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# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 30
• ### Mutual impedance between two resonant-slot radiators

Publication Year: 1971, Page(s):1535 - 1538
Cited by:  Papers (1)
| | PDF (474 KB)

The paper presents investigations on the mutual impedance between two slots placed in close proximity. An analytical expression for the mutual impedance between two parallel longitudinal resonant slots in the broad wall of a rectangular waveguide is derived from the reaction of the magnetic field due to one of the slots, with the magnetic current exciting the other slot and with discontinuities in... View full abstract»

• ### Theoretical performance of prime-focus paraboloids using cylindrical hybrid-mode feeds

Publication Year: 1971, Page(s):1539 - 1549
Cited by:  Papers (10)
| | PDF (1375 KB)

An expression is derived for the radiation pattern of a hybrid-mode field distributed over a circular aperture. The hybrid mode consists of a combination of TMm and TEm components (where m Â¿ 1) and is the type of wave which propagates in a cylindrical waveguide with an internal lossless anisotropic surface. The requirements for pattern symmetry and linear polarisation are then derived, and the fo... View full abstract»

• ### Directivity of short backfire antenna

Publication Year: 1971, Page(s):1550 - 1552
| | PDF (381 KB)

An expression for the directivity of a short backfire antenna has been derived in terms of the reflection coefficient of the plane conductor. The analysis considers only the series of images behind the surface-wave reflector and the dipole feed. Using this expression, the directivity is calculated and compared with the experimentally obtained directivity. The gain was measured in the laboratory by... View full abstract»

• ### Reflection of radio waves by the lower ionosphere at night

Publication Year: 1971, Page(s):1553 - 1561
| | PDF (1268 KB)

The available experimental data relating to the height distribution of electron concentration at night has shown the presence of a pronounced ledge of ionisation between about 80 and 90km, and thin layers at greater heights. Idealised models of the electron-density distribution have been constructed, some of which incorporate these two features. The propagation parameters for vertically polarised ... View full abstract»

• ### Experimental laser system for monitoring deformations in large radio reflectors

Publication Year: 1971, Page(s):1562 - 1568
Cited by:  Papers (3)
| | PDF (781 KB)

The design of an instrument for rapidly measuring the changes in the profile of large steerable radio reflectors is described. Its use is illustrated by measurements of the reflector deformation of the UK Science Research Council's 25m steerable aerial at Chilbolton, Hants., England, as the aerial is tilted and accelerated. The laser instrument surveys 36 points distributed on the reflector in 3s,... View full abstract»

• ### Calculation of network sensitivity and its application to network analysis

Publication Year: 1971, Page(s):1569 - 1572
Cited by:  Papers (2)
| | PDF (410 KB)

A calculation of network sensitivity is presented. In particular, it is shown that the first, higher and mixed-higher derivatives may be calculated with computational ease. The results are shown to provide a solution to the problems of repeated network analysis in which only a few network parameters are varying from analysis to analysis. The reduced computing effort involved compared with conventi... View full abstract»

• ### Influence of directional fluctuations on the gain of horizontal rhombic aerials for high frequencies

Publication Year: 1971
| PDF (127 KB)
• ### Rectilinear screw-thread reluctance motor

Publication Year: 1971, Page(s):1575 - 1584
Cited by:  Papers (10)
| | PDF (1101 KB)

The paper describes a new form of linear reluctance motor capable of operating over displacements of 1 m or more with good positional accuracy and at a relatively low speed. The main application of the motor is as a linear actuator for precise machine-tool operations. The principle of operation and the main design factors of the motor are described, together with a theoretical assessment of perfor... View full abstract»

• ### D.C. dynamic braking of induction motor with a saturistor in its rotor circuit

Publication Year: 1971, Page(s):1585 - 1592
Cited by:  Papers (5)
| | PDF (789 KB)

In this paper two methods, a graphoanalytical method and an approximate analytical method, are presented for the analysis of the d.c. dynamic braking of an induction motor with a saturistor in its rotor circuit. Both these methods take into account the saturation of the magnetic circuit of the motor and the nonlinear nature of the resistance/current and reactance/current characteristics of the sat... View full abstract»

• ### Cageless induction machine

Publication Year: 1971, Page(s):1593 - 1600
Cited by:  Papers (29)
| | PDF (911 KB)

A novel type of a.c. machine is described which has an asynchronous mode of operation but which does not rely on induced currents or losses in the rotor. It has a polyphase stator winding and a laminated rotor with directionalÂ¿ magnetic properties, and thus closely resembles a reluctance motor. In contrast to the reluctance motor, however, two rotating main fields are produced, and the machine i... View full abstract»

• ### Lyapunov methods applied to multimachine transient stability with variable inertia coefficients

Publication Year: 1971, Page(s):1601 - 1606
Cited by:  Papers (1)
| | PDF (687 KB)

The paper is a contribution to the transient-stability study of multimachine power systems by Lyapunov's direct method. The mathematical model used is more rigorous than those already taken into account in that the machines' inertia coefficients are no longer considered as constant but varying with angular speed. This constitutes a more accurate approach to the transient-stability problem. A 9-mac... View full abstract»

• ### Hybrid method for the solution of piping networks

Publication Year: 1971, Page(s):1607 - 1612
| | PDF (678 KB)

A method is described for the analysis of general fluid-flow problems in which there is a nonlinear relationship between pressure and flow. The practical application is illustrated by solving gas-distribution networks, and a comparison of different methods of ordered elimination as applied to the problem is also included. In general piping networks, the solution based on loop analysis produces the... View full abstract»

• ### Modelling of optimisation problems for diakoptical solution

Publication Year: 1971, Page(s):1613 - 1617
| | PDF (544 KB)

Engineering or economic problems can be modelled by equivalent electrical networks and conveniently solved by modern advanced techniques. This paper describes a particular electrical model made of impedances, transformers, and current and voltage sources, used to represent the general economic problem which could be solved by the powerful technique of diakoptics shown in a companion paper. The mod... View full abstract»

• ### Diakoptical optimisation of linear programming

Publication Year: 1971, Page(s):1618 - 1624
| | PDF (639 KB)

The complex and relatively undeveloped topic of the application of diakoptics to economic problems is discussed in this paper. The subject is based on the tearingÂ¿ of the electrical model developed in the companion paper. It consists of the subdivision of a given physical system into a number of independent parts and solving each one by any convenient method. The solution of the original problem... View full abstract»

• ### Thermal rating of transformers. Application of the multiflow principle to naturally cooled transformers

Publication Year: 1971, Page(s):1625 - 1629
Cited by:  Papers (2)
| | PDF (645 KB)

The thermal design of naturally cooled transformers is inherently difficult, because the designer has no direct control over the oil flow, which is determined by convective or thermosiphon circulation. Compared with the positive flow possible, both in amount and direction, with pumps, the circulation is weak and nebulous even under academically simple conditions. In the application of the multiflo... View full abstract»

• ### Detection of the commutating condition in a d.c. machine

Publication Year: 1971, Page(s):1629 - 1630
| PDF (270 KB)
• ### Optimum Lyapunov functions and stability regions for multimachine power systems

Publication Year: 1971, Page(s):1630 - 1632
| PDF (273 KB)
• ### Optimum tap ratio for voltage regulation

Publication Year: 1971, Page(s):1632 - 1633
| PDF (201 KB)
• ### Developments in amplitude-comparator techniques for distance relays and New possibilities in amplitude- and phase-comparison techniques for distance relays

Publication Year: 1971
| PDF (114 KB)
• ### Effective starting process for Newton-Raphson load flows

Publication Year: 1971
| PDF (57 KB)
• ### Sequential least-squares estimation and the electrical-network problem

Publication Year: 1971, Page(s):1635 - 1641
Cited by:  Papers (1)
| | PDF (1053 KB)

Fundamental relationships existing between the electrical-network problem and least-squares estimation theory are illustrated, and the theorems of least power associated with the equilibrium conditions of physical systems are shown to correspond to the mathematical concepts of least-squares theory. The solution of the electrical-network problem based on Kron's method of tearing and interconnection... View full abstract»

• ### Sequential formulation of the multimachine-power-system and multivariable-control-system problems

Publication Year: 1971, Page(s):1642 - 1647
| | PDF (801 KB)

A formulation of the multimachine-power-system problem is shown to incorporate inherently the form of a least-power theorem associated with a potential function related to machine power losses and network power. A piecewise solution of the transient problem is also developed based on a sequential connection of generators to the network nodes. Similar methods will have application to the decomposit... View full abstract»

• ### Pole-shifting procedure for multivariable systems using output feedback

Publication Year: 1971, Page(s):1648 - 1654
Cited by:  Papers (10)
| | PDF (776 KB)

A method is put forward for the pole allocation of linear multivariable systems using output feedback. The necessary and sufficient conditions for pole allocation are established and a method is given for calculating the output feedback matrix for attainable poles. The analysis, which is based on frequency-domain techniques, employs an equivalent single-input system to treat the multi-input system... View full abstract»

• ### Analysis and synthesis of nonlinear control systems by means of a sampled-data nonlinearity matrix

Publication Year: 1971, Page(s):1655 - 1661
Cited by:  Papers (2)
| | PDF (742 KB)

The concept of a sampled-data nonlinearity matrix is defined. It is shown that, by means of this matrix, a direct correlation can be establihed between the nonlinearity and its equivalent gain. Thus, symmetrical single-valued and/or double-valued nonlinearities, however complicated, can be transformed directly into the respective equivalent gains. This is obtained by means of linear transformation... View full abstract»

• ### Describing-function series: a new means for nonlinear-control-system analysis

Publication Year: 1971
| PDF (167 KB)

## Aims & Scope

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

Full Aims & Scope