Ammad/Jordan. He obtained the M.Sc. degree in Power Electronics and Systems and the PhD degree in Power Electronics from the University of Manchester Institute of Science and Technology (UMIST) Manchester/GB in 1983 and 1986 respectively. In 1986 he joined the Department of Electrical Engineering. Jordan University as an Assistant Professor. In 1991 became an Associate Professor at the same department. His research activities include modelling and simulation of AC/DC drive systems pulse-width modulation control of motor implementation of computer-controlled drive systems energy saving in the electrical drive industry. (Jordan University Department of Electrical Engineering Amman/Jordan T + 96 26/843555 - 28 13 Fax + 9626/8485 58)

With the increasing availability of power transistor switches, PWM controlled rectifiers can efficiently and economically be employed in low and medium power applications of DC drive systems. In this paper, steady‐state modelling and solution of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive is accomplished. The developed model is presented in a generalized form that is applicable irrespective of the number of pulses per supply half‐cycle. Measured and predicted parameters are shown to be very close and the model is proved to be efficient and accurate. Both continuous and discontinuous modes of operation are covered, and critical operating conditions at which the system moves from one mode to the other are thoroughly investigated. The effects of the armature inductance‐to‐resistance ratio and the chopping frequency on these critical conditions, load and line harmonics, and on the ripple contents of the armature current are also thoroughly investigated. Copyright © 1993 John Wiley & Sons, Ltd.

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Teacon--a simulator for computer-aided teaching of process control

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computer Applications in engineering Education 1993年第4期1卷 307-307页

作者： Feyo, de Azevedo, S. Oliveira, F. Cardoso, A.C. Departamento de Engenharia Química Faculdade de Engenharia Universidade do Porto Rua dos Bragas 4099 Porto Codex Portugal Sebastião Feyo de Azevedo:is an Associate Professor of Chemical Engineering at the University of Porto. He is a licenciate in chemical engineering from the University of Porto (1973) and earned his PhD in Chemical Engineering from the University of Wales (1982). His interests are in the areas of modeling optimization and process control. Departamento de Electrónica Industrial Universidade do Minho Largo do Paço 4700 Braga Portugal Filomena Oliveira:is a graduate of the Chemical Engineering Department University of Porto 1986. She earned an MSc degree in Electrical Engineering from the same University (1991). She is currently Assistant-Lecturer in the Department of Industial Electronics University of Minho and is working toward her PhD in the control of biological reactors. Departamento de Engenharia Electrotécnica e dos Computadores Faculdade de Engenharia Universidade do Porto Rua dos Bragas 4099 Porto Codex Portugal Artur Capelo Cardoso:is a Lecturer at the Department of Electrical and Computer Engineering of the University of Porto. He earned his PhD from Syracuse University in 1987. His interests are in the areas of electronics signal processing and control.

“TEACON—TEAching CONtrol” is a PC-based package for computer-aided teaching of digital control of Single Input-Single Output (SISO) systems. A large variety of processes and control actions is possible. The program simulates systems in “real time” or faster than “real time.” Process and control parameters can be changed on-line during runs. Set-point and process load can also vary according to predefined functions. The program computes the ISE, IAE, and ITAE indexes, allowing studies of controller tuning and performance. Other characteristics which enhance the simulation of real systems are the saturation of sensors and controller at 0 and 100%, the ability to superimpose noises on the measurements, and the possibility of defining dead-times associated with the measurements and with the process.

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STATISTICAL PROCESS-CONTROL FOR SOFTWARE IN THE MAINTENANCE PHASE

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NAVAL ENGINEERS JOURNAL 1993年第3期105卷 192-200页

作者： LUKE, SR JACOBS, DA REED, BM Stephen R. Luke:is a registered professional engineer in the Commonwealth of Virginia. He received his B.S. in mechanical engineering from Virginia Polytechnic Institute in 1983 and is presently pursuing a master's degree in engineering management at Old Dominion University. Mr. Luke is experienced as a test engineer at the Norfolk Naval Shipyard (1978–1989) and as a reliability/quality engineer at the Naval Undersea Warfare Center Detachment Norfolk (1989-Present). Currently he is the group leader of the RMA/QA group for the AN/SQQ-89(V) Antisubmarine Warfare System at Naval Undersea Warfare Center Detachment Norfolk. Mr. Luke is a member of ASNE IEEE (Reliability Society) and ASQC and is an ASQC certified quality engineer and reliability engineer. Derya Alasya Jacobs:is an assistant professor in the Engineering Management Department at Old Dominion University (ODU). She has a B.S. in computer science and an M.S. and Ph.D in engineering management from the University of Missouri-Rolla. Prior to joining ODU Dr. Jacobs worked as a research engineer at the Center for Technology Transfer and Economic Development at the University of Missouri-Rolla. During the same period she served as a consultant in software development for Missouri Enterprise Rolla Missouri. Dr. Jacobs' research interests are in the areas of applied artificial intelligence decision support systems operations research and computer integrated manufacturing. Billie M. Reed:is an assistant professor in the Engineering Management Department at Old Dominion University. He received a B.S. degree in mechanical engineering from Auburn University in 1971. After completing undergraduate studies Dr. Reed was commissioned as an officer in the U.S. Navy where he served in the nuclear submarine force until 1982. Following his military career Dr. Reed worked for nine years as a systems engineer and human-machine interface designer of complex interactive computer based systems for use in aircraft space and ship systems. He received his M.S. and Ph

As technology advances and our dependency on software increases, the requirement to develop the correct means to improve quality in both the deveiopment phase and the maintenance phase of software life cycle support becomes increasingly significant. The focus of this paper is on the dilemma facing software engineering in maintaining quality within the constraints of the maintenance phase. The paper further proposes that the software maintenance process can also be analvzed and improved using statistical process control (SPC) techniques. The methods discussed in this paper have been proposed for use in the Software Maintenance project at NUWC Detachment Norfolk. Upon successful testing at NUWC Detachment Norfolk, they will be forwarded to the AN/SQQ-89(V) (interagencv) Software Quality Evaluation Committee for use by other agencies which are developing and maintaining AN/SQQ-89(V) software.

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Stabilizers enhancing the frequency regulation action of HVDC links supplying weak AC systems

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European Transactions on Electrical Power 1993年第3期3卷 201-212页

作者： Maris, T.I. Lygdis, A.D. Vovos, N.A. Giannakopoulos, G.B. Theodoros I. Maris (1961) received the Diploma in Electrical Engineering from the University of Patras/Greece in 1984. In 1985 he joined the Power Systems Laboratory at the Electrical Engineering Department of the University of Patras as research assistant where he is currently working for his Ph.D. degree. His area of interest is HVDC transmission. (University of Patras Dep. of Electrical Engineering Power Systems Laboratory GR-26 500 Rion. Patras/Greece T +3061/997350 Fax +3061/997362) Athanassios D. Lygdis (1954) received the Diploma in Electrical Engineering from the University of Patras/Greece in 1979. From 1979 until 1982 he worked at the Nuclear Technology Laboratory of the University of Patras as research assistant. In 1983 he joined the Power Systems Laboratory at the Electrical Engineering Department of the University of Patras as scientific collaborator. He is now working for his Ph.D. degree in this Department. His main field of interest is power transmission by HVDC systems. (University of Patras Dep. of Electrical Engineering Power Systems Labora- tory GR-26 500 Rion Patras/Greece T + 3061/997350 Fax + 3061/997361) Nickolas A. Vovos (1951) received the Diploma degree from the University of Patras/Greece the M.Sc. degree from the University of Manchester/England Institute of Science and Technology. and the Ph.D. degree from the University of Patras in 1974 1975 1978 respectively all in Electrical Engineering. In 1976 he joined the Power Systems Laboratory at the Electrical Engineering Department of the University of Patras where he is now Associate Professor. His main fields of interest are the modeiling and the transient stability study of integrated AC/DC systems. He is a member of the IEEE Power Engineering Society and CIGRE and a registered professional Engineer and member of the Technical Chamber of Greece (University of Patras Dep. of Electrical Engineering Power Systems laboratory GR-26500 Rion Patras/Greece. T +3061/997369 Fax +3061/997362) Gabriel B. Giannakopoulos (1

Power System Stabilizers (PSS) superimposed to the basic control system of an HVDC link supplying a weak AC system, in order to enhance its frequency regulation action, are proposed. To decrease the AC voltage sensitivity at the inverter side, the basic control system of the HVDC link is proposed to operate with the rectifier under Minimum Ignition Angle (MIA) control and the inverter under Constant Current (CC) control. Inputs to the PSS are the frequency and the AC voltage deviations at the inverter side and their constant parameters are calculated using modal control technique. Detailed simulation results for a practical integrated AC/DC system are presented to evaluate the performance of the proposed control scheme. Copyright © 1993 John Wiley & Sons, Ltd.

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