# Electrical Engineers, Proceedings of the Institution of

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Displaying Results 1 - 14 of 14
• ### Inverse scattering theory and profile reconstruction

Publication Year: 1979, Page(s):945 - 950
Cited by:  Papers (10)
| |PDF (849 KB)

An analytic method for the reconstruction of the profiles of refractive indexes of inhomogeneous, stratified regions is presented. The reflection coefficient r(k) for time-harmonic electromagnetic waves is represented as a rational function of k, the wave number. 1-dimensional inverse scattering theory has been applied to obtain analytic, closed-form expressions for the profile functions q(x) from... View full abstract»

• ### Ice-crystal depolarisation on satelliteÂ¿earth microwave radio paths

Publication Year: 1979, Page(s):951 - 960
Cited by:  Papers (10)
| |PDF (1362 KB)

This paper reviews the experimental measurement of crosspolarisation on satellite-earth paths, describes the identification of previously unexpected depolarisation by ice crystals, and outlines the theoretical explanations of ice depolarisation which have been reported in the literature. It summarises what is known, and what is not yet understood, about ice-crystal depolarisation. The paper discus... View full abstract»

• ### Simplified algorithm for correcting both errors and erasures of Reed-Solomon codes

Publication Year: 1979, Page(s):961 - 963
Cited by:  Papers (3)
| |PDF (290 KB)

Using a finite-field transform, a simplified algorithm for decoding Reed-Solomon codes is developed to correct erasures as well as errors over the finite-field GF(qm), where q is a prime and m is an integer. If the finite-field transform is a fast transform, this decoder can be faster and simpler than a decoder that uses more conventional methods. View full abstract»

• ### Synthetic test methods of high-direct-current circuit breaker

Publication Year: 1979, Page(s):965 - 970
Cited by:  Papers (3)
| |PDF (822 KB)

Synthetic interruption test methods for a high-direct-current circuit breaker are investigated. The test method, which adopted a capacitor bank for a voltage supply, was recognised to be equivalent to a practical system. Finally, with this test method, a d.c. circuit breaker with vacuum interrupters was tested up to 130 kA/44 kV. View full abstract»

• ### The truth about airgap leakage reactance in polyphase squirrel-cage induction motors

Publication Year: 1979, Page(s):971 - 978
Cited by:  Papers (2)
| |PDF (965 KB)

The paper examines the validity of the theory arrived at by some authors, notably Alger, that the airgap leakage reactance of a polyphase squirrel-cage induction motor consists of two separate entities, namely, the zig-zagÂ¿ reactance and beltÂ¿ leakage reactance. The paper shows that not only the lower-order primary airgap m.m.f. harmonics have equal and opposing m.m.f.s induced in the secondar... View full abstract»

• ### Transient performance of linear induction machines following reconnection of supply

Publication Year: 1979, Page(s):979 - 983
Cited by:  Papers (3)
| |PDF (665 KB)

A frequency-domain approach for the transient modelling of a voltage-fed, double-sided sheet-secondary-type linear induction motor (l.i.m.) is discussed. The problem of sudden reconnection of the l.i.m. in the motoring and braking modes at different operating speeds is analysed using discrete Fourier transforms. Attention is focused on the transient currents and thrust pulsations immediately follo... View full abstract»

• ### Nonlinear stabiliser design applied to microalternator system

Publication Year: 1979, Page(s):984 - 990
Cited by:  Papers (1)
| |PDF (832 KB)

A method for designing stabilisers for high-speed static exciters which includes the systems nonlinearities and allows for nonlinearities in the stabilisers is presented. The method combines the use of nonlinear-optimal-control techniques and system-identification techniques to design flexibly structured stabilisers based on readily available outputs of the system. The method also allows the combi... View full abstract»

• ### New type of test for connectors to be used on aluminium conductors

Publication Year: 1979, Page(s):991 - 994
Cited by:  Papers (2)
| |PDF (703 KB)

The basis and details are given of an accelerated lifetime-test procedure for assessing connectors on aluminium conductors. This test is designed to reproduce the degradation over the service lifetime, and the failure criterion is based upon the resistance values which would lead to failure in service. A large number of connectors can be tested, and this is shown to be essential if a reasonable de... View full abstract»

• ### Generalised polyphase fault-analysis program: calculation of cross-country fault

Publication Year: 1979
Cited by:  Papers (10)
| |PDF (675 KB)

A general computer program using the phase co-ordinate technique has been developed for analysing series, shunt and simultaneous faults on balanced and unbalanced polyphase electrical networks. The program eliminates the need for maintaining numerous fault analysing subroutines, one for each kind of fault, and makes the solution of many difficult and previously unsolvable problems possible. It is ... View full abstract»

• ### Continuous alternating-voltage resulation using a thyristor bridge

Publication Year: 1979, Page(s):1002 - 1004
Cited by:  Papers (2)
| |PDF (291 KB)
• ### Optimal output feedback by gradient methods with optimal stepsize adjustment

Publication Year: 1979, Page(s):1005 - 1007
| |PDF (299 KB)

One of the major drawbacks to the use of gradient algorithms for the design of output-feedback controllers is the possibility of closed-loop instability following a step in the gain-parameter space. An algorithm is proposed which obtains optimal stepsizes at each stage of a gradient search, and automatically tests for and avoids unstable values of the gain parameters. View full abstract»

• ### Electromagnetic control of flexible transmission shaft vibrations

Publication Year: 1979, Page(s):1008 - 1010
| |PDF (389 KB)

Rotor-bearing systems operating at high speeds present severe problems when passing through their critical speeds. This paper describes a method for controlling the vibrations using electromagnets to provide a velocity-dependent controlled external forcing to increase the overall damping within the rotor-bearing system. View full abstract»

• ### Diagonal dominance and the method of pseudodiagonalisation

Publication Year: 1979, Page(s):1011 - 1017
| |PDF (778 KB)

Very little practical guidance has been forthcoming on achieving a diagonally-dominant system prior to controller design, using either the Nyquist or inverse-Nyquist multivariable design techniques. In this reappraisal of pseudodiagonalisation and diagonal dominance, a linear space setting is used as a framework for the existing technique of Rosenbrock and several new related optimisations. The re... View full abstract»

• ### Identification of factorable Volterra systems

Publication Year: 1979, Page(s):1018 - 1024
| |PDF (736 KB)

Identification of systems which can be represented as a finite sum of factorable Volterra kernals, each composed of individual linear dynamic subsystems, connected in parallel with outputs multiplied in the time domain, is considered. Both a multilevel-testing and a sequential-single-test procedure are derived to isolate each factorable kernel, and algorithms, which provide estimates of the indivi... View full abstract»

## Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

Full Aims & Scope