Showing papers in "International Journal of Electrical Engineering Education in 1988"
TL;DR: In this article, an accurate representation of the magnetisation curve including the incremental permeability curve is presented, based on selected powers of B (not generally integer) with positive coefficients giving a power series.
Abstract: An accurate representation of the magnetisation curve including the incremental permeability curve, is presented. It is based on selected powers of B (not generally integer) with positive coefficients giving a power series. The fit is shown to be superior to those obtained with polynomial and rational fraction polynomial representations.
44 citations
TL;DR: In this paper, a self-excited single-phase cage induction generator with discrete capacitance steps to keep the terminal voltage within specified tolerance at different loads, is developed for implementing a simple regulating scheme, where capacitance/reactive VARs requirements for the generator are obtained to maintain constant terminal voltage at various loads.
Abstract: For a self-excited single-phase cage induction generator, the possibility of few discrete capacitor steps to keep the terminal voltage within specified tolerance at different loads, is evolved for implementing a simple regulating scheme. The capacitance/reactive VARs requirements for the generator are also obtained to maintain constant terminal voltage at various loads.
37 citations
TL;DR: The specifications of URISC are given and complete implementations of its control unit are presented and the authors' experiences with the use ofURISC in the classroom environment are discussed briefly.
Abstract: URISC is a single-instruction universal computer which appears to be ideal for introducing basic computer organization concepts to novice students. In this paper, the specifications of URISC are given and complete implementations of its control unit are presented. The authors' experiences with the use of URISC in the classroom environment are discussed briefly.
36 citations
TL;DR: The rationale for teaching undergraduate electromagnetics partly through the finite element method, is put forward and helps to replace large portions of syllabi devoted to special solution methods, with problems of industrial magnitude and character.
Abstract: The rationale for teaching undergraduate electromagnetics partly through the finite element method, is put forward. Properly presented, the finite element method, easily within the ken of the engin...
9 citations
TL;DR: In this article, a Wien bridge oscillator circuit is analyzed, taking into account the finite gain-bandwidth product of the op. amp. Expressions for the oscillation frequency and its sensitivity to the op-amp gain are given.
Abstract: A Wien bridge oscillator circuit is analysed, taking into account the finite gain-bandwidth product of the op. amp. Expressions for the oscillation frequency and its sensitivity to the op. amp gain...
8 citations
TL;DR: The status and future potential of knowledge-based expert systems in relation to electrical engineering practice and education are reviewed and a generalised rule- based expert system is described.
Abstract: This paper reviews the status and future potential of knowledge-based expert systems in relation to electrical engineering practice and education. A generalised rule-based expert system is described. Uses of expert systems in the Bachelor's Degree are identified by means of examples. Software and tools are discussed.
5 citations
TL;DR: Based on control theory, a new method to investigate initial conditions induced by the application of a step command on linear or nonlinear systems is given in this article, where examples are provided to illustrate the proposed method.
Abstract: Based on control theory, a new method to investigate initial conditions induced by the application of a step command on linear or nonlinear systems is given in this paper. Examples are provided to illustrate the proposed method.
4 citations
TL;DR: A finite element program for use in the instruction of electromagnetic field theory and the unity among the various disciplines of physics through the Poisson equation is exploited to make the same program solve problems from many areas.
Abstract: A finite element program for use in the instruction of electromagnetic field theory is described. The unity among the various disciplines of physics through the Poisson equation is exploited to mak...
4 citations
TL;DR: In this paper, a self-excited induction generator connected through a controlled rectifier to a resistance load with no smoothing reactor is described, and a harmonic analysis of the rectifier input current is presented.
Abstract: The paper describes a self-excited induction generator connected through a controlled rectifier to a resistance load with no smoothing reactor. A harmonic analysis of the rectifier input current is presented. The current harmonics cause distortion of the generator voltage waveform, and the possibility of harmonic resonance exists.
3 citations
TL;DR: In this paper, the direct Laplace transform with a finite upper limit of the integral is considered for evaluation of transients when the input is an amplitude modulated cosinusoidal pulse.
Abstract: The direct Laplace transform with a finite upper limit of the integral is considered. This form is useful for evaluation of transients when the input is an amplitude modulated cosinusoidal pulse. I...
2 citations
TL;DR: The evolution of the Journal from its beginning as the Bulletin of Electrical Engineering Education, first published in 1948, through the launch of the International Journal of Electrical Education (IJEEE) in 1963 to the present time is described in this paper.
Abstract: The paper traces the evolution of the Journal from its beginning as the Bulletin of Electrical Engineering Education, first published in 1948, through the launch of the International Journal of Electrical Engineering Education (IJEEE) in 1963 to the present time.
TL;DR: The changes which have occurred in electrical engineering education over the last twenty-five years, with reference to specific articles published during the lifetime of IJEEE, are discussed in this article.
Abstract: The paper considers the changes which have occurred in Electrical Engineering Education over the last twenty-five years, with reference to specific articles published during the lifetime of IJEEE. 25 years ago courses in electrical engineering included substantial coverage of mechanical engineering topics and detailed treatment of electrical machines. Today the emphasis has shifted very considerably towards digital electronics, computer architecture, programming and computer aided design (CAD). Greater attention is paid to project work and the role of the engineer in society.
TL;DR: In this paper, the changes in semiconductor integrated circuits over the past twenty-five years are extrapolated to the next twentyfive years and the parameters that are considered are: complexity, size, speed and cost.
Abstract: The changes in semiconductor integrated circuits over the past twenty-five years are extrapolated to the next twenty-five years. The parameters that are considered are: complexity, size, speed and cost. The way Electrical Engineering Education could develop as a result of the predicted extension of computing power is discussed.
TL;DR: In this paper, the three-phase bridge convertor can be represented in the steady state by a circuit model, and the circuit model is deduced for both naturally commutated and forced convertors.
Abstract: The paper shows that the three-phase bridge convertor can be represented in the steady state by a circuit model. Circuit models are deduced for naturally commutated and forced commutated convertors. Steady state power rectification, inversion, the d.c. link, and variable frequency motor control are described.
TL;DR: In this paper, the conventional circuit model of an induction motor is modified to include a rotational e.m.f. This helps to explain induction generator action, and the required amount of residual residual energy to initiate self-excited induction generation is calculated.
Abstract: The conventional circuit model of an induction motor is modified to include a rotational e.m.f. This helps to explain induction generator action. The required amount of residual e.m.f. to initiate self-excited induction generation is calculated.
TL;DR: The application of the constrained least squares and the constrained iterative reconstruction techniques, in the frequency domain, is discussed.
Abstract: This paper points out the relevance of signal reconstruction in high voltage engineering and the advantage of considering constrained methods. The application of the constrained least squares and t...
TL;DR: Based on charge simulation technique for solving the electrostatic field problems, a method to compute the capacitance of three core belted power cables is discussed in this article, where it is shown that very accurate...
Abstract: Based on charge simulation technique for solving the electrostatic field problems, a method to compute the capacitance of three core belted power cables is discussed. It is shown that very accurate...
TL;DR: In this article, a procedure for the computation of speed-time curves during dynamic braking of a separately-excited d.c. motor was described, including the nonlinear effects of magnetic saturation and machine losses.
Abstract: A procedure is described for the computation of speed-time curves during dynamic braking of a separately-excited d.c. motor which includes the non-linear effects of magnetic saturation and machine losses. The application of the procedure to student assignment work is briefly discussed.
TL;DR: This lengthy text brings together the collective research of Liskov and Guttag over the last ten or more years and finds that although the design, specification and implementation techniques presented are usable in engineering non-sequential systems, they need supplementing to handle the more general case.
Abstract: ion and Specification in Program Development: B. LISKOV and 1. GUTTAG (MIT Press, 1986,469 pp., $32.50) This lengthy text brings together the collective research of Liskov and Guttag over the last ten or more years. Using Liskov's language, CLU, the usual issues of procedural and data abstractions are dealt with. These are followed by specification and the use of formal specifications in program testing and verification. Surprisingly the issues of program design are delayed until these techniques have been presented, rather than before: an unexpectedly bottom up approach to the explanation of what is essentially a top down process. The major example used in the text is a document formatter, indistinguishable from that used in Liskov's paper in LNCS 86 (published 1980) and an appendix contains a number of comprehensively worked examples. A serious omission is any acknowledgement of concurrent or distributed systems. The programs presented are entirely operational and sequential. This is unfortunate, because although the design, specification and implementation techniques presented are usable in engineering non-sequential systems, they need supplementing to handle the more general case.
TL;DR: Francis N-Nagy and Andreas Siegler have produced that rare animal, an excellent introductory textbook suitable for use both as the recommended volume in a taught course or for home study by engineers newly involved with aspects of manipulator design.
Abstract: deserves a place among the best of these in terms of achieving such an aim. It is well written and copiously iIlustrated with clear diagrams and photographs. It also includes many worked examples and the paperback price puts it within reach of the majority of students. Unlike many of its counterparts, it does not attempt comprehensive coverage of all aspects of flexible automation, (an approach which frequently results in a low-level text suitable for background reading and little else) but concentrates specifically on the design, modelling and control of the actual manipulator with chapters covering the appropriate mathematics, coordinate systems, descriptions of manipulative tasks and the modelling and inverse modelling of the robot kinematics. Each chapter presents a concise statement of the necessary techniques with complex theoretical/mathematical results sensibly relegated to local appendices. This is followed by illustrative examples based, in many cases, on commercial manipulators. I was particularly impressed by the use, in the introduction, of line drawings paired with photographs to iIlustrate the various robot configurations in use. Comprehensive lists of references are supplied at the end of each chapter. In summary Francis N-Nagy and Andreas Siegler have produced that rare animal, an excellent introductory textbook suitable for use both as the recommended volume in a taught course (final year undergraduate or first year postgraduate level) or for home study by engineers newly involved with aspects of manipulator design. GAYNOR TAYLOR, Department ofElectronic Engineering, University ofHull
TL;DR: This paper gives a numerical example of a stability study of an alternator connected to an infinite bus through a transmission line and is intended to be the basis of exercises submitted to students for a computer solution.
Abstract: The authors give a numerical example of a stability study of an alternator connected to an infinite bus through a transmission line. Possible reductions of the model are carefully considered. This paper is intended to be the basis of exercises submitted to students for a computer solution.
TL;DR: In this paper, the authors focus on a small subset of this vast subject: various approaches (in both the time domain and frequency domain) for realizing linear minimum-phase systems, linear non-minimum phase systems, and bilinear systems are presented and particular attention is paid to the problem of developing numerically efficient algorithms for obtaining reduced-order (approximate) stochastic realization.
Abstract: is, therefore, rather misleading. To quote the preface: 'The subject of modelling and application of stochastic processes is too vast a subject to be exhausted in a single volume. In this book, attention is focused on a small subset of this vast subject: Various approaches (in both the time domain and frequency domain) for realizing linear minimum-phase systems, linear nonminimum-phase systems, and bilinear systems are presented and particular attention is paid to the problem of developing numerically efficient algorithms for obtaining reduced-order (approximate) stochastic realization. On the application side, chapters on the use of Markov random fields for modelling and analyzing image signals, use of complementary models for the smoothing problem with missing data, and nonlinear estimation are included. The material presented is for researchers in the field and little quarter is given to outsiders who may be seeking an introduction to the area. Those who persist must be mathematically well-armed (particularly with linear algebra) and be prepared to follow up the many references at the end of each paper. No effort has been made to unify the material so that we are also faced with a multitude of typefaces and notations. Having said this, the material presented in each paper is of excellent quality but, given its fragmented nature, would perhaps have been more appropriate to a special issue of one of the research journals. Nevertheless and even at £55 I would recommend it to researchers in the field. Chapter headings: Nested orthogonal realizations for linear prediction of ARMA processes; q-Markov covariance equivalent realizations; reduced-order modelling of stochastic processes with applications to estimation; generalized principal components analysis and its application in approximate stochastic realization; finite-data algorithms for approximate stochastic realization; model reduction via balancing, and connections with other methods; the scattering matrix associated with a stationary stochastic process: system theoretic properties and role in realization; realization and reduction of S.LS.O. nonminimum phase stochastic systems; on stochastic bilinear systems; Markov random fields for image smoothing with blackouts; stochastic bilinear models and estimators with nonlinear observation feedback. M. B. ZARROP, Control Systems Centre. UMIST
TL;DR: A simple circuit is described which can be used for both ASK and PSK operations on a sinusoidal carrier signal and the circuit developed is found very useful for laboratory demonstrations.
Abstract: A simple circuit is described which can be used for both ASK and PSK operations on a sinusoidal carrier signal. The same circuit can also be used for delta modulation. The circuit developed is found very useful for laboratory demonstrations. Experimental results are quite satisfactory.
TL;DR: In this paper, a wide range of circuit ideas to electronics engineers, hobbyists and project students, at all levels, who might be involved in electronic circuit design and development, and who require easily-assimilated information on solid-state electronic-oscillator circuits and some of their design equations.
Abstract: In summary, this book offers a wide range of circuit ideas to electronics engineers, hobbyists and project students, at all levels,who might be involved in electronic circuit design and development, and who require easily-assimilated information on solid-state electronic-oscillator circuits and some of their design equations. BRIAN M. SHAW, Division ofElectrical and Electronic Engineering. Hatfield Polytechnic
TL;DR: A simple and compact circuit is described which can be used to generate the various forms of signals representing binary data simultaneously and is quite useful for laboratory demonstration and testing.
Abstract: A simple and compact circuit is described which can be used to generate the various forms of signals representing binary data simultaneously. It is quite useful for laboratory demonstration and testing. The experimental results are found quite satisfactory.
TL;DR: This contribution describes a relational database reference management system augmented with purpose-built information analysis software that allows rapid publication of outstanding research results, increased sensitivity to current issues and the rapid accumulation of material for advanced courses.
Abstract: This contribution describes a relational database reference management system augmented with purpose-built information analysis software. The benefits which have accrued from the use of this facility include: rapid publication of outstanding research results, increased sensitivity to current issues and the rapid accumulation of material for advanced courses.
TL;DR: This paper describes a first year project introducing practical aspects of work with electronic circuits, and students themselves design the analogue interface necessary to link this to a specified transducer.
Abstract: The paper describes a first year project introducing practical aspects of work with electronic circuits. A simple Z80-based microcontroller forms the core of the system and students themselves desi...
TL;DR: Diese Arbeit beschreibt ein praktischen Ubungsbestandteil in den Unterricht der Technik durch Entwiirfe, Planaufgaben, Laboratoriumsarbeiten etc, einzufiihren.
Abstract: Unterricbt durcb Planaufgaben: Entwurf, Bau ODd Priifung ,on Transformatoren Es ist von entscheidender Bedeutung, einen praktischen Ubungsbestandteil in den Unterricht der Technik durch Entwiirfe, Planaufgaben, Laboratoriumsarbeiten etc, einzufiihren. 1m N.T.I. haben wir durch Einfiihrung von Selbstiemen fiir zweitjiihrige Studenten eine neue Seite der technischen Ausbildung eingeleitet. In diesem Zeitraum fiihren Studenten verschiedene Planaufgaben aus, die Entwurf, Bau und Priifung von Erzeugnissen in sich schliessen. Diese Arbeit beschreibt eine dieser Planaufgaben.
TL;DR: The Blondel circle diagram is shown to be ideal for illuminating the steady-state behaviour and limitations of small brushless system, at a level suitable for undergraduate courses.
Abstract: Brushless drives are important, but are often thought to be difficult to treat quantitatively at the undergraduate level. The Blondel circle diagram is shown to be ideal for illuminating the steady-state behaviour and limitations of small brushless system, at a level suitable for undergraduate courses.
TL;DR: In this paper, the reviewer has, in my opinion, confused examples included in SIGMA to demonstrate particular effects with limitations in the software, and the example on leakage in the SIGMA manual produces a distorted spectrum not because of software limitations but because of leakage.
Abstract: Dear Sir, I read with interest the Software Review of SIGMA AND HARM in IJEEE 25/2, April 1988. We have been using both of these packages for the last two years, in particular SIGMA, at final year undergraduate level. The reviewer has, in my opinion, confused examples included in SIGMA to demonstrate particular effects with limitations in the software. The example on leakage in the SIGMA manual produces a distorted spectrum not because of software limitations but because of leakage. Yours faithfully, F. J. SWIFT Department ofElectrical and Electronics Engineering, Manchester Polytechnic.