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Transactions of the American Institute of Electrical Engineers, Part II: Applications and Industry

Issue 5 • Date Nov. 1953

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Displaying Results 1 - 17 of 17
  • The synthesis of ¿¿optimum¿¿ transient response: Criteria and standard forms

    Publication Year: 1953, Page(s):273 - 288
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1323 KB)

    Methods for synthesizing servomechanisms are reviewed, and it is pointed out that stability criteria, frequency, and root-locus methods reduce to conditions on the transfer-function constants. These may be made mathematically specific following Whiteley's suggestion of ¿¿standard forms.¿¿ Eight mathematical criteria for optimum transient responses are critically examined, and the clear superiority... View full abstract»

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  • Approximation of transient response from frequency response data

    Publication Year: 1953, Page(s):289 - 291
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (267 KB)

    A relatively short method yielding the time response to an impulse-input from the Nyquist or Bode presentation of the real frepuency open-loop response is outlined. This method has been found to give good agreement for linear feedback systems up to and including those having fifth-order closed-loop transfer functions. View full abstract»

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  • A relative damping criterion for linear systems

    Publication Year: 1953, Page(s):291 - 295
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Many feedback controls and other physical systems are designed on the basis of linear theory, that is, linear differential equations with constant coefficients. A. Leonhard1¿3 and A. Vazsonyi4 have given graphical methods for determining whether all roots of the characteristic equation are located within certain sectors of the complex plane. Vazsonyi's method determines whether all dimensionless ... View full abstract»

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  • Automatic control of gas turbines for natural gas pipeline pumping

    Publication Year: 1953, Page(s):295 - 300
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB)

    In an expansion era in the natural-gas pumping field, rivaling the building of the railroads, considerable interest has developed in the application of gas turbines, driving centrifugal compressors, for the pumping of natural gas. Since overall system reliability and continuity of service are the watchwords in natural gas pumping, the gas turbine fulfills all requirements. Its features ¿ relative... View full abstract»

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  • Review of grounding practices on 480-volt portable distribution systems in strip mines

    Publication Year: 1953, Page(s):300 - 304
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (407 KB)

    A number of unfortunate experiences in the past, resulting in the loss of lives, have made many persons conscious of the hazards which can exist on the high-voltage systems serving strip-mining operations. Several years ago a system design employing the neutral grounding resistor was adopted. This has greatly minimized the number of shock accidents caused by equipment and cable failures. View full abstract»

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  • The magnetic-amplifier controlled log-carriage drive and the basic duty cycle of carriage performance

    Publication Year: 1953, Page(s):305 - 314
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1175 KB)

    The drive for the log carriage is probably the most important of all sawmill drives. The mill's output is directly related to the speed and agility with which the carriage will respond to the sawyer's needs. The carriage represents a load of high inertia, and to propell it at required degrees of acceleration, deceleration, and speed demands large amounts of power. In making electric log-carriage a... View full abstract»

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  • The spreading and interface resistances of electric contacts

    Publication Year: 1953, Page(s):314 - 323
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (949 KB)

    In almost every electric circuit there axe one or more places where current passes from one continuous metal body to another across the interface separating the two. The presence of the interface introduces an additional resistance into the circuit, and this additional resistance has for many years been called contact resistance. For over a century the contact resistance was thought to arise entir... View full abstract»

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  • Errors in relay servo systems

    Publication Year: 1953, Page(s):323 - 328
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (550 KB)

    This paper presents some of the errors that are present in a nonlinear second-order feedback-control system. In order to investigate some of the errors that exist in a piece-wise (See Appendix for definitions) linear control system, the phase-plane method of analysis is used. Along with a description of some of the errors that exist, equations are presented for determining these errors, and curves... View full abstract»

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  • Effects of friction in an optimum relay servomechanism

    Publication Year: 1953, Page(s):329 - 336
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (658 KB)

    A recently proposed relay servo-mechanism employs maximum torque at all times, with the sense of the torque determined by a comparison of the error and the square of the error rate. With correct switching and no friction, this system gives the minimum possible response time for a step input with the specified inertia and maximum torque. A theoretical study of the effects of Coulomb or viscous fric... View full abstract»

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  • Characteristic power requirements for performing various functions in underground coal mines

    Publication Year: 1953, Page(s):336 - 340
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB)

    Many changes in coal mining methods have been taking place during the past two decades as a result of mechanization. Electrical motor drives are now used for a great variety of functions. In order to design proper underground power transmission and distribution circuits, to select the correct size and location of transforming or converting units, and to estimate power supply needs and costs, it is... View full abstract»

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  • The effect of reactive components in the measurement of grounding circuits

    Publication Year: 1953, Page(s):340 - 345
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Knowledge concerning the electrical characteristics of the earth's surface is important in safe operation of electric equipment. Such knowledge is helpful in application of lightning protection to power systems, protection against shock hazards, and protection against premature blasting accidents where electric shot firing is used. View full abstract»

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  • Wanted: A modern diesel-electric rail car

    Publication Year: 1953, Page(s):345 - 349
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (619 KB)

    The self-propelled rail car is returning to a place of popularity as the railroads seek to reduce costs and attract additional passenger business. Current rail-car application in the United States covers relatively long main-line runs with diesel-hydraulic cars, and branch line service with light diesel-electric cars. Between these two extremes there lies a need for a main-line type of car capable... View full abstract»

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  • Technical aspects of application of electric equipment in coal preparation plants

    Publication Year: 1953, Page(s):349 - 355
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (831 KB)

    The increased cleaning required to provide coal which will meet present-day market requirements has greatly expanded the use of processing equipment in coal preparation plants. This places increased emphasis on the selection of the electric equipment to obtain the utmost in safety, reliability, and efficiency. The various phases of the electric system should be considered early in the planning sta... View full abstract»

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  • A low-height 15-ton mine locomotive for low vein haulage

    Publication Year: 1953, Page(s):355 - 357
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (451 KB)

    Mechanization has opened up new possibilities to the coal mining industry. One of these is the mining of coal seams formerly considered too narrow for practical working. Such operations impose severe restrictions on much of the equipment employed. To meet these requirements, a low-height haulage locomotive was designed with the objective of keeping vertical dimensions to a minimum. The fact that a... View full abstract»

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  • Split-pole exciters: Their design and application on diesel-electric locomotives

    Publication Year: 1953, Page(s):357 - 360
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB)

    The development of the diesel-electric locomotive posed the problem of utilizing full engine horsepower over a wide range of locomotive operating conditions. One means devised to solve this problem was the use of a split-pole exciter, so designed as to give a generator load characteristic closely matching the constant horsepower output of the diesel engine over most of its range. Since the regulat... View full abstract»

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  • A track-laying shuttle car

    Publication Year: 1953, Page(s):360 - 362
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (418 KB)

    The shuttle car was developed to meet the demand for rapid transportation of coal from the working face to the secondary haulage system in the mine. Rubber-tired cars generally have been used, but certain limitations pointed to the desirability of a track-laying vehicle. Such a car was designed, with electric drive and an electrohydraulic control system. Nearly 3 years of operating experience indi... View full abstract»

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  • The use of an analogue computer to optimize the transient response of an aircraft-type generator-regulator system

    Publication Year: 1953, Page(s):363 - 368
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (627 KB)

    In the past 5 years, a great deal of interest has been centered on the use of electronic analogue computing machines for the study of dynamic systems. The transient solution of even the simpler problems is difficult and laborious to obtain by classical mathematical methods, and for this reason analogues of these systems are being used extensively to facilitate their study and design. Since large q... View full abstract»

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Aims & Scope

This Transaction ceased production in 1963. The current retitled publication is IEEE Transactions on Industry Applications.

Full Aims & Scope