# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 26
• ### Theory of imperfectly conducting thin cylindrical dipoles

Publication Year: 1970, Page(s):2205 - 2208
Cited by:  Papers (1)
| | PDF (497 KB)

A method is proposed for the analysis of thin cylindrical dipoles with nonzero internal impedance per unit length. Current distribution along the dipole is approximated by a polynomial with complex coefficients. The method is applicable to dipoles with arbitrary internal impedance per unit length (which must, however, be constant along the dipole), but particular attention is devoted to purely res... View full abstract»

• ### C.W. sounding and its use for control of h.f. (3-30MHZ) adaptive systems for data transmission

Publication Year: 1970, Page(s):2209 - 2215
Cited by:  Papers (1)
| | PDF (775 KB)

A theoretical analysis is presented in which the phase pertubations of the sounding signal due to ionospheric propagation are interpreted into a phase-errorÂ¿ rate. An indication of how this may be used to assess the likely error rate associated with an information channel using that frequency is also given. The paper describes how the sounding technique will be used to control the time at which ... View full abstract»

• ### Linear theory of the acoustoelectric oscillator

Publication Year: 1970, Page(s):2216 - 2220
| | PDF (568 KB)

A linear 1-dimensional theory is given for the acoustoelectric oscillator. In this device, a direct current is passed through a plate of piezoelectric material sandwiched between two electrical contacts. Oscillations occur at frequencies near the natural acoustic frequencies of the plate when the round-trip gainÂ¿ exceeds unity. All five waves are included in the theory, and the effects of the ex... View full abstract»

• ### High-efficiency low-frequency operating modes in avalanche diodes under low-current-density conditions

Publication Year: 1970, Page(s):2221 - 2227
Cited by:  Papers (1)
| | PDF (854 KB)

A theoretical model of the avalanche-diode oscillator, based on Read's analysis is developed. It is shown that, with appropriate circuit constraints, a complex voltage waveform appears across the device terminals and high-efficiency low-frequency oscillations occur. The model is applicable at low current densities and the effects of carrier space charge on the electric-field distribution within th... View full abstract»

• ### Multiparameter sensitivity problems in network theory

Publication Year: 1970, Page(s):2228 - 2236
Cited by:  Papers (9)
| | PDF (1275 KB)

The paper presents a survey of the literature as it pertains to the problem of multiparameter sensitivity in network theory. In particular, a critical appraisal is made of several multiparameter sensitivity functions, and the problems involved in their computation are considered. Several procedures for their evaluation are described, with attention focused on the auxilliary network approach of Lee... View full abstract»

• ### Calculation of the absorption coefficient of a thin spherical resistive shell

Publication Year: 1970, Page(s):2236 - 2238
| PDF (416 KB)
• ### Effect of the hall field in a rectangular waveguide containing semiconducting material

Publication Year: 1970, Page(s):2238 - 2240
Cited by:  Papers (1)
| PDF (304 KB)
• ### Forces in induction motors with laterally asymmetric sheet secondaries

Publication Year: 1970, Page(s):2241 - 2248
Cited by:  Papers (9)
| | PDF (782 KB)

An analysis is presented for the problem of the sheet-secondary induction motor when the sheet is displaced sideways from a symmetrical position. It is shown that the forces which act on the sheet are decentralising and that the magnitude of these forces and of the changes in propulsive force and winding impedance are dependent on five dimensionless parameters which are functions of the motor's de... View full abstract»

• ### Investigation into damping-torque coefficients and stability of a 2-synchronous-machine system employed in synchronous starting

Publication Year: 1970, Page(s):2249 - 2256
Cited by:  Papers (1)
| | PDF (936 KB)

The region of minimum damping for a 2-machine system, which occurs at low speeds, in which self-excited hunting may take place is investigated. Under certain circumstances, it is shown that, even where machines are provided with satisfactory damper windings, negative-damping phenomena may be exhibited. A transfer function for a 2-machine system is set up to which various stability criteria may be ... View full abstract»

• ### Application of dimensional analysis to flashover characteristics of polluted insulators

Publication Year: 1970, Page(s):2257 - 2260
Cited by:  Papers (12)
| | PDF (549 KB)

In the paper, the method of dimensional analysis is applied to determine the flashover characteristics of polluted insulators. Expressions deduced for the flashover voltage in a d.c. circuit under simplified conditions are found to agree with the analytical findings of previous authors. The work is then extended to flashover characteristics in a.c. systems, where the dynamic properties of arcs are... View full abstract»

• ### Analysis of single-phase capacitor-input rectifier circuits

Publication Year: 1970, Page(s):2261 - 2265
Cited by:  Papers (2)
| | PDF (405 KB)

An analytical treatment of four capacitor-input rectifier circuits is outlined, and computed results are indicated. The instantaneous minimum output voltage is given as a function of the source resistance, the load resistance and the filter capacitance, for a knowledge of this quantity is essential to the design of regulated power supplies. Peak-peak voltage ripple, peak current and root-mean-squa... View full abstract»

• ### Discussion on 'Contact problems in machines using thyristor-assisted commutation'

Publication Year: 1970, Page(s):2266 - 2268
| PDF (503 KB)
• ### Discussion on "Optimum design and performance calculations of highly magnetically saturated d.c. machines for large-scale production"

Publication Year: 1970, Page(s):2269 - 2270
| PDF (357 KB)
• ### New reluctance motors with unlaminated rotors

Publication Year: 1970, Page(s):2271 - 2272
Cited by:  Papers (3)
| PDF (285 KB)
• ### On the stability of stochastic Lur'e systems with differentiable nonlinearity

Publication Year: 1970, Page(s):2273 - 2276
Cited by:  Papers (1)
| | PDF (484 KB)

The method of Popov is extended in the paper in order to derive sufficient conditions for the asymptotic stability in the mean of a Lur'e-type nonlinear feedback system having stochastic parameters in the linear part. It is assumed that the nonlinear characteristic is specified by known bounds on the slope, as well as on the sector in which it may lie. It is also assumed that the statistics of the... View full abstract»

• ### Feasibility study of Monte Carlo modelling techniques for distributed-parameter systems. Part 1: Discrete Monte Carlo models and their uses

Publication Year: 1970, Page(s):2277 - 2286
| | PDF (1247 KB)

The theory of Monte Carlo modelling of distributed-parameter systems is developed from a difference-equation representation of the relevant partial differential equations. The analogy between this approach and that based on Kolmogorov's equation is used to simplify the resulting statistical model, and a number of extensions are proposed to deal with a variety of boundary types, nonlinearities, and... View full abstract»

• ### Feasibility study of Monte Carlo modelling techniques for distributed-parameter systems. Part 2: Search problem involving a distributed-parameter system solved by Monte Carlo methods

Publication Year: 1970, Page(s):2287 - 2293
| | PDF (897 KB)

The theory given in Pt. 1 of the paper is illustrated. The paper takes, as an example of the use of Monte Carlo solutions of partial differential equations, a linear model for the heating of steel billets, and solves an optimal-control problem of achieving uniform temperature in minimum time. View full abstract»

• ### Minimum-time control of a class of linear fixed-domain systems with distributed input

Publication Year: 1970, Page(s):2294 - 2300
| | PDF (765 KB)

A generalisation of Pontryagin's maximum principle for distributed, fixed-domain systems is stated. The canonical equations which yield the minimum-time control for linear systems with quadratic-control effort constraint are then derived. These equations are solved for a class of systems. Two particular systems are then considered, and a number of computed optimal responses are given. View full abstract»

• ### IEE Conference Publication 68. Man-computer interaction

Publication Year: 1970
| PDF (136 KB)
• ### Frequency-response analysis and parameter measurement of a d.c.-excited drag-cup tachogenerator

Publication Year: 1970, Page(s):2301 - 2305
Cited by:  Papers (2)
| | PDF (582 KB)

An analysis is presented which shows how the electrical time constant of the rotor of a drag-cup tachogenerator gives rise to nonlinear characteristics with respect to mean speed and the frequency of speed variation, when used with d.c. excitation as an accelerometer. Simple and accurate methods for the measurement of the rotor time constant and for the calibration of the accelerometer are describ... View full abstract»

• ### On the absolute stability of automatic control systems

Publication Year: 1970, Page(s):2306 - 2310
| | PDF (693 KB)

Two methods prevail in the literature for establishing the frequency-stability criterion of systems containing a single nonlinearity. The purpose of the present investigation is to bridge this gap by establishing the relationship between the Popov approach and Lyapunov approach. The result, which is an extension of Lyapunov's direct method, is general in application, and it is shown that the probl... View full abstract»

• ### New observations on the formation of unduloids on wires

Publication Year: 1970, Page(s):2311 - 2314
Cited by:  Papers (1)
| | PDF (1184 KB)

The paper presents the results of an investigation of unduloid formation on hard-drawn and soft silver wires with diameters between 0.16 and 1.0mm. It has been established that unduloids only form on hard-drawn wires. Consequently, unless wire surface hardness is taken into account, the existing theories about the surface melting of current-overloaded wires may be incorrect. Furthermore, experimen... View full abstract»

• ### High-current vacuum arcs. Part 1: An experimental study

Publication Year: 1970, Page(s):2315 - 2326
Cited by:  Papers (52)
| | PDF (1882 KB)

The vacuum or metal-vapour arc between butt electrodes of 6Â¿75mm diameter, at separations up to 40mm, has been studied experimentally throughout a range of sinusoidal current loops up to 100kA peak. The appearance and properties of the copper-vapour discharge are shown to vary widely over this current range. The well known diffuse low-voltage vacuum arc which exists at a few hundred amperes devel... View full abstract»

• ### High-current vacuum arcs. Part 2: Theoretical outline

Publication Year: 1970, Page(s):2327 - 2332
Cited by:  Papers (17)
| | PDF (864 KB)

In the paper, the description of the arc plasma presented in the literature for arcs of a few hundred amperes is extended to include the plasma-interaction effects which occur at high currents. As a result, it is predicted that the arcing voltage will increase linearly with contact separation and current, and that the outline of the discharge will be diffuse and is little influenced by external ma... View full abstract»

• ### Conduction in SF6 at high electrical stresses

Publication Year: 1970, Page(s):2333 - 2335
| PDF (374 KB)

## Aims & Scope

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

Full Aims & Scope