By Topic

# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 27
• ### Solid-state subnanosecond light switch

Publication Year: 1970, Page(s):1057 - 1062
Cited by:  Papers (1)
| | PDF (744 KB)

The design and realisation of a reliable and simple subnanosecond electro-optic light switch is given. This switch is suitable for controlling a mode-locked laser, or for use as a light shutter where nanosecond or subnanosecond response is necessary. The direct-current and pulse responses of the longitudinal zcut XH2PO4 modulator are considered in detail, and an optimum design established using KD... View full abstract»

• ### New method of synthetising linear digital filters based on convolution integral

Publication Year: 1970, Page(s):1063 - 1072
Cited by:  Papers (1)
| | PDF (923 KB)

A new procedure for realising the cascade and parallel forms of digital filters is presented. The method is based on using a Taylor expansion of the input signal over each sampling interval. The results reported in the paper are largely concerned with the simplest expansion, namely that the input remains constant during the sampling period. The method is shown to be applicable to lowpass and bandp... View full abstract»

• ### Autocorrelation threshold-extension f.m. demodulator

Publication Year: 1970, Page(s):1073 - 1081
| | PDF (1216 KB)

A new type of threshold-extension f.m.-signal demodulator containing no feedback loop and no limiters is described. The f.m. signal and a delayed version of it are applied to a homoheterodyne mixer, the difference-frequency output of which is then demodulated by a synchronous-phase detector. The paper describes the basic principle of the demodulator and presents a theoretical analysis of its behav... View full abstract»

• ### Transient response of Legendre filters

Publication Year: 1970, Page(s):1082 - 1083
| | PDF (214 KB)

The object of the paper is an examination of the lowpass and highpass step and impulse responses of filters using the Legendre polynomial approximation. As in previous papers, the response data are presented in tabular and graphical form for Legendre filters of order n=1, 2,Â¿, 9, for passband tolerances of 0.5, 1, 2 and 3dB. The salient features of the transient response of the Legendre filters a... View full abstract»

• ### Simple method of analysing arrays of thin cylindrical dipoles

Publication Year: 1970, Page(s):1084 - 1088
| | PDF (580 KB)

A simple and fairly accurate method is presented for determining directly impedances and feeding conditions for an array of dipoles, resulting approximately in a desired radiation pattern. The method is applicable to arrays of identical thin centre-fed cylindrical dipoles, and lends itself particularly to the design of medium-wave antenna arrays. It is assumed that dipoles are parallel, nonstagger... View full abstract»

• ### Theoretical efficiencies of class-D power amplifiers

Publication Year: 1970, Page(s):1089 - 1090
Cited by:  Papers (9)
| | PDF (258 KB)

The theoretical efficiencies of class-D amplifiers are compared with those of conventional amplifiers by means of a power balance. As a result of certain similarities, it is suggested that class-AD and class-BD modes of operation should be defined. The class-D amplifier converts the collector dissipation of a conventional amplifier into load power components at a large number of modulation frequen... View full abstract»

• ### Discussion on 'Basis for mathematical theory of direction-defining radio beacons'

Publication Year: 1970, Page(s):1091 - 1092
| PDF (240 KB)
• ### Computer study of ion-trapping instability in microwave tubes

Publication Year: 1970, Page(s):1093 - 1097
Cited by:  Papers (1)
| | PDF (646 KB)

Microwave tubes are known to exhibit low-frequency instabilities due to ion bunching. These instabilities are treated theoretically for an idealised model in two dimensions. The problem is rendered soluble by using supersized charge carriers whose equations of motion are formulated exactly by using complex variable techniques. These equations of motion are integrated numerically to obtain a comple... View full abstract»

• ### Small-hole coupling of resonant cavities and waveguides

Publication Year: 1970, Page(s):1098 - 1104
Cited by:  Papers (10)
| | PDF (755 KB)

General formulas and equivalent circuits are given for a resonant cavity coupled to the end plane of a wave guide, inserted between two waveguides, and coupled to the sidewall of a waveguide. The aperture, the cavity and the waveguides are of arbitrary shape. View full abstract»

• ### Rack-and-pinion motors: hybrid of linear and rotary machines

Publication Year: 1970, Page(s):1105 - 1112
Cited by:  Papers (4)
| | PDF (1517 KB)

The field over an open-sided linear motor contains a rotating component which can be used to spin rotors of a variety of types. If the field of the linear motor is visualised as a magnetic riverÂ¿, the motion is analogous to a mechanical rack and pinion. The paper concentrates on reluctance- and hysteresis-type rotors which can develop substantial torque in small sizes. It is shown that the possi... View full abstract»

• ### Low-speed brushless alternating-current motor

Publication Year: 1970, Page(s):1113 - 1117
Cited by:  Papers (1)
| | PDF (667 KB)

Following the discovery that a steel rod can be made to roll along the surface of a linear induction motor in the same direction as that of the travelling magnetic field, the phenomenon was investigated with a view to the development of a low-speed high-torque brushless a.c. motor. It was found that the torque was increased when the rod rolled at an angle to the direction of the field. The paper d... View full abstract»

• ### Developments in amplitude-comparator techniques for distance relays

Publication Year: 1970, Page(s):1118 - 1124
| | PDF (708 KB)

The paper reports the development of new amplitude-comparator techniques which allow the instantaneous comparison of the amplitude of the signals derived from primary line quantities. These techniques are used to derive a variety of impedance characteristics. The merits of the new relaying system are: the simple mode of the relay circuitry, the derivation of closed polar characteristics (i.e. quad... View full abstract»

• ### Discussion on "Surge-transference characteristics of generator-transformer installations" and "Surge transfer through transformer-generator units"

Publication Year: 1970, Page(s):1125 - 1128
| PDF (708 KB)
• ### Calculation of machine end-winding inductances with special reference to turbogenerators

Publication Year: 1970, Page(s):1129 - 1134
Cited by:  Papers (14)
| | PDF (936 KB)

A simple numerical procedure for the determination of the self and mutual inductances of coils of arbitrary shape is presented. The basic method involves the use of a digital computer and is capable of yielding results of very high accuracy. For application to machine end windings, the influences of the various permeable and/or eddy-current-carrying boundaries near the end coils (i.e. core end, co... View full abstract»

• ### Discussion on "Thyristor control of a multiload system with d.c. supply"

Publication Year: 1970, Page(s):1135 - 1136
| PDF (298 KB)
• ### Asynchronous tests for D and Qaxis subtransient time constants

Publication Year: 1970, Page(s):1137 - 1142
Cited by:  Papers (1)
| | PDF (729 KB)

The paper draws attention to difficulties in measuring the subtransient time constants, which are relatively fast in machines with rated outputs of the order of tens to hundreds of kilowatts. The frequency-response approaches, consisting of asynchronous tests with field open- and also short-circuited, are proposed as the most suitable test methods, and corrections for resistance effects are develo... View full abstract»

• ### Effect of harmonics on hunting of synchronous machines

Publication Year: 1970, Page(s):1143 - 1150
Cited by:  Papers (1)
| | PDF (711 KB)

Existing analyses of small oscillations in synchronous machines are based on the 2-axis theory, which assumes an idealÂ¿ machine defined by Park and Kron. Real machines, however, have been shown to depart considerably from the Park-Kron definition in that windings produce m.m.f. harmonics in addition to the fundamental, and air-gap permeance harmonics higher than the second are significant. The e... View full abstract»

• ### Economic comparisons in planning for electricity supply

Publication Year: 1970
| PDF (156 KB)
• ### Losses in roebel bars: reactance of slot portion to circulating currents between the conductor stacks

Publication Year: 1970, Page(s):1151 - 1152
| PDF (202 KB)
• ### Transfer-function matrix approach to observer design

Publication Year: 1970, Page(s):1153 - 1155
Cited by:  Papers (3)
| | PDF (290 KB)

The properties of the Luenberger observer are developed in a straightforward manner from the transfer function-matrix viewpoint, and an algorithm is presented for the generation of a class of least-order observer designs. These developments, with the observation that a dual of the observer can be used to supply additional plant inputs, should lead to new techniques for the design of dynamic compen... View full abstract»

• ### Transient response of Euler-Cauchy-type time-varying nonlinear systems using multidimensional Mellin transforms

Publication Year: 1970, Page(s):1156 - 1160
| | PDF (392 KB)

The paper presents a new method of obtaining the transient response of Euler-Cauchy-type time-varying nonlinear systems. The use of multidimensional Mellin transforms makes it easier to obtain the system response in the form of a functional power series of the Volterra type. The method of solution is applied to a physical control problem involving time-varying parameters, and the system response i... View full abstract»

• ### Optimum solution of model-reduction problem

Publication Year: 1970, Page(s):1161 - 1165
Cited by:  Papers (58)
| | PDF (516 KB)

Conditions are given for synthetising a reduced model for a multivariable time-invariant linear system by minimising a functional of the error between the output vector of the reduced model and the original model. It is shown that, when the system has a single output or single input and the eigenvalues of the reduced model are specified, the synthesis simplifies to a linear problem. A simple examp... View full abstract»

• ### Numerical solution of 2nd-order hyperbolic partial differential equations by the method of continuous characteristics

Publication Year: 1970, Page(s):1166 - 1174
| | PDF (831 KB)

The paper is concerned with two possible numerical variations based on the use of characteristics, and the results obtained provide a basis for comparison with an analogue method described in another paper. The more common approach of differencing along both sets of characteristics and solving at the characteristic-grid points is compared with the alternative approach of numerically solving the or... View full abstract»

• ### Analogue solution of 2nd-order hyperbolic partial differential equations by method of continuous characteristics

Publication Year: 1970, Page(s):1175 - 1184
| | PDF (1008 KB)

Hybrid methods based on the method of characteristics are developed for the solution of three different forms of hyperbolic differential equations. The techniques developed extend the early work of Hartree. It is shown that linear equations may be solved by a conventional analogue machine with iterative logic. Nonlinear problems require, in addition, the use of generalised integrators. Solutions o... View full abstract»

• ### The sixtieth Kelvin Lecture. The pursuit of measurement

Publication Year: 1970, Page(s):1185 - 1191
| | PDF (1169 KB)

First Page of the Article
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