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Electrical Engineers, Proceedings of the Institution of

Issue 3 • Date March 1970

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Displaying Results 1 - 25 of 34
  • Pulsed a.m./f.m. c.w. radar

    Publication Year: 1970 , Page(s): 485 - 492
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (952 KB)  

    A novel radar system is proposed which effectively and simply combines the respective merits of pulsed a.m. and f.m. c.w. Doppler radar, by the use of a combined a.m. and f.m. waveform. Simple waveform changes permit the radar to be adapted to suit a wide range of operational requirements. This type of radar would require computer control for its full exploitation, and it is assumed that its princ... View full abstract»

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  • Analysis of class of beacon identification-friend-foe/selective-identification-feature code-validation schemes

    Publication Year: 1970 , Page(s): 493 - 495
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (310 KB)  

    A general identification-friend-foe/selective-identification-feature code-validation scheme is described. This general class of schemes contains, as a subset, particular schemes which are in present use in military and commercial applications. For the general validation scheme, an expression for the cumulative probability of code validation on or within N interrogations (2 ¿ N < ¿) is derived... View full abstract»

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  • Computer-aided class c amplifier design

    Publication Year: 1970 , Page(s): 496 - 498
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (314 KB)  

    The paper examines a well known, frequently occuring and tedious problem in radio engineering. An algorithm is devised and a computer program based on it implemented to give a complete and rapid solution. View full abstract»

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  • U.H.F. propagation over rounded hills

    Publication Year: 1970 , Page(s): 499 - 511
    Cited by:  Papers (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1636 KB)  

    Several features of the diffraction of electromagnetic waves by large obstacles are examined both theoretically and by optical experiments using a laser source and idealised models. The underlying purpose of the work was to establish and verify, where possible, working methods of estimating the field strength in the shadows of rounded hills. The emphasis throughout is largely on the propagation co... View full abstract»

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  • Effect of observer adaptation on the results of television quality-grading tests

    Publication Year: 1970 , Page(s): 512 - 514
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (446 KB)  

    `Adaptation¿ is known to affect the results of television quality-grading tests, in the sense that observers become more critical when the average picture quality is high and vice versa. The magnitude of the effect of adaptation for a particular type of impairment is dependent on the value of an `adaptation coefficient¿ ; for the two types of impairment tested, flat random noise and a single ech... View full abstract»

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  • Some aspects of direct television reception from satellites

    Publication Year: 1970 , Page(s): 515 - 520
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (969 KB)  

    In the paper, the features of some possible systems for direct domestic reception of 12GHz television signals broadcast from satellites are discussed. Estimates of transmitter powers are derived from reasonable assumptions about the required picture quality and receiver noise figure. It is conclued that the most likely arrangement for a.m., f.m. or p.c.m. signals will consist of a 12GHz to u.h.f.(... View full abstract»

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  • Discussion on "Optimum design of local twin telephone cables with aluminium conductors"

    Publication Year: 1970
    Save to Project icon | PDF file iconPDF (140 KB)  
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  • Fast signalling in the UK telephone network

    Publication Year: 1970 , Page(s): 521 - 531
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1714 KB)  

    Recent developments in the UK telephone system have jointly resulted in a requirement for faster signalling between telephone exchanges. In a network using `Channel-associated¿ signalling, `line¿ signalling is usually effected on a link-by-link basis, and it is important to ensure that supervisory signals are repeated as quickly as possible. Fast `interregister¿ signalling commonly takes the fo... View full abstract»

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  • Circuit, cutset and path enumeration, and other applications of edge-numbering convention

    Publication Year: 1970 , Page(s): 532 - 538
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (908 KB)  

    New methods employing an edge-numbering convention are proposed for listing all circuits and cutsets of an arbitrary graph, which are an improvement over the ones recently given by Maxwell and Reed. Storage of a master path matrix, whereby the all-path matrix between any two nodes of a given graph can be derived by simple modification, is discussed. A technique for generation of all trees, includi... View full abstract»

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  • Synthesis of RC active filters using controlled sources

    Publication Year: 1970 , Page(s): 539 - 544
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (622 KB)  

    A new synthesis procedure employing only unity-gain controlled sources is introduced, by which the denominator polynomial of a voltage transfer function can be decomposed in two ways. One of these gives a prescribed pole sensitivity, the modulus and argument of which can easily be controlled. The other gives a pole sensitivity that can be optimised by Calahan's RC-RL decomposition. A modification ... View full abstract»

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  • New type of reluctance motor

    Publication Year: 1970 , Page(s): 545 - 551
    Cited by:  Papers (12)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (829 KB)  

    The principles and design method of a new type of reluctance motor are described. The rotor of the new machine has one system of flux barriers per pole pair and is nonsegmented. The machine combines the advantage of simplicity of manufacture with a performance which is satisfactory by any present standard. View full abstract»

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  • Transient equivalent circuit of the divided-winding-rotor synchronous machine

    Publication Year: 1970 , Page(s): 552 - 554
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (287 KB)  

    A divided-winding-rotor synchronous generator has been proposed by Soper and Fagg. The proposed machine shows considerable improvement in leading-power-factor stability performance, both steady-state and transient, over a conventional machine. As opposed to the very detailed simulation results presented by Soper and Fagg, the present brief paper shows that the machine is nonsalient for transient c... View full abstract»

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  • Acoustic-noise measurements on nominally identical small electrical machines

    Publication Year: 1970 , Page(s): 555 - 560
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (824 KB)  

    A considerable variation in noise data between members of a group of nominally identical small electric machines has been observed. Data for such members are here analysed by the analysis of variance to assess the relative importance of the possible sources of variability. The presentation of the noise produced by the mass-produced machines is made with the aid of statistical techniques. The error... View full abstract»

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  • Frequency response of induction motors under forced oscillations

    Publication Year: 1970 , Page(s): 561 - 566
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (535 KB)  

    This paper analyses the hunting nature of induction motors when driving oscillating loads. Proceeding from the equation of motion of the oscillating system, it is shown that the electrical torque developed by an induction motor has two components; the damping torque and the synchronising torque. Neglecting, at first, the effect of the stator resistance, and limiting the investigation to small osci... View full abstract»

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  • Optimised and mean-integral delta method for 2-machine transient-stability problem

    Publication Year: 1970 , Page(s): 567 - 572
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (534 KB)  

    The paper presents a simple, accurate and quick technique for the solution of a 2-machine transient-stability problem with negligible damping, constant input and constant voltage behind the transient reactance by an optimised delta method and a mean-integral delta method developed by the author in the paper. The technique is then applied to the solution of the swing equation with the assumption of... View full abstract»

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  • Optimum lyapunov functions and stability regions for multimachine power systems

    Publication Year: 1970 , Page(s): 573 - 577
    Cited by:  Papers (12)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (641 KB)  

    The paper is a contribution to the application of Lyapunov's theory to the analysis of transient power-system stability. The technique of the paper originates with a theorem introduced by Anderson to prove the generalised Popov criterion for multivaiable fedback systems. Explicit expressions of the Lyapunov functions and the transient-stability regions are computed for multimachine power systems. ... View full abstract»

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  • Transient response of crossbonded cable systems

    Publication Year: 1970 , Page(s): 578 - 586
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1132 KB)  

    When a step voltage is applied to only one phase, the transient overvoltages seen at the first joint of a cross bonded system may be calculated by equivalent circuits which are developed in terms of the surge impedance of the cable in the coaxial mode, the sheath-earth and the sheath-sheath surge impedances. The results are tabulated for a `tight-earth¿ model in which the three phases are confine... View full abstract»

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  • Calculation of transients on transmission lines with sequential switching

    Publication Year: 1970 , Page(s): 587 - 590
    Cited by:  Papers (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (378 KB)  

    A computationally efficient method is described by which sequential pole closure may be taken into account when integral transforms are used for the calculations of switchting phenomena. The method is used to illustrate the effects of switching-in resistors and trapped charges on the overvoltages resulting in a particular case of long-line energisation. View full abstract»

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  • Evaluation of the coefficients of the fourier series representing a voltage waveform obtained by full rectification of an integral number of sinusoidal cycles followed by an 'off period' an integral number of cycles in length

    Publication Year: 1970 , Page(s): 591 - 592
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (146 KB)  

    The program computes the amplitudes and frequencies of the harmonic analysis of a rectified voltage waveform, as may be caused, for example, by the use of thyristors in load control with integral-cycle triggering. The program is general, in the sense thath the control period ('on' time + 'off' time)may be any number of supply periods in length, and the number of 'on' periods may be any number betw... View full abstract»

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  • Economic comparisons in planning for electricity supply

    Publication Year: 1970 , Page(s): 593 - 605
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1876 KB)  

    After outlining general principles for setting up a comparison of alternatives, the paper describes the single basic concept for economic comparisons, namely, present-valuing. Present-valuing (or discounting) is essential to take account of the timing of costs and revenues (or cash flows). Three equally acceptable methods of making comparisons, commonly known as discounted-cash-flow, present-value... View full abstract»

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  • IEE North Staffordshire Sub-Centre: Chairman's address. Overhead distribution 1948ߝ1969

    Publication Year: 1970
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (188 KB)  

    First Page of the Article
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  • Analysis of thyristor-controlled single-phase loads with integral-cycle triggering

    Publication Year: 1970 , Page(s): 607 - 608
    Cited by:  Papers (24)
    Save to Project icon | PDF file iconPDF (163 KB)  
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  • Dynamic performance of synchronous machines in control systems

    Publication Year: 1970 , Page(s): 609 - 617
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (628 KB)  

    Synchronous motors appear to offer a number of advantages over induction motors when used on variable-frequency supplies for the final drive of a high-power servo. The paper examines two aspects of such drives relevant to synchronous motors when so used; limiting acceleration and frequency-response characteristics, and their dependence on certain pertinent variables such as field excitation and am... View full abstract»

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  • Extended root-locus technique for design of linear multivariable feedback systems

    Publication Year: 1970 , Page(s): 618 - 622
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (609 KB)  

    The root-locus-approximation procedure is extended to provide for the complex-plane analysis of equations which contain a term quadratic in the variable parameter in addition to the usual linear term. Such an extension will have many applications; in the paper, a discussion is given concerning the design of linear time-invariant multivariable feedback systems. It is shown that, particularly for 2-... View full abstract»

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  • Optimal model-following control-system synthesis techniques

    Publication Year: 1970 , Page(s): 623 - 627
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (710 KB)  

    The paper considers three control-system-synthesis methods in which optimisation techniques are used to design controllers that make the closed-loop system behave like a specified ideal system or model. The necessary background theory is summarised, and the techniques of real and implicit model-following are discussed, especially their practical and computational aspects. A simpler algebraic form ... View full abstract»

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Aims & Scope

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

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